Skip to content
ChatProjectCodes

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

!

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 can’t change your election to apply part or all of the overpayment on line 21 to next year's estimated tax.

Get a plain-English answer with a citation back to this text.

Ask AI about this code
Export this section
▸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

GoCodebook provides public access, search, citation, multilingual explanation, and practical interpretation of legally adopted building regulations. It is not a substitute for the official ICC or California code publications.