California — Personal Income Tax

California imposes personal income tax on two categories of individuals: (1) every individual who is in California for other than a temporary or transitory purpose, and (2) every individual domiciled in California who is outside the state for a temporary or transitory purpose.

Source: Cal. Rev. & Tax. Code § 17014(a)

## Resident Tax Treatment

Residents are taxed on all income from sources both inside and outside California, regardless of where the income is earned. An individual who qualifies as a resident continues to be a resident even though temporarily absent from the state.

Source: Cal. Rev. & Tax. Code § 17014(c)

Under this definition, an individual can be a California resident for tax purposes even if domiciled in another state or country, provided the individual is physically present in California for other than a temporary or transitory purpose. The determination depends on the facts and circumstances of each case, including the purpose and expected duration of the individual's presence in or absence from California.

## Nonresident Tax Treatment

Individuals who do not meet the definition of resident are nonresidents and are subject to California personal income tax only on income from California sources. Detailed sourcing rules for each category of income—compensation for services, business income, rental income, capital gains, intangible property income, retirement income, and other items—are set forth in the California-Source Income for Nonresidents section.

Source: Cal. Rev. & Tax. Code § 17041 (taxing residents on all income)

## Part-Year Residents

An individual who changes residency status during the taxable year is a part-year resident for that year. Part-year residents are taxed on (1) all income, regardless of source, for the portion of the year during which they were California residents, and (2) only California-source income for the portion of the year during which they were nonresidents. See the Part-Year Resident Taxation section for detailed rules on the dual-source regime, allocation of income between periods, and the effective tax rate methodology.

California taxes nonresidents only on income from California sources. Cal. Rev. & Tax. Code § 17951(a) provides that "for purposes of computing 'taxable income of a nonresident or part-year resident' under paragraph (1) of subdivision (i) of Section 17041, in the case of nonresident taxpayers the gross income includes only the gross income from sources within this state." The statute does not itself define what income is California-source; instead, Chapter 11 (commencing with § 17951) and implementing regulations establish specific sourcing rules by income category.

The determination of income source is a threshold question distinct from residency. A nonresident may have California-source income even if the nonresident never sets foot in California during the taxable year, provided the income arises from property located in California or business conducted in California. Conversely, a nonresident who spends time in California for personal or investment purposes may have no California-source income if the nonresident performs no services in California and owns no California real or tangible property.

## Compensation for Personal Services

General rule: source is where services are performed

The source of compensation for personal services is the location where the services are actually performed, not the location of the employer, the place of payment, or the employee's residence. Wages, salaries, bonuses, commissions, and other compensation paid to a nonresident for services performed in California are California-source income. Compensation for services performed outside California is not California-source income, even if the employer is headquartered in California or the payment originates from California.

Cal. Code Regs. tit. 18, § 17951-5 provides specific allocation methods for different categories of employees whose work straddles California and other states:

Commission-based employees (salesmen, agents)

For nonresident employees whose compensation depends on the volume of business transacted, California-source income is the proportion of total compensation that the volume of business transacted in California bears to the total volume of business transacted everywhere. Cal. Code Regs. tit. 18, § 17951-5(a)(1).

Employees paid on a time basis working in multiple states

For nonresident employees employed in California at intervals throughout the year and paid on a daily, weekly, or monthly basis (e.g., operating trains, boats, planes, motor buses, trucks between California and other states), California-source income is the proportion of total compensation that the number of working days in California bears to the total number of working days everywhere. Cal. Code Regs. tit. 18, § 17951-5(b).

Employees paid on a mileage basis

For nonresident employees paid on a mileage basis, California-source income is the proportion of total compensation that the number of miles traversed in California bears to the total number of miles traversed everywhere. Cal. Code Regs. tit. 18, § 17951-5(b).

Professional services performed in California

Nonresident attorneys, physicians, accountants, engineers, and similar professionals must include in California-source income "the entire amount of fees or compensation for services performed in this State on behalf of their clients," even if the nonresident is not regularly engaged in carrying on the profession in California. Cal. Code Regs. tit. 18, § 17951-5(a)(3). A New York attorney who travels to California for a three-day arbitration hearing and charges $50,000 for that engagement has $50,000 of California-source income, regardless of where the client is located or where the underlying dispute arose.

Performers and entertainers

Nonresident actors, singers, performers, entertainers, wrestlers, boxers, and similar individuals must include in California-source income "the gross amount received for performances in this State." Cal. Code Regs. tit. 18, § 17951-5(a)(2). The entire performance fee is California-source income if the performance takes place in California.

Equity-based compensation (stock options, restricted stock)

California sources stock option income and restricted stock income based on the period during which the services giving rise to the equity compensation were performed in California. The sourcing formula compares California work days during the vesting or service period to total work days during that period. The FTB's Residency and Sourcing Technical Manual (Rev. 01/2026) provides detailed allocation rules for nonstatutory stock options, incentive stock options, and restricted stock under IRC § 83.

## Business, Trade, or Profession Income

A nonresident engaged in a business, trade, or profession carried on in California must include in California-source income the income attributable to that California business activity. Cal. Code Regs. tit. 18, § 17951-2.

In-state business only

If the nonresident's business is carried on entirely within California, all business income is California-source income.

Multistate business (unitary)

If the nonresident carries on a unitary business both within and outside California, the business income is apportioned to California using the apportionment formula prescribed by the Uniform Division of Income for Tax Purposes Act (UDITPA), Cal. Rev. & Tax. Code §§ 25120–25139, and implementing regulations. Business income is apportioned based on a formula that considers the proportion of the taxpayer's property, payroll, and sales in California relative to total property, payroll, and sales everywhere. Cal. Code Regs. tit. 18, § 17951-4(d).

California generally uses a single-sales-factor apportionment formula for most businesses, meaning that 100% of the apportionment is based on the sales factor. The sales factor compares California sales to total sales everywhere, with sales of services and intangible property sourced based on market-based rules (where the customer receives the benefit of the service or uses the intangible property). Cal. Rev. & Tax. Code § 25136.

Partnership and S corporation income

A nonresident partner's or S corporation shareholder's distributive share of California-source income depends on whether the partnership or S corporation conducts a unitary business. If the entity conducts a unitary business both in and outside California, business income is apportioned at the entity level, and the nonresident partner or shareholder reports the apportioned California share. Nonbusiness income (e.g., rental income from California real property, capital gain from sale of California property) is sourced under the specific sourcing rules of §§ 17951–17955, not under the apportionment formula. Cal. Code Regs. tit. 18, § 17951-4(d).

## Real Property and Tangible Personal Property

Rental income

Rental income from real or tangible personal property located in California is California-source income for a nonresident, regardless of where the lease is signed, where rent is paid, or where the nonresident resides. Cal. Code Regs. tit. 18, § 17951-3.

Gains and losses from sale of real property

Gains from the sale or transfer of California real property are California-source income for a nonresident. Cal. Code Regs. tit. 18, § 17951-3; Cal. Rev. & Tax. Code § 18662 (imposing withholding on sales by nonresidents of California real property interests).

A nonresident who sells a vacation home in Lake Tahoe, California, must include the capital gain in California-source income and pay California tax on the gain, even if the nonresident lived in Nevada at the time of sale and has no other connection to California.

Gains and losses from sale of tangible personal property

Gains from the sale of tangible personal property located in California at the time of sale are generally California-source income. Cal. Code Regs. tit. 18, § 17951-3.

## Intangible Personal Property (Stocks, Bonds, Notes)

General rule: not California-source

Income from stocks, bonds, notes, or other intangible personal property (dividends, interest, capital gains) is not California-source income for a nonresident unless one of two narrow exceptions applies. Cal. Rev. & Tax. Code § 17952 provides: "income of nonresidents from stocks, bonds, notes, or other intangible personal property is not income from sources within this state unless the property has acquired a business situs in this state, except that if a nonresident buys or sells such property in this state or places orders with brokers in this state to buy or sell such property so regularly, systematically, and continuously as to constitute doing business in this state, the profit or gain derived from such activity is income from sources within this state irrespective of the situs of the property."

Exception 1: business situs in California

Intangible property acquires a "business situs" in California when it becomes an integral part of a business, trade, or profession carried on in California. The most common scenario is intangible assets (goodwill, customer lists, patents, trademarks) used in a California business. If a nonresident sells a California business and realizes gain attributable to goodwill localized in California, that gain may be California-source income under the business-situs exception.

Exception 2: trading as a California business

If a nonresident buys and sells securities in California (or places orders with California brokers) so regularly, systematically, and continuously as to constitute "doing business" in California, the trading profits are California-source income. Cal. Rev. & Tax. Code § 17952. This exception is narrow and fact-intensive; occasional trading through a California broker does not trigger it.

Investment partnership safe harbor

California provides a safe harbor for passive investment income earned by nonresidents through investment partnerships, regulated investment companies, and certain fiduciary accounts. Under Cal. Rev. & Tax. Code § 17955, dividends, interest, and gains from "qualifying investment securities" are not California-source income if the nonresident's only California contact is through a California broker, dealer, investment adviser, or corporate fiduciary, and the income is not interrelated with a California trade or business. This safe harbor protects nonresidents who invest passively through California-based investment managers.

