I made a mistake on my federal return that I have already filed what can I do?
What you do depends on the type of mistake that you made:
Mathematical errors are usually caught in the processing of the tax return itself. 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 your income or did not claim a credit, you should file an amended or corrected return using Form 1040X, Amended U.S. Individual Income Tax Return. Continue reading