The Additional Medicare Tax withholding would come from Form 8959 line 24.
One note of caution, if you accidently entered too much Medicare tax withholding when you entered a W2 form, you might see this entry, but it would be an error.
I recommend checking all of the W-2 forms entered on your tax return. check box 6 to make sure it matches your copy.
To review your W2 forms:
- Select Federal on the left side menu.
- Select Wages and Income toward upper left.
- Click Edit to the right of Job (W2).
- Keep going until you get to the screen, Now let's update the rest.
- Check box 6 for accuracy.
- Repeat with all of your W2 forms.
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