## Retirement Income

Qualified retirement income received by a nonresident from employer-sponsored pension plans, profit-sharing plans, 401(k) plans, IRAs, Roth IRAs, SEPs, SIMPLEs, Keoghs, and similar arrangements is not California-source income, regardless of whether the income was earned while the taxpayer was a California resident or employee. Cal. Rev. & Tax. Code § 17952.5 (excluding qualified retirement income from gross income of nonresidents for taxable years beginning on or after January 1, 1996).

This exclusion applies only to retirement income received after the taxpayer becomes a nonresident. A California resident who receives a pension distribution remains subject to California tax on the distribution; a former California resident who receives the same distribution after establishing nonresident status does not.

California does not tax nonresident retirement income even if the pension or IRA is attributable to services performed in California or contributions made while the taxpayer was a California resident. The exclusion is categorical and depends solely on the recipient's nonresident status at the time of distribution.

## Trusts and Estates

A nonresident beneficiary of a California estate or trust must include in California-source income the beneficiary's distributive share of estate or trust income that is deductible by the estate or trust under California law and that is itself derived from California sources. Cal. Code Regs. tit. 18, § 17951-1(c).

The character and source of income distributed to a nonresident beneficiary is determined at the estate or trust level. If the estate or trust has California rental income, and that income is distributed to a nonresident beneficiary, the distribution retains its character as California-source rental income in the hands of the beneficiary.

Qualified retirement income distributed to a nonresident beneficiary of an estate or trust is not California-source income, consistent with the general exclusion for nonresident retirement income. Cal. Code Regs. tit. 18, § 17951-1(c).

## Community Property Income

If a nonresident is married to or in a registered domestic partnership with a California resident, and California community property law applies, the nonresident spouse or partner may have California-source income from the California resident's earnings even if the nonresident spouse or partner never worked or lived in California. Under California community property law, one-half of each spouse's or partner's earnings during the period of residence in California is community property and is allocated equally to each spouse or partner. The nonresident's community property share of the California resident's California earnings is California-source income to the nonresident.

Source: Cal. Rev. & Tax. Code § 17951 Source: Cal. Rev. & Tax. Code § 17952 Source: Cal. Rev. & Tax. Code § 17952.5 Source: Cal. Rev. & Tax. Code § 17955 Source: Cal. Rev. & Tax. Code § 18662 Source: Cal. Rev. & Tax. Code § 25136 Source: Cal. Code Regs. tit. 18, §§ 17951-1 through 17951-5 (regulation text reproduced in FTB Residency and Sourcing Technical Manual)

California imposes personal income tax using a progressive rate structure with nine brackets ranging from 1% to 12.3%, plus an additional 1% tax on taxable income exceeding $1 million.

Source: Cal. Rev. & Tax. Code § 17041

## Base Rate Structure

The base rate structure applies to residents, part-year residents (on the appropriate share of income), and nonresidents with California-source income. The brackets are adjusted annually for inflation using the California Consumer Price Index. Cal. Rev. & Tax. Code § 17041(h).

Source: Cal. Rev. & Tax. Code § 17041(h)

For the 2025 tax year (returns filed in 2026), the Franchise Tax Board publishes nine tax brackets for single filers and married/registered domestic partners filing separately, ranging from 1% on the first portion of taxable income to 12.3% on amounts exceeding approximately $721,000. Married filing jointly filers and qualifying surviving spouses use a separate schedule with the same rates but wider brackets; head-of-household filers use a third schedule.

Source: FTB 2025 California Tax Rate Schedules

The progressive structure means that each marginal rate applies only to the income within that bracket, not to all income. A taxpayer whose income places them in the 9.3% bracket pays 1% on the lowest portion, 2% on the next, and so on through the brackets.

## Mental Health Services Tax

California imposes an additional 1% tax on taxable income exceeding $1,000,000, regardless of filing status. Cal. Rev. & Tax. Code § 17043(a). This tax was enacted by voter initiative (Proposition 63) in 2004 and applies to taxable years beginning on or after January 1, 2005.

Source: Cal. Rev. & Tax. Code § 17043

The $1,000,000 threshold is not indexed for inflation and does not double for married filing jointly filers. A married couple filing jointly with combined taxable income of $1,200,000 pays the additional 1% tax on the $200,000 exceeding the threshold. The Mental Health Services Tax (also known as the Behavioral Health Services Tax) brings the top effective marginal rate to 13.3% (12.3% base rate plus 1% surtax).

Source: Cal. Rev. & Tax. Code § 17043(a)

The tax applies to the excess over $1 million of the taxpayer's taxable income as computed after all deductions and adjustments. It is calculated separately from the base tax and added to the liability before application of credits. Cal. Rev. & Tax. Code § 17043(b).

Source: Cal. Rev. & Tax. Code § 17043(b)

## Treatment of Capital Gains and Qualified Dividends

California does not provide preferential rates for long-term capital gains or qualified dividends. All capital gains—short-term and long-term—are taxed at the same ordinary income rates under the progressive bracket structure. This treatment differs materially from federal law, which applies reduced rates (0%, 15%, or 20%) to long-term capital gains and qualified dividends. Wages, business income, capital gains, and dividends are all taxed using the same nine-bracket progressive rate schedule (plus the 1% Mental Health Services Tax on taxable income exceeding $1 million).

Source: FTB Capital Gains and Losses

California residents must file a personal income tax return if their income exceeds thresholds set annually by statute and adjusted for inflation. The filing requirement is triggered when adjusted gross income or gross income surpasses specified amounts that vary by filing status (single, married/registered domestic partner, etc.). Part-year residents and nonresidents must file if they have California-source income and a resulting California tax liability. The Franchise Tax Board publishes the current-year thresholds in the annual tax booklet and instructions.

Source: Cal. Rev. & Tax. Code § 18501

California personal income tax returns for calendar-year filers are due on or before April 15 following the close of the calendar year. Fiscal-year returns are due on or before the fifteenth day of the fourth month following the close of the fiscal year. Payment of any tax owed is due on the same date as the return, even if an extension to file is granted.

Source: Cal. Rev. & Tax. Code § 18566

California allows a standard deduction in lieu of itemized deductions. For tax year 2025, the standard deduction is $5,706 for single filers and married/registered domestic partner (RDP) filing separately, and $11,412 for married/RDP filing jointly, head of household, and qualifying surviving spouse. These amounts are adjusted annually for inflation using the California Consumer Price Index.

Source: Cal. Rev. & Tax. Code § 17073.5 and FTB Standard Deduction

California provides a statutory safe harbor that allows certain individuals who remain domiciled in California to be treated as nonresidents while working outside the state under an employment-related contract. This safe harbor, codified at Cal. Rev. & Tax. Code § 17014(d), offers a definitive path to nonresident status for individuals whose circumstances otherwise create residency uncertainty.

## Requirements

An individual domiciled in California is considered "outside this state for other than a temporary or transitory purpose" — and thus a nonresident — if all of the following conditions are met:

1. Uninterrupted 546-consecutive-day absence. The individual must be outside California under an employment-related contract for an uninterrupted period of at least 546 consecutive days (approximately 18 months). The employment-related contract must be the basis for the absence; the safe harbor does not apply to passive investors, retirees living off prior wealth, or individuals whose "contract" is constructed primarily to manufacture the safe harbor. Independent contractors with bona fide outside-California service contracts can qualify if the contract is genuine, documented, and the work is actually performed outside California.

2. Limited California visits. Returns to California totaling not more than 45 days in the aggregate during any taxable year covered by the employment contract are disregarded and do not interrupt the 546-consecutive-day period. Any part of a day spent in California counts as a full day for this purpose.

3. Intangible income cap. The safe harbor does not apply if the individual has income from stocks, bonds, notes, or other intangible personal property exceeding $200,000 in any taxable year in which the employment-related contract is in effect. For married individuals, this limit applies to the combined intangible income of both spouses.

4. No tax-avoidance purpose. The safe harbor does not apply if the principal reason for the individual's absence from California is to avoid personal income tax.

Source: Cal. Rev. & Tax. Code § 17014(d)

## Scope and Exclusions

The safe harbor specifically excludes individuals domiciled in California who are required to relocate outside California as a result of receiving certain federal government elective or appointed positions. The safe harbor also extends to a spouse or registered domestic partner (RDP) if the spouse or RDP accompanies the individual outside California for at least 546 consecutive days.

The safe harbor became effective for taxable years beginning on or after January 1, 1994. Prior to that date, California domiciliaries had no statutory safe harbor and were evaluated solely on the facts-and-circumstances analysis of whether their absence was temporary or transitory.

Source: FTB Publication 1031, Guidelines for Determining Resident Status

## Practical Considerations

The 546-day safe harbor is narrow in design. It requires an actual employment-related contract — not merely a decision to work elsewhere — and it disqualifies individuals with significant passive investment income. Practitioners advising clients on California exit strategies should note that most high-net-worth individuals whose income is primarily from equity or investments will not qualify for the safe harbor and must instead rely on establishing a change of domicile and demonstrating that their presence in California (if any) is temporary or transitory under the general facts-and-circumstances test.

For individuals who do not qualify for the safe harbor, California applies a totality-of-the-circumstances analysis that examines factors including time spent in each location, the location and nature of the individual's residence, family location, business ties, professional licenses, voter registration, and other indicia of the individual's closest connections.

