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Internal Revenue Service

Fill out Form 1040-X online

Amended U.S. Individual Income Tax Return

Form 1040-X is used to correct a Form 1040, 1040-SR or 1040-NR that you have already filed, or to change amounts the IRS previously adjusted. It shows the original amounts, the change and the corrected amounts, and asks you to explain why you are amending. You file a separate Form 1040-X for each tax year you are changing.

Fill out Form 1040-XBlank form from the IRS

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Edition
Rev. December 2025
Pages
2
Fillable fields
166
Checked against the IRS
November 8, 2026

GuruPDF is not affiliated with the Internal Revenue Service. This page explains the form in plain words; it is not legal or tax advice. Always check the official instructions before you file.

Who uses Form 1040-X

  • People who need to correct income, deductions, credits or filing status on a return they already filed
  • Taxpayers changing amounts that the IRS previously adjusted
  • People claiming a carryback of a loss or an unused credit
  • People making certain tax elections after the deadline
  • A surviving spouse or personal representative amending a deceased person's return

Before you start

  • A copy of the return you are amending, with its schedules, forms and worksheets
  • Any IRS notices about changes the IRS made to that return
  • New or corrected documents, such as an additional or corrected Form W-2 or Form 1099-R
  • The instructions for the tax return of the year you are amending
  • Social security numbers (or ITINs) for you, your spouse and each dependent
  • A completed, updated Form 1040, 1040-SR or 1040-NR showing your changes, which must be attached to a paper Form 1040-X

How to fill out Form 1040-X

  1. Top of page 1: year, names and address

    Enter the calendar year (or the month and year a fiscal year ended) of the return you are amending. Enter your name and SSN, and your spouse's if it is a joint return, in the same order as on the original return. Use your current address. Check the Presidential Election Campaign box only if you, or your spouse on a joint return, did not choose to give to the fund before but now want to; it does not change your tax or refund. If this is a carryback claim, or the return is for a deceased taxpayer, the instructions say to write "Carryback Claim", or "Deceased" with the name and date of death, at the top of page 1.

  2. Amended return filing status

    Check one filing status box, even if you are not changing it. If you check married filing separately, enter your spouse's name, unless you are amending a Form 1040-NR. If you check head of household or qualifying surviving spouse and the qualifying person is a child who is not your dependent, enter the child's name. In general, you can't change from married filing jointly to married filing separately after the return due date.

  3. How columns A, B and C work

    Column A is the amount from your original return, or the amount after a previous amendment or IRS change. Column B is the increase or decrease, and every change must be explained in Part II. Column C is the corrected amount (A plus or minus B); for a line you are not changing, copy column A into column C. Show negative amounts in parentheses. The instructions have a chart of which lines to complete; for example, if you are only changing payments or refundable credits, you complete lines 11 through 23.

  4. Lines 1–11: income, deductions and tax

    Line 1 is adjusted gross income (check the box if a net operating loss carryback is included). Line 2 is itemized or standard deduction, line 4a the qualified business income deduction, and line 4b the deductions for tips, overtime, car loan interest and seniors from Schedule 1-A (attach it). Line 5 is taxable income; if column C is zero or less, enter -0-. On line 6, enter the tax and the method used (such as Table, TCW or QDCGTW). Line 7 is nonrefundable credits, line 9 is reserved, line 10 is other taxes and line 11 is total tax.

  5. Lines 12–23: payments, refund or amount you owe

    Lines 12 to 15 cover withholding, estimated tax payments, the earned income credit and refundable credits (check the boxes for the forms that apply). Line 16 is tax paid with an extension request, with the original return and after filing, without interest or penalties. Line 17 is total payments and line 18 is the overpayment shown on the original return or as adjusted by the IRS. Line 20 is the amount you owe; lines 21 to 23 show an overpayment and how much you want refunded or applied to estimated tax for the year you enter.

  6. Part I: Dependents (lines 24–30)

    Complete Part I if you are changing any information about your dependents, including their number. Lines 25 and 27 show the number of dependent children who lived with you and other dependents, in columns A to C; lines 24, 26, 28 and 29 are reserved. On line 30, list all dependents claimed on this amended return, both those already claimed and those you are adding, with name, SSN, relationship and the boxes for residence, student or disability status and credits. If you have more than four dependents, check the box and see the instructions.

  7. Part II: Explanation of changes, then sign

    Part II must be completed. Explain why you are filing, for example that you received another Form W-2 or are changing your filing status, and attach a statement if you need more space. Then sign and date the form and enter your occupation. If the IRS sent you an Identity Protection PIN, enter all six digits. Generally, a paid preparer must also sign and enter their PTIN; someone who prepares it without charging you should not sign.

After you fill it out

A paper Form 1040-X is mailed to the IRS. Place the completed, updated Form 1040, 1040-SR or 1040-NR behind it, followed by any new or changed schedules and forms; attach copies of supporting Forms W-2, W-2c or 2439 (and W-2G or 1099-R if tax was withheld) to the front. If you are responding to an IRS notice, use the address in the notice; otherwise check the filing address that applies to you in the official instructions. If you owe tax, see the payment options on the official IRS payments page.

Signing: The instructions say you must handwrite your signature on a paper-filed Form 1040-X, and that digital, electronic or typed signatures are not valid on paper, so print the form and sign it in ink. For an amended joint return, both spouses must sign.

Watch out for

  • A paper Form 1040-X must have a completed, updated Form 1040, 1040-SR or 1040-NR with your changes attached. The instructions also say a Form 1040-X sent without all appropriate forms and schedules will be returned.
  • If you are amending Form 1040-NR on paper, or switching between Form 1040 and 1040-NR, the instructions say to enter only your name, current address and SSN or ITIN on page 1, skip Part I, explain in Part II, and attach the corrected return with "Amended" written across the top.
  • Don't use Form 1040-X to ask only for a refund of penalties and interest (use Form 843), or to request your share of a joint refund that was applied to your spouse's past-due debt (use Form 8379).
  • Claiming a refund or credit for more than the correct amount can bring a penalty of 20% of the disallowed amount, unless you had reasonable cause.

Questions about Form 1040-X

How long do I have to file Form 1040-X for a refund?

Generally, you must file within 3 years after the date you filed the original return or within 2 years after the date you paid the tax, whichever is later. A return filed early is treated as filed on the due date. Special rules apply to carrybacks, bad debts, foreign tax credits, disasters and combat zones.

Do I always need to amend if I find a mistake on my return?

Not always. The IRS says it may correct certain errors and may accept a return without certain required forms or schedules, and in those cases you don't need to amend. File Form 1040-X if your filing status, income, deductions, credits or tax liability changes.

Can Form 1040-X be filed electronically?

The IRS accepts an electronic Form 1040-X through tax filing software for the current and two prior tax periods. Returns for older years, and amendments to a prior-year return that was filed on paper during the current processing year, must be filed on paper.

Can my refund from a paper Form 1040-X be direct deposited?

No. The instructions say a refund on a paper-filed amended return is sent as a check. Direct deposit is available only on an electronically filed Form 1040-X for tax year 2021 or later.

How do I check the status of my amended return?

Use the IRS Where's My Amended Return? tool. You need your SSN, date of birth and ZIP code. A return does not show up in the tool right away; the IRS page says when it will and gives current processing times.

Official information

Page text last reviewed November 7, 2026.

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