Arizona Tax Form 321: Instructions, Credit Limits, and Carryover

Arizona Form 321 is the state tax form you file to claim a dollar-for-dollar credit for cash donations to Qualifying Charitable Organizations (QCOs). For the 2026 tax year, the credit maxes out at $506 if you file as single, head of household, or married filing separately, and $1,009 if you file jointly. Because it is a credit rather than a deduction, each qualifying dollar you give reduces your Arizona tax bill by a full dollar, up to those caps.

2026 Credit Limits

Single or head of household: $506
Married filing jointly: $1,009
Married filing separately: up to $506 per spouse, based on each spouse’s contributions or an even split of the combined total

Arizona adjusts these caps each year using the Phoenix-area consumer price index, and the statute prevents them from falling below the prior year’s amount.¹

The credit is nonrefundable. It can bring your Arizona tax to zero, but it will not produce a refund by itself. Anything you cannot use this year carries forward for up to five consecutive tax years.¹

Which Donations Qualify

Only cash counts. Clothing, food, household goods, and other property donations do not qualify for the Form 321 credit, regardless of their value. The recipient must be certified by the Arizona Department of Revenue as a QCO, which means a 501(c)(3) nonprofit or a designated community action agency that spends at least half its budget on direct services to Arizona residents who receive TANF benefits, are low-income, or have a chronic illness or physical disability.¹

ADOR publishes a searchable list of approved QCOs each year, and each organization has a five-digit QCO code you will enter on the form. Check the list before you donate, or at the latest before you file, so you know the charity is certified for the year you are claiming.²

If you gave through a United Charitable Organization fund, your receipt should name the specific qualifying charity, confirm that 100% of your gift goes to it, and include the QCO code. If the code is missing, look it up on the ADOR list.³

Form 321 does not cover foster care charities. Donations to Qualifying Foster Care Charitable Organizations go on Form 352 instead, with its own separate caps ($632 single or head of household, $1,262 joint for 2026). You can claim both credits in the same year.²

Deadline to Donate

Arizona lets you back-date qualifying donations to the prior tax year. A contribution made on or before April 15 of the following year can be applied to either year, your choice. A gift on March 1, 2027, for example, can land on your 2026 return or your 2027 return.¹

One thing to watch: if the 2027 caps come in higher than the 2026 caps because of the inflation adjustment, a January-to-April 2027 donation you want to claim at the higher amount has to wait for your 2027 return. The charity also has to be on the approved QCO list for whichever year you apply the gift to.²

How to Fill Out Form 321

Pull your donation receipts first. You need the charity’s name, QCO code, date of contribution, and amount for each gift. You also need your Arizona return (Form 140 for full-year residents, Form 140PY for part-year residents) so you know your tax liability.

Part 1: Current-Year Contributions

List each QCO you donated to during the tax year. Enter the five-digit QCO code in column (a) and the cash amount in the appropriate column, then total your contributions. If the total exceeds your filing-status cap, the form limits the credit to that cap. The smaller of your contributions or the cap becomes your current-year credit.³

Part 2: Carryover From Prior Years

If you have unused credit from any of the prior five years, enter the original credit, the portion used in intervening years, and the balance available now. The oldest year’s credit gets used first. Your combined credit (current year plus carryover) still cannot exceed your actual Arizona tax for the year.³

Totaling and Filing

The last lines of Form 321 combine Part 1 and Part 2 into a total available credit. Transfer that amount to Form 301 (Nonrefundable Individual Tax Credits and Recapture), which aggregates all your nonrefundable credits before the combined figure flows to your main return. File Form 321 and Form 301 together with your Arizona income tax return. E-filing software handles this automatically; if you paper-file, attach both forms behind your main return.³

Keep your receipts. You do not mail them to ADOR, but the department can ask for them later.

If Your Credit Is Bigger Than Your Tax

Unused credit does not disappear at year-end. The excess carries forward for up to five consecutive tax years, after which any remaining balance expires. Track your carryover each year, because you will need those figures to complete Part 2 the next time you file Form 321.¹

Effect on Your Federal Return

Arizona treats the Form 321 credit as a substitute for a state charitable deduction, so you cannot claim both at the state level. The same cash gift can still be deducted as a charitable contribution on your federal return if you itemize on Schedule A, which means one donation can reduce both your Arizona tax (through the credit) and your federal tax (through the deduction).¹

1
Arizona Legislature. Arizona Revised Statutes 43-1088 – Credit for Contribution to Qualifying Charitable Organization
2
Arizona Department of Revenue. Credits for Contributions to QCOs and QFCOs
3
Arizona Department of Revenue. Form 321 Instructions