When the California Franchise Tax Board (FTB) proposes to assess additional personal income tax, it issues a Notice of Proposed Assessment (NPA) stating the proposed tax liability, penalties, and the basis for the proposed assessment. The NPA is the triggering document for administrative protest rights and does not create an immediate debt—no amount is currently owed until the NPA becomes final.

Statutory protest deadline

Under Cal. Rev. & Tax. Code § 19041(a), a taxpayer has 60 days after the mailing date of the NPA to file a written protest with the FTB. The protest deadline runs from the notice's mailing date, not the date the taxpayer receives it. Any protest filed on or before the "Protest By" date printed on the face of the NPA is treated as timely under § 19041(b), even if that date differs slightly from a strict 60-day calculation due to administrative rounding or weekends. If no timely protest is filed, the proposed deficiency becomes final upon expiration of the 60-day period (Cal. Rev. & Tax. Code § 19042), and the FTB will issue a Notice of Action and begin billing for the amount due, including penalties and accrued interest.

What the protest must contain

California requires a protest to be a formal written submission. The FTB's protest requirements, published in FTB Publication 7275 and codified in the agency's Manual of Audit Procedures Chapter 15, specify that a valid protest must include:

• The taxpayer's name, address, social security number or taxpayer identification number, and daytime phone number;
• The amounts and tax years being protested;
• A statement of facts;
• Points and legal authorities supporting the taxpayer's position;
• An explanation of why the taxpayer believes the assessment is incorrect;
• Evidence and documentation substantiating the position, including copies of legal authorities;
• Any portion of the proposed assessment the taxpayer concedes;
• The taxpayer's signature or the authorized representative's signature; and
• A copy of the NPA.

If representation is desired, the taxpayer must file FTB Form 3520 PIT (Power of Attorney Declaration) either with the protest or separately through the MyFTB portal.

Where and how to file

A protest may be filed online through the MyFTB portal (by the taxpayer or by an authorized representative who has registered and filed a valid power of attorney for the tax years in question), by mail to the FTB's protest processing address, or by fax. The FTB Manual of Audit Procedures confirms that for timeliness purposes, a protest must be successfully transmitted online, postmarked by the U.S. Postal Service, or received by express carrier (FedEx, UPS, etc.) on or before midnight of the 60th day after the NPA mail date.

Effect of filing a protest

Filing a timely protest suspends finalization of the assessment and entitles the taxpayer to administrative review by an FTB hearing officer. The FTB will grant an oral hearing if requested in the protest. Once the FTB completes its review, it issues a Notice of Action (NOA) that either affirms, revises, or withdraws the proposed assessment. If the taxpayer disagrees with the NOA, the taxpayer may appeal to the independent Office of Tax Appeals (OTA) within 30 days of the NOA mailing date under Cal. Rev. & Tax. Code § 19045.

Filing a protest does not stop the accrual of interest. Interest on proposed additional tax accrues from the original due date of the return. Taxpayers may make a "tax deposit" payment under Cal. Rev. & Tax. Code § 19041.5 to stop or limit interest accrual without conceding the merits of the assessment; such deposits are held in suspense and refunded (with interest) if the FTB later withdraws or reduces the proposed amount.

Source: Cal. Rev. & Tax. Code § 19041 Source: Cal. Rev. & Tax. Code § 19042 Source: FTB Publication 7275, Notice of Proposed Assessment Source: FTB Publication 4058, California Taxpayers' Bill of Rights

California personal income tax disputes follow a three-tier administrative and judicial review path: (1) protest before the Franchise Tax Board (FTB), (2) appeal to the independent Office of Tax Appeals (OTA), and (3) judicial review in superior court and appellate courts.

Step 1: FTB protest review

After a taxpayer files a timely protest against a Notice of Proposed Assessment (see Cal. Rev. & Tax. Code § 19041), the FTB assigns the case to a hearing officer. Protests are classified as either "undocketed" (handled by hearing officers in the FTB's Audit Division Protest Section) or "docketed" (referred to the FTB Legal Division). Docketed protests typically involve novel legal issues, large dollar amounts, or policy-sensitive questions. The FTB will grant an oral hearing at one of its offices if the taxpayer requests one in the protest; otherwise, the matter is resolved through written correspondence.

The FTB's hearing officer reviews the protest, examines submitted evidence, and may request additional information. Following this administrative review, the FTB issues a Notice of Action (NOA) that affirms, revises, or withdraws the proposed assessment. If the FTB's NOA affirms or partially affirms the proposed deficiency and the taxpayer disagrees, the taxpayer may appeal to the Office of Tax Appeals.

Step 2: Appeal to the Office of Tax Appeals (OTA)

The Office of Tax Appeals is an independent state agency established in 2017 to replace the elected State Board of Equalization's tax-appeal function. Under Cal. Rev. & Tax. Code § 19045, a taxpayer who disagrees with the FTB's Notice of Action may file a written appeal with the OTA within 30 days of the mailing date of the NOA. The 30-day deadline is jurisdictional; late appeals are generally dismissed unless statutory tolling applies.

The appeal may be filed electronically through the OTA Portal (OTAP), by mail, or by fax. The FTB form FTB 1037 (Request for Appeal Before the Office of Tax Appeals) is available but not mandatory; a signed letter explaining the disagreement with the FTB's determination is sufficient. The appeal should state the facts, explain why the taxpayer disagrees with the FTB's determination, and cite any legal authorities supporting the taxpayer's position. The OTA does not automatically receive documents submitted to the FTB during the protest phase—the taxpayer must resubmit all relevant documents with the appeal.

OTA proceedings

Cases are decided by a panel of three administrative law judges (ALJs) or, in the OTA's Small Case Program (for disputes under a specified dollar threshold), by a single ALJ if the taxpayer elects that option. The taxpayer and the FTB each submit briefs. The taxpayer may request an oral hearing to present witnesses and testimony; if no hearing is requested or waived, the matter is decided on the written record. The OTA issues a written decision that either sustains, modifies, or reverses the FTB's action. Either party may petition for rehearing within 30 days of the decision.

The OTA's authorizing statute is codified in Cal. Gov't Code §§ 15670–15681 (Part 9.5 of Division 3 of Title 2). The OTA's procedural rules are set forth in Cal. Code Regs. tit. 18, div. 4.1 (OTA's Rules for Tax Appeals).

Step 3: Judicial review—Superior Court and appellate courts

Either the taxpayer or the FTB may appeal an adverse OTA decision to the California Superior Court. Judicial review is de novo on the administrative record. From superior court, either party may appeal to the California Court of Appeal and, if certiorari is granted, to the California Supreme Court. In rare cases involving federal constitutional questions, further review may be sought in the U.S. Supreme Court.

Alternative route: pay-and-sue refund litigation

A taxpayer may bypass or exit the deficiency-appeal track by paying the proposed or assessed tax in full and filing a claim for refund with the FTB under Cal. Rev. & Tax. Code § 19322. If the FTB denies the claim (or fails to act within six months, resulting in a deemed denial), the taxpayer may appeal the denial to the OTA under Cal. Rev. & Tax. Code § 19324, or file suit directly in superior court under Cal. Rev. & Tax. Code § 19348. Refund litigation provides an independent path to judicial review and is sometimes preferred when the taxpayer wishes to stop interest accrual or secure a final determination without prolonged administrative proceedings.

Source: Cal. Rev. & Tax. Code § 19041 Source: Cal. Rev. & Tax. Code § 19045 Source: Cal. Gov't Code § 15670 et seq. (OTA authorizing statute) Source: Cal. Code Regs. tit. 18, div. 4.1 (OTA Rules for Tax Appeals) Source: FTB guidance on appeals

California imposes distinct statutes of limitations on the FTB's authority to assess additional personal income tax and on the taxpayer's right to file a refund claim. Both periods are four years in the general case, but California's four-year assessment period is one year longer than the federal three-year period under IRC § 6501(a), a difference that frequently surprises practitioners accustomed to federal audit timelines.

Statute of limitations on assessments (FTB's right to propose additional tax)

Under Cal. Rev. & Tax. Code § 19057(a), the FTB must mail a Notice of Proposed Assessment within four years after the return was filed, unless an exception applies. The four-year period runs from the date the return is actually filed if filed before the due date, or from the due date (including extensions) if the return is filed late.

Exceptions that extend or eliminate the assessment SOL:

• No return filed: If the taxpayer fails to file a required return, there is no statute of limitations—the FTB may assess at any time (Cal. Rev. & Tax. Code § 19087).
• False or fraudulent return: There is no statute of limitations for fraudulent returns (§ 19057(a)).
• Substantial omission of income: If the taxpayer omits from gross income an amount properly includable that exceeds 25% of the amount of gross income stated in the return, the FTB has six years to mail a notice of proposed assessment (Cal. Rev. & Tax. Code § 19059).
• Federal changes: If a taxpayer's federal tax liability is adjusted by the IRS, the taxpayer must notify the FTB within six months of the final federal determination (Cal. Rev. & Tax. Code § 18622). The FTB then has one year from the date it receives notice (or from the date it should have received notice if the taxpayer failed to report) to mail a notice of proposed assessment based on the federal change, even if the general four-year period has expired (Cal. Rev. & Tax. Code § 19059).
• Waivers: The taxpayer and FTB may agree in writing to extend the assessment period (Cal. Rev. & Tax. Code § 19067), commonly requested during ongoing audits.

