From www.IRS.gov
Did you discover that you made a mistake after you filed your federal tax return? You can make it right by filing an amended tax return.
Here are the top ten things to know about filing an amended tax return.
1. Use Form 1040X, Amended U.S. Individual Income Tax Return, to correct errors on your tax return. You must file an amended return on paper. It can’t be e-filed.
2. You usually should file an amended tax return if you made an error claiming your filing status, income, deductions or credits on your original …