Skip to content
PDFBetter
Upload

Internal Revenue Service (IRS) · United States (federal)

Form 1040-X: Amended U.S. Individual Income Tax Return

Current revision: Rev. December 2025 (checked on irs.gov, Oct 15, 2026)

Fill in IRS Form 1040-X (Rev. December 2025) to correct a filed 1040. Column A, B, C walkthrough, Part II explanation, signing and where to send it.

Filling needs no account. Downloading, printing or sending the completed form needs a free account — 3 downloads a month, no watermark.

Page reviewed

Form

1040-X

Issued by
Internal Revenue Service (IRS)
Applies in
United States (federal)
Edition
Rev. December 2025

Official source

PDFBetter is not affiliated with, endorsed by or acting for Internal Revenue Service (IRS). We open the form from irs.gov, and you fill it in our editor. Check the issuer's instructions before you file.

What it is

What Form 1040-X is for

Form 1040-X corrects a Form 1040, 1040-SR or 1040-NR you already filed — for missed income, deductions, credits or a wrong filing status. You show the original amounts, the change and the corrected amounts, and explain why. It can be e-filed with tax software or mailed, and you file a separate 1040-X for each year.

Fill it here

From irs.gov to your filled copy

  1. 1

    Fetched from irs.gov

    The agency's own, current PDF — not a retyped copy.

  2. 2

    Opens in the editor

    Fillable fields work as they are; on a flat page you type with text boxes.

  3. 3

    Your filled copy

    Download, print, sign or send it — the original stays untouched.

Who files it

  • Taxpayers who left out income, such as a late 1099
  • People who missed a credit or deduction, including the new 2025 deductions for tips or overtime
  • Anyone who used the wrong filing status or dependents
  • Taxpayers changing a return after an IRS adjustment

What you need

  • A copy of the original return as filed (or as last adjusted)
  • The new or corrected documents (W-2, 1099, receipts)
  • Any schedules or forms that change
  • Your explanation of each change

Line by line

How to fill out Form 1040-X

  1. 1

    Identify the year

    Enter the calendar or fiscal year you are amending at the top. Use a separate Form 1040-X for each year.

  2. 2

    Column A — Original

    Enter amounts from your original return, or from the return as previously amended or adjusted by the IRS.

  3. 3

    Column B — Net change

    Enter the increase or decrease for each line you're changing. Show decreases in parentheses.

  4. 4

    Column C — Correct amount

    Add or subtract column B from column A to get the corrected figures, then recompute tax, credits and payments.

  5. 5

    Refund or amount owed

    Lines near the end compare the corrected tax to what you paid or received to show a refund or a balance due.

  6. 6

    Part II — Explanation

    Explain each change and attach any schedules or forms that support it.

  7. 7

    Sign

    Sign and date. On a paper 1040-X the signature must be handwritten.

Where to send it

You can e-file Form 1040-X with tax software for Forms 1040, 1040-SR and 1040-NR. For paper filing, the address depends on your state and situation; see https://www.irs.gov/filing/where-to-file-addresses-for-taxpayers-and-tax-professionals-filing-form-1040-x. Generally file within 3 years after the original return was filed or within 2 years after you paid the tax, whichever is later, to claim a refund.

Filing rules change. Confirm the address or portal on irs.gov before you send.

Form 1040-X: questions people ask

Can I sign a paper 1040-X electronically?

No. The instructions say paper returns need a handwritten signature; digital, electronic and typed-font signatures aren't valid for a paper 1040-X. If you want to sign electronically, e-file it with software.

Do I need to amend for a math error?

Usually not. The IRS corrects math errors itself. Amend for changes to income, deductions, credits, filing status or dependents.

How long does processing take?

Amended returns take longer than original returns. Track status with the IRS “Where's My Amended Return?” tool about three weeks after filing.

Do I attach the whole original return?

No. Attach only the forms and schedules that changed, plus any new documents that support the changes.

Should I amend my state return too?

Often yes. Most states require an amended state return when your federal return changes. Check your state tax agency's rules.