capital gains tax

Capital gains tax (CGT) is the tax owed when an asset is sold for more than its adjusted basis. It applies to many types of capital assets, including stocks, bonds, digital assets, real estate, and collectibles. The holding period is one factor in how gains are taxed, making capital gains tax an important consideration in planning.

The holding period determines whether gains fall under long-term capital gains tax rates of 0 percent, 15 percent, or 20 percent, or under short-term CGT rates taxed as ordinary income. Certain assets, such as collectibles, may be subject to different long-term CGT rates.

How capital gains tax affects portfolios

Selling an asset is the event that triggers capital gains tax. Even if an investment has increased in value for years, no tax is due until the gain is realized through a sale. This distinction between realized and unrealized gains matters in every taxable portfolio. Unrealized gains exist only on paper while realized gains trigger tax based on applicable CGT brackets.

• Portfolio turnover determines how often these taxable events occur. Higher turnover can lead to more frequent realization of gains, including short-term capital gains that are taxed as ordinary income
• Advisors also assess how capital gains distribute across different assets. For example, mutual funds and ETFs may generate gains within the fund with the sale of securities. These gains can be passed to investors at year-end even if no shares were sold. This means that CGT on stocks and funds can occur without direct trading
• Filing status adds another layer to these decisions. For example, a head-of-household filer may remain in the 0 percent long-term bracket longer than a same-income single filer. Married couples also have access to a wider income threshold with different tax brackets
• Another consideration is the net investment income tax (NIIT). This surtax adds 3.8 percent to investment income, including capital gains for high-income households. These rate structures influence every decision involving realized gains, from rebalancing to transitioning legacy holdings

Long-term vs. short-term: What advisors need to know

For US taxable accounts, the holding period is the starting point for any discussion about capital gains tax brackets and after-tax returns. The difference between the two shapes several planning opportunities, including:

• Waiting until an asset qualifies for long-term treatment can move a gain from a high short-term CGT rate into a lower long-term band, improving after-tax outcomes
• Deferring other income or spreading asset sales across multiple tax years to keep more gains in the 0 percent or 15 percent ranges
• Coordinating realized losses with gains in the same tax year helps offset short-term and long-term gains. Excess net losses up to $3,000 can reduce ordinary income with remaining losses carried forward to future tax years
• Placing investments that generate frequent trades or short-term gains in tax-advantaged accounts can help reduce exposure to ordinary income tax rates

Capital gains tax planning for high-net-worth individuals

High-net-worth individuals have more complex capital gains tax considerations. Because gains are taxed only when realized, planning around timing, structure, and account location becomes central to improving after-tax outcomes.

One priority is managing the sale of large or highly appreciated assets. Spreading a sale across multiple tax years can help manage capital gains tax brackets and reduce exposure to higher short-term rates. Long-term rates are often more favourable, so holding assets for more than one year remains a core planning tool.

Here’s an explainer on how high-net-worth individuals approach taxes on capital gains:

For those facing high realized gains, tax-loss harvesting can offset profits with losses elsewhere in the portfolio. Year-end planning is another area that benefits from careful review. Advisors often look at expected income levels, harvesting opportunities, and unrealized gain and loss profile before deciding whether to recognize gains.

For those who expect to fall into lower long-term capital gains tax bracket, deferring the sale of an appreciated asset may improve outcomes.

Understanding where taxpayers sit within the 2025 capital gains tax brackets helps guide decisions around timing and recognition. Overall, effective CGT planning requires a balance between portfolio strategy and tax treatment.

Tax-loss harvesting strategies

Tax-loss harvesting offers a structured way to reduce capital gains tax and improve after-tax returns. The strategy works by realizing losses on underperforming investments and using those losses to offset gains that would otherwise be taxed.

A realized loss can offset realized gains from stocks, bonds, mutual funds, ETFs, or other capital assets. When losses exceed gains, up to $3,000 of the remaining amount may be used to reduce ordinary income with any unused losses carried forward to future tax years. This makes tax-loss harvesting valuable as part of an ongoing tax-efficient investment process.

