Capital Gains: What They Are, Tax Explained & Short-Term vs Long-Term

What are capital gains?

If you're asking what capital gains are, here's the simplest answer:

A capital gain is the increase in value of a capital asset that you realize when you sell it. A capital asset is almost anything you own for personal or investment purposes, including stocks, bonds, real estate, mutual fund shares, and many other property types. You only have a taxable capital gain once you sell the asset; any increase in value while you still hold it is considered an unrealized gain and doesn't trigger taxes.

Capital gains differ from ordinary income, such as wages or interest, because they arise from the sale of property rather than from compensation or routine income flows. They also differ from dividends, which are typically taxed under their own rules, depending on whether they are classified as qualified or non-qualified.

Why capital gains matter

Capital gains are one of two main ways investments generate returns, alongside income from dividends, interest, or distributions. They drive the math behind most growth strategies and shape how investors think about portfolio construction, hold periods, and after-tax results.

• After-tax returns: how and when you realize gains has a direct impact on your effective return.
• Holding strategy: the one-year cutoff for long-term treatment incentivizes buy-and-hold approaches over rapid trading.
• Loss planning: capital losses can offset gains, and unused losses can carry forward to future tax years.

Understanding capital gains is foundational to broader concepts such as risk-adjusted return, since two investments with the same pre-tax return can yield very different after-tax outcomes.

Short-term vs long-term capital gains

The biggest distinction in capital gains is whether the gain qualifies as short-term or long-term, which depends entirely on how long you held the asset before selling it. The IRS sets the dividing line at exactly one year, and different tax rates apply on each side of that threshold.

How the holding period determines the classification

To determine your holding period, count from the day after you acquired the asset up to and including the day you disposed of it. If that period exceeds one year, the gain qualifies as long-term. If it's one year or less, the gain is short-term and receives less favorable tax treatment.

Special rules apply in certain situations. Property received as a gift typically takes on the donor's holding period, while property inherited from a decedent is generally treated as long-term regardless of how briefly the heir holds it.

Why the difference matters

The classification matters because long-term capital gains receive preferential federal tax treatment. Long-term gains are taxed at 0%, 15%, or 20% based on your taxable income, while short-term capital gains are taxed as ordinary income at your regular marginal rate, which can reach 37% for top earners in 2025.

This gap creates a strong incentive to hold qualifying investments for longer than a year when possible. For active traders, the trade-off between capturing a near-term price movement and paying ordinary income rates on the gain is one of the central tensions in short-term vs. long-term capital gains decisions, alongside liquidity needs.

Capital gains tax explained

Here's capital gains tax explained in plain terms: when you sell a capital asset at a profit, the federal government taxes that profit, with the rate depending on your holding period, your taxable income, your filing status, and the type of asset. State taxes may apply in addition to the federal rate.

Long-term capital gains tax rates

For 2025, the IRS applies three federal long-term capital gains tax rates: 0%, 15%, and 20%. The rate that applies depends on your taxable income and filing status.

Some asset types face special rates: gains on collectibles such as coins or art can be taxed at up to 28%, and real estate gains tied to depreciation recapture at up to 25%.

Short-term capital gains tax

Short-term capital gains are taxed as ordinary income, which means they're subject to the same federal income tax brackets that apply to wages or salary. Depending on your total taxable income, that rate ranges from 10% to 37% in 2025. The lack of a preferential rate is one reason long-term holding tends to be more tax-efficient.

Other tax considerations

Beyond the headline rates, three additional factors can affect what you actually owe on a capital gain:

• Net Investment Income Tax (NIIT): a 3.8% surtax applies to net investment income for individuals with modified adjusted gross income above $200,000 (single or head of household) or $250,000 (married filing jointly), per IRS Topic 559.
• State taxes: many states tax capital gains as ordinary income at the state level, adding several percentage points to your total liability.
• Capital losses: net losses can offset gains, and any net loss above gains can offset up to $3,000 of ordinary income per year ($1,500 if married filing separately), with the rest carried forward to future years.

Capital gains examples

Real-world capital gains examples help clarify how the rules play out across different asset types and holding periods. The table below shows four illustrative scenarios with simplified numbers.

A few takeaways from these scenarios:

• The same dollar gain can be taxed very differently depending on holding period and filing status.
• Real estate, stocks, and other capital assets generally follow the same framework, though collectibles and certain real estate have special rates.
• Inherited assets typically receive a stepped-up basis to fair market value at the date of death and are treated as long-term regardless of how briefly the heir holds them.

Capital gains and accredited investors

For accredited investors looking beyond public markets, capital gains in private deals follow the same federal framework but with some practical differences. Private investments in startups, private credit, and other alternative investments often have multi-year hold periods that naturally align with long-term capital gains treatment. The SEC defines accredited investor status and sets the verification procedures under Rule 506 of Regulation D that platforms use to confirm investor eligibility for private offerings.

To explore private market opportunities, see Marketplace, Collective, and The Power 20.

Final thoughts

Capital gains sit at the intersection of investing strategy and tax planning, which is why understanding what capital gains are and how holding periods shape their taxation matters for any serious investor. The federal framework rewards patience by taxing long-term gains at lower rates, and that difference compounds meaningfully over years of investing. For any portfolio held outside tax-advantaged accounts, factoring after-tax outcomes into sell decisions is a durable advantage.