Arizona Income
Tax Rates & Rules

The 2.5 percent flat tax, Arizona taxable income, residency, filing rules and Form A-4 withholding.

Arizona imposes a flat 2.5 percent individual income tax on Arizona taxable income for tax year 2026. The same 2.5 percent rate applies across filing statuses and income levels, so Arizona no longer uses multiple individual income tax brackets.

Payroll withholding works differently from the annual tax rate. Arizona employees generally choose a withholding percentage from 0.5 percent through 3.5 percent on Form A-4. That election is designed to prepay expected tax and should not be confused with the 2.5 percent tax rate used on the annual return.

Arizona Income Tax Rate for 2026

Arizona's individual income tax rate is 2.5 percent of Arizona taxable income. The flat rate applies to residents and to Arizona-source taxable income of nonresidents under the state's individual income tax law.

How Arizona Taxable Income Is Calculated

Arizona individual income tax starts with federal adjusted gross income then applies Arizona-specific subtractions, additions, deductions and exemptions before the 2.5 percent tax rate is applied.

• Start with federal adjusted gross income.
• Apply Arizona additions and subtractions required by state law.
• Determine Arizona adjusted gross income.
• Apply the state standard deduction or itemized deductions when eligible.
• Apply Arizona exemptions and other adjustments that are allowed.
• Calculate Arizona taxable income.
• Multiply Arizona taxable income by 2.5 percent.
• Subtract eligible credits to determine final Arizona tax liability.

This structure is why a simple calculation of 2.5 percent of salary can be wrong. Salary is not necessarily the same as Arizona taxable income.

Does Arizona Have Income Tax Brackets?

No. Arizona does not use multiple individual income tax brackets for tax year 2026. The state uses a flat 2.5 percent rate for all taxable income levels.

Older Arizona tax tables with multiple rates are obsolete for current individual income tax purposes. Content that presents several current Arizona income tax brackets can therefore mislead taxpayers.

Arizona Standard Deduction and Filing Thresholds

Arizona uses a state standard deduction and filing thresholds that are updated through the annual return instructions. Return-specific amounts can change with tax-year updates, so the 2026 Form 140 instructions should be used once the Department of Revenue publishes the full 2026 return package.

As of August 24, 2026, the latest published Arizona Form 140 instructions are for tax year 2025. Those instructions use standard deductions of $15,750 for single or married filing separately, $31,500 for married filing jointly and $23,625 for head of household. These 2025 figures should not automatically be represented as final 2026 amounts before the 2026 forms are released.

Editorial accuracy note: the 2.5 percent tax rate is established for tax year 2026. Return-specific 2026 deduction and filing-threshold amounts should be updated when ADOR publishes the 2026 Form 140 instructions.

Who Has to File an Arizona Income Tax Return?

Arizona filing requirements depend on filing status, gross income and residency. Full-year residents, part-year residents and nonresidents can all have filing obligations, but nonresident thresholds are adjusted based on the Arizona income ratio.

Arizona residents are taxed on income under the state's resident rules. Nonresidents report Arizona-source income. Part-year residents report income earned while an Arizona resident plus Arizona-source income received during the nonresident portion of the year.

Arizona Residents vs. Nonresidents

A full-year Arizona resident is generally subject to Arizona income tax on income from all sources, with state adjustments and credits applying as allowed. Domicile is central to Arizona residency.

A nonresident is taxed only on Arizona-source income. Arizona uses Form 140NR for nonresident returns. When the same income is taxed by Arizona and another state, a credit can be available under the applicable rules to reduce double taxation.

How Arizona Treats Part-Year Residents

Part-year residents generally report all income earned while they were Arizona residents plus Arizona-source income earned before moving into Arizona or after leaving the state. Form 140PY is used for the part-year return.

Moving during the year can therefore change the amount of income subject to Arizona tax without creating a separate 'exit tax.' The key questions are when residency changed and whether income remained Arizona-source after the move.

Arizona Income Tax for Remote Workers

Remote-worker taxation depends on where the employee physically works plus residency. Arizona requires state withholding for an Arizona resident physically working in Arizona even when the employer is based elsewhere.

An Arizona resident working outside Arizona can ask an out-of-state employer to withhold Arizona income tax if the employer agrees. For a nonresident working temporarily in Arizona, special withholding exceptions can apply when the employee is physically present in Arizona for fewer than 60 days and the statutory conditions are met.

Arizona Withholding Rates and Form A-4

Arizona wage withholding uses employee-selected percentages of gross taxable wages. The available percentages are 0.5 percent, 1.0 percent, 1.5 percent, 2.0 percent, 2.5 percent, 3.0 percent and 3.5 percent.

If a new employee does not provide Form A-4 within the required period, the employer generally withholds 2.0 percent of gross taxable wages until a valid form is received. Employees can also request an additional dollar amount per paycheck.

Because withholding is not the same as annual tax liability, an employee who wants to see the payroll effect can use the Arizona paycheck calculator before comparing withholding with expected annual tax.

Estimated Arizona Income Tax Payments

Estimated tax can be required when withholding will not cover enough of the expected Arizona tax liability. This can affect self-employed taxpayers, investors and people with substantial income that is not subject to wage withholding.

Arizona generally expects estimated payments plus withholding to reach either 90 percent of the current-year tax or 100 percent of the prior-year tax when the prior-year method is available. For 2026, the state lists estimated payment dates of April 15, June 15, September 15, 2026 and January 15, 2027.

Arizona Tax Credits Can Change Final Liability

Arizona offers a number of individual income tax credits. Credits are applied after the tax is calculated and can reduce final liability. Some credits are refundable while others are nonrefundable or subject to separate limits.

A paycheck withholding percentage does not automatically account for every tax credit a taxpayer may claim on the annual return. This is another reason withholding and final tax liability can differ.

Arizona Income Tax and Payroll Records

The annual Arizona income tax return determines state tax liability for the year while a pay stub documents current-period wages and withholding. The two documents should agree on the payroll amounts that flow from the employer's records, but they serve different purposes.

After genuine payroll values have been verified, the Arizona pay stub generator can organize wages and Arizona withholding into an employee payroll statement. For a broader document workflow, the check stub generator can be used with truthful payroll information.

Methodology and Source Review

This guide reflects Arizona Department of Revenue withholding rules, residency guidance, current filing information and Arizona statutory tax-rate provisions available as of August 24, 2026. The 2.5 percent rate is current for 2026. Return-specific deduction, credit and filing-threshold values should be checked against the 2026 Form 140 instructions when that return package is published.