After you file

Or check W2 box 12. You may have entered Code A by mistake. There could be a problem if you accidentally typed Code A in for box 12. Maybe you entered an extra box 12 with code A or you put an A instead of the D. That can happen if you mistake the box 12 label for the Code letter.

 

Is the total of box 4 (only box 4 not box 6) on all your 2019 W2s for Social Security more than $8,239.80?  Then send the IRS copies of all your W2s.