If you discover a mistake on your tax return after you've already filed it, don't panic. In most cases, all you have to do is file an amended tax return. What Tax Form is Used to File an Amended Return? Taxpayers should use Form 1040X, Amended U.S. Individual Income Tax Return, to file an amended (corrected) tax return. An amended tax return should only be filed to correct errors or make changes to your original tax return. For example, you should amend your return if you need to correct your...

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