stocktax.tools

U.S. stock & equity-comp tax calculators

Free, fast, bilingual calculators for the taxes that trip up stock investors and employees with RSUs, ESPP and options — your numbers never leave your browser.

RSU Tax Calculator New
Vesting tax, your real cost basis and the withholding gap — avoid being double-taxed when you sell.
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ESPP Tax Calculator New
Qualifying vs disqualifying disposition, the 15% discount and your true after-tax profit.
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ISO + AMT Calculator New
Stock-option exercise tax and the Alternative Minimum Tax trap on incentive stock options.
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NSO Tax Calculator New
Ordinary income and FICA when you exercise non-qualified stock options, plus your real cost basis.
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Capital Gains Tax New
Short- vs long-term tax on stock gains, plus W-8BEN dividend withholding for non-residents.
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Why stocktax.tools

Stock taxes are where good investors quietly lose money — to a 22% withholding shortfall, a broker's $0 cost basis, or selling one day before the long-term line. These calculators turn each of those traps into a clear number, in plain English and 中文.

Who it's for

Retail investors selling U.S. stocks, and employees at U.S. companies holding RSUs, ESPP or options — including Chinese-speaking investors who can't find clean tools in their own language. Everything is free, runs in your browser, and never stores your data.

Not tax advice

Every tool here is an educational estimate, not tax advice. Tax depends on your full situation and current law — confirm with a qualified professional before acting.