401(k) Overcontribution

Hi there,

 

I overcontributed to 401(k)s in 2021 due to a job change.

I received a 1099-R for '2022', and I reflected the corrective distribution/income in my already-filed 2022 tax return and I paid tax on it.

 

Now, I wish to amend 2021 to fully fix this issue. I believe my AGI in 2021 was too low (by the amount of the over-contribution listed on 2022's 1099-R form (note: box 2a = box 1, and box 7 = P).

 

Can you please explain to me how I can properly amend 2021 in Windows Desktop (step by step) and fully resolve this overcontribution to 401k issue? 

 

Thank you so much!

Leo