After you file

No, you cannot.  When TurboTax re-opens in December, it will only be for 2017 returns.  Online software for 2016 is shut down permanently.  You have to use desktop software to complete your 2016 return, which has to be printed, signed and mailed now.

**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**