. . . Or you could have made a mistake entering an amount in box 5 of a W-2. Check your entries for box 5 and box 6 of each W-2. Look for missing or transposed digits, extra digits, misplaced decimal point, etc. Compare the actual W-2 from each employer to what's in TurboTax.
Form 8959 line 24 is just a total. We can't tell anything from that. If you can't find an entry error, we will have to dig into the details of the form.
Is this for 2020 or 2021? Did you e-file your tax return or file by mail?
Do you have any less common situations that would affect your Medicare tax, such as unreported tips (Form 4137), 1099-MISC or 1099-NEC income that should have been reported on a W-2 (Form 8919), or RRTA compensation in W-2 box 14?
