After you file

Amendment to a 2021 Return :(

Hi --- as fate would have it when I was doing my 2022 Taxes I found a mistake I made last year on my 2021 taxes.  And of course it is not in my favor.  :(  I have a few questions.

 

1)  Can I go back to Turbo Tax 2021 (which I still have loaded on my computer) to fix/Amend the return?  Or do I need to do it all in Turbo Tax 2022 ?

 

2)   At this point I used Turbo Tax 2021 to fix/Amend my 2021 Tax return.  Assuming that I can use Turbo Tax 2021 to Amend my return ... can I use Turbo Tax 2021 to eFile it ?  Or do I need to do via paper/Mail  ?

 

3) Seeing that I just found this Mistake when doing  my 2022 taxes ...... isn't  there a penalty that I need to add on since it is a year after the fact ?  if so How do I determine the Penalty ?  Turbo Tax did not tell me the penalty fee ?

 

Thank you