Capital Gains Tax Calculator

A capital gains tax calculator is a financial tool that estimates the tax liability on gains from selling capital assets such as stocks, bonds, real estate, cryptocurrency, and other investments. It takes your cost basis (what you paid for the asset plus transaction fees), the sale price, the holding period, and your annual income to compute the gross capital gain, determine whether it is short-term or long-term, apply the appropriate tax rate based on your jurisdiction, subtract any applicable exemptions, and calculate the final tax owed and net proceeds after tax. Our capital gains tax calculator supports tax rules for the United States, United Kingdom, India, Australia, Canada, and Singapore - all processing locally in your browser with no data uploaded to any server.

1. Enter Asset & Transaction Details: Input your cost basis (the original purchase price including commissions and fees), the sale price, and any transaction fees (brokerage, legal, exchange fees). The capital gains tax calculator adds fees to your cost basis to determine the adjusted cost basis, then subtracts it from the sale price to calculate your gross capital gain or loss.
2. Set Holding Period & Income:Enter how many months you held the asset before selling. The calculator automatically classifies the gain as short-term or long-term based on your jurisdiction's threshold (e.g., 12 months for US long-term classification). Enter your annual taxable income to determine the correct marginal tax bracket for short-term gains and the applicable long-term capital gains rate.
3. Review the Complete Tax Breakdown: The calculator displays the gross gain, holding period classification, effective tax rate, any tax-free exemption applied, the tax owed, and your net proceeds after tax. A visual cost-basis comparison shows how different accounting methods (FIFO, LIFO, Specific ID, Average Cost) would affect your taxable gain.

• Short-Term vs Long-Term:Most jurisdictions differentiate between short-term gains (assets held for a short period, typically less than 12 months) and long-term gains (held longer). Short-term gains are usually taxed at ordinary income tax rates, while long-term gains receive preferential tax treatment. The capital gains tax calculator automatically applies the correct classification based on your jurisdiction's holding period threshold.
• Cost Basis: The original value of an asset for tax purposes, usually the purchase price plus any commissions, fees, and improvements. A higher cost basis reduces the taxable gain. Different accounting methods (FIFO, LIFO, Specific Identification, Average Cost) can produce different cost basis amounts for identical portfolios, significantly affecting tax liability.
• Tax-Free Exemptions: Many jurisdictions offer exemptions that reduce or eliminate capital gains tax in certain situations. The UK offers a £3,000 annual tax-free allowance. India exempts LTCG up to ₹1 lakh on listed equities. Australia offers a 50% CGT discount for assets held over 12 months. The US provides a $250,000/$500,000 primary residence exclusion.
• Net Investment Income Tax: In the US, high-income earners (over $200,000 single / $250,000 married) may be subject to an additional 3.8% Net Investment Income Tax (NIIT) on top of their regular capital gains tax rate. The capital gains tax calculator automatically includes NIIT for applicable income levels.

The capital gains tax calculator produces analytical estimates based on current tax rules for the supported jurisdictions - it is not a substitute for professional tax advice. Tax laws change frequently, and individual circumstances (offsetting losses, AMT, state/local taxes, foreign tax credits, and special asset types) can significantly affect your actual tax liability. The cost basis method comparison provides illustrative estimates only - actual FIFO/LIFO calculations depend on specific lot purchase dates and prices. All calculations run entirely client-side in your browser - no data is sent to any server, no signup required, and no financial information ever leaves your device. Consult with a qualified tax professional before making decisions based on these estimates.