Short- and long-term gains with a cost-basis helper.
Open the Capital Gains tool →Short-term gains (assets held a year or less) are ordinary income, so we stack them on your other taxable income and tax them at your marginal brackets. Long-term gains (held more than a year) get the preferential 0%, 15%, and 20% rates, stacked on top of everything beneath them, so the bracket a long-term dollar lands in depends on your ordinary income first.
If your modified AGI is high enough, the Net Investment Income Tax adds 3.8% on the smaller of your net investment income or the amount above the threshold for your filing status. Enter a single lot as proceeds minus cost basis to get the gain; a full FIFO / specific-identification lot picker is on the way. Net losses aren't modeled here, enter net gains.
Computed entirely on your device for U.S. taxes and benefits. Nothing is ever sent anywhere, and it is free forever. Educational information, not financial, tax, investment, or legal advice.