AMT (Alternative Minimum Tax)

Parallel tax system designed to ensure high-income taxpayers pay minimum tax. Fewer taxpayers are affected after recent tax law changes.

NII (Net Investment Income)

Investment income subject to the 3.8% Medicare surtax for high-income taxpayers. Includes interest, dividends, capital gains, and passive income.

NIIT (Net Investment Income Tax)

3.8% surtax on investment income for high-income taxpayers (income over $200,000 single/$250,000 MFJ).

PTC (Premium Tax Credit)

Refundable credit to help pay for health insurance purchased through the Marketplace. Amount varies based on income and family size.