Instructions for Form 1040-X›(Rev. December 2025)›! more than the correct amount, you may be subject to a
When To File
Instruction 1040-X — Instructions for Form 1040-X, Amended U.S. Individual Income Tax Return · 2026-10-03 edition · updated 2026-10-04 · United States
File Form 1040-X only after you have filed your original return. You may amend your original return by filing Form 1040-X more than once, as long as each Form 1040-X is filed timely. Generally, for a credit or refund, you must file Form 1040-X within 3 years (including extensions) after the date you filed your original return or within 2 years after the date you paid the tax, whichever is later. If you filed your original return early (for example, March 1 for a calendar year return), your return is considered filed on the due date (generally April 15). However, if you had an extension of time to file (for example, until October 15) but you filed earlier and we received it on July 1, your return is considered filed on July 1. The time limit for filing a claim for credit or refund on a Form 1040-X can be suspended for certain people who are physically or mentally unable to manage their financial affairs. For details, see Pub. 556, Examination of Returns, Appeal Rights, and Claims for Refund.
After the due date for an original return has passed,
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