You'll need to purchase the 2016 TurboTax CD/download and install it on your computer. 2016 is now considered a prior year's return and cannot be e-filed. It must be printed and mailed. See the linked information below for purchasing the 2016 software of your choice.
https://turbotax.intuit.com/personal-taxes/past-years-products/
If, by chance, you started your 2016 return in TurboTax online and want to access information you've already entered, you can follow the instructions below:
https://ttlc.intuit.com/replies/4186197
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
