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Instructions for Form 1040-X›Notice 2023-21. For the following affected taxpayers, Notice

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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

CAUTION

You must attach all appropriate forms and schedules to Form 1040-X or it will be returned.

Many amended returns deal with situations that have special qualifications or special rules that must be followed. The items that follow give you this specialized information so your amended return can be filed and processed correctly.

Only the special procedures are given here. Unless

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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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