Form 1040-X, Amended U.S. Individual Income Tax Return
Correct a previously filed individual income tax return to fix income, deductions, credits, or filing status.
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About Form 1040-X
Form 1040-X is used to amend a federal individual income tax return you already filed. You might need it if you forgot to report income, missed a deduction or credit, or need to change your filing status or number of dependents after filing.
The form uses a three column layout that shows the original amounts, the net change, and the corrected amounts. You also explain the reason for each change so the IRS can process the amendment. Amending can result in an additional refund or an additional amount owed.
There are time limits for claiming a refund on an amended return, generally tied to when the original return was filed or the tax was paid. File a separate Form 1040-X for each tax year you are correcting and follow the instructions for how to submit it.
Who needs to complete it
- Taxpayers who discovered an error on a return they already filed.
- People who received a corrected W-2 or 1099 after filing.
- Filers who want to claim a deduction or credit they missed originally.
- Anyone who needs to change filing status or dependents on a filed return.
How to fill out Form 1040-X
- 1Enter the tax year you are amending and your personal information.
- 2Fill in the original amounts, the net change, and the corrected amounts in the three columns.
- 3Report changes to income, deductions, credits, and tax as directed on each line.
- 4Recalculate your total tax, payments, and any refund or balance due.
- 5Write a clear explanation of each change in the explanation section.
- 6Attach any forms or schedules that support your changes.
- 7Follow the line-by-line instructions on the official form for filing and payment options.
- 8Sign, date, and submit a separate Form 1040-X for each year you are amending.
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Frequently asked questions
When should I file Form 1040-X?
File it when you need to correct a return you already submitted, such as fixing income, deductions, credits, filing status, or dependents.
Is there a deadline to amend for a refund?
Yes. To claim a refund there is generally a time limit tied to when you filed the original return or paid the tax. Check the instructions for the specific rules.
Can I file one 1040-X for several years?
No. File a separate Form 1040-X for each tax year you are correcting.
Will amending delay my original refund?
Your original return is processed on its own. Amended returns generally take longer to process, so any additional refund from the amendment arrives separately.