Capital Gains Tax Calculator — Short vs. Long Term (2026 Brackets)

The Formula

Capital gains tax is calculated based on the holding period (short-term vs. long-term), your total taxable income, and filing status. Short-term gains are taxed at ordinary income rates, while long-term gains benefit from preferential rates of 0%, 15%, or 20%. An additional 3.8% Net Investment Income Tax (NIIT) may apply for high-income taxpayers.

Variable Definitions

How to Use This Calculator

1. 1

   Select the asset type (stocks, bonds, crypto, real estate, or collectibles).

2. 2

   Enter the purchase and sale dates to calculate the holding period.

3. 3

   Enter your cost basis (what you paid) and sale proceeds.

4. 4

   Provide your annual ordinary income and filing status to determine the correct tax bracket.

5. 5

   Optionally enter your state capital gains tax rate for a complete picture of your tax liability.

Common Applications

• Estimate your federal and state capital gains tax liability before selling stocks, real estate, or other appreciated investments.
• Compare the tax impact of short-term versus long-term holding periods to decide the optimal time to sell an asset.
• Plan tax-loss harvesting strategies by modeling how realized gains and losses offset each other in a given tax year.
• Evaluate the after-tax return of an investment sale to make informed decisions about portfolio rebalancing.

Long-term gains (held >365 days) get preferential rates. Short-term gains are taxed as ordinary income. NIIT adds 3.8% above income thresholds.

Understanding the Concept

Capital gains tax is one of the most important considerations for investors when selling assets. The tax treatment depends primarily on how long you held the asset before selling. Short-term capital gains (assets held for 365 days or less) are taxed as ordinary income at your marginal tax rate, which can be as high as 37%. This is a significant tax disadvantage compared to long-term gains, which benefit from preferential rates of 0%, 15%, or 20% depending on your income level. The difference is substantial: a high-income earner in the 37% bracket pays nearly twice the tax on short-term gains compared to long-term gains. This tax preference is a key reason why financial advisors recommend a "buy and hold" investment strategy. For 2026, the 0% long-term capital gains rate applies to single filers with total taxable income up to $47,025, married filing jointly up to $94,050, and heads of household up to $63,000. The 15% rate applies to most middle-income taxpayers, and the 20% rate applies to high-income earners. The Net Investment Income Tax (NIIT) adds an additional 3.8% for single filers with modified AGI exceeding $200,000 ($250,000 for married filing jointly). This surtax was introduced as part of the Affordable Care Act to help fund Medicare and applies to the lesser of your net investment income or the excess over the threshold. State taxes vary widely — some states like Texas, Florida, and Nevada have no state income tax, while others like California (up to 13.3%) and New York (up to 10.9%) can significantly increase the total tax burden on capital gains. Understanding these rules allows investors to make tax-aware decisions about when to sell assets and how to structure their investment portfolio.

Frequently Asked Questions

Sources & References