Arizona State Income Tax: Complete Guide for Residents, Part-Year Residents & Nonresidents (2026)

Arizona state income tax is among the simplest in the United States. Since the 2023 tax year, the state has maintained a flat tax rate of 2.5% — and that rate remains unchanged for 2026. Whether you're a long-time Arizona resident, a retiree enjoying the Grand Canyon State's sunshine, a military member, or someone who recently relocated, this guide covers everything you need to know about filing Arizona income taxes in 2026: updated thresholds, new credit limits, the expanded federal SALT cap, and the latest guidance from the Arizona Department of Revenue (ADOR).

Quick Facts for 2026:

1. Flat income tax rate: 2.5% (unchanged)
2. Filing deadline: April 15, 2026
3. Standard deduction (Single): $15,750
4. Standard deduction (Married Filing Jointly): $31,500
5. Federal SALT cap (2026): $40,000 (increased from $10,000 under OBBBA)

What Is Arizona State Income Tax?

State income tax is a tax levied by the state government on the income you earn within a given tax year. Unlike the federal income tax system which uses a progressive bracket structure Arizona uses a flat rate system, meaning every taxpayer pays the same percentage of their income regardless of how much they earn.

How Arizona Income Tax Works: Flat Rate System Explained

Arizona's individual income tax rate is a flat 2.5%. This rate applies to all taxable income for both residents and nonresidents who earn income from Arizona sources. The flat rate was introduced for the 2023 tax year, replacing the previous tiered system that had multiple brackets.

This means that if you earn $40,000 a year or $400,000 a year, you pay the same 2.5% rate on your Arizona taxable income. Your starting point for calculating your Arizona taxable income is your Federal Adjusted Gross Income (FAGI) you then apply any state-specific additions or subtractions.

Example for 2026:

1. Federal AGI: $65,000
2. Standard Deduction (Single): $15,750
3. Arizona Taxable Income: $49,250
4. Arizona Tax Owed (2.5%): $1,231

Arizona vs. Federal Income Tax: Key Differences

Is Arizona a Tax-Friendly State?

Yes, Arizona consistently ranks as one of the most tax-friendly states in the U.S., especially for retirees and military households. Key advantages include:

1. Low flat income tax rate of 2.5%
2. No tax on Social Security benefits
3. No estate or inheritance tax
4. Full exemption on active-duty and military retirement pay
5. Third-lowest average property tax rate in the country (0.48%)
6. No local income tax

Who Has to File Arizona State Income Tax?

Not every Arizona resident or income earner is required to file a state return. Whether you need to file depends on your gross income, filing status, and residency status.

Filing Requirements for Full-Year Residents

Arizona full-year residents must file a state income tax return if their gross income meets or exceeds the applicable threshold. Gross income for Arizona purposes is calculated the same way as for federal income tax purposes, with certain exclusions for income Arizona law does not tax (e.g., Social Security, military pay, U.S. government bond interest).

Gross Income Thresholds by Filing Status (2026)

Per the Arizona Department of Revenue's February 2026 guidance, the filing thresholds for the 2025 tax year (returns filed in 2026) are:

Note: These amounts may be subject to change pending final legislative approval. Nonresidents must prorate these thresholds based on their Arizona income ratio (Arizona gross income ÷ federal adjusted gross income). See Form 140NR instructions.

Special filing rules to know for 2026:

1. If you had self-employment income of $400 or more, you must file even if your total income is below the threshold.
2. If someone else can claim you as a dependent and you earned over $15,750, or had investment income over $1,400, you should still file.
3. If Arizona income tax was withheld from your wages or pension, file a return to claim a refund — even if your income is below the threshold.

Part-Year Residents: When Do You Need to File?

You are a part-year resident if you either:

1. Moved into Arizona during the tax year with the intent to become a permanent resident, or
2. Moved out of Arizona during the tax year with the intent to give up Arizona residency.

Part-year residents must file if they meet the gross income thresholds. They pay Arizona tax on:

1. All income earned while they were an Arizona resident (from all sources), and
2. All income earned from Arizona sources during the period they were a nonresident.

Use Form 140PY for part-year resident returns.

2026 ADOR Update: ADOR has announced enhanced compliance reviews for residency transition claims. Filers moving in or out of Arizona may be asked for additional documentation to confirm income sourcing and residency dates, particularly when using Forms 140NR and 140PY.

Nonresidents: Arizona-Sourced Income and Filing Obligations

Nonresidents are taxed only on income earned from Arizona sources — wages from an Arizona employer, rental income from Arizona property, or business profits from Arizona operations. Per A.R.S. § 43-1091, Arizona gross income for nonresidents includes only that portion of federal AGI representing income from within the state.

Exception: Income earned by a nonresident who is temporarily in Arizona for declared disaster recovery is not Arizona-sourced income and is not taxable.

Arizona State Income Tax Rate

Arizona's Flat Tax Rate of 2.5%: What It Means for You

The ADOR confirmed in its 2026/27 tax year guidance that Arizona's flat individual income tax rate remains at 2.5% — unchanged from 2023, 2024, and 2025. All filing types (single, married jointly, married separately, head of household, widowed) are taxed at this same rate. There are no brackets, no surcharges, and no income-based phase-outs on the rate itself.

