What Is Capital Gains Tax? Short-Term vs Long-Term Rates 2025

Capital gains tax is a federal tax on the profit you make when selling an asset for more than its purchase price. The "gain" is the difference between what you paid (your cost basis) and what you received at sale. This tax applies to stocks, bonds, mutual funds, ETFs, real estate, cryptocurrency, collectibles, and most other assets that appreciate in value.

The U.S. tax code divides capital gains into two categories based on holding period: short-term (held one year or less) and long-term (held longer than one year). This distinction matters because long-term gains receive significantly lower tax rates. According to IRS data, taxpayers reported over $2.3 trillion in capital gains on 2022 returns, with long-term gains accounting for roughly 75% of that total.

Short-Term vs Long-Term Capital Gains

Short-term capital gains apply to assets held for one year or less. These gains are taxed at your ordinary income tax rate, which ranges from 10% to 37% for tax year 2025. If you buy a stock on January 15 and sell it on December 20 of the same year, any profit is a short-term gain.

Long-term capital gains apply to assets held for more than one year. These gains benefit from preferential tax rates of 0%, 15%, or 20%, depending on your taxable income and filing status. The same stock purchased on January 15 and sold on January 16 of the following year (holding for one year and one day) qualifies for long-term rates.

2025 Long-Term Capital Gains Tax Brackets

For tax year 2025, the long-term capital gains rates are based on your total taxable income (including the gains themselves):

Single Filers

• 0% rate: taxable income up to $48,350
• 15% rate: taxable income from $48,351 to $533,400
• 20% rate: taxable income above $533,400

Married Filing Jointly

• 0% rate: taxable income up to $96,700
• 15% rate: taxable income from $96,701 to $600,050
• 20% rate: taxable income above $600,050

Head of Household

• 0% rate: taxable income up to $64,750
• 15% rate: taxable income from $64,751 to $566,700
• 20% rate: taxable income above $566,700

Additionally, high earners may owe the 3.8% Net Investment Income Tax (NIIT) on capital gains if their modified adjusted gross income exceeds $200,000 (single) or $250,000 (married filing jointly). This can bring the effective top rate on long-term gains to 23.8%.

The 0% Capital Gains Bracket

One of the most underused tax benefits is the 0% long-term capital gains bracket. For 2025, single filers with taxable income below $48,350 (or married couples below $96,700) pay zero federal tax on long-term gains. This includes the standard deduction, so a single filer could earn up to $63,350 in total income ($48,350 + $15,000 standard deduction) and still pay 0% on long-term gains.

This is particularly valuable for retirees with lower income, early retirees living on savings, or anyone in a temporarily low-income year (career transition, sabbatical). Strategic "gain harvesting" during these years can lock in 0% tax on appreciated assets.

How to Calculate Capital Gains Tax

Your cost basis includes the original purchase price plus any transaction costs (commissions, fees). For inherited assets, the cost basis is typically the fair market value at the date of death ("stepped-up basis"). For gifted assets, you generally inherit the donor's original cost basis.

Capital Gains Tax on Real Estate

Real estate sales follow the same short-term and long-term rules, but homeowners get a major exclusion. Under Section 121 of the tax code, you can exclude up to $250,000 in gains ($500,000 for married couples) from the sale of your primary residence if you lived there for at least 2 of the past 5 years. Any gain above the exclusion is taxed at capital gains rates.

Investment properties do not qualify for the Section 121 exclusion. However, investors can defer capital gains tax using a 1031 like-kind exchange, which allows you to reinvest sale proceeds into a similar property without triggering an immediate tax event.

Capital Gains Tax on Cryptocurrency

The IRS treats cryptocurrency as property, not currency. Every sale, exchange, or use of crypto to purchase goods triggers a taxable event. This includes swapping one cryptocurrency for another (e.g., Bitcoin to Ethereum). The same short-term and long-term rates apply based on holding period.

Tracking cost basis for crypto can be complex because of frequent trades, staking rewards, airdrops, and forks. The IRS requires specific identification or FIFO (first in, first out) accounting for determining which coins were sold. Starting in 2025, centralized exchanges must report transactions on Form 1099-DA.

Strategies to Reduce Capital Gains Tax

1. Hold assets for over one year: This single step can cut your tax rate from up to 37% (short-term) to 0%, 15%, or 20% (long-term).
2. Tax-loss harvesting: Sell losing investments to offset gains. Net losses above your gains can offset up to $3,000 of ordinary income per year, with unlimited carryforward.
3. Use the 0% bracket: In low-income years, sell appreciated long-term assets while your taxable income stays below the 0% threshold.
4. Contribute to tax-advantaged accounts: Gains inside 401(k), IRA, and Roth accounts are not taxed annually. Roth withdrawals are completely tax-free.
5. Donate appreciated assets: Giving long-term appreciated stock to charity lets you deduct the full market value without ever paying capital gains tax on the appreciation.
6. Primary residence exclusion: Live in the home for 2+ years to qualify for the $250,000/$500,000 exclusion.
7. Installment sales: Spreading a large gain across multiple tax years can keep you in lower brackets.

Capital Gains Tax vs. Ordinary Income Tax

Short-term capital gains are taxed at ordinary income rates (10% to 37%), making them equivalent to wage income from a tax perspective. Long-term capital gains receive preferential treatment with rates of 0%, 15%, or 20%. This disparity is one of the largest tax advantages available to long-term investors and is a major reason financial advisors recommend a buy-and-hold strategy.

For a taxpayer in the 32% ordinary income bracket, the difference between short-term and long-term treatment on a $50,000 gain is $8,500 ($16,000 at 32% vs. $7,500 at 15%). Holding an asset for just one extra day can cross the threshold from short-term to long-term classification.

2024 vs 2025 Capital Gains Rates

The long-term capital gains rate structure (0%, 15%, 20%) has remained the same since 2013. However, the income thresholds for each bracket adjust annually for inflation. For 2025, the 0% bracket for single filers increased to $48,350 (from $47,025 in 2024), providing slightly more room to realize gains tax-free. The 20% threshold for singles increased to $533,400 (from $518,900 in 2024).

If you sold assets in 2024, use the 2024 thresholds when filing your return. If you are planning sales for 2025, use the updated 2025 thresholds. Our capital gains tax calculator supports both years.

Bottom Line

Capital gains tax is one of the most important concepts for investors to understand. The difference between short-term and long-term rates can save thousands of dollars on a single transaction. Use our capital gains tax calculator to model your specific situation, and consider strategies like tax-loss harvesting, the 0% bracket, and tax-advantaged accounts to minimize your tax liability.