Arizona Form 140 is the resident personal income tax return filed with the Arizona Department of Revenue (ADOR). If you lived in Arizona all year and your income exceeded the filing threshold, this is the form you use to report income, apply the state’s flat 2.5% tax rate, and settle up what you owe or claim your refund. Your starting point is federal adjusted gross income from IRS Form 1040, and from there Arizona-specific adjustments, deductions, and credits determine your state liability.
Who Has to File Form 140
Form 140 is for full-year Arizona residents. Part-year residents use Form 140PY, and nonresidents with Arizona-source income use Form 140NR. Residency depends on where you kept a permanent home and whether you intended to stay indefinitely, not simply on day counts.
Filing is only required if your Arizona gross income clears certain thresholds, which track the standard deduction. For the 2025 tax year (filed in 2026):
- 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 of a larger standard deduction. One exception overrides the threshold: if you had $400 or more in self-employment income, you must file regardless of total gross income.1Arizona Department of Revenue. Individual Income Tax Information
When You Need Form 140 Instead of 140A
Arizona still offers the shorter Form 140A, but you must use the full Form 140 if any of these apply: 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 charitable contributions, or you claim tax credits beyond the basic family credit.2Arizona Department of Revenue. Individual Income Tax Information – Section: What Form Should I Use? Most filers who claim any of Arizona’s popular credits end up on Form 140.
How Arizona Calculates Your Tax
You can’t start Form 140 without a completed federal return. The calculation begins with federal adjusted gross income from line 11 of your Form 1040.3Arizona Department of Revenue. Arizona Form 140 Resident Personal Income Tax Booklet Arizona then requires specific additions, allows certain subtractions, and applies the flat 2.5% rate to the result.
Additions
Under A.R.S. 43-1021, certain income the federal return excluded has to be added back. 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 take off. The most valuable subtractions for typical filers:
- Social Security and railroad retirement benefits included in federal AGI are fully subtractable, making 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 dollar cap for tax years beginning after December 31, 2020.
Other eligible subtractions include certain disability income, organ donation expenses, and tribal income earned on a reservation. The Form 140 instruction booklet details each.5Arizona Legislature. Arizona Code 43-1022 – Subtractions From Arizona Gross Income
Standard Deduction
After adjustments, you subtract either the standard deduction or itemized deductions. For 2025, the standard deduction is $15,750 for single filers and $31,500 for married couples filing jointly. Arizona also lets you increase the standard deduction by 25% of your charitable contributions, something the federal return doesn’t offer.1Arizona Department of Revenue. Individual Income Tax Information
Credits That Reduce Your Tax Bill
Arizona offers several nonrefundable credits that cut your tax dollar for dollar. Because the rate is only 2.5%, even modest credits can erase much of what you 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. The maximum is $200 for single, head of household, and married filing separate filers, and $400 for married couples filing jointly. Claim it on Form 322.6Arizona Department of Revenue. Public School Tax Credit
Private School Tuition Organization Credits
Arizona has two separate credits for contributions to certified school tuition organizations (STOs). For 2026, the maximums are:
- 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 by contributing under each program.7Arizona Department of Revenue. Credits for Contributions to Certified School Tuition Organizations
Dependent Tax Credit
Starting with the 2019 tax year, Arizona replaced the dependent exemption with a dependent credit of $100 per dependent under 17 and $25 per dependent 17 or older. Higher-income taxpayers may see this credit phased out.8Arizona Department of Revenue. Deductions and Exemptions
Keep receipts from any school or STO showing the date, amount, and qualifying purpose of the contribution.
Deadline and Extensions
Form 140 is due April 15, matching the federal deadline. If that date falls on a weekend or holiday, the deadline moves to the next business day.
Arizona grants an automatic six-month extension to October 15. Request it by filing Arizona Form 204 before the original due date, or Arizona will honor a valid federal extension. If you’re using a federal extension and paying your Arizona balance electronically, you don’t have to mail Form 204 at all.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 through approved software is the fastest route. ADOR offers free e-filing for qualifying taxpayers, and most commercial software supports Arizona returns. E-filed returns during the 2026 season have been processing in roughly six days.10AZTaxes.gov. Check Refund Status
Paper is still accepted but slower, running about 20 days as of 2026. The mailing address depends on whether you’re sending a payment:
- 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 payment.11Arizona Department of Revenue. Mailing Addresses You can also pay electronically through ADOR’s website by bank transfer or credit card.
Penalties and Interest
Filing late triggers a penalty of 4.5% of the tax owed for each month or partial month the return is late, up to 25%. A separate late payment penalty of 0.5% per month applies to unpaid balances, capped at 10%. These stack if you file late and pay late.12Arizona Legislature. Arizona Code 42-1125 – Civil Penalties
Interest also accrues on unpaid balances from the original due date. Arizona sets the rate quarterly at the federal short-term rate plus three percentage points. For 2026, it’s 7% January through March and 6% April through June.13Arizona Department of Revenue. Interest Rates
A separate underpayment penalty applies if you owed more than $1,000 at filing and didn’t make sufficient estimated payments during the year. You can generally avoid it by paying at least 90% of the current year’s tax or 100% of the prior year’s liability through withholding or quarterly estimates. Form 221 calculates the penalty if it applies.
Tracking Your Refund
Check your refund status at AZTaxes.gov using your Social Security number and the refund amount from your return. E-filed returns are running about six days in 2026; paper returns about 20 days. Returns pulled for additional review take longer.10AZTaxes.gov. Check Refund Status
Fixing a Return After You File
If you spot an error after filing, correct it with Form 140X, Arizona’s individual amended return. You can only file 140X after the original has been processed, and amended returns can’t be e-filed. Mail them to the same P.O. Box addresses used for original returns.
You have four years from the original filing date to claim a refund through an amendment. If you underreported income by more than 25%, ADOR has six years to assess additional tax, and there’s no time limit at all if the return was fraudulent or never filed.14Arizona Department of Revenue. Arizona Form 140X Individual Amended Income Tax Return Instructions
If you amend your federal return or the IRS changes your federal taxable income, you have 90 days from the final federal determination to file a matching Arizona 140X. Miss that window and you can lose a refund you’d be entitled to or face penalties on additional tax owed.
Keep copies of your 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 a second look.