Iowa — Personal Income Tax

Iowa imposes a personal income tax on every resident and nonresident of the state. The tax is levied, collected, and paid annually on the entire taxable income as defined in Iowa Code chapter 422, subchapter II. For tax years beginning on or after January 1, 2025, the tax rate is a flat 3.8 percent applied to all taxable income.

Residents are taxed on their entire taxable income from all sources. Nonresidents and part-year residents are taxed on their Iowa-source income, computed by applying the standard tax rate to total taxable income, reducing by nonrefundable credits, and then multiplying by a fraction: Iowa net income divided by total net income. Estates and trusts are also subject to the tax.

Low-income exemptions apply. Residents and nonresidents with net income of $13,500 or less (married filing jointly, heads of household, surviving spouses) or $9,000 or less (other filers) are generally exempt. Higher thresholds apply to taxpayers age 65 or older: $32,000 (joint/head of household/surviving spouse) or $24,000 (other filers). Nonresidents and part-year residents with Iowa-source net income under $1,000 are also exempt.

Source: Iowa Code § 422.5

Iowa personal income tax returns are due April 30 following the tax year. If that date falls on a Saturday, Sunday, or state holiday, the deadline moves to the next business day. Iowa grants an automatic extension to October 31 without requiring a separate extension form, provided at least 90% of the tax is paid by April 30. If less than 90% is paid by the original due date, penalties and interest apply. No extension form is required.

Source: Iowa Dept. of Revenue – Individual Income FAQs

For tax years beginning on or after January 1, 2023, Iowa excludes from taxable income all qualifying retirement income received by taxpayers who are age 55 or older, disabled, a surviving spouse, or a survivor with an insurable interest in a qualifying individual. Qualifying retirement income includes distributions from governmental or private pension and retirement plans, including defined benefit and defined contribution plans, annuities, individual retirement accounts, employer-maintained plans, self-employed plans, and deferred compensation plans.

This full exclusion replaced Iowa's prior partial exclusion, which capped the deduction at $6,000 for individuals and $12,000 for joint filers. The exclusion is in addition to Iowa's separate exclusion for military retirement pay.

Source: Iowa Code § 422.7(19); Iowa Dept. of Revenue – Retirement Income Tax Guidance

For tax years beginning on or after January 1, 2025, Iowa no longer maintains a separate state standard deduction. Instead, Iowa taxpayers use the same standard deduction or itemized deduction amount claimed on their federal Form 1040. If a taxpayer claims the federal standard deduction, Iowa uses that amount; if a taxpayer itemizes federally, Iowa requires the same itemized deductions. Iowa taxpayers must use the same deduction method—standard or itemized—on both their federal and Iowa returns.

Source: Iowa Dept. of Revenue – IA 1040 Instructions, Line 01

For tax years beginning on or after January 1, 2025, Iowa imposes a flat personal income tax rate of 3.8 percent on all taxable income. The rate applies uniformly regardless of income level or filing status. This flat structure replaced Iowa's former graduated bracket system under repealed Iowa Code § 422.5A, which imposed rates ranging from 0.33 percent to 8.53 percent. Senate File 2442, enacted in May 2024, accelerated the flat-tax transition from the originally planned 2026 effective date and reduced the rate from the originally planned 3.9 percent to 3.8 percent.

Source: Iowa Code § 422.5; Iowa Dept. of Revenue – 2026 Individual Income Tax and Interest Rates

Iowa taxes nonresidents only on income derived from sources within the state. The sourcing rules determine which types of income connect to Iowa and must be reported by nonresident taxpayers on their Iowa returns.

Wage and salary income

Compensation for personal services is sourced to Iowa based on where the services are physically performed. Wages, salaries, commissions, and fees paid to a nonresident are subject to Iowa tax only to the extent the services are rendered within Iowa's borders. A nonresident employee who performs services entirely outside Iowa owes no Iowa tax on that compensation, even if the employer is located in Iowa or has an Iowa office. Conversely, a nonresident who performs any services—part-time or full-time—within Iowa must include the compensation for those Iowa-performed services in Iowa taxable income.

When a nonresident employee performs services both inside and outside Iowa, the portion of total compensation allocable to Iowa is determined by the ratio of days worked in Iowa to total days worked, or by another reasonable apportionment method if the day-count method does not fairly reflect Iowa-source income.

