When you sell an investment for more than you paid, the profit is a capital gain — and the IRS wants a share of it. But how much you owe depends heavily on one factor: how long you held the investment before selling. The tax code draws a sharp line at one year, and crossing it can dramatically reduce the taxes you owe on the same dollar amount of profit.
The One-Year Rule
- Held 12 months or less: Short-term capital gain — taxed as ordinary income at your regular bracket rate
- Held more than 12 months: Long-term capital gain — taxed at preferential lower rates (0%, 15%, or 20%)
The one-year threshold is a hard line. Selling one day before the anniversary date costs you the preferential long-term rate. For large gains, that one day can be worth thousands of dollars in additional taxes.
Short-Term Capital Gains Rates (2026)
Short-term gains are added to your ordinary income and taxed at your regular federal rate — the same as wages:
| Taxable Income (Single) | Short-Term Rate |
|---|---|
| Up to $11,925 | 10% |
| $11,926 – $48,475 | 12% |
| $48,476 – $103,350 | 22% |
| $103,351 – $197,300 | 24% |
| $197,301 – $250,525 | 32% |
| $250,526 – $626,350 | 35% |
| Over $626,350 | 37% |
Long-Term Capital Gains Rates (2026)
| Rate | Single (Taxable Income) | Married Filing Jointly | Head of Household |
|---|---|---|---|
| 0% | Up to $48,350 | Up to $96,700 | Up to $64,750 |
| 15% | $48,351 – $533,400 | $96,701 – $600,050 | $64,751 – $566,700 |
| 20% | Over $533,400 | Over $600,050 | Over $566,700 |
These thresholds apply to taxable income including the gain. A married couple with $80,000 in wages and the $32,200 standard deduction has $47,800 in taxable income from wages. They can realize up to $48,900 more in long-term gains ($96,700 − $47,800) and pay zero federal capital gains tax.
Side-by-Side Example: The Cost of Selling Early
You bought $50,000 of stock now worth $80,000 — a $30,000 gain. You're a single filer with $70,000 in other taxable income (22% bracket).
| Sell After 11 Months (Short-Term) | Sell After 13 Months (Long-Term) | |
|---|---|---|
| Gain amount | $30,000 | $30,000 |
| Tax rate | 22% | 15% |
| Federal tax on gain | $6,600 | $4,500 |
| Tax saved by waiting 2 months | — | $2,100 |
Net Investment Income Tax (NIIT)
High-income investors face an additional 3.8% NIIT on top of capital gains rates. It applies if MAGI exceeds $200,000 (single) or $250,000 (married jointly). These thresholds are not inflation-adjusted — more taxpayers get caught each year. At the top, high earners effectively face a 23.8% federal rate on long-term gains.
Capital Loss Harvesting
Capital losses offset capital gains dollar-for-dollar. If losses exceed gains, you can deduct up to $3,000 against ordinary income per year, with remaining losses carrying forward indefinitely. Tax-loss harvesting — selling underperformers to generate losses that offset gains — is a legitimate strategy. Watch the wash-sale rule: you can't repurchase a substantially identical investment within 30 days of the sale.
Special Cases
Cryptocurrency: Treated as property. Every sale, trade, or use triggers a gain or loss. Short vs. long-term rules apply identically to crypto as to stocks.
Primary home sales: Exclude up to $250,000 of gain (single) or $500,000 (married) if you've owned and lived in the home for at least two of the past five years.
Inherited assets: Receive a stepped-up basis to fair market value at the date of death — effectively eliminating all gain accrued during the original owner's lifetime.
Planning Strategies
- Hold investments for more than one year whenever feasible
- Harvest losses to offset gains in taxable accounts
- Use IRAs and 401(k)s for high-growth investments — gains grow tax-deferred or tax-free
- Time large sales in lower-income years when the 0% rate may apply
- Donate appreciated assets to charity — avoid gains tax entirely and deduct the full fair market value
Use our Capital Gains Tax Calculator to estimate what you'll owe. For your full federal tax picture, try our Income Tax Calculator.
Strategic Holding Period Planning
The difference between short-term and long-term capital gains tax can be dramatic — the same gain might cost significantly more in federal tax if sold a day early. Understanding when the long-term threshold matters most helps you make better sell decisions.
The One-Year Holding Period: Exactly What It Means
Long-term treatment requires holding the asset for more than one year — not one year exactly. If you buy on March 15, 2025, you must sell on March 16, 2026 or later to qualify for long-term rates. The holding period begins the day after purchase (the trade date, not the settlement date) and includes the day of sale. Selling on the one-year anniversary date itself produces a short-term gain and is taxed as ordinary income.
Inherited Assets: The Stepped-Up Basis
Assets inherited from a deceased person receive a stepped-up basis to their fair market value at the date of death — regardless of how long the decedent held them. The heir's holding period is automatically treated as long-term, regardless of how quickly they sell after inheriting. This means decades of appreciation can be passed to heirs essentially tax-free through the step-up in basis — one of the most significant wealth transfer benefits in the tax code.
Mutual Funds: Embedded Short-Term Gains
Even if you've held a mutual fund for years, the fund buys and sells underlying securities throughout the year. At year-end, the fund distributes net capital gains to shareholders — including short-term gains taxed at ordinary income rates, even if you never sold a single fund share yourself. Check a fund's estimated capital gains distributions before year-end to avoid surprise taxable income. Index funds and ETFs generally distribute far fewer capital gains than actively managed funds due to lower portfolio turnover.
High-Income Filers: The Full Rate Stack
For married filers with income over $250,000, the effective capital gains rate includes the 3.8% Net Investment Income Tax on top of the standard 20% rate, bringing the federal rate to 23.8% on long-term gains. Combined with high state income tax rates, the real advantage of long-term treatment narrows — but it still beats ordinary income rates in most cases.
Use our capital gains tax calculator to model your gain under both short-term and long-term rates, and our 2026 capital gains rate guide for complete income thresholds at each rate.
Key Takeaway: The One-Year Rule Is Worth Waiting For
The tax rate difference between short-term and long-term treatment is often significant enough to change investment decisions. A $20,000 gain taxed as ordinary income at 22% costs $4,400. The same gain after one year of holding costs $3,000 at the 15% long-term rate -- a $1,400 difference on the same profit, simply by waiting two additional months. For larger gains or higher earners, the savings are proportionally larger. The one-year rule is one of the most straightforward and reliable tax strategies available to individual investors, requiring no professional help or complex planning -- just patience and an awareness of your purchase dates.