High earners owe an extra 3.8% on investment income. See if it applies to you and how much.
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NIIT owed
3.8% surtax
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The Net Investment Income Tax is 3.8% of the smaller of your net investment income and the amount your modified AGI exceeds the threshold (200,000 single, 250,000 married filing jointly). It applies on top of regular income and capital gains tax. Simplified estimate.