US Investment Tax
US Capital Gains Tax Calculator 2026
Estimate the federal tax on an investment gain before you sell. The key question is holding period: short-term gains are generally taxed as ordinary income, while long-term gains can use lower capital-gains brackets.
Official Standards & Rule Matrix
Holding periodShort-term vs long-term treatment
Filing statusSingle, married filing jointly, married filing separately or head of household
Other incomeAdd ordinary income to place the gain in the right bracket
ScopeFederal estimate; state tax and net investment income tax may add more
How to use this tool
- Enter the purchase price, sale price and any fees that adjust the basis.
- Select the holding period and your filing status.
- Add your other ordinary income so the calculator can place the gain in the correct bracket.
- Review the estimated federal tax and confirm state rules plus any 3.8% net investment income tax that may apply.
Computed completely in your browser. No personal data or numbers are transmitted over the network.
Frequently Asked Questions
- How long is long-term?
- For most assets, holding for more than one year qualifies for long-term capital-gains treatment. One year or less is generally short-term.
- Does this include the 3.8% net investment income tax?
- The core estimate focuses on federal capital-gains tax. The additional 3.8% NIIT can apply above certain modified adjusted gross income thresholds, so check it separately.
- What about losses?
- Capital losses can offset gains and, within limits, ordinary income. This calculator estimates a gain; use a tax professional for loss harvesting and carryforward rules.
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