Capital Gains Tax Estimate Calculator
Estimate federal capital gains tax on investments based on purchase price, sale price, holding period, and income bracket.
Capital gains tax is charged on the profit from selling an asset (stocks, bonds, real estate, etc.) for more than you paid. The tax rate depends on how long you held the asset and your taxable income level. Understanding the difference between short-term and long-term capital gains is essential for tax planning.
Basic Formula:
Capital Gain = Sale Price - Purchase Price - Transaction Costs
Tax Owed = Capital Gain × Applicable Tax Rate
Short-Term vs. Long-Term Capital Gains:
- Short-term: Asset held for 1 year or less. Taxed at your ordinary income tax rate (10%–37%).
- Long-term: Asset held for more than 1 year. Taxed at preferential rates (0%, 15%, or 20%).
2025 Long-Term Capital Gains Tax Rates (Federal):
| Filing Status | 0% Rate | 15% Rate | 20% Rate |
|---|---|---|---|
| Single | Up to $48,350 | $48,351–$533,400 | Over $533,400 |
| Married Filing Jointly | Up to $96,700 | $96,701–$600,050 | Over $600,050 |
| Head of Household | Up to $64,750 | $64,751–$566,700 | Over $566,700 |
Net Investment Income Tax (NIIT): An additional 3.8% surtax applies to investment income for individuals with modified adjusted gross income over $200,000 (single) or $250,000 (married filing jointly). This makes the effective top long-term capital gains rate 23.8%.
Short-Term Capital Gains Rates (Ordinary Income, 2025):
| Tax Bracket | Rate |
|---|---|
| $0–$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% |
Capital Losses: If you sell an asset for less than you paid, you have a capital loss. Capital losses offset capital gains dollar for dollar. If your losses exceed your gains, you can deduct up to $3,000 of net capital losses against ordinary income per year. Remaining losses carry forward to future tax years indefinitely.
Tax-Loss Harvesting: Selling losing investments before year-end to offset gains is a common strategy. Be aware of the wash-sale rule — if you buy a substantially identical security within 30 days before or after the sale, the loss is disallowed.
State Taxes: Many states also tax capital gains, typically at ordinary income rates. State capital gains taxes range from 0% (in states with no income tax like Florida, Texas, Nevada) to over 13% (California). This calculator estimates federal tax only.
Practical Tips: Hold investments for at least one year and one day to qualify for long-term rates. Consider timing your sales to years when your income is lower. Donate appreciated assets to charity instead of selling them to avoid capital gains entirely and receive a tax deduction. Inherited assets receive a stepped-up cost basis, eliminating unrealized gains at death.