After you file


@jvbrandt wrote:

an IRS letter states that I never placed my SS income on my taxes for 2020.


You didn't ask a question.  Are you wanting to ask how to get a copy of your 2020 return (the title of this thread)?   If so, see the answer I left for another user in this thread at the link below.

When you get your copy, you can then verify if you entered your SS income and if you entered it on the correct line.

 

https://ttlc.intuit.com/community/after-you-file/discussion/re-i-need-a-copy-of-my-2020-tax-return/0...