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Amended Returns & Form 1040X

Question: What should I do if I made a mistake on my federal return that I have already filed?

Answer:

It depends on the type of mistake that you made:

  • Many mathematical errors are caught in the processing of the tax return itself so you may not need to correct these mistakes.
  • If you did not attach a required schedule, the IRS will contact you and ask for the missing information.
  • If you did not report all of your income or did not claim a credit, you should file an amended or corrected return using Form 1040X (PDF), Amended U.S. Individual Income Tax Return.

When filing an amended or corrected return:

  • Include copies of any schedules that have been changed or any Form(s) W-2 (PDF) you did not include. File 1040X only after you have filed your original return. Generally, for a credit or refund, you must file Form 1040X within 3 years (including extensions) after the date you timely filed your original return or within 2 years after the date you paid the tax, whichever is later.
  • Please allow the IRS 8-12 weeks to process an amended return.

Additional Information:


Category: IRS Procedures
Subcategory: Amended Returns & Form 1040X

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The OMB number for this study is 1545-1432.
If you have any comments regarding this study, please write to:
IRS, Tax Products Coordinating Committee
SE:W:CAR:MP:T:T:SP
1111 Constitution Avenue NW
Washington, DC 20224