Arizona’s Personal Income Tax Extension – Federal Approval Required
Arizona does not issue a standalone state extension. Instead, the Arizona Department of Revenue automatically honors the federal extension granted through IRS Form 4868, pushing the state filing deadline from April 15, 2026, to October 15, 2026. No separate Arizona form is required – provided you have a valid federal extension and meet the state’s payment threshold.
Payment Deadline
Pay at Least 90% by April 15, 2026
Arizona requires 90% of your current-year tax liability to be paid by the original due date to avoid an extension underpayment penalty.
Extended Filing Deadline
Return Due October 15, 2026
With a valid federal extension in hand, your Arizona return must be filed – not just postmarked – by October 15, 2026.
The 90% Rule: Arizona’s extension covers filing time only. At least 90% of your state tax liability must be paid by April 15, 2026, or you’ll face an underpayment penalty even if your return is filed on time in October.
How the Federal-State Extension Connection Works
When you file IRS Form 4868 and receive a federal extension, Arizona automatically extends your state deadline as well. There is no need to submit a separate Arizona extension form unless you are sending a payment by mail – in which case, use Form 204 (Application for Filing Extension). Keep a copy of your federal Form 4868 confirmation for reference when you eventually file your return.
Check Box 82F on Form 140
When you file your Arizona state income tax return, you must check Box 82F at the top of page 1 on Form 140 to indicate that a federal extension was granted. Skipping this step can create processing problems with your extension status. Have your Form 4868 confirmation nearby when completing your return.
Late Filing and Payment Penalties
Filing after October 15 without an extension carries a 4.5% per month penalty on unpaid tax, up to 25%. Failing to pay at least 90% by April 15 results in a separate 0.5% monthly penalty, capped at 10%. Both penalties can apply simultaneously, so paying enough on time is essential even when you’re taking the filing extension.
Best Practices
- ✓File IRS Form 4868 before April 15 – your Arizona extension depends on it.
- ✓Pay at least 90% of your Arizona tax liability by April 15, 2026, to avoid the underpayment penalty.
- ✓Use aztaxes.gov for ACH debit payments – no convenience fee, instant confirmation.
- ✓Check Box 82F on Form 140 when you file your Arizona return.
- ✓Keep copies of your Form 4868 confirmation and all payment records.
- ✓Mark October 15, 2026, on your calendar as the hard filing deadline.
Arizona’s extension process is straightforward once you have your federal extension secured. The most important step is paying 90% of your tax liability by April 15 – that single obligation determines whether your extension is penalty-free. Use aztaxes.gov for fast, no-fee electronic payments, and make a note to check Box 82F when October rolls around.
Quick Reference Table
Arizona State Tax Extension
