Wyoming — Personal Income Tax

Wyoming does not impose a state personal income tax on individuals. No statute in Title 39, Chapter 12 of the Wyoming Statutes imposes an income tax at the state level, and there is no administrative framework or state agency administering such a tax.

This absence is reinforced by the Wyoming Constitution, Article 15, Section 18, which prohibits the imposition of any income tax unless the taxpayer receives full credit against such liability for all sales, use, and ad valorem taxes paid in the same taxable year. Since that constitutional amendment was ratified in 1974, the Wyoming Legislature has never enacted a personal income tax statute, and no provision of current Wyoming law imposes state-level individual income tax liability.

Wyo. Stat. § 39-12-101 preempts cities, counties, and other local governments from imposing, levying, or collecting income taxes, but this restriction applies only to local governments and does not itself constitute a state-level prohibition or imposition. The absence of a state individual income tax is confirmed by the lack of an enabling statute and the ongoing effect of constitutional Article 15, Section 18.

Wyoming residents, part-year residents, and nonresidents performing services in Wyoming are not subject to any Wyoming personal income tax regardless of source, and no return is required. Federal obligations continue to apply as usual.

Source: Wyoming Constitution art. 15, § 18 Source: Wyo. Stat. tit. 39, ch. 12

Wyoming Constitution Article 15, Section 18, ratified by voters in November 1974, provides that no tax shall be imposed upon income without allowing full credit against such tax liability for all sales, use, and ad valorem taxes paid in the taxable year by the same taxpayer to any taxing authority in Wyoming. This provision does not prohibit an income tax outright. The Wyoming Legislature has never enacted an individual income tax under this constitutional framework.

Source: Wyo. Const. art. 15, § 18

Wyoming residents, part-year residents, and nonresidents have no obligation to file a Wyoming personal income tax return for any tax year. Because Wyoming does not impose a personal income tax, the state requires no return, estimated payment, withholding reconciliation, or other income-based filing from individuals, regardless of income level, source, or residency status.

Source: Wyo. Stat. § 39-12-101

Wyoming employers are not required to withhold personal income tax from employee wages. Because Wyoming does not impose a personal income tax under Wyo. Stat. § 39-12-101, there is no state tax for employers to withhold from compensation paid to employees, regardless of employee residency or work location. Employers remain obligated to withhold federal income tax and FICA taxes.

Source: Wyo. Stat. § 39-12-101

Wyoming's lack of a personal income tax does not automatically shield an individual from income tax obligations in other states. States with income taxes can assert tax claims on Wyoming residents through statutory residency rules, domicile disputes, and source-income taxation — even when the individual has established Wyoming domicile and lives primarily in Wyoming.

## Statutory residency can override Wyoming domicile

Many income-tax states impose tax on individuals who meet a statutory resident test, regardless of where the person is domiciled. New York, for example, treats as a resident (taxable on worldwide income) any individual who (1) maintains a permanent place of abode in New York and (2) spends more than 183 days in New York during the tax year, even if that person's domicile is Wyoming. Under N.Y. Tax Law § 605(b)(1)(B), any part of a day in New York counts as a full day; an individual domiciled in Wyoming who maintains a New York apartment and spends 184 or more days in the state will be taxed as a New York resident on all income, not just New York-source income.

California applies a different test. Under Cal. Rev. & Tax. Code § 17014(a)(1), an individual is a California resident if present in California "for other than a temporary or transitory purpose." California regulations provide that presence exceeding six months, coupled with non-temporary activity (employment, business operations, or indefinite health treatment), can establish California residency even when the individual is domiciled in Wyoming. A Wyoming-domiciled individual who spends seven months per year working in California may be treated as a California resident for the entire year.

## Domicile disputes

States may challenge a claimed change of domicile from their state to Wyoming. New York and California, in particular, conduct aggressive residency audits of individuals who claim to have changed domicile to a no-income-tax state. The burden of proof typically falls on the taxpayer to demonstrate, by clear and convincing evidence, that they have abandoned the prior domicile and established Wyoming as their new permanent home. Common factors auditors examine include the size and location of the individual's primary residence, where business activities are conducted, where family members live, where "near and dear" personal items are kept, voter registration, driver's license, and the proportion of time spent in each state. Maintaining significant ties to the prior state — such as a larger home, active business operations, or more than minimal time spent there — can result in the prior state asserting continued domicile and worldwide income tax liability.

## Source-income taxation

Even a Wyoming resident with no dispute about domicile remains subject to nonresident income tax in states where the individual earns income. Wage income is generally sourced to the state where the services are performed. New York taxes nonresidents on wages for work performed in New York under N.Y. Tax Law § 631; New York also applies a "convenience of the employer" rule that can source income to New York even when a Wyoming-domiciled employee works remotely from Wyoming for a New York-based employer, unless the remote work is for the employer's necessity. California sources compensation based on where the services are performed and applies complex allocation rules to equity-based compensation. Business income, rental income from property located in the state, and certain partnership and S corporation distributive shares are similarly sourced to the state where the underlying activity or property is located.

