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Instructions for Form 1040-X›(Rev. December 2025)›! more than the correct amount, you may be subject to a

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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

Use these instructions with both the paper-filed Form 1040-X and the electronically filed amended return.

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▸Contents — Instruction 1040-X — Instructions for Form 1040-X, Amended U.S. Individual Income Tax Return
Instruction 1040-X — Instructions for Form 1040-X, Amended U.S. Individual Income Tax Return

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