"My wife and I mailed in our taxes every year until this year(2021). "
If you have mailed your tax returns you have, in fact, "filed" tax returns. Filing does not just mean e-filing. It means you have either e-filed OR mailed a tax return to the IRS. And if you sent in a 2020 return last year there is an AGI on line 11 of that tax return. You may not be aware of it ---but you have an IRS account and you would be able to get a transcript of your past returns from the IRS.
https://www.irs.gov/payments/your-online-account
https://www.irs.gov/individuals/get-transcript
But.....your 2020 AGI might not be in the system yet since it took the IRS so long to process mailed 2020 returns and enter that information. Try using zero as your AGI if you are trying to e-file 2021.
**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.**
