Arizona Form 140 is the resident personal income tax return that full-year Arizona residents file each year with the Arizona Department of Revenue (ADOR). It applies Arizona’s flat 2.5% individual income tax rate to your income after state-specific adjustments, deductions, and credits, starting from the federal adjusted gross income (AGI) on your IRS Form 1040. Returns are due April 15, and most filers who claim any of Arizona’s popular credits will end up on this form rather than the shorter Form 140A.
Who Files Form 140
Form 140 is for people who lived in Arizona for the entire calendar year. Part-year residents file Form 140PY, and nonresidents with Arizona-source income file Form 140NR. Residency depends on where you kept a permanent home and whether you intended to stay indefinitely, not just how many days you were physically in the state.
You only need to file if your Arizona gross income clears certain thresholds, which track the standard deduction. For the 2025 tax year (filed in 2026):1Arizona Department of Revenue. Individual Income Tax Information
- Single or married filing separately: $15,750
- Married filing jointly: $31,500
- Head of household: $15,750
Taxpayers 65 or older get higher thresholds because their standard deduction is larger. One exception overrides all of this: if you had self-employment income of $400 or more, you have to file regardless of total gross income.
When You Must Use Form 140 Instead of 140A
Arizona still publishes a shorter Form 140A, but you’re required to use the full Form 140 if any of the following applies: your Arizona taxable income is $50,000 or more, you’re making adjustments to income, you itemize deductions, you increase the standard deduction by 25% of your charitable contributions, or you claim any tax credit beyond the basic family credit.2Arizona Department of Revenue. Individual Income Tax Information – Section: What Form Should I Use?
How the Tax Is Calculated
Your Arizona return begins with the federal AGI from line 11 of your IRS Form 1040, so you need a completed federal return in hand before you start.3Arizona Department of Revenue. Arizona Form 140 Resident Personal Income Tax Booklet From there, Arizona requires certain additions and permits specific subtractions before the flat 2.5% rate is applied.
Additions
Under A.R.S. 43-1021, some income the federal return excluded gets added back for Arizona purposes. The most common item is interest on municipal bonds issued by other states, which is federally tax-free but taxable in Arizona.4Arizona Legislature. Arizona Code 43-1021 – Addition to Arizona Gross Income
Subtractions
A.R.S. 43-1022 lists what you can subtract from Arizona gross income.5Arizona Legislature. Arizona Code 43-1022 – Subtractions From Arizona Gross Income Three of the most valuable:
- Social Security and railroad retirement benefits included in your federal AGI are fully subtractable, which makes them tax-free at the state level.
- Federal civil service retirement and Arizona state and local government retirement benefits qualify for a subtraction of up to $2,500.
- Uniformed services retired or retainer pay is fully subtractable with no cap, for tax years beginning after December 31, 2020.
Other subtractions exist for certain disability income, organ donation expenses, and tribal income earned on a reservation. The Form 140 instruction booklet walks through the full list.
Standard Deduction
After adjustments, you take either the standard deduction or your itemized deductions. For 2025, the standard deduction is $15,750 for single filers and $31,500 for married couples filing jointly. Arizona also lets standard-deduction filers increase that amount by 25% of their charitable contributions, a feature with no federal equivalent.1Arizona Department of Revenue. Individual Income Tax Information The 2.5% flat rate is then applied to what’s left.
Credits Worth Knowing
Arizona’s nonrefundable credits reduce your tax bill dollar for dollar. With a flat rate of only 2.5%, even a modest credit can eliminate a large portion of what you’d otherwise owe.
Public School Tax Credit
Cash contributions or fees paid directly to an Arizona public school for extracurricular activities, character education, or similar programs qualify for a credit of up to $200 (single, head of household, married filing separately) or $400 (married filing jointly). You claim it on Form 322.6Arizona Department of Revenue. Public School Tax Credit
School Tuition Organization Credits
Two separate credits are available for contributions to certified school tuition organizations (STOs) that fund private-school scholarships. The 2026 maximums:7Arizona Department of Revenue. Credits for Contributions to Certified School Tuition Organizations
- Original Individual Credit: $787 single, head of household, or married filing separately; $1,570 married filing jointly.
