Prior year tax returns can never be mailed using TurboTax. Go to the file section and choose the option to file by mail in step 1. When you print the return, a sheet of filing instructions will print with the return for what to include and maybe where to mail it. If you need help finding where to mail it, use this link: https://www.irs.gov/uac/where-to-file-paper-tax-returns-with-or-without-a-payment?_ga=1.31357439.177...
CORRECTION: Prior year tax returns can never be efiled using TurboTax. TurboTax does not mail your return for you. You must print and mail it yourself.
