generally just 1040-X, 1040, and all forms and schedules that changed. include payment if you owe but you can also pay through IRS website - selected amended return and year. iF paying by enclosed check make sure your SSN, tax year and a phone number or e-mail address is on it. use a method where you get proof of delivery since amended returns can only be mailed and be sure to read TT instructions as to proper mailing address. the IRS may send you a bill for any penalties and interest if you owe