Business, trade, profession, or occupation income

Income from a business, trade, profession, or occupation carried on within Iowa is sourced to Iowa. If the business is conducted partly within and partly without Iowa, only the portion of net income fairly and equitably attributable to the Iowa portion of the activity is allocated to Iowa. The entire amount of such income—both within and without Iowa—must be shown on the nonresident's return, with the Iowa portion separately computed.

For apportionment purposes, Iowa regulations provide that net income from a multistate business must be allocated to Iowa on a fair and equitable basis using approved accounting methods. For businesses selling tangible personal property, gross sales are sourced to Iowa if the property is delivered or shipped to a purchaser within the state.

Income from intangible property

Interest, dividends, and other income from intangible personal property (such as bank accounts, stocks, bonds, and investment securities) are generally not sourced to Iowa when received by a nonresident, even if the financial institution or issuing corporation is located in Iowa. This rule applies unless the intangible income is derived from a business, trade, profession, or occupation that the nonresident carries on within Iowa. For example, interest earned by a nonresident on a personal savings account at an Iowa bank is not Iowa-source income. But interest earned on a checking account used by a nonresident to operate a business in Iowa is Iowa-source income because it is derived from the Iowa business.

Real and tangible personal property

Rents and royalties from real property or tangible personal property located in Iowa are Iowa-source income for nonresidents. Gains from the sale of Iowa-situs real property or tangible personal property are also sourced to Iowa, even if the sale is consummated outside the state, provided the property was sold before subsequent use outside Iowa.

Income from pass-through entities

A nonresident partner's, shareholder's, or beneficiary's distributive share of income from a pass-through entity (partnership, S corporation, estate, or trust) is sourced to Iowa to the extent the entity's income is derived from Iowa sources, applying the same sourcing principles described above. If a partnership conducts business both in and out of Iowa, the nonresident partner's distributive share is allocated in and out of Iowa based on the partnership's Iowa versus total activities.

Income received from a trust or estate is Iowa-source income for a nonresident beneficiary if the income is derived from Iowa sources, regardless of where the trust or estate is administered or the residency of the fiduciary.

Retirement income exclusion for nonresidents

Iowa Code § 422.8(2)(b) provides that distributions from pensions, annuities, individual retirement accounts, and deferred compensation plans received by a nonresident are not considered Iowa-source income, even if the distributions are attributable to services the individual performed in Iowa during employment. This rule applies so long as the distribution is directly related to the individual's documented retirement and received while the individual is a nonresident of Iowa. This exclusion is separate from Iowa's broader retirement income exclusion for residents age 55 and older.

Source: Iowa Code § 422.8; Iowa Admin. Code r. 701-302.16

Iowa does not allow nonresidents to claim a credit for income taxes paid to other states on the same income that Iowa taxes. The out-of-state tax credit authorized by Iowa Code § 422.8(1)(a) is available only to Iowa residents and part-year residents (for the portion of the year they were Iowa residents). Nonresidents are explicitly excluded from claiming the credit.

Why nonresidents do not receive the credit

Iowa's allocation method for nonresidents inherently prevents double taxation, eliminating the need for a credit. Nonresidents pay Iowa tax only on their Iowa-source income, calculated by applying the standard 3.8 percent rate to their total taxable income, then multiplying the result by a fraction: Iowa net income divided by total net income. Because Iowa taxes only the Iowa-source portion of a nonresident's income, and the nonresident's state of residence typically does not tax that Iowa-source income (or allows its own resident credit), the same income is generally not subject to full tax in both states.

For example, a Nebraska resident who works in Iowa and earns $60,000 in Iowa wages plus $40,000 in Nebraska wages (total $100,000) computes Iowa tax on the full $100,000, then multiplies the result by the fraction $60,000 / $100,000 = 60 percent. The final Iowa tax liability reflects only the Iowa-source wages. Nebraska, as the state of residence, will tax the full $100,000 but will typically allow a resident credit for the Iowa tax paid on the Iowa-source income. Iowa does not provide a reciprocal nonresident credit because the allocation method already limits Iowa's tax to Iowa-source income.

