Can I file 2019

A 2019 return cannot be prepared in Online TurboTax.    The website is currently only for 2021 returns.   Do NOT try to prepare and file a 2019 return using the Online website.  

If you want to use TurboTax to prepare a 2019 return, you'll need to use 2019 desktop software (CD/download).   You can purchase 2019 desktop software directly from TurboTax as a download at this page and install it on your computer:

https://turbotax.intuit.com/personal-taxes/past-years-products/2019

The 2019 return cannot be efiled.  It will need to be printed, signed, dated, and mailed.  It's a good idea to mail by a method that has tracking, such as certified mail, priority mail, etc.

If you have both Federal and state returns, you need to mail each one separately to its respective tax agency. 

Minimum system requirements for Windows version:
https://ttlc.intuit.com/questions/1901571-minimum-system-requirements-for-turbotax-windows-software

Minimum system requirements for Mac version:
https://ttlc.intuit.com/questions/1899173-minimum-system-requirements-for-turbotax-mac-software