The FTB's four-year period can create a gap in which California may piggyback on a federal adjustment that occurred after the federal three-year statute expired but before California's four-year statute closed.

Statute of limitations on refund claims (taxpayer's right to seek a refund)

Under Cal. Rev. & Tax. Code § 19306(a), a taxpayer must file a claim for refund within the later of:

1. Four years from the date the return was filed, if the return was timely filed (including extensions); or
2. Four years from the original due date of the return (without regard to extensions), if the return was filed late; or
3. One year from the date of overpayment, to the extent the claim relates to payments made within that one-year "look-back" window.

The look-back provision in § 19306(a)(3) allows a taxpayer who made an estimated payment or withholding remittance within one year before filing a claim to recover that payment even if the four-year period from the return filing date or due date has expired.

Strict construction and no equitable tolling

California courts construe refund claim statutes of limitations strictly. Absent a statutory exception, an untimely claim is barred "for any reason," and there is generally no reasonable-cause or equitable basis for suspending the statute (see Appeal of Benemi Partners, L.P., 2020-OTA-144P). The statute bars an untimely claim even when it is clear the tax was overpaid.

Extensions by agreement

If the taxpayer and FTB have agreed to extend the period for proposing an assessment (a "waiver" under Cal. Rev. & Tax. Code § 19067), the period for filing a refund claim is also extended to match the extended assessment period (Cal. Rev. & Tax. Code § 19308). Similarly, if the taxpayer has agreed with the IRS to extend the federal assessment period, California's refund claim period is extended correspondingly.

Bad debt and worthless security claims

In lieu of the general four-year period, claims for refund based on the deductibility of a bad debt under Cal. Rev. & Tax. Code § 24348 (or IRC § 166), or a loss from worthlessness of a security under § 24347 (or IRC § 165(g)), may be filed within seven years from the date prescribed by law for filing the return for the year with respect to which the claim is made (Cal. Rev. & Tax. Code § 19311).

Informal claims and perfection by payment

Under Cal. Rev. & Tax. Code § 19322.1, a claim for refund filed before full payment of the tax is made is treated as valid only for purposes of tolling the refund claim statute of limitations. For all other purposes—including the FTB's six-month deadline to act on the claim and the taxpayer's right to appeal or sue—the claim is deemed filed on the date full payment is made. No refund may be made for any payment made more than seven years before the date of full payment.

Source: Cal. Rev. & Tax. Code § 19057 Source: Cal. Rev. & Tax. Code § 19087 Source: Cal. Rev. & Tax. Code § 19059 Source: Cal. Rev. & Tax. Code § 19306 Source: Cal. Rev. & Tax. Code § 19311 Source: Cal. Rev. & Tax. Code § 19322.1 Source: FTB Manual of Audit Procedures, Chapter 4: Statute of Limitations & Waivers

California offers two mechanisms for taxpayers seeking certainty or relief outside the standard assessment and refund procedures: the voluntary disclosure program for unreported or underreported tax liabilities, and the private letter ruling (technical advice) process for advance determinations on prospective transactions or uncertain tax positions.

Voluntary Disclosure Agreement (VDA) Program

The California Franchise Tax Board maintains a formal Voluntary Disclosure Program for taxpayers who have failed to file required personal income tax returns or who have underreported California-source income. The program is designed to bring noncompliant taxpayers into compliance while providing limited relief from penalties and a fixed look-back period.

Eligibility

To qualify for the California VDA program, the taxpayer must initiate contact with the FTB before the FTB has contacted the taxpayer regarding the tax liability in question or commenced an audit. The taxpayer must not be under criminal investigation. Voluntary disclosure is available for individual income tax, fiduciary income tax, withholding tax, and certain other California taxes administered by the FTB, but each tax type may have distinct procedural rules.

Anonymous pre-clearance

California permits anonymous filings during the initial VDA inquiry stage. A taxpayer (or representative) may contact the FTB's Voluntary Disclosure Coordinator without disclosing the taxpayer's identity to determine preliminary eligibility. Once the FTB confirms eligibility, the taxpayer must identify themselves and file all delinquent returns and make full payment (or enter into a payment plan) to complete the agreement.

Look-back period

The standard look-back period under California's VDA program is typically four years from the date the taxpayer enters into the voluntary disclosure agreement, matching the general statute of limitations on assessments under Cal. Rev. & Tax. Code § 19057. However, the FTB retains discretion to negotiate the look-back period on a case-by-case basis, particularly where the taxpayer's noncompliance spans a longer period or involves complex nexus or sourcing issues.

Penalty waiver

Taxpayers who successfully complete a voluntary disclosure agreement receive waiver of certain penalties, including the late-filing penalty (Cal. Rev. & Tax. Code § 19131) and the late-payment penalty (Cal. Rev. & Tax. Code § 19132), but not the penalty for substantial understatement of tax (§ 19138) or fraud penalties. Interest on the unpaid tax is not waived and accrues from the original due date of each return through the date of payment.

Non-waiver of criminal liability

The VDA program is a civil compliance initiative. Entering into a voluntary disclosure agreement does not provide immunity from criminal prosecution, though criminal referrals are rare absent evidence of willful fraud.

Private Letter Rulings (Technical Advice)

The FTB issues private letter rulings (also called "technical advice memoranda" or "Chief Counsel rulings") in response to written requests from taxpayers seeking advance determinations on the tax consequences of prospective or completed transactions. Rulings are binding on the FTB with respect to the requesting taxpayer for the specific facts presented, provided the taxpayer fully and accurately disclosed all material facts.

Request procedure

A request for a private letter ruling must be submitted in writing to the FTB's Legal Division, Chief Counsel Bureau. The request must describe the facts in detail, identify the specific tax code sections at issue, present the taxpayer's analysis and proposed conclusion, and explain why the ruling is necessary. The FTB charges a user fee for processing ruling requests, typically several thousand dollars depending on the complexity of the issue.

Scope and limitations

The FTB generally will not issue rulings on:

• Purely hypothetical questions;
• Situations in which the taxpayer is under audit for the tax year in question;
• Issues that are the subject of published FTB guidance or established case law;
• Factual determinations (e.g., whether a particular individual is a California resident based on a multi-factor test); or
• Issues involving federal law where California conforms to federal treatment without modification.

Rulings are published in redacted form on the FTB's website and may be cited as precedent by other taxpayers, though they are not binding beyond the specific requesting taxpayer.

Chief Counsel legal rulings database

The FTB maintains a publicly accessible database of Chief Counsel rulings on its website. These rulings, while not controlling authority, provide insight into the FTB's interpretive positions and are frequently cited in protests, appeals, and litigation.

Unable to confirm as of 2026-05-28.

Source: FTB Voluntary Disclosure Program information Source: FTB Chief Counsel Rulings Database

California statute imposes a rebuttable presumption of residence on every individual who spends in the aggregate more than nine months of the taxable year within the state. Cal. Rev. & Tax. Code § 17016 provides: "Every individual who spends in the aggregate more than nine months of the taxable year within this State shall be presumed to be a resident. The presumption may be overcome by satisfactory evidence that the individual is in the State for a temporary or transitory purpose."

The nine months are counted in the aggregate—they need not be consecutive. Any portion of a day spent in California counts as a full day for purposes of the nine-month calculation.

## Effect of the Presumption

The nine-month threshold triggers a burden-shifting mechanism. Once the Franchise Tax Board demonstrates that an individual spent more than nine months in California during a taxable year, the individual is presumed to be a California resident for that year and subject to tax on worldwide income under Cal. Rev. & Tax. Code § 17041. That presumption, if unrebutted, supports a finding of residency.

Because FTB determinations of residency are presumptively correct, the taxpayer who has been in California for more than nine months bears the burden of producing evidence to overcome both the FTB's determination and the statutory nine-month presumption. The taxpayer must show by a preponderance of the evidence that the California presence was for a temporary or transitory purpose.

## What the Presumption Does NOT Do

The nine-month presumption operates only in one direction. Presence in California for less than nine months does not create a presumption of nonresidency. The implementing regulation, Cal. Code Regs. tit. 18, § 17016, states explicitly: "It does not follow, however, that a person is not a resident simply because he does not spend nine months of a particular taxable year in this State. On the contrary, a person may be a resident even though not in the State during any portion of the year."

An individual domiciled in California who spends only eight months physically in California during the year may still be a full-year California resident if the FTB establishes that the individual's absence was temporary or transitory. Similarly, an out-of-state domiciliary who spends seven months in California may still be found to be a California resident if the facts show the individual was in California for other than a temporary or transitory purpose, even without the benefit of the nine-month presumption.

## Evidence That Can Overcome the Presumption

The statute permits the presumption to be overcome by "satisfactory evidence that the individual is in the State for a temporary or transitory purpose." Neither the statute nor the regulation defines "satisfactory evidence," but California administrative decisions and FTB guidance illustrate the types of objective facts that may rebut the presumption.