Iowa residents' credit

By contrast, Iowa residents are taxed on their worldwide income and are allowed a credit for income taxes paid to other states or foreign countries on income derived from sources outside Iowa. The credit is limited to the lesser of (1) the tax paid to the other jurisdiction, or (2) the Iowa tax on the same income. Residents claim the credit on Schedule IA 130. Part-year residents may claim the credit only for taxes paid to another jurisdiction on income earned outside Iowa during the portion of the year they were Iowa residents.

Regulatory and administrative guidance

Iowa Admin. Code r. 701-42.4(1) confirms that the out-of-state tax credit "is allowable only if the taxpayer files an Iowa resident income tax return." The Iowa Department of Revenue's official instructions for the out-of-state tax credit state: "Nonresidents of Iowa may NOT claim this credit." Iowa Admin. Code r. 701-304.7(1) similarly provides that "taxpayers who were nonresidents of Iowa for the entire tax year are not eligible for an out-of-state tax credit on their Iowa returns."

Source: Iowa Code § 422.8; Iowa Admin. Code r. 701-42.4; Iowa Dept. of Revenue – Out-of-State Tax Credit Instructions

The low-income exemption thresholds in Iowa Code § 422.5 are fixed statutory amounts and are not indexed for inflation as of tax years beginning on or after January 1, 2025. The current thresholds—$13,500 for married filing jointly, heads of household, and surviving spouses; $9,000 for other filers; $32,000 for age-65-or-older joint/head-of-household/surviving-spouse filers; and $24,000 for age-65-or-older other filers—will remain at these dollar amounts unless the Iowa legislature enacts a statute changing them.

Repeal of inflation adjustment mechanism

Prior to 2025, Iowa Code § 422.5, subsection 6 directed the Iowa Department of Revenue director to multiply dollar amounts set forth in section 422.5 by the cumulative inflation factor determined under Iowa Code § 422.4, round the result to the nearest dollar, and incorporate the indexed amounts into income tax forms and instructions for each tax year. This inflation-adjustment mechanism applied to the tax-bracket thresholds under Iowa's former graduated-rate structure and to certain other dollar amounts in section 422.5.

Senate File 2442, enacted in 2024, struck subsection 6 in its entirety, effective for tax years beginning on or after January 1, 2025. The same legislation replaced Iowa's graduated income tax rates with a single flat rate of 3.8 percent, eliminating the need to index bracket thresholds. The repeal of subsection 6 ended inflation indexing for all dollar amounts in section 422.5, including the low-income exemption thresholds in subsections 2 and 3.

Thresholds remain at 2024 levels

Because the inflation-adjustment directive in subsection 6 was deleted, the low-income exemption thresholds are now frozen at the amounts stated in the statute:

• Universal low-income exemption (Iowa Code § 422.5(2)): $13,500 for married filing jointly, heads of household, and surviving spouses; $9,000 for single filers and married filing separately.
• Age-65-or-older low-income exemption (Iowa Code § 422.5(3)): $32,000 for married filing jointly, heads of household, and surviving spouses; $24,000 for single filers and married filing separately.

These thresholds will not automatically increase in future years to reflect inflation. Any future change to the dollar amounts would require new legislation.

Interaction with Iowa Code § 422.21, subsection 5

Iowa Code § 422.21, subsection 5 still directs the director to determine annual and cumulative inflation factors for tax years beginning on or after January 1, 2023, and to "compute the new dollar amounts as specified to be adjusted in section 422.5 by the latest cumulative inflation factor." However, because section 422.5, subsection 6—the provision that specified which dollar amounts in section 422.5 were to be adjusted—has been struck, there are no longer any dollar amounts in section 422.5 designated for inflation adjustment. The director does not adjust the low-income exemption thresholds.

Source: Iowa Code § 422.5; Iowa Code § 422.21; 2024 Iowa Acts, ch. 1094 (Senate File 2442)

Iowa taxpayers must make quarterly estimated income tax payments if their Iowa income tax liability attributable to income not subject to withholding can reasonably be expected to reach a specified dollar threshold for the tax year. The threshold amount and the payment mechanics are set by Iowa Code § 422.16 and Iowa Administrative Code chapter 308.

