timeline for submit amended tax return
1 You usually have three years from the date you filed your original tax return to file Form 1040X to claim a refund. 2  You can file it within two years from the date you paid the tax, if that date is later.ou 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. 2  You must file an amended return on paper. 3  It canât be e-filed.