Capital Gains
By WikiWealth Editorial Team|Last updated:
Key Takeaways
- A capital gain is the profit realized when you sell an asset for more than its purchase price
- Short-term capital gains (assets held less than one year) are taxed as ordinary income
- Long-term capital gains (assets held more than one year) are taxed at preferential rates of 0%, 15%, or 20%
- Tax-loss harvesting and strategic holding periods can help minimize capital gains taxes
Definition
A capital gain is the increase in value of an asset — such as a stock, bond, real estate, or other investment — when it is sold for a price higher than the original purchase price (cost basis). Capital gains are classified as either short-term (held one year or less) or long-term (held more than one year), with significantly different tax implications for each.
How It Works
Capital gains are calculated as the difference between the sale price and the cost basis of an asset. The cost basis includes the original purchase price plus any commissions, fees, or improvements. Capital gains are only realized (and taxed) when the asset is actually sold — unrealized gains on assets you still hold are not taxed. The U.S. tax code incentivizes long-term investing by taxing long-term capital gains at lower rates (0%, 15%, or 20% depending on income level) compared to short-term gains, which are taxed at your ordinary income tax rate (up to 37%). High earners may also owe an additional 3.8% Net Investment Income Tax.
Example
An investor buys 100 shares of Microsoft (MSFT) at $250 per share for a total cost of $25,000. Two years later, they sell all shares at $400 per share, receiving $40,000. The capital gain is $40,000 − $25,000 = $15,000. Because the shares were held for more than one year, this is a long-term capital gain. If the investor is in the 15% long-term capital gains bracket, they owe $2,250 in taxes on the gain, keeping $12,750 of the profit.
Why It Matters
Capital gains represent a primary way investors build wealth, and understanding their tax treatment is essential for maximizing after-tax returns. The difference between short-term and long-term capital gains rates can significantly impact net returns — holding an asset for just one additional day beyond the one-year mark can reduce the tax rate by 10% to 20% or more. Tax-efficient investing strategies, including tax-loss harvesting and strategic asset location, can meaningfully improve long-term portfolio outcomes.
Advantages
- Long-term capital gains benefit from preferential tax rates, significantly lower than ordinary income rates
- Capital gains are only taxed when realized, allowing investors to defer taxes on unrealized gains
- Tax-loss harvesting allows investors to offset gains with losses, reducing overall tax liability
- Stepped-up basis at death eliminates capital gains taxes on inherited assets
Limitations
- Short-term capital gains are taxed at ordinary income rates, which can be as high as 37%
- Frequent trading generates short-term gains, eroding returns through higher taxes
- Capital gains taxes reduce the compounding benefit of investment returns
- Complex cost basis calculations for assets purchased at different times and prices
Frequently Asked Questions
Related Terms
Browse more definitions in the financial terms glossary.