If you have someone prepare your amended return, you are still responsible for the correctness of the amended return. If your amended return is.Be advised – you can't e-file an amended return. To claim a refund, you must file an amended return within 3 years after the date you filed your original return or 2 years after the date you paid the tax. See Specific Instructions, later, for information on completing Form 1065X as an amended return. Note. See Specific Instructions, later, for information on completing Form 1065X as an amended return. Note. There is a section on the 1040X where you must put in an explanation for the amendment. I'm not sure anyone will read the letter. IRS changes any of these items, report these changes to the. See Instructions on How to Complete a Tax Return Amendment Form 1040X or 1040-X.