Capital Gains Tax Calculator

When you sell an investment for more than you paid, that profit is a capital gain — and how it's taxed depends heavily on how long you held the asset. The difference between short-term and long-term treatment can change your tax bill on the same dollar of profit substantially, which is why holding period is one of the simplest levers investors have to manage their tax bill.

This calculator walks through multiple transactions at once, automatically classifying each as short-term or long-term based on the dates you enter, and layers in the Net Investment Income Tax and state tax where applicable.

Enter ordinary AGI before sales, your allowed deductions, filing status, and each investment transaction's purchase price, sale price, quantity, and dates. The calculator computes your holding period for each transaction, taxes net short-term gains across ordinary tax brackets and net long-term gains across the 0/15/20% brackets for your selected tax year, adds 3.8% NIIT on the lesser of net gain or MAGI excess, and applies your state rate — showing your total tax, after-tax gain, and the savings from long-term treatment.