1040-X form: fill out and sign online, free to start
Form 1040-X is the Internal Revenue Service's “Amended U.S. Individual Income Tax Return.” In its words: “File Form 1040-X to: Correct Form 1040, 1040-SR, or 1040-NR (or older filings of Form 1040-A or 1040-EZ).” (IRS, About Form 1040-X)
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Also searched as: 1040X, 1040-X, Form 1040-X, 1040X form, amended tax return form, Amended U.S. Individual Income Tax Return.
1040-X at a glance
| Agency | Internal Revenue Service (IRS) |
|---|---|
| What it is for | File Form 1040-X to: Correct Form 1040, 1040-SR, or 1040-NR (or older filings of Form 1040-A or 1040-EZ). |
| Who fills it | The taxpayer who is amending a return, as the form is laid out. |
| Who it goes to | See the IRS instructions for Form 1040-X. The IRS page says you can file electronically with tax filing software, and that paper filing is still an option. |
| Signature | The form has a Sign Here section, with a declaration under penalties of perjury. |
| Revision | Rev. December 2025 |
| Last checked | |
| Official form and instructions | Official form (PDF) · Official instructions |
For what to enter on each line, read the agency's instructions.
How to fill out the 1040-X with PDFinish
Open the form. Press Fill it now. The form opens in Finish PDF in your browser. Nothing is uploaded.
Type in the boxes. Click a box and type, or tick a checkbox. Add your signature in the Sign step and press Lock to put your entries into the page.
Save your copy. Name the file and download it. Your original blank form is never changed.
Questions about the 1040-X form
Is the 1040-X form free to fill out here?
Free to start. Your 2 free uses in total need no account. Filling in a form and signing it are free; the file you download counts as one of your free uses. After that, start your 7-day free trial of Pro or buy Pro for $2.99 a month.
Is my information uploaded?
No. The form is filled in your browser and never uploaded, so what you type, including any Social Security number or other tax ID, stays on your device. We do not record what you type.
Is this the latest version of Form 1040-X?
It is the version the agency listed as current when we last checked on 2026-10-26: Rev. December 2025. We compare our copy with the agency's every week. If the agency updates the form, this page says so and points to the official link until we update ours.
Can I sign the 1040-X electronically?
Whether an electronic signature is accepted is up to whoever asked you for the form, unless the agency says otherwise. Check the agency's instructions at https://www.irs.gov/instructions/i1040x. PDFinish places a picture of your signature on the page; it is not a certificate-based digital signature.
Where do I send the 1040-X?
In the agency's words: See the IRS instructions for Form 1040-X. The IRS page says you can file electronically with tax filing software, and that paper filing is still an option. Read the agency's instructions at https://www.irs.gov/instructions/i1040x.
What do I put in each box of the 1040-X?
We do not tell you what to enter. The agency's own instructions explain each line: https://www.irs.gov/instructions/i1040x.
Related forms
- 4868 form: Application for Automatic Extension of Time To File U.S. Individual Income Tax Return
- 843 form: Claim for Refund and Request for Abatement
- 8962 form: Premium Tax Credit (PTC)
- All forms
- Our own fillable templates
Sources
- IRS, About Form 1040-X: irs.gov/forms-pubs/about-form-1040-x (checked October 26, 2026)
- Official form (PDF): irs.gov/pub/irs-pdf/f1040x.pdf (checked October 26, 2026)
- Official instructions: irs.gov/instructions/i1040x (checked October 26, 2026)
PDFinish is not affiliated with the IRS or any government agency. The forms are the agency's own, unchanged.
General information, not tax, legal or immigration advice.