E-file of prior year returns

[Jtax LLC]

I have a client who is wanting to file 2017-2021 returns.  Does anyone know how far back I can e-file without having to mail them in?  I know the e-file opens back up on 1/24/22, but how far back can you e-file after it opens?  He's a Tennessee resident so it would be just federal.

[IRonMaN]

Three years are open at a time so - 2021, 2020, and 2019

[hankinstax]

You can file the current year plus two.  In other words, 2021. 2020 and 2019.  Anything else has the be mail via "snail mail".

[IRonMaN]

Beat you by 8 seconds.  But close only counts in horseshoes and hand grenades.😁

[Accountant-Man]

Everybody knows, because knowing is part of our professional responsibility.