Form 1040-X, Amended US Individual Income Tax Return
Filed a return and then found a mistake or a missed deduction? Form 1040-X is the official way to amend it. Fill in the genuine IRS PDF below and download it.
This is the genuine IRS PDF, unmodified. Source: IRS official page.
What is 1040-X?
Form 1040-X amends a previously filed 1040. Its three-column layout shows the original figures, the net change, and the corrected amounts, with Part III explaining why. You can claim a missed credit, fix reported income, or change your filing status where allowed.
To claim a refund, file it within three years of the original filing date or two years of paying the tax, whichever is later. Amended returns can take up to 16 weeks to process, and the IRS "Where’s My Amended Return" tracker follows it.
Who files 1040-X?
- Taxpayers who received a corrected W-2 or 1099 after filing
- People who missed a deduction or credit they were entitled to
- Anyone needing to change filing status, dependents, or income on a filed return
- Not needed for plain math errors: the IRS corrects those on its own
How to fill out 1040-X
- Enter the tax year you are amending at the top.
- Copy your original amounts into column A, the corrected amounts into column C, and the differences into column B.
- Explain each change clearly in Part III.
- Attach any schedules or forms the change affects.
- Download, sign, and mail it with attachments, or use it to prepare an e-filed amendment through your software.
Quick fill 1040-X on this page
Prefer to see the form itself while you type? Open 1040-X in the editor to fill it on the actual pages, add a signature, and download.
Frequently asked questions
Can a 1040-X be e-filed?
Yes, amendments for recent tax years can be e-filed through tax software. Paper filing remains available and is required for some older years.
Will amending trigger an audit?
An amendment is reviewed like any return. Clear explanations in Part III and matching documentation are what keep processing smooth.