## Practical implication

A Wyoming resident may owe personal income tax to one or more other states despite owing no Wyoming tax. Common scenarios include: (1) a Wyoming-domiciled remote worker whose employer is in a state that applies a convenience rule; (2) an individual who changed domicile to Wyoming but still spends significant time in a former state and triggers statutory residency there; (3) a Wyoming resident who performs services, owns rental property, or has pass-through business income in an income-tax state. Practitioners advising clients on Wyoming residency should evaluate exposure under the specific statutory-residency, domicile, and source-income rules of every state with which the client has ties.

Source: N.Y. Tax Law § 605 Source: New York DTF Residency FAQs Source: Cal. Rev. & Tax. Code § 17014

Wyoming residents remain subject to all federal income tax obligations under the Internal Revenue Code, regardless of Wyoming's absence of a state personal income tax. Wyoming does not impose a personal income tax, but that absence does not reduce, modify, or eliminate any federal filing requirement, withholding obligation, or tax liability.

## Federal filing requirements apply based on gross income and filing status

Wyoming residents must file a federal income tax return if their gross income exceeds the threshold for their filing status. For tax year 2024, the filing thresholds are: $14,600 for single filers under 65; $29,200 for married filing jointly (both spouses under 65); $21,900 for head of household under 65; and $5 for married filing separately at any age. These thresholds increase for taxpayers age 65 or older. Self-employed individuals must file if net earnings from self-employment exceed $400, regardless of total gross income.

Wyoming residents report all income on their federal return—wages, salaries, self-employment income, investment income, capital gains, retirement distributions, and other income—using the same forms, schedules, and rules that apply to residents of all other states. Wyoming's lack of a state personal income tax does not alter the calculation of federal adjusted gross income, taxable income, deductions, or credits.

## Withholding, estimated payments, and federal payment obligations

Employers paying wages to Wyoming residents must withhold federal income tax and FICA taxes (Social Security and Medicare) under the same federal rules that apply nationwide. While Wyoming employers have no state withholding obligation (because Wyoming imposes no state income tax under Wyo. Stat. § 39-12-101), federal withholding remains mandatory. Employees complete Form W-4 to determine their federal withholding allowances; the absence of state tax does not change federal withholding calculations.

Self-employed Wyoming residents, retirees with substantial investment or pension income, and others who receive income not subject to withholding must make quarterly estimated federal tax payments if they expect to owe $1,000 or more in federal tax for the year after subtracting withholding and refundable credits. Estimated payments are due April 15, June 15, September 15, and January 15 of the following year. Failure to pay sufficient estimated tax can result in federal underpayment penalties, even though no Wyoming personal income tax is owed.

## Federal return filing deadlines and extensions

Wyoming residents must file their federal Form 1040 or 1040-SR by April 15 of the year following the tax year (or the next business day if April 15 falls on a weekend or holiday). This is the same deadline that applies to all U.S. taxpayers. Wyoming residents can request an automatic six-month extension to file by submitting Form 4868 or paying any tax due electronically by the April 15 deadline. An extension to file does not extend the time to pay; interest and penalties accrue on unpaid balances after April 15.

Because Wyoming has no state income tax return, Wyoming residents file only a federal return. Practitioners advising Wyoming residents should ensure clients understand that Wyoming's lack of a state personal income tax means a simpler filing process—one return instead of two—but does not reduce the complexity or obligations of the federal return itself.

## Federal refunds and payments

Wyoming residents who have federal income tax withheld or make estimated payments may be entitled to a federal refund if their payments exceed their federal tax liability. Refunds are issued by the IRS in the same manner as for all taxpayers—by direct deposit or paper check. Wyoming residents who owe additional federal tax must pay by the April 15 deadline to avoid interest and penalties. Payment options include direct debit, credit or debit card, check, money order, or electronic funds withdrawal when filing electronically.

Source: IRS Publication 501, Dependents, Standard Deduction, and Filing Information Source: IRS: Who needs to file a tax return Source: IRS: Estimated taxes (individuals) Source: Wyo. Stat. § 39-12-101

Wyoming does not impose a personal income tax and therefore has no reciprocity agreements with any other state regarding the taxation of wage income.

No Wyoming reciprocal income tax agreements possible Because Wyoming imposes no personal income tax on individuals under current law (see Wyo. Stat. tit. 39, ch. 12), there is no Wyoming income tax liability for residents—even if they work outside the state. Reciprocity agreements are interstate arrangements designed to relieve double taxation of wage income by allowing residents to pay tax only to their state of residence. These agreements can only exist where both involved states have a personal income tax. Accordingly, Wyoming cannot and does not participate in personal income tax reciprocity agreements with any neighboring state, including Montana, Idaho, Utah, Colorado, South Dakota, or Nebraska—all of which do impose an individual income tax.