How the Flat Rate Replaced the Old Bracket System

Before 2023, Arizona used a graduated bracket system with rates ranging from 2.59% to 4.5%. The legislature transitioned to the current flat rate beginning with tax year 2023. Additionally, Arizona law (S.B. 1318) provides a mechanism for the income tax rate to be automatically reduced in future tax years if the state generates a structural surplus — defined as 50% of the surplus between ongoing General Fund revenues and expenditures.

Comparing Arizona's Tax Rate to Other States

Arizona's 2.5% flat rate is one of the most competitive individual income tax rates in the country:

Arizona Residency Status and How It Affects Your Taxes

Your residency status determines which income is subject to Arizona tax.

Full-Year Resident: Definition and Tax Obligations

You are a full-year resident if your domicile — your permanent home, the place you intend to return to — is Arizona for the entire tax year. A full-year resident is taxed on all income from all sources, regardless of where that income was earned. This includes wages from another state, out-of-state rental income, and retirement income from another state's pension fund.

Temporarily leaving Arizona (for work, travel, or military duty) does not change your residency status.

Part-Year Resident: How Income Is Prorated

Part-year residents are taxed on income earned during their Arizona residency period plus Arizona-sourced income during their nonresident period. Pension income is only taxable on the portion received while you were an Arizona resident.

2026 Compliance Note: ADOR's updated instructions for Forms 140NR and 140PY clarify the proration rules for exemptions and standard deductions. Review the revised allocation worksheet before filing.

Nonresident: Taxable Arizona-Sourced Income

Nonresidents pay Arizona tax only on income earned from within the state. Common examples include wages from an Arizona-based employer, income from an Arizona rental property, or profits from an Arizona business.

How to Determine Your Arizona Residency Status (ITP 92-1)

The ADOR's official procedure ITP 92-1 (Procedure for Determining Residency Status) provides detailed guidance for complex situations — such as maintaining homes in multiple states, being a military spouse, or moving mid-year. Consult ITP 92-1 or a licensed tax professional if your residency situation is not straightforward.

Arizona Filing Status Options

The filing status used on your Arizona return may differ from your federal return.

Single Filing Status

File as single if, as of December 31 of the tax year, you:

1. Have never been married
2. Are legally separated under a divorce or separate maintenance decree
3. Were widowed before January 1 of the tax year, did not remarry, and don't qualify as a surviving spouse with dependents

Married Filing Jointly in Arizona

You may file a joint Arizona return if you were married as of December 31 of the tax year — even if you filed separate federal returns, or if your spouse passed away during the year and you did not remarry.

You cannot use Form 140 jointly if your spouse is a nonresident alien, a resident of another state, or a part-year Arizona resident. In those cases:

1. Nonresident alien spouse → Form 140NR
2. Part-year resident spouse → Form 140PY

Married Filing Separately and Community Property Rules

Arizona is a community property state. Filing separately means each spouse reports one-half of all community income and their own separate income. Both spouses must make the same choice: either both itemize, or both take the standard deduction. One cannot itemize while the other takes the standard deduction.

Head of Household: Qualifications and Requirements

You may file as head of household on your Arizona return only if you qualify for head-of-household or qualifying widow

Which Arizona Tax Form Should You Use?

Choosing the correct form ensures you don't make errors or miss out on eligible deductions and credits.

Form 140: For Taxable Income of $50,000 or More

Use Form 140 if any of the following apply:

1. Your Arizona taxable income is $50,000 or more, regardless of filing status
2. You are making adjustments to income
3. You are itemizing deductions
4. You are increasing the standard deduction by 25% of charitable deductions (2019 and forward)
5. You are claiming tax credits other than the family income tax credit, excise tax credit, property tax credit, or dependent tax credit
6. You are claiming estimated payments

Form 140A: Simplified Return for Full-Year Residents

You can use Form 140A if all of the following are true:

1. You and your spouse (if married filing jointly) are both full-year Arizona residents
2. Your Arizona taxable income is less than $50,000
3. You are a calendar-year filer
4. You are not making income adjustments
5. You are not itemizing deductions
6. The only credits you claim are: family income tax credit, property tax credit, credit for increased excise taxes, or dependent tax credit
7. You are not claiming estimated tax payments

Form 140EZ: Easiest Option Who Qualifies?

Form 140EZ is the simplest option and can be used if all of the following apply:

1. You are single, or married filing jointly
2. You (and your spouse, if applicable) are full-year Arizona residents
3. You were under age 65 and not blind at the end of the tax year
4. You are not claiming any dependents or exemptions for qualifying parents/grandparents
5. You are not making income adjustments or itemizing deductions
6. Your Arizona taxable income is less than $50,000
7. The only credits you claim are the family income tax credit or the credit for increased excise taxes

Form 140PY: For Part-Year Residents

Use Form 140PY if you moved into or out of Arizona during the tax year and established or gave up Arizona residency.

Form 140NR: For Nonresidents

Use Form 140NR if you are a nonresident who earned income from Arizona sources during the tax year. Nonresidents must prorate income thresholds using their Arizona income ratio.