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Instructions for Form 1040-X›(Rev. December 2025)

! are electronically filing Form 1040-X to amend Form

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 1040-NR, you must complete the Form 1040-X in its

entirety.

If you file Form 1040-X claiming a refund or credit for

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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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