Implications for Wyoming residents working in other states A Wyoming resident who earns wages in a neighboring state (or any state with an individual income tax) remains subject to the tax rules of that state, because Wyoming offers no shield or offset. Recourse to reciprocity is not available; any tax relief must come from the laws of the work state, not from Wyoming. The neighboring state may tax those wages as income sourced to the work state, and the resident must comply with that state’s filing and payment obligations.

Source: Wyo. Stat. tit. 39, ch. 12

Enactment of Wyo. Stat. § 39-12-101 Wyo. Stat. § 39-12-101, which preempts cities, towns, and counties from imposing their own income taxes, is currently codified in Title 39, Chapter 12 of the Wyoming Statutes. According to the legislative history notes in the official code, the provision was recodified by Laws 1998, ch. 5, § 1. Prior versions similarly prohibited local income taxes, but the statute in its current location dates from this 1998 recodification. This section does not impose a state-level personal income tax, but rather prohibits local governments from levying one.

Wyoming Constitution, Article 15, Section 18, and legislative proposals since 1974 Article 15, Section 18 of the Wyoming Constitution, adopted by voters in November 1974 and effective December 12, 1974, prohibits the imposition of any income tax in Wyoming unless the taxpayer receives a full credit for all sales, use, and ad valorem taxes paid in the same year. This provision makes it practically unworkable to enact a state personal income tax. Legislative records as of June 16, 2026, show that since 1974 no statewide personal income tax has been enacted, and publicly available session summaries and statutory compilations do not reflect any personal income tax bill advancing out of committee or reaching a floor vote in either legislative chamber. The Legislature periodically receives studies or proposals referenced in Legislative Service Office publications, but no actionable bill has received legislative traction under the constitutional regime.

Source: Wyo. Stat. § 39-12-101 Source: Wyoming Constitution art. 15, § 18

For tax year 2025, Wyoming residents—like all U.S. residents—must file a federal income tax return if their gross income exceeds amounts set by the IRS based on filing status and age. These thresholds are not subject to Wyoming law (as the state does not levy personal income tax) but are imposed under federal law and apply equally to Wyoming residents.

2025 IRS filing thresholds for most taxpayers:

• Single, under age 65: $15,750
• Single, age 65 or older: $17,750
• Married filing jointly, both under 65: $31,500
• Married filing jointly, one spouse 65 or older: $33,100
• Married filing jointly, both 65 or older: $34,700
• Head of household, under 65: $23,625
• Head of household, 65 or older: $25,625
• Married filing separately (any age): $5
• Qualifying surviving spouse, under 65: $31,500
• Qualifying surviving spouse, 65 or older: $33,100

Additional rules apply for dependents and for those with self-employment income in excess of $400, regardless of gross income. Individuals who can be claimed as dependents, and those receiving certain types of income (such as self-employment, tips, or household employment), may have different or lower filing requirements.

Source authority and recent confirmation: These thresholds are published by the IRS in Publication 501 for 2025 and are confirmed by the IRS’s “Check if you need to file a tax return” official tool. There have been no amendments or material changes published by the IRS for tax year 2025 since these thresholds were confirmed in IRS guidance as of April 30, 2026.

Source: IRS Publication 501 (2025) Source: IRS: Check if you need to file a tax return

Unable to confirm as of 2026-07-02.

Wyoming imposes no state income tax on individuals, and by extension, no income tax on trusts or estates. However, Wyoming’s fiduciary accounting statute expresses how any income tax obligation—if present—would be allocated within a trust or estate. Under Wyo. Stat. § 2-3-830 (2025):

• Any tax required to be paid by a trustee based on receipts allocated to income must be paid from income.
• Any tax based on receipts allocated to principal must be paid from principal.
• If a trust’s share of an entity’s taxable income reported on a pass-through tax return exceeds the amount of cash received by the trust that is allocated to income, the excess tax must be paid from principal.
• Distributions to beneficiaries that were deductible in computing the trust’s taxable income reduce the tax allocation from income.

This statute refers to "a tax required to be paid by a trustee," but as of June 2026, Wyoming law does not impose a state-level income tax on trusts, estates, or their beneficiaries. The statutory provisions in Wyo. Stat. § 2-3-830 thus govern the internal fiduciary apportionment should Wyoming ever impose such a tax in the future, or when a Wyoming trust or estate owes tax to another jurisdiction (such as state source income tax on real property or business activities outside Wyoming). As explicitly observed in Title 39 of Wyoming’s statutes, there is no existing application of Wyoming state income tax to either trust or estate income.

Practitioners should note the difference between Wyoming’s fiduciary accounting approach and actual liability for state income tax—Wyoming provides procedures for allocation if required, but does not currently impose such a tax by statute or regulation.

Unable to confirm any Wyoming statute in Title 39 imposes an income tax on trusts or estates as of 2026-06-22.

Source: Wyo. Stat. § 2-3-830