Capital gains tax is the tax you owe when you sell an asset — a stock, bond, piece of real estate, or cryptocurrency — for more than you paid for it. The profit is called a capital gain, and how much tax you pay depends on one critical factor: how long you held the asset. Understanding the short-term versus long-term distinction can meaningfully change your after-tax return and inform better investment decisions.
Short-Term Capital Gains
A short-term capital gain occurs when you sell an asset you have held for one year or less. Short-term gains are taxed as ordinary income — the same rates that apply to your wages, salary, and interest income. In 2026, those federal tax rates range from 10% to 37% depending on your taxable income. If you are in the 22% or 24% tax bracket, selling a stock after 10 months could cost you 22–24 cents of every dollar of profit in federal taxes alone.
Long-Term Capital Gains
A long-term capital gain occurs when you sell an asset you have held for more than one year. Long-term gains qualify for preferential tax rates — significantly lower than ordinary income rates. For 2026:
- 0% rate: Single filers with taxable income up to $47,025 / married filing jointly up to $94,050
- 15% rate: Single filers $47,025–$518,900 / married filing jointly $94,050–$583,750
- 20% rate: Single filers above $518,900 / married filing jointly above $583,750
For most middle-income Americans, long-term capital gains are taxed at 15% federally — roughly half the ordinary income rate they would face on short-term gains. This difference is the primary reason many investors hold positions for at least one year before selling.
The One-Year Rule in Practice
The holding period begins the day after you acquire the asset and ends on the day you sell it. To qualify for long-term treatment, you must hold for more than 365 days — not exactly 365 days. If you buy a stock on January 15, 2025 and sell on January 15, 2026, that is exactly 365 days — still short-term. You need to sell on January 16, 2026 or later for long-term treatment.
Net Investment Income Tax (NIIT)
High earners may owe an additional 3.8% Net Investment Income Tax on capital gains. The NIIT applies when your modified AGI exceeds $200,000 (single) or $250,000 (married filing jointly). This means the effective top rate on long-term capital gains is 23.8% federally for high earners (20% + 3.8%), plus applicable state taxes.
State Capital Gains Taxes
Most states tax capital gains as ordinary income at the state rate. A few states treat capital gains more favorably. Some states — including Florida, Texas, Nevada, Washington, and others — have no state income tax at all, which can make a meaningful difference for investors with large gains. If you are planning a major asset sale, your state tax rate can significantly affect the after-tax result.
Capital Losses and Tax-Loss Harvesting
Capital losses offset capital gains dollar-for-dollar. If you have $10,000 in long-term gains and $4,000 in long-term losses in the same year, you only pay tax on $6,000 of net gains. If your losses exceed your gains, you can deduct up to $3,000 of net capital losses against ordinary income per year, with any remaining losses carried forward to future years. This is the basis of tax-loss harvesting — strategically realizing losses to reduce your tax bill.
Special Rules for Real Estate
When you sell your primary home, up to $250,000 of capital gains ($500,000 for married couples) may be excluded from tax if you have lived in the home for at least two of the past five years. Any gain above the exclusion is taxed at long-term capital gains rates if you owned the home for more than a year. Investment property gains are taxed as capital gains, but also potentially subject to depreciation recapture at up to 25%.
Cryptocurrency and Capital Gains
The IRS treats cryptocurrency as property. Selling crypto, converting it to another crypto, or using it to buy goods or services all triggers a taxable event. Short-term crypto gains are taxed as ordinary income; long-term gains qualify for preferential rates — the same rules as stocks. Proper crypto tax reporting is required and increasingly enforced through exchange reporting requirements.
Bottom Line
The single most powerful lever for reducing capital gains tax is the holding period. Waiting one year and one day before selling a profitable position can cut your federal tax rate by half. Combine that with tax-loss harvesting and tax-advantaged account usage (holding investments in an IRA or 401(k) where gains grow tax-deferred or tax-free), and you can keep significantly more of your investment returns over a lifetime.