Individuals should account for the wash-sale rule. This prohibits a loss if the same or a “substantially identical” security is purchased within 30 days before or after the sale. The rule applies across direct holdings, options, and mutual funds. Careful monitoring of possible wash sales helps ensure those losses remain valid for tax purposes.

Estate planning and stepped-up basis considerations

A step-up basis is a central tax provision that influences how capital gains tax affects wealth transfer. When an individual inherits an asset, its cost basis resets to the asset’s fair market value on the date of the previous owner’s death. This adjustment determines how much capital gains tax may be owed when the asset is eventually sold.

Since inherited assets tend to appreciate over long holding periods, the step-up in basis often eliminates significant unrealized gains for tax purposes. The impact for beneficiaries can be substantial as it can reduce taxable capital gain when the heir chooses to sell.

Community property rules can further enhance the benefit. In community property states, both halves of community property may receive a full step-up in basis upon the first spouse’s death. Certain states allow residents and non-residents to establish community property trusts that may qualify assets for community property treatment under federal tax law.

Charitable giving strategies to reduce capital gains

Charitable giving can also reduce exposure to capital gains tax, especially for those holding long-term appreciated assets. When a person donates assets directly to a qualified charity, the embedded gain is removed from the tax calculation entirely. Because the donation transfers the asset without the need to sell it first, the donor avoids paying long-term capital gains tax on the appreciation.

Others use donor-advised funds to secure an immediate deduction while distributing grants to charities over time. Charitable planning may also support estate strategies since naming a charity as a beneficiary of retirement accounts or including charitable trusts can reduce estate tax exposure.

Common capital gains tax mistakes to avoid

Selling assets without evaluating tax impact

• Realizing gains too early can increase an investor’s taxable income, trigger higher ordinary income rates, or expose them to the 3.8 percent net investment income tax (NIIT)
• Failing to review whether a sale can be postponed may lose opportunities timed around income changes or year-end planning
• An assessment should determine whether the gain needs to be realized now or whether deferral supports better tax efficiency

Missing opportunities for long-term capital gain treatment

• Selling an asset at 11 months instead of 12 months can shift the gain from the preferential long-term CGT rate to the higher short-term rate
• Not tracking holding periods can reduce after-tax returns and weaken the overall investment strategy
• Reviewing trade dates and monitoring holding periods helps capture long-term capital gain benefits

Assumptions about tax-deductible items or how gains are taxed

• Some investors mistakenly believe reinvested dividends are not taxable, or that losses are deductible in all accounts
• Capital losses can offset gains and up to $3,000 of ordinary income, but these deductions do not apply within tax-advantaged accounts such as IRAs or 401(k)s
• Misunderstanding wash-sale rules leads to disallowed losses
• Inaccurate cost basis tracking may lead to overstated gains and higher taxes

By monitoring these issues and reviewing the rules governing capital gains taxes, advisors can help ensure that every investment decision considers both return potential and tax efficiency.

FAQs on capital gains tax

Is capital gains tax 15% or 20% in the United States?

Long-term capital gains tax rates in the US are generally 0 percent, 15 percent, or 20 percent, depending on filing status and taxable income. Individuals in higher income brackets may also owe the 3.8 percent NIIT. Short-term capital gains are taxed as ordinary income under standard tax brackets.

Which states have no state-level capital gains tax?

Some states do not levy a state income tax and, therefore, do not tax capital gains at the state level. These include Alaska, Florida, Nevada, South Dakota, Texas, Wyoming, and Tennessee. In these jurisdictions, capital gains are not subject to state-level income tax, though federal capital gains tax rules still apply.

Here’s how each state is different:

How do you get 0% tax on capital gains?

Several situations may result in a 0 percent tax on capital gains. Staying within the income threshold for the 0 percent long-term capital gains bracket is one path. Donating long-term appreciated assets to charity eliminates the gain entirely while providing an income tax deduction.

Bringing capital gains tax planning into focus

Investors who understand how capital gains tax works are better positioned to make investment decisions, reduce unnecessary tax exposure, and strengthen long-term outcomes. A clear framework helps determine when to hold, when to harvest, and when to rebalance so that broader financial plans are met.

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