Why does turbo tax and mine and my husbands income together when calculating the additional medicare tax. Shouldn't it just be on the one that is over 300000.

[SweetieJean]

Where are you getting the $300,000 number?

[Cindy0H]

No, it is the combined amounts for a married filing jointly return. Form 8959 (Additional Medicare Tax) is used to figure the additional 0.9% percent Medicare tax on the portion of wages, self-employment, and railroad retirement income that exceeds a certain threshold ($200,000 for individuals, $250,000 for spouses filing jointly, and $125,000 for spouses filing separately).

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