How to Amend a Tax Return (Form 1040-X): When, How and Time Limits

When you should amend

• You left out income, such as a late 1099 or interest from an Indian account.
• You claimed the wrong filing status or the wrong number of dependents.
• You missed a credit or deduction you qualified for.
• You filed as a resident when you were a nonresident, or the other way round.

When you don't need to

Don't amend for simple math errors — the IRS corrects them and tells you. If the IRS accepted your return but asks for a missing form or schedule, send what it asks for instead of a full amended return.

If you received an IRS notice about the same issue (for example a CP2000), reply to the notice rather than filing a 1040-X on your own.

How to file Form 1040-X

1. Get a copy of the return you are changing and the documents behind the change.
2. Complete Form 1040-X: original amounts, the change, the corrected amounts, and a short explanation.
3. Attach any forms or schedules that changed.
4. E-file it with tax software for tax years 2022 and later; earlier years must be filed on paper.
5. Amend your state return too if the change affects state tax.

Time limits and tracking

To get a refund, the general rule is 3 years from the date you filed the original return, or 2 years from the date you paid the tax, whichever is later. If you owe more, file and pay as soon as possible to limit interest.

Amended returns take longer than original returns to process. Use the IRS "Where's My Amended Return?" tool to follow its status.