**Leading case: Appeal of Edgar Montillion Woolley, 1951-SBE-005 (July 19, 1951)**

In Woolley, the California State Board of Equalization ruled that a taxpayer was in California for a temporary or transitory purpose even though he spent more than nine months in the state during the year. The decision turned on objective evidence: Mr. Woolley lived in a hotel on a weekly rental basis, ate all his meals out, maintained a permanent home in another state, and his departure from California was delayed by illness and a studio strike. The Board concluded that these facts demonstrated a temporary presence despite the extended duration.

Regulation on types of temporary purposes

Cal. Code Regs. tit. 18, § 17014(d)(1) provides examples of temporary or transitory purposes: "Affidavits or testimony of an individual and of his friends, employer, or business associates that the individual was in California for a rest or vacation, to complete a particular business transaction, or to work for a limited period of time will be sufficient to overcome any presumption of residence."

FTB guidance on objective factors

The FTB's Residency and Sourcing Technical Manual (revised January 2026) is not binding law but provides insight into the FTB's analytical framework. The manual states that residency determinations "cannot be based solely on the individual's subjective intent, but must instead be based on objective facts," and that "the state with which a person has the closest connection during the taxable year is the state of his residence" (quoting Cal. Code Regs. tit. 18, § 17014(b)).

The manual describes objective factors examined in residency disputes, derived from administrative decisions including Appeal of Stephen D. Bragg, 2003-SBE-002 (May 28, 2003). These factors include:

• Type of California accommodation: hotel, furnished short-term rental, or week-to-week housing, versus purchase or long-term lease of a principal residence.
• Maintenance of a permanent home elsewhere: ownership or lease of a residence outside California in the state of domicile.
• Defined purpose and expected duration: presence for a specific work assignment, business transaction, medical treatment, or contract term, supported by contemporaneous documentation (employment contract, business correspondence, medical records).
• Location of family: where spouse, registered domestic partner, and dependent children reside.
• Location of business interests: where the taxpayer maintains active business operations, professional licenses, and organizational memberships.
• Financial and transactional ties: origin of bank account and credit card transactions, vehicle registration, voter registration.
• Testimony and affidavits: statements from employer, business associates, or third parties confirming the limited, temporary nature of the California stay.

The FTB manual is guidance, not controlling authority, but it reflects the types of evidence the FTB and the Office of Tax Appeals examine when a taxpayer seeks to rebut the nine-month presumption.

## Interaction with Domicile

The nine-month presumption is most significant for individuals not domiciled in California. For such individuals, California residency under Cal. Rev. & Tax. Code § 17014(a) is established only if they are in the state "for other than a temporary or transitory purpose." The nine-month threshold provides a bright-line evidentiary presumption that the presence was not temporary or transitory, but that presumption is rebuttable by satisfactory evidence.

For individuals domiciled in California, the nine-month rule is less directly applicable because California domiciliaries are residents unless their absence from California is for other than a temporary or transitory purpose (the second clause of Cal. Rev. & Tax. Code § 17014(a)). A California domiciliary who spends only three months physically in California during the year may still be a full-year resident if the FTB establishes that the nine-month absence was temporary or transitory. California administrative decisions hold that a California domiciliary's absence is generally presumed temporary unless the individual demonstrates an absence for an indefinite period expected to last more than two years. See Appeal of William G. and Susan G. Crozier, 1992-SBE-005 (April 21, 1992).

## Burden of Proof and Documentation

A taxpayer who has spent more than nine months in California and claims nonresident status must produce contemporaneous documentation and objective evidence showing the temporary nature of the California presence. Subjective assertions of intent, standing alone, are insufficient. Effective rebuttal typically requires:

• Written documentation of the specific purpose (employment offer letter, business contract, work visa, project scope);
• Evidence of the expected limited duration (contract term, anticipated project completion date, medical prognosis);
• Proof of maintenance of a permanent residence and the bulk of personal, family, and economic ties outside California; and
• If the stay was prolonged by unforeseen events, documentation of those events (illness, project delays, force majeure).

Because the FTB's residency determination is itself presumptively correct, and the nine-month statutory presumption adds a second layer of presumed residency, individuals spending extended periods in California should maintain detailed records and contemporaneous evidence of temporary purpose from the outset of the California presence.

Source: Cal. Rev. & Tax. Code § 17016 Source: Cal. Code Regs. tit. 18, § 17016 (regulation text reproduced in FTB Residency and Sourcing Technical Manual) Source: Cal. Code Regs. tit. 18, § 17014 (regulation text reproduced in FTB Residency and Sourcing Technical Manual) Source: FTB Residency and Sourcing Technical Manual (Rev. 01/2026)

California regulation provides a safe harbor treating individuals domiciled outside California whose physical presence in the state does not exceed six months in the aggregate within a taxable year as being in California for a temporary or transitory purpose, provided they meet specified conditions. If the safe harbor applies, the individual is not a California resident for that year.

## The Regulation

Cal. Code Regs. tit. 18, § 17014(b) states: "An individual whose presence in California does not exceed an aggregate of six months within the taxable year and who is domiciled without the state and maintains a permanent abode at the place of his domicile, will be considered as being in this state for temporary or transitory purposes providing he does not engage in any activity or conduct within this State other than that of a seasonal visitor, tourist or guest."

The safe harbor has three cumulative requirements:

1. California presence does not exceed six months in the aggregate. The individual's total time physically present in California during the taxable year must not exceed six months. The regulation uses the term "aggregate," meaning the time need not be consecutive.

2. Domiciled outside California and maintains a permanent abode at the place of domicile. The individual must be domiciled in another state or country and must maintain a permanent abode (home) at that place of domicile. Cal. Code Regs. tit. 18, § 17014(c) defines domicile as "the place where an individual has his true, fixed, permanent home and principal establishment, and to which place he has, whenever he is absent, the intention of returning."

3. No activity or conduct in California other than that of a seasonal visitor, tourist, or guest. The regulation expressly permits certain activities without disqualification: "An individual may be a seasonal visitor, tourist or guest even though he owns or maintains an abode in California or has a bank account here for the purpose of paying personal expenses or joins local social clubs." Owning California real estate, maintaining a California bank account for personal expenses, and joining California social or recreational clubs do not, by themselves, disqualify the individual.

## Disqualifying Activities

The regulation does not define "seasonal visitor, tourist or guest" by enumerating all permissible or impermissible activities. The FTB's Residency and Sourcing Technical Manual (Rev. 01/2026) explains that the determination of whether an individual is in California for a temporary or transitory purpose "depends to a large extent upon the facts and circumstances of each particular case." The manual applies the general principle that residency is determined by identifying "the state with which a person has the closest connection during the taxable year."

The regulation's language—limiting the safe harbor to those who do not engage in "any activity or conduct" other than that of a visitor, tourist, or guest—has been interpreted by the FTB and in administrative decisions to exclude individuals who are employed in California, who conduct active business operations in California, or who perform services for compensation in California while present. The safe harbor is intended for individuals whose California presence is genuinely limited to personal, leisure, family, or social purposes, not for those whose California activities include income-producing work or the active conduct of a trade or business.

Because the regulation and the FTB manual do not provide an exhaustive list of disqualifying activities, individuals whose California presence includes business meetings, consulting engagements, professional services, or employment—even part-time or temporary—should evaluate whether such activities are consistent with the "seasonal visitor, tourist or guest" standard on the specific facts, recognizing that the FTB retains discretion to apply the totality-of-circumstances test.

## Interaction with Other Residency Rules

The six-month safe harbor operates independently from the nine-month presumption of Cal. Rev. & Tax. Code § 17016. An individual present in California for more than nine months in the aggregate is presumed to be a resident (rebuttable by evidence that the presence was temporary or transitory). An individual present for six months or less who is domiciled outside California and meets the visitor/tourist/guest standard is deemed to be in California for a temporary or transitory purpose under the safe harbor.

Spending less than six months in California does not automatically confer nonresident status if the individual fails to meet the other safe harbor conditions. An individual who spends only four months in California but who works for a California employer or conducts active business in California during that period may not qualify for the safe harbor and may still be found to be a California resident under the general facts-and-circumstances test of Cal. Rev. & Tax. Code § 17014(a).

Similarly, an individual who spends more than six months but less than nine months in California is neither entitled to the safe harbor nor subject to the nine-month presumption. That individual's residency is determined by the totality of facts and circumstances, including the individual's domicile, the nature and purpose of the California presence, and the individual's ties to California and to other states.

## Domicile Requirement

The safe harbor is available only to individuals domiciled outside California. An individual who remains domiciled in California cannot use the six-month safe harbor to avoid California residency by limiting time in the state to six months or less. A California domiciliary who is outside California for part of the year is a resident unless the individual's absence from California is for other than a temporary or transitory purpose (the second prong of Cal. Rev. & Tax. Code § 17014(a)). Establishing a change of domicile from California to another state is a separate, fact-intensive inquiry that cannot be accomplished solely by limiting time in California to six months.

