What the term means
An amended federal tax return is a correction to a previously filed Form 1040, 1040-SR, or 1040-NR. Individuals generally make the correction with Form 1040-X, Amended U.S. Individual Income Tax Return.
What Form 1040-X changes
The form can correct filing status, income, deductions, credits, dependents, payments, or tax liability; change amounts previously adjusted by the IRS; make certain permitted elections; or make certain carryback claims. The corrected return must use the forms, schedules, instructions, and tax rules for the year being amended.
What it does not automatically do
An amendment does not automatically stop collection, extend an appeal or court deadline, or replace a response required by an IRS notice. It also does not eliminate interest or penalties that apply to additional tax from the original due date.
Form 1040-X compared with related forms
- Form 843: generally used for a refund or abatement request limited to paid penalties, interest, or certain other amounts.
- Form 8379: generally used for an injured spouse allocation of a joint overpayment.
- Audit reconsideration: a request to reevaluate certain closed examination assessments using new or unconsidered information.
- Appeals protest: a challenge to proposed IRS action under the deadline and instructions in a notice.
Example
A taxpayer files a 2025 Form 1040 and later receives a corrected Form W-2 that changes wages and withholding. The taxpayer prepares a 2025 corrected Form 1040, the current Form 1040-X, and every affected schedule, explains the change, and files through an authorized electronic or paper channel.