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Form guide

Form 1040-X1040-X

Amends an individual return that was already filed.

United StatesTaxIRS

Edition 12/2025

Version last read from the agency on September 28, 2026

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About Form 1040-X

Who fills it in

File Form 1040-X to correct a Form 1040, 1040-SR or 1040-NR you already filed, to make certain elections after the deadline, or to claim a carryback of a loss or unused credit.

Where it goes

You can file it electronically with tax software to amend the current or two prior tax periods. Paper filing is still an option.

When

For a credit or refund, file within 3 years after you filed the original return (extensions included) or within 2 years after you paid the tax, whichever is later.

Watch out for

  • File Form 1040-X only after the original return. After the due date, don’t send another original return for the same year — it can delay your refund.
  • You can amend more than once for the same year, as long as each Form 1040-X is filed on time.

Read from the agency’s pages on October 8, 2026: IRS — About Form 1040-X · IRS — Instructions for Form 1040-X

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