- Switcher Individual Credit: $784 single, head of household, or married filing separately; $1,561 married filing jointly.
You can claim both in the same year if you contribute to qualifying organizations under each program.
Dependent Tax Credit
Starting with the 2019 tax year, Arizona replaced the old dependent exemption with a dependent tax credit: $100 per dependent under age 17 and $25 per dependent 17 or older. Higher-income taxpayers may see the credit phased out.8Arizona Department of Revenue. Deductions and Exemptions
Keep receipts from the school or STO showing the date, amount, and qualifying purpose of each contribution.
Filing Deadline and Extensions
Form 140 is due April 15, matching the federal deadline. When that date lands on a weekend or holiday, filing moves to the next business day.
For more time, Arizona grants an automatic six-month extension to October 15. Request it by filing Arizona Form 204 before the original due date, or rely on a valid federal extension for the same period. If you have a federal extension and you’re paying Arizona electronically, you don’t need to mail Form 204.9Arizona Department of Revenue. Making Payments, Late Payments, and Filing Extensions
An extension buys time to file, not time to pay. If you expect to owe, estimate the amount and pay it by April 15 to avoid penalties and interest.
How to File and Pay
Electronic filing is the fastest route. ADOR offers free e-file options for qualifying taxpayers, and most commercial tax software supports Arizona returns. E-filed returns during the 2026 season have been processing in about six days.10AZTaxes.gov. Check Refund Status
Paper returns are still accepted but slower, running around 20 days as of 2026. Mailing address depends on whether a payment is enclosed:11Arizona Department of Revenue. Mailing Addresses
- With payment: Arizona Department of Revenue, P.O. Box 52016, Phoenix, AZ 85072
- Refund or no payment due: Arizona Department of Revenue, P.O. Box 52138, Phoenix, AZ 85072
Make checks payable to the Arizona Department of Revenue and write your Social Security number and the tax year on the check. Electronic payments through ADOR’s website accept bank transfers and credit cards.
Penalties and Interest
Filing late triggers a penalty of 4.5% of the tax owed per month or partial month, up to 25%. A separate late payment penalty of 0.5% per month applies to unpaid balances, capping at 10%. Both can run at the same time.12Arizona Legislature. Arizona Code 42-1125 – Civil Penalties
Interest accrues on any unpaid balance from the original due date. Arizona sets the underpayment rate quarterly at the federal short-term rate plus three points. For 2026, the rate is 7% from January through March and 6% from April through June.13Arizona Department of Revenue. Interest Rates
A separate underpayment penalty applies if you owed more than $1,000 at filing time and didn’t have enough paid in through withholding or estimated payments during the year. You generally avoid it by paying at least 90% of the current year’s tax or 100% of the prior year’s liability. Form 221 handles the calculation.
Tracking Your Refund
Check refund status at AZTaxes.gov using your Social Security number and the refund amount from your return. Electronic returns typically process in about six days and paper returns in about 20 during the 2026 season. Returns pulled for additional review take longer.10AZTaxes.gov. Check Refund Status
Amending a Return
To correct an error after filing, submit Form 140X, Arizona’s individual amended return. You can only file 140X after the original return has been processed, and amended returns cannot be e-filed. Mail them to the same P.O. Box addresses used for original returns.
You have four years from the date you filed the original return to claim a refund on an amended return. ADOR has six years to assess additional tax if income was underreported by more than 25%, and there’s no time limit if the return was fraudulent or never filed.14Arizona Department of Revenue. Arizona Form 140X Individual Amended Income Tax Return Instructions
If you amend federally or the IRS adjusts your federal taxable income, you have 90 days from the date of the final federal determination to file a corresponding Arizona Form 140X. Missing that window can forfeit a refund or trigger penalties on any additional tax owed.
Keep copies of the filed return, W-2s and 1099s, credit receipts, and payment confirmations for at least four years, and six years if you claimed a large subtraction or credit that could draw questions.