## Burden of Proof

An individual claiming entitlement to the six-month safe harbor bears the burden of proving all three requirements. Because FTB residency determinations are presumed correct, the taxpayer must produce evidence showing: (1) the aggregate number of days present in California during the taxable year; (2) domicile in another state or country, supported by objective indicia (permanent home, voter registration, driver's license, location of family and business interests); (3) maintenance of a permanent abode at the place of domicile; and (4) that California activities were limited to those of a seasonal visitor, tourist, or guest, supported by records of employment, business operations, and income-producing activities.

The FTB's Residency and Sourcing Technical Manual notes that "residency determinations cannot be based solely on the individual's subjective intent, but must instead be based on objective facts."

Source: Cal. Code Regs. tit. 18, § 17014(b) (regulation text reproduced in FTB Residency and Sourcing Technical Manual, Rev. 01/2026) Source: Cal. Code Regs. tit. 18, § 17014(c) (regulation text reproduced in FTB Residency and Sourcing Technical Manual, Rev. 01/2026) Source: FTB Residency and Sourcing Technical Manual (Rev. 01/2026)

California imposes personal income tax on part-year residents using a dual-source regime that applies different rules depending on the individual's residency status during each portion of the taxable year. The framework is codified in Cal. Rev. & Tax. Code § 17041(i)(1), which defines "taxable income of a nonresident or part-year resident" by dividing the tax year into two distinct periods with different sourcing rules for each.

## Income Subject to Tax During Resident Period

For any part of the taxable year during which the taxpayer was a resident of California (as defined by Cal. Rev. & Tax. Code § 17014), California taxes all items of gross income and all deductions, regardless of source. Cal. Rev. & Tax. Code § 17041(i)(1)(A) states: "For any part of the taxable year during which the taxpayer was a resident of this state (as defined by Section 17014), all items of gross income and all deductions, regardless of source."

This means that worldwide income earned or received during the period of California residency is subject to California tax, including income from employment performed outside California, rental income from out-of-state property, dividends and interest from securities held anywhere in the world, capital gains from sales of property located anywhere, and business income from operations conducted outside California. The statute makes no distinction between California-source and non-California-source income during the residency period.

A part-year resident who earns $100,000 from New York employment during the portion of the year in which the individual was a California resident must include that entire $100,000 in California taxable income, subject only to the credit for taxes paid to other states under Cal. Rev. & Tax. Code § 18001 et seq.

## Income Subject to Tax During Nonresident Period

For any part of the taxable year during which the taxpayer was not a resident of California, California taxes only gross income and deductions derived from sources within California, determined in accordance with Article 9 of Chapter 3 (commencing with Cal. Rev. & Tax. Code § 17301) and Chapter 11 (commencing with § 17951). Cal. Rev. & Tax. Code § 17041(i)(1)(B) states: "For any part of the taxable year during which the taxpayer was not a resident of this state, gross income and deductions derived from sources within this state, determined in accordance with Article 9 (commencing with Section 17301) of Chapter 3 and Chapter 11 (commencing with Section 17951)."

The nonresident period is subject to the same sourcing rules that apply to full-year nonresidents. California-source income during the nonresident period includes: compensation for services performed in California (§ 17951(a)); income from a business, trade, or profession carried on in California (§ 17951(b)); income from real or tangible personal property located in California (§ 17951(c)); and capital gains from the sale of real property located in California (§ 17951(d)).

Income from stocks, bonds, notes, or other intangible personal property is generally not California-source income for a nonresident unless the property has acquired a business situs in California or the taxpayer buys and sells such property in California so regularly, systematically, and continuously as to constitute doing business in California. Cal. Rev. & Tax. Code § 17952 provides: "For purposes of computing 'taxable income of a nonresident or part-year resident' under paragraph (1) of subdivision (i) of Section 17041, income of nonresidents from stocks, bonds, notes, or other intangible personal property is not income from sources within this state unless the property has acquired a business situs in this state, except that if a nonresident buys or sells such property in this state or places orders with brokers in this state to buy or sell such property so regularly, systematically, and continuously as to constitute doing business in this state, the profit or gain derived from such activity is income from sources within this state irrespective of the situs of the property."

## Allocation of Income Between Residency and Nonresidency Periods

The allocation of income and deductions between a part-year resident's period of residency and period of nonresidency must be made in a manner that reflects the actual date of realization. FTB Legal Ruling 2003-1 states: "The allocation of income between a part-year resident's period of residency and period of non-residency must be made in a manner that reflects the actual date of realization. In the absence of information that reflects the actual date of realization, the taxpayer must allocate an annual amount on a proportional basis between the two periods, using a daily [pro rata method]."

The FTB applies the actual-realization date when facts are available. For example, wages are typically sourced to the date earned (or the period in which services are performed), not the date paid. Stock option income is sourced based on the period in which the services giving rise to the option were performed. Partnership and S corporation income is sourced based on the partnership's or S corporation's year-end, not the partner's or shareholder's year-end.

When actual realization dates cannot be determined, the FTB permits proportional allocation using a daily pro rata method. For example, if an individual was a California resident for 108 days of a 365-day year and earned dividend income that cannot be tied to a specific payment date, the FTB permits allocating (108 ÷ 365) of the dividend to the California residency period.

The FTB Ruling notes that the allocation method applies to partnership income, S corporation income, deferred compensation, and other items that are not readily assignable to a specific date. The Ruling does not mandate daily proration as the exclusive method—it permits daily proration when actual realization information is unavailable.

## Effective Tax Rate Methodology

California does not allow a part-year resident to compute tax separately on the resident-period income and the nonresident-period income using the bracketed rate tables. Instead, Cal. Rev. & Tax. Code § 17041(b)(2) and (d)(2) require part-year residents to calculate their California tax liability by multiplying their "taxable income of a nonresident or part-year resident" (as defined in subdivision (i)) by an effective tax rate.

The effective tax rate is calculated as follows:

1. Compute the tax that would be owed under the California progressive rate structure (subdivision (a) or (c), depending on filing status) on the taxpayer's entire taxable income as if the taxpayer were a California resident for the full taxable year and for all prior taxable years for any carryover items, deferred income, suspended losses, or suspended deductions;
2. Divide that hypothetical full-year-resident tax by the entire taxable income; and
3. Multiply the resulting percentage rate by the "taxable income of a nonresident or part-year resident" (the amount actually subject to California tax under subdivision (i)(1)) to determine the actual California tax due.

Cal. Rev. & Tax. Code § 17041(b)(2) provides: "The tax imposed under paragraph (1) shall be calculated by multiplying the 'taxable income of a nonresident or part-year resident,' as defined in subdivision (i), by a rate (expressed as a percentage) equal to the tax computed under subdivision (a) on the entire taxable income of the nonresident or part-year resident as if the nonresident or part-year resident were a resident of this state for the taxable year and as if the nonresident or part-year resident were a resident of this state for all prior taxable years for any carryover items, deferred income, suspended losses, or suspended deductions, divided by the amount of that income."

This effective-rate methodology ensures that part-year residents do not obtain an unintended benefit from California's progressive bracket structure by artificially compressing taxable income into a partial-year period.

## Treatment of Carryover Items, Deferred Income, Suspended Losses, and Suspended Deductions

For purposes of computing "taxable income of a nonresident or part-year resident," any carryover items, deferred income, suspended losses, or suspended deductions are includible or allowable only to the extent that the carryover item, deferred income, suspended loss, or suspended deduction was derived from sources within California.

Cal. Rev. & Tax. Code § 17041(i)(3) provides: "For purposes of computing 'taxable income of a nonresident or part-year resident' under paragraph (1), any carryover items, deferred income, suspended losses, or suspended deductions shall only be includible or allowable to the extent that the carryover item, deferred income, suspended loss, or suspended deduction was derived from sources within this state."

This means that carryover items must be traced to their geographic source. A capital loss carryforward from the sale of New York real estate cannot be used to offset California-source capital gains on a California part-year resident return, even if the loss was incurred in a year when the taxpayer was a California resident. Conversely, a net operating loss generated by a California business may be carried forward and used by a part-year resident (or a former resident who has become a full-year nonresident) only to the extent it is allocated to California sources in the carryforward year.

The statute does not specify how to allocate mixed-source carryover items; the FTB may require contemporaneous documentation or apply tracing rules on a case-by-case basis.

## Change-of-Residency Date Determination

The application of Cal. Rev. & Tax. Code § 17041(i)(1) turns on identifying the precise date on which the individual's residency status changed. California does not provide a statutory rule for assigning a specific change-of-residency date; the determination is inherently factual and must be made under the facts-and-circumstances test of § 17014.

Residency is not a day-count test. An individual does not automatically become or cease to be a California resident on the 183rd day of presence or absence. Instead, the change-of-residency date is the date on which the individual's objective facts and circumstances demonstrate that the individual either (a) entered California for other than a temporary or transitory purpose (becoming a resident), or (b) left California for other than a temporary or transitory purpose (ceasing to be a resident).

Practitioners advising part-year residents should document the change-of-residency date with objective evidence: employment start date, lease commencement, home purchase closing, family relocation, vehicle registration, voter registration, professional license application, and other contemporaneous acts consistent with a change of residence. In the absence of clear documentation, disputes over the change-of-residency date are common in FTB audits and administrative appeals.

