To file an Arkansas amended tax return, refile the same form you used originally (AR1000F for full-year residents, AR1000NR for nonresidents, or AR1000S for part-year residents), check the “Amended Return” box in the upper-right corner, attach a written explanation and supporting documents, and mail the package to the Department of Finance and Administration. Arkansas does not have a separate amended return form, and amended returns cannot be filed electronically.
Which Form to Use
Arkansas has no equivalent to the federal 1040-X. You use the same return you filed the first time and mark it as amended. Complete the entire form from scratch with the corrected figures. Do not fill in only the lines that changed. The DFA treats the amended return as a full replacement, so every line needs a number.
One timing detail matters: wait until the DFA has finished processing your original return before you mail the amendment. Submitting both close together creates confusion in the system and slows everything down.
What to Attach
Before mailing, gather the following:
- A copy of your original Arkansas return, so you can see exactly what changed.
- Any corrected income documents that prompted the amendment (new or corrected W-2s, 1099s, or schedules).
- A copy of your federal Form 1040-X, if you also amended federally, or the IRS notice if the IRS adjusted your federal liability.
- A written explanation describing each change and why you made it. This is required.
Be specific in the explanation. “Correcting income” tells the reviewer nothing. “Added $4,200 in freelance income from 1099-NEC not included on original return” tells them what they need. Staple the supporting documents to the return. Amended returns are reviewed manually, and missing paperwork stalls the process.
Deadline to File
To claim a refund, you have the later of three years from the date you filed the original return or two years from the date you paid the tax. Whichever is later governs.
Federal changes shorten your window. If the IRS adjusts your federal liability, Arkansas requires you to report those adjustments to the DFA within a set period after the federal determination becomes final. Miss that window and you can face penalties and interest even if the state understatement wasn’t intentional. If an IRS notice lands in your mailbox, treat the Arkansas amendment as time-sensitive.
One boundary worth flagging: Arkansas does not allow net operating loss carrybacks, even for farming businesses that qualify federally. NOLs can only be carried forward on your Arkansas return, so a federal carryback is not a reason to amend a prior-year Arkansas return.
Where to Mail It
Print the completed return and mail it to:
Arkansas State Income Tax
Amended Tax Section
P.O. Box 3628
Little Rock, AR 72203-3628
If you owe additional tax, include payment with the return. The DFA uses a separate payment voucher (Form AR1002V) when a payment accompanies a return, so check the current instructions to confirm whether a different address applies. To verify before mailing, call the individual income tax line at (501) 682-1100.
If You Owe More
An amendment that shows underpayment triggers interest and potentially penalties on the difference. Interest runs at 10% per year on unpaid tax, calculated from the original due date (April 15 for calendar-year filers) until the date you pay.
Two penalties can apply on top of interest:
- Failure to pay: 1% of the unpaid tax for each month the balance is outstanding.
- Failure to file: 5% per month if the original return was also late.
The combined failure-to-file and failure-to-pay penalties are capped at 35% of the unpaid tax. A separate 10% negligence penalty applies if the DFA finds the underpayment resulted from negligence or intentional disregard of the rules, but that penalty does not stack on top of the two monthly penalties.
Interest keeps accruing from the original due date no matter what, but the monthly penalties stop the moment you file and pay. If you discover you owe, don’t sit on it. Every month costs at least another 1%.
Processing Time and Tracking
Amended returns take considerably longer than originals because a person reviews them by hand. A standard paper return might take six to ten weeks. An amended return can take several months.
You can check refund status through the Arkansas Taxpayer Access Point at atap.arkansas.gov, though the tool’s usefulness for amended returns specifically is limited. For a reliable update, call (501) 682-1100 or email Individual.Income@dfa.arkansas.gov. Keep copies of the amended return, the written explanation, and every supporting document you sent for at least three years after filing.