Form 8959 for Additional Medicare Tax is automatically added to your tax return if your medicare wages (Box 3 on Forms W2) plus any self-employment income exceeds the following thresholds:
Married filing jointly $250,000
Married filing separately $125,000
Single $200,000
Head of household $200,000
Qualifying surviving spouse $200,000
If you believe that your income is below these amounts please double-check your W2 entries as well as the net income for self-employment, if applicable.
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