Rachel_W
Level 4

State tax filing

The additional federal withholding is most likely coming from Form 8959.  

If your wages are over $200,000 (Single, Head of Household), $250,000 (Married Filing Joint), or $125,000 (Married Filing Separate), you are subject to the Additional Medicare Tax.  The amount of Additional Medicare Tax your Employer already withheld is calculated in part V of Form 8959.  Line 24 of Form 8959 is added to your federal withholding amount on Line 16 of your Form 1040.

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