I got the form 3531 for the year 2020.  I realized I did the same thing for this year too.  Can I go ahead and send a signed return for this year along with the W2s or should I wait to get a 3531 in the mail for 2021.  I'm not sure how this will effect my 1040 X I filed last month for 2021.  I figured if I could fix my error before getting a notice would help.  Thanks for any insight.