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Taxes

Capital Gains Taxes Explained

How profit from selling an investment is taxed differently from a paycheck, and why the holding period changes the rate.

Selling a stock, a house, or another investment for more than it was originally bought for creates a profit - and that profit is taxed differently than ordinary income from a paycheck. Understanding capital gains taxes matters for anyone who invests, since the rules genuinely reward patience in a specific, measurable way.

What counts as a capital gain

A capital gain is the profit earned when an investment or asset is sold for more than its original purchase price, called its cost basis. Buying a stock for $2,000 and later selling it for $3,000 creates a $1,000 capital gain. Importantly, that gain isn’t taxed while the investment is simply held and rising in value on paper - it only becomes a realized gain, and therefore taxable, once the asset is actually sold.

Why an unsold investment owes nothing yet

Imagine an investor buys shares for $5,000, and over several years they rise in value to $12,000. As long as those shares remain unsold, the investor owes no capital gains tax on that $7,000 increase, no matter how large it grows on paper. Only when the shares are actually sold does the $7,000 become a realized gain subject to tax - which is why investors sometimes deliberately hold onto appreciated investments, a strategy sometimes discussed alongside estate planning, to delay or entirely avoid triggering the tax.

Why how long you hold matters

The tax rate applied to a capital gain depends heavily on how long the asset was held before being sold. A short-term capital gain, from an asset held one year or less, is generally taxed at the same ordinary income tax rates that apply to wages, following the tax brackets covered elsewhere in this module. A long-term capital gain, from an asset held more than one year, is instead taxed at separate, generally lower rates - commonly 0%, 15%, or 20% in the United States, depending on total income.

Why the system is designed this way

This structure is generally justified as an incentive for long-term investment over short-term trading, on the reasoning that stable, patient capital tends to support businesses and economic growth more reliably than money that moves in and out of investments quickly chasing short-term price swings. Critics of the lower long-term rate, on the other hand, point out that it disproportionately benefits people wealthy enough to hold large investment portfolios in the first place, since most ordinary workers earn the bulk of their income through wages rather than investment gains.

Selling a winning investment one day before it qualifies for the long-term rate

Selling an appreciated asset even one day before hitting the one-year holding mark means the entire gain is taxed at the higher short-term rate instead of the lower long-term rate - a difference that, on a large gain, can genuinely be worth waiting a short additional stretch of time to avoid, all else being equal.

Capital losses can offset gains

Investments don’t only go up - a capital loss, from selling an asset for less than its cost basis, can generally be used to offset capital gains elsewhere in the same tax year, reducing the total amount subject to tax. This is part of why investors sometimes deliberately sell a losing investment near year-end specifically to offset gains realized earlier, a practice often called tax-loss harvesting.

Key takeaways
  • A capital gain is the profit from selling an investment for more than its original cost basis.
  • Gains aren't taxed until realized through an actual sale, not while an investment simply rises in value on paper.
  • Short-term gains, from assets held a year or less, are taxed at the same rates as ordinary income.
  • Long-term gains, from assets held over a year, are taxed at separate, generally lower rates.
  • The lower long-term rate is meant to encourage patient investment, though critics say it mainly benefits wealthier investors.
  • Capital losses can offset capital gains in the same tax year, reducing the total amount subject to tax.
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