If you used the desktop version of TurboTax and did not save a copy of your .tax file to your computer or an external drive, then you will have to enter this information manually into the program.

This information is only stored on the computer in which the return was filed, unless backup copies are made elsewhere. If you have a backup of your .tax2015 file, you can load your return into TurboTax that way for 2016 and all the information will pull over to the new return, otherwise, you'll have to re-create your return.

If you have the .tax file from 2015, please see these instructions for starting your 2016 return: https://ttlc.intuit.com/replies/3302290