Dollar threshold triggering the requirement

For tax years beginning before January 1, 2026, a person or married couple filing a return must make estimated tax payments if their Iowa income tax attributable to income other than wages subject to withholding can reasonably be expected to amount to $200 or more for the taxable year. For tax years beginning on or after January 1, 2026, the threshold increases to $1,000 or more. The 2026 increase was enacted by 2024 Iowa Acts, chapter 1094 (Senate File 2442), the same legislation that implemented Iowa's 3.8 percent flat income tax rate.

Taxpayers who receive income subject to Iowa withholding (such as W-2 wages) generally do not need to make estimated payments on that withheld income. The requirement applies to income not subject to withholding, such as self-employment income, interest, dividends, capital gains, rents, royalties, business income, farm income, trust distributions, and certain pension or retirement income not subject to voluntary withholding. Nonresidents who earn Iowa-source income not subject to withholding are also required to make estimated payments if the threshold is met.

Quarterly payment due dates

Estimated tax is paid in four quarterly installments. For calendar-year taxpayers, the installment due dates are:

• First installment: April 30
• Second installment: June 30
• Third installment: September 30
• Fourth installment: January 31 of the following year

For fiscal-year taxpayers, the installment dates are the last day of the fourth month, the last day of the sixth month, the last day of the ninth month, and the last day of the first month of the next fiscal year. If any due date falls on a Saturday, Sunday, or state holiday as defined in Iowa Code § 421.9A, the deadline moves to the next day that is not a Saturday, Sunday, or holiday.

Taxpayers may pay the entire estimated tax in one payment on or before the first installment due date, or may elect to pay any installment prior to its prescribed due date.

Safe-harbor provisions to avoid underpayment penalties

Iowa imposes a penalty for underpayment of estimated tax, calculated on Form IA 2210 for individual taxpayers (or Form IA 2210F for farmers and fishers). The penalty is computed as a per-day interest charge based on the number of days an estimated payment is late. Taxpayers may avoid the penalty by satisfying one of the following safe harbors:

1. Prior-year safe harbor: Current-year estimated tax payments, made on or before the quarterly due dates, are equal to or exceed the prior year's total tax liability. The prior year must have covered a 12-month period. High-income taxpayers must meet a higher threshold: if the taxpayer's federal adjusted gross income for the prior year exceeded $150,000 ($75,000 for married taxpayers filing separate federal returns), the taxpayer must pay 110 percent (or another percentage specified in the IA 1040ES instructions for the applicable tax year) of the prior year's tax liability to qualify for this safe harbor.

1. Current-year safe harbor: Current-year estimated tax payments, made on or before the quarterly due dates, are at least 90 percent of the tax on the current year's annualized taxable income, as determined on Form IA 2210.

Underpayment of estimated tax is determined in the same manner as provided under the Internal Revenue Code, and the exceptions in the Internal Revenue Code (such as the special rules for farmers and fishers) also apply for Iowa purposes. The penalty may be waived in cases of casualty, disaster, or other unusual circumstances, or if the underpayment was due to reasonable cause and not willful neglect.

Special rules for farmers and fishers

If at least two-thirds of a taxpayer's estimated gross income for the tax year is from farming or fishing, the taxpayer may satisfy the estimated tax payment requirement by one of the following methods:

• Make the first estimated payment on or before April 30 and the other three payments by the standard quarterly due dates;
• Make the entire estimated payment for the tax year by January 15 of the subsequent year and file the Iowa income tax return by April 30 of the subsequent year; or
• File the Iowa income tax return and pay the tax in full on or before March 1 of the subsequent year.

If the farmer or fisher elects one of the latter two options, Form IA 2210F must be filed with the Iowa income tax return, and the applicable box on Line 35 of the IA 1040 must be checked.

Adjusted estimates

Whenever a taxpayer who is required to make estimated payments has reason to believe that the anticipated income tax liability has increased or decreased, any subsequent estimated payments should be amended or adjusted accordingly. The adjusted payment should be made on or before the next installment due date.

Source: Iowa Code § 422.16; Iowa Admin. Code r. 701-308.1; Iowa Admin. Code r. 701-308.2; Iowa Admin. Code r. 701-308.6; Iowa Dept. of Revenue – Estimated Income Tax Payments; Iowa Dept. of Revenue – Penalty for Underpayment of Estimated Tax