Source: Cal. Rev. & Tax. Code § 17041(i)(1) Source: Cal. Rev. & Tax. Code § 17041(b)(2) and (d)(2) Source: Cal. Rev. & Tax. Code § 17041(i)(3) Source: Cal. Rev. & Tax. Code § 17952 Source: FTB Legal Ruling 2003-1

California provides several refundable and nonrefundable personal income tax credits designed primarily to reduce tax burdens on low- and moderate-income individuals and families. The major individual credits are the California Earned Income Tax Credit (CalEITC), Young Child Tax Credit (YCTC), Foster Youth Tax Credit (FYTC), renter's credit, and child and dependent care credit. Each credit has distinct eligibility requirements, amount calculations, and refundability rules.

## California Earned Income Tax Credit (CalEITC)

For taxable years beginning on or after January 1, 2015, California allows an earned income tax credit against "net tax" (as defined in Cal. Rev. & Tax. Code § 17039) in an amount determined in accordance with IRC § 32 (the federal EITC), subject to California-specific modifications. Cal. Rev. & Tax. Code § 17052(a)(1). The California credit amount is calculated by multiplying the federal EITC amount (as computed under IRC § 32, with California modifications) by an "earned income tax credit adjustment factor" specified annually in the state Budget Act. Unless otherwise specified in the annual Budget Act, the adjustment factor for taxable years beginning on or after January 1, 2015 is 0 percent. Cal. Rev. & Tax. Code § 17052(a)(2)(B).

California's CalEITC differs from the federal credit in several respects. Most significantly, California extends eligibility to taxpayers and qualifying children who have either a Social Security number or an Individual Taxpayer Identification Number (ITIN), thereby including undocumented taxpayers who are ineligible for the federal credit. Cal. Rev. & Tax. Code § 17052(c)(2)(A). California also uses modified income thresholds, phase-out ranges, and imposes a minimum credit floor for certain low-income taxpayers.

The credit is fully refundable under Cal. Rev. & Tax. Code § 17052(k)(1)—if the credit exceeds the taxpayer's net tax, the excess is refunded to the taxpayer upon appropriation by the Legislature. The FTB publishes current-year maximum credit amounts, income limits, and phase-out thresholds annually; for tax year 2025, the FTB reports a maximum CalEITC of $3,756 for eligible working families and individuals earning up to $32,900 per year.

Source: Cal. Rev. & Tax. Code § 17052 Source: FTB California Earned Income Tax Credit Information

## Young Child Tax Credit (YCTC)

For taxable years beginning on or after January 1, 2019, California allows a refundable young child tax credit to a "qualified taxpayer"—an individual or married couple/registered domestic partners who is allowed the CalEITC and has a "qualifying child" under age 6 at the end of the taxable year. Cal. Rev. & Tax. Code § 17052.1(a), (c).

The base YCTC amount is $1,176, multiplied by the earned income tax credit adjustment factor used for the CalEITC (as specified in Cal. Rev. & Tax. Code § 17052(a)(2)). The amount is indexed annually for inflation in the same manner as the income tax brackets under Cal. Rev. & Tax. Code § 17041(h). Cal. Rev. & Tax. Code § 17052.1(a)(2). The credit is available on a per-qualifying-child basis—a taxpayer with two qualifying children under age 6 may claim the credit for each child, subject to the phase-out.

The YCTC phases out: the credit is reduced by $20 for each $100 (or fraction thereof) by which the qualified taxpayer's earned income exceeds the threshold amount that produces the maximum CalEITC for the taxable year under Cal. Rev. & Tax. Code § 17052(a). Cal. Rev. & Tax. Code § 17052.1(a)(2)(C). The credit is fully refundable under § 17052.1(d)—excess amounts are refunded to the taxpayer upon appropriation by the Legislature. The credit is claimed on FTB Form 3514.

Source: Cal. Rev. & Tax. Code § 17052.1

## Foster Youth Tax Credit (FYTC)

For taxable years beginning on or after January 1, 2022, California allows a refundable foster youth tax credit to a "qualified taxpayer" who: (1) was in foster care while age 13 or older and placed through the California foster care system; (2) is age 18 or older but not more than 25 on the last day of the taxable year; (3) is allowed the CalEITC for the taxable year; and (4) satisfies verification requirements established by the FTB. Cal. Rev. & Tax. Code § 17052.2(a), (c).

The base FYTC amount is $1,176, multiplied by the earned income tax credit adjustment factor used for the CalEITC, and indexed annually for inflation in the same manner as the income tax brackets. Cal. Rev. & Tax. Code § 17052.2(a)(2). The credit phases out using the same income thresholds and phase-out structure as the YCTC: the credit is reduced by $20 for each $100 (or fraction thereof) by which the taxpayer's earned income exceeds the threshold amount that produces the maximum CalEITC. Cal. Rev. & Tax. Code § 17052.2(a)(2)(C).

The FYTC is fully refundable under § 17052.2(e). The credit is claimed per eligible individual—if both spouses or registered domestic partners on a joint return qualify for the credit, each may claim the credit separately. Cal. Rev. & Tax. Code § 17052.2(f). Eligibility extends to individuals who have an ITIN rather than a Social Security number. The credit is claimed on FTB Form 3514.

The FYTC is operative only for taxable years for which resources are authorized in the annual Budget Act for the FTB to oversee and audit returns associated with the CalEITC. Cal. Rev. & Tax. Code § 17052.2(b).

Source: Cal. Rev. & Tax. Code § 17052.2

## Renter's Credit

California allows a credit for "qualified renters"—individuals who: (1) were California residents (as defined in Cal. Rev. & Tax. Code § 17014) for the taxable year; and (2) rented and occupied premises in California which constituted the individual's principal place of residence during at least 50 percent of the taxable year. Cal. Rev. & Tax. Code § 17053.5(c).

The credit amount is $120 for spouses filing joint returns, heads of household, and surviving spouses (as defined in Cal. Rev. & Tax. Code § 17046) if adjusted gross income (AGI) is $50,000 or less, and $60 for other individuals if AGI is $25,000 or less. These AGI thresholds are adjusted annually for inflation. Cal. Rev. & Tax. Code § 17053.5(a)(1), (j). Spouses receive only one credit per return, except when each spouse maintained a separate residence for the entire taxable year. Cal. Rev. & Tax. Code § 17053.5(a)(2), (b).

A "qualified renter" excludes: (1) individuals who for more than 50 percent of the taxable year rented premises that were exempt from property taxes (unless the individual or landlord pays possessory interest taxes or makes in-lieu payments substantially equivalent to property taxes); (2) individuals whose principal place of residence was with another person who claimed the individual as a dependent; and (3) individuals who were granted (or whose spouse was granted) the homeowners' property tax exemption during the taxable year. Cal. Rev. & Tax. Code § 17053.5(d).

The renter's credit is nonrefundable—it may reduce net tax to zero but does not generate a refund under the general rule. Cal. Rev. & Tax. Code § 17053.5(k). However, for taxable years in which expanded credit amounts are operative (subject to legislative appropriation), the renter's credit may become refundable. Cal. Rev. & Tax. Code § 17053.5(l), (m).

Source: Cal. Rev. & Tax. Code § 17053.5

## Child and Dependent Care Credit

California allows a credit for qualified child and dependent care expenses under Cal. Rev. & Tax. Code § 17052.6, in partial conformity with IRC § 21 (the federal child and dependent care credit). The California credit is calculated as a percentage of the allowable federal credit amount, with the percentage varying by the taxpayer's AGI.

For taxpayers with AGI of $40,000 or less, the California credit is 50% of the allowable federal credit. The percentage decreases as AGI increases, phasing down to zero for taxpayers with AGI exceeding $100,000. Cal. Rev. & Tax. Code § 17052.6(c). The credit is nonrefundable—it may not exceed the taxpayer's net tax. Cal. Rev. & Tax. Code § 17052.6(e).

California does not fully conform to federal treatment of all expense categories. Practitioners should confirm whether specific expenses qualify under California law, particularly for care provided outside the home or by relatives.

Source: Cal. Rev. & Tax. Code § 17052.6

## Refundability and Application Against Net Tax

The CalEITC, YCTC, and FYTC are fully refundable—if the credit exceeds the taxpayer's net tax, the excess is paid to the taxpayer from the Tax Relief and Refund Account, upon appropriation by the Legislature. The renter's credit and child and dependent care credit are nonrefundable (subject to legislative exceptions for the renter's credit in certain years).

Credits are applied against "net tax" as defined in Cal. Rev. & Tax. Code § 17039, which is the tax computed under Cal. Rev. & Tax. Code § 17041 (including the 1% Mental Health Services Tax imposed under § 17043 on taxable income exceeding $1 million) minus certain other credits, but before application of withholding and estimated payments.

For part-year residents and nonresidents, the refundable credits (CalEITC, YCTC, FYTC) are subject to proration or limitation based on the ratio of California-source income to total income. The renter's credit requires California residency and a California principal residence for at least 50% of the taxable year, as specified in Cal. Rev. & Tax. Code § 17053.5(c).

## Claiming the Credits and Statute of Limitations

The CalEITC, YCTC, and FYTC are claimed on FTB Form 3514 (California Earned Income Tax Credit). The renter's credit is claimed directly on the taxpayer's Form 540 or 540NR. The child and dependent care credit is claimed on FTB Schedule P (Alternative Minimum Tax and Credit Limitations).

