In order to prepare a 2020 state return you will need the CD/download software for 2020---it is not possible to use online for a 2020 return. If you used TT for your 2020 federal return you can download the 2020 desktop software to a full PC or Mac--not to a mobile device or phone.
https://ttlc.intuit.com/questions/1900990-how-do-i-file-a-prior-year-tax-return
And...the 2020 return will have to be printed and mailed. It cannot be e-filed.
**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.**
