When paper-filing IRS Form 1040-X Amended U.S. Individual Income Tax Return, it is important to attach any forms or schedules used to figure the revised tax.
As it is not possible for the program to know which forms or schedules those may be, it is up to the taxpayer to print and send them with the amendment.
In the amendment section of the Q&A, on the screen titled Amended Return - Mail Form 1040-X, the first paragraph states "Mail Form 1040-X and any accompanying documents to the Internal Revenue Service Center for the place where you live."
To view this screen in your TaxAct® return:
Note that any link in the information above is updated each year automatically and will take you to the most recent version of the document at the time it is accessed.