You may be subject to the NIIT if you have net investment income and your modified adjusted income exceeds:
- $200,000 if you’re single or filing as head of household
- $250,000 if you’re married filing jointly or as a qualified widow(er) with dependent child
- $125,000 if you’re married filing separately
The NIIT is based on the lesser of your net investment income or the amount by which your modified adjusted gross income exceeds the applicable threshold listed above for your filing status. Form 8960 is used to calculate the NIIT.
Credit Karma Tax will automatically calculate the NIIT to determine how much you owe. If you need to make any adjustments to your net investment income, you can enter the amounts on the Net Investment Income Tax screen.