Amending a return you have already filed

A reader who has spotted something wrong on a filed return wants to know what the correction route is.

Nothing here decides whether a return is due for you, what your status is, or who you may claim. Those turn on your own facts.

What the rules say

We do not work out anyone's tax, refund or balance. We explain what each rule asks for; the arithmetic belongs to you and to whatever you file with.

• A filed return is corrected by an amended return on the form the Service provides for that purpose, and the amendment states what changed and why.

The records this part asks for

• A copy of the return already filed for the year, where one was filed — A correction is made by reference to what was actually filed.

The forms involved, and what each one is

There are two different kinds of document here: ones you receive and copy from, and ones that are part of the return itself. They are easy to confuse and they behave nothing alike.

• Form 1040-X, Amended U.S. Individual Income Tax Return — amended return. Filing an amended return does not guarantee any particular outcome.

What we are not saying

• Not: that amending produces a refund.
• Not: that amending withdraws the original return.

Sources

Every source on this page shows the body that issued it and the date we read it. Amounts are stated for tax year 2025, and the text behind this centre was last read on 2026-08-16.

• Instructions for Form 1040-X, Amended U.S. Individual Income Tax ReturnInternal Revenue Service. Read for: Form 1040-X is used to correct a previously filed individual return, and the instructions state which changes it is used for. not year-scoped. Read on 2026-08-16.
• Amended return frequently asked questionsInternal Revenue Service. Read for: The IRS states that an amended individual return may be filed electronically for the years it supports, and describes the alternative paper route. not year-scoped. Read on 2026-08-16.

Where to go next

Educational information only. This is not tax advice, we are not your tax preparer, and nothing here is a determination about your own return. Check the linked official sources, and consider a professional for anything that turns on your specific facts.