Taxpayers may amend prior-year returns to claim the CalEITC for up to four prior years, subject to the general statute of limitations on refund claims under Cal. Rev. & Tax. Code § 19306. The FTB has indicated that the CalEITC, YCTC, and FYTC may generally be claimed for prior years by filing or amending returns within the applicable statute of limitations.

Source: FTB California Earned Income Tax Credit Information

California requires individuals to pay estimated tax throughout the year if they expect to owe at least $500 in tax after subtracting withholding and credits ($250 for married individuals or registered domestic partners filing separately). Estimated tax is paid in four quarterly installments on a schedule that differs from the federal quarterly schedule. Underpayment of any installment triggers an interest-based penalty unless the taxpayer satisfies one of the statutory safe harbors.

## Filing Requirement Threshold

An individual must make estimated tax payments if the tax imposed under Cal. Rev. & Tax. Code § 17041 (personal income tax) or § 17048 (tax on lump-sum distributions) and the tax imposed under § 17062 (alternative minimum tax), minus the sum of any credits against the tax provided by Part 10 (commencing with § 17001) or Part 10.2, is at least $500. For a separate return filed by a married person or registered domestic partner, the threshold is $250. Cal. Rev. & Tax. Code § 19136(g)(2).

The threshold is applied on the basis of either (1) the prior year's tax, or (2) the estimated tax for the current year. If either amount (less credits, but before withholding) is less than $500 ($250 for married filing separately), no estimated tax payment is required and no underpayment penalty is imposed.

This threshold differs from the federal rule under IRC § 6654(e)(1), which provides a de minimis exception if the tax shown on the return is less than $1,000. California does not incorporate the federal $1,000 exception. Cal. Rev. & Tax. Code § 19136(c)(1) explicitly provides that "Section 6654(e)(1) of the Internal Revenue Code, relating to exceptions where the tax is a small amount, does not apply."

## Quarterly Due Dates and Payment Percentages (30/40/0/30 Schedule)

California uses a 30/40/0/30 installment schedule that differs from the federal 25/25/25/25 schedule. For taxable years beginning on or after January 1, 2010, the required installment percentages are:

• 1st installment (April 15): 30% of the required annual payment
• 2nd installment (June 15): 40% of the required annual payment
• 3rd installment (September 15): 0% of the required annual payment
• 4th installment (January 15 of the following year): 30% of the required annual payment

Cal. Rev. & Tax. Code § 19136.1(a)(2).

These percentages apply to the "required annual payment," which is generally the lesser of (1) 90% of the tax shown on the current year's return, or (2) 100% of the tax shown on the prior year's return (110% for high-income taxpayers, as described below). The percentages are cumulative, meaning that by the June 15 due date, the taxpayer must have paid 70% (30% + 40%) of the required annual payment; by September 15, 70%; and by January 15, 100%.

If a due date falls on a Saturday, Sunday, or legal holiday, the due date is the next business day. Cal. Rev. & Tax. Code § 19136 incorporates by reference IRC § 6654, which in turn incorporates IRC § 7503 (time for performance when last day falls on weekend or holiday).

Fiscal-year filers make payments on the 15th day of the 4th, 6th, and 9th months of the fiscal year, and the 1st month of the following fiscal year, using the same 30/40/0/30 percentage schedule.

California's three-installment schedule (zero payment due in September) front-loads estimated payments compared to the federal schedule. Practitioners must advise clients that paying only federal estimated taxes according to the federal schedule will result in California underpayment penalties even if the taxpayer pays the full annual California liability by year-end.

## Safe Harbors to Avoid Underpayment Penalty

California incorporates by reference IRC § 6654(d), which provides two principal safe harbors. A taxpayer who satisfies either safe harbor for all four installment periods will not be subject to the underpayment penalty, even if the taxpayer owes additional tax when the return is filed.

Safe Harbor 1: Current-Year Safe Harbor (90% Rule)

Pay at least 90% of the tax shown on the current year's return through a combination of withholding and estimated payments. Cal. Rev. & Tax. Code § 19136(a) incorporates IRC § 6654(d)(1)(B)(i). This safe harbor requires accurate income projection but avoids overpayment if the taxpayer's estimates are correct.

Safe Harbor 2: Prior-Year Safe Harbor (100%/110% Rule)

Pay at least 100% of the tax shown on the prior year's return if the taxpayer filed a return for the prior year covering a full 12-month period. IRC § 6654(d)(1)(B)(ii), incorporated by Cal. Rev. & Tax. Code § 19136(a).

For high-income taxpayers, the prior-year safe harbor requires payment of 110% of the prior year's tax if the taxpayer's prior year adjusted gross income (AGI) exceeded $150,000 ($75,000 for married individuals or registered domestic partners filing separately). IRC § 6654(d)(1)(C), incorporated by Cal. Rev. & Tax. Code § 19136(a).

California adopts the federal safe harbor thresholds without modification. The 110% rule applies to California AGI (as computed under Cal. Rev. & Tax. Code § 17072) in the same manner as federal AGI under the federal rule.

## Penalty for Underpayment of Estimated Tax

If a taxpayer fails to pay a required installment by its due date, or pays less than the required amount, California imposes an interest-based penalty on the underpaid amount for the period from the installment due date until the earlier of (1) the date the installment is paid, or (2) the due date of the annual return. Cal. Rev. & Tax. Code § 19136(a) incorporates IRC § 6654(a).

The penalty is not a flat percentage. It is calculated using the interest rate determined under Cal. Rev. & Tax. Code § 19521, which is the federal short-term rate plus 3 percentage points, set quarterly and compounded daily. Cal. Rev. & Tax. Code § 19136(b) modifies IRC § 6654(a)(1) to substitute the California interest rate for the federal rate under IRC § 6621.

The penalty is computed separately for each installment period. If the first installment is underpaid but the second installment is overpaid, the overpayment is credited against the underpayment to reduce or eliminate the penalty for the earlier period, but only to the extent permitted under the regulations. The penalty calculation is performed on FTB Form 5805, Underpayment of Estimated Tax by Individuals and Fiduciaries.

Because the penalty is interest-based rather than a fixed percentage penalty, the amount owed depends on the size of the underpayment, the length of the underpayment period, and the applicable quarterly interest rate. Taxpayers cannot avoid the penalty by paying the shortfall with the annual return—the penalty accrues from the missed installment date through the return due date.

## Withholding Treated as Paid in Installments (30/40/0/30 Allocation)

California tax withheld on wages (under Cal. Rev. & Tax. Code § 18662) and other withholding is treated as paid in estimated tax installments for purposes of computing the underpayment penalty. Unlike the federal rule, which treats withholding as paid in equal parts on each installment due date, California allocates withholding in the same 30/40/0/30 proportions as the required installment schedule. Cal. Rev. & Tax. Code § 19136(e)(2) modifies IRC § 6654(g)(1) to substitute "the applicable percentage" (30%, 40%, 0%, 30%) for the federal "equal part" rule.

This modification means that a taxpayer who has substantial California withholding but who makes no actual estimated payments is deemed to have paid 30% by April 15, 70% by June 15, 70% by September 15, and 100% by January 15. The allocation is automatic—the taxpayer does not elect or control it.

Practitioners should note that the California allocation rule differs materially from the federal rule and can affect underpayment penalty calculations for clients with irregular estimated payment patterns but steady withholding.

## Special Rules and Exceptions

Farmers and fishermen: If at least two-thirds of the taxpayer's gross income for the current or prior year is from farming or fishing, the taxpayer may pay all estimated tax by January 15 of the following year, or file the return and pay all tax by March 1, avoiding estimated payments entirely. Cal. Rev. & Tax. Code § 19136(a) incorporates IRC § 6654(i).

Annualized income installment method: Taxpayers who receive income unevenly during the year may use the annualized income installment method to match estimated payments to the periods when income is earned, potentially reducing or eliminating underpayment penalties. This method is calculated on FTB Form 5805 using an annualization schedule. Cal. Rev. & Tax. Code § 19136(a) incorporates IRC § 6654(d)(2).

Filing early return in lieu of fourth installment: If the taxpayer files the California return and pays the entire balance due by January 31 (one month before the regular April 15 due date), the taxpayer is not required to make the fourth estimated payment due January 15, and no penalty is imposed for that installment. This exception is provided in the FTB instructions for Form 540-ES and is consistent with the federal rule under IRC § 6654(h).

Nonresidents and part-year residents: The estimated tax requirements apply to nonresident individuals. Cal. Rev. & Tax. Code § 19136(f). A nonresident must make estimated payments if the tax on California-source income meets the $500 threshold ($250 for married filing separately).

No penalty for new-law underpayments: No penalty is imposed to the extent the underpayment was created or increased by any law that is chaptered during and operative for the taxable year of the underpayment. Cal. Rev. & Tax. Code § 19136(g)(1)(A). This provision protects taxpayers from penalties attributable to mid-year tax law changes that could not reasonably have been anticipated when making estimated payments.

Source: Cal. Rev. & Tax. Code § 19136 Source: Cal. Rev. & Tax. Code § 19136.1 Source: FTB Instructions for Form 540-ES, Estimated Tax for Individuals (2025) Source: FTB Estimated Tax Payments Information