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Free Capital Gains Tax Calculator Online
Capital Gains Tax Calculator estimates federal tax on an asset sale — short-term vs long-term — stacked on your other income, including the 3.8% NIIT and state tax.
Capital Gains CalculatorStock Sale Tax CalculatorLong Term Capital Gains TaxInvestment Tax Calculator
Interactive Capital Gains Tax Calculator Workspace
Process your files or inputs directly in your browser. Many workflows run locally; features that need network data or a service are identified on their tool page.
At a glance
Capital Gains Tax Calculator — Capital Gains Tax Calculator estimates federal tax on an asset sale — short-term vs long-term — stacked on your other income, including the 3.8% NIIT and state tax.
Free for the core workflow, no account required. The calculation is performed locally in the browser from the values you enter.
About Capital Gains Tax Calculator
Capital Gains Tax Calculator estimates federal tax on an asset sale — short-term vs long-term — stacked on your other income, including the 3.8% NIIT and state tax.
Assets held over a year qualify for preferential long-term rates (0%, 15%, 20% for 2026) applied on top of your other taxable income; short-term gains are taxed as ordinary income. The calculator layers your gain onto existing income to find the right bracket, adds the net investment income tax above the thresholds, and includes an optional state rate. Calculator results depend on the inputs, units, assumptions, formulas and reference date or rate where applicable. Confirm units and assumptions, compare the result with a known example when possible, and verify current external rates or rules.
Primary objective: Estimate federal tax on an asset sale for short-term and long-term holding periods, stacked on other income with NIIT and state tax.
Privacy assurance: The calculation is performed locally in the browser from the values you enter.
How to Use Capital Gains Tax Calculator
- Enter purchase price, sale price, and holding period.
- Add filing status, other taxable income, and state rate.
- Review federal tax, NIIT, state tax, net proceeds, and effective rate.
- Define the result you need from Capital Gains Tax Calculator before choosing options or entering data.
- Use a small representative input for the first run so you can confirm that the settings match the intended capital gains tax calculator workflow.
- Review the result against the original input or expected format before copying, downloading, publishing or sharing it.
Key Use Cases & Applications
- Stock sale tax estimates
- Property sale planning
- Timing a sale across tax years
- Use Capital Gains Tax Calculator for estimating a value from known inputs.
- Use Capital Gains Tax Calculator for comparing scenarios before making a decision.
- Use Capital Gains Tax Calculator for checking a calculation without installing dedicated software.
Frequently Asked Questions
What counts as long-term?
Holding the asset more than one year before selling. One year or less is short-term.
What is the NIIT?
A 3.8% net investment income tax on investment gains above $200,000 single or $250,000 married filing jointly.
Do losses offset gains?
Yes — capital losses offset gains, and up to $3,000 of net loss can offset ordinary income per year.
How are RSUs and crypto taxed?
RSUs are taxed as ordinary income at vesting; later appreciation is capital gain. Crypto follows the same short/long-term capital gain rules as stocks.
What should I check before using the Capital Gains Tax Calculator result?
Confirm units and assumptions, compare the result with a known example when possible, and verify current external rates or rules. The result is a mathematical model based on the supplied inputs and assumptions.
Does Capital Gains Tax Calculator replace a professional or authoritative source?
No. Capital Gains Tax Calculator is a practical utility. Where the result affects a regulated, financial, medical, legal or business decision, verify it against the appropriate authoritative source or qualified professional.