How Are Long-Term Capital Gains on Mutual Funds Taxed?

Long-term capital gains on mutual funds are taxed at a federal rate of 0%, 15%, or 20%, depending on your taxable income and filing status. These gains reach you two different ways. The fund itself distributes gains from securities its managers sold inside the portfolio, and you separately trigger gains when you sell or redeem your own shares. Both qualify for long-term rates only when the relevant holding period runs longer than one year. For 2026, a single filer pays 0% on long-term gains as long as taxable income stays at or below $49,450; a married couple filing jointly gets that same 0% rate up to $98,900.¹

The One-Year Holding Rule

Long-term treatment turns on a single line: under federal law, a capital gain qualifies as long-term only if you held the asset for more than one year before selling it.² The holding period starts the day after you buy and runs through the day you sell. Shares bought on March 1 clear the long-term threshold if you sell them on or after March 2 of the next year.

Miss the mark by a day and the entire gain is taxed as ordinary income, at rates that reach 37%.³ That’s nearly double the top long-term rate. Each purchase has its own holding period, which matters if you buy in through automatic investments or dividend reinvestment, because every batch of shares is on its own clock.

Two Ways Long-Term Gains Reach You

Capital Gain Distributions from the Fund

Mutual funds don’t keep the profits from their internal trading. To hold their status as regulated investment companies, funds must distribute at least 90% of their taxable income to shareholders each year.⁴ When a fund manager sells a stock or bond at a profit inside the portfolio, that gain flows through to you as a capital gain distribution, whether or not you sold any of your own shares.

Here’s the part that surprises new investors: the long-term or short-term classification of these distributions depends on how long the fund held the underlying security, not how long you’ve owned your fund shares. If the fund held a stock for 14 months before selling, you receive a long-term capital gain distribution regardless of whether you bought into the fund two years ago or two weeks ago. Buying shares shortly before a fund’s annual distribution date can leave you with a tax bill on gains that accrued long before you ever owned the fund.

Your fund reports these distributions on Form 1099-DIV, with long-term capital gain distributions in box 2a.⁵ Because the fund controls when it sells inside the portfolio, you have no say in the timing of these distributions or the tax that comes with them.

Gains When You Sell Your Own Shares

The second way you realize long-term gains is by selling or redeeming your mutual fund shares. This one you control. Your gain equals the sale proceeds minus your cost basis, which generally includes what you paid for the shares plus any reinvested dividends and capital gain distributions you already paid tax on. The brokerage reports the sale on Form 1099-B, showing acquisition date, sale date, and gross proceeds.⁶ If you held the shares more than a year, the profit qualifies for long-term rates.²

One trap worth knowing: swapping shares from one mutual fund into another inside the same fund family is not tax-free. The IRS treats every exchange as a taxable sale, and you report any gain or loss in the year the exchange happens.⁷ Long-term or short-term still turns on how long you held the shares you gave up.

The 2026 Long-Term Capital Gains Brackets

Federal law taxes long-term gains at three rates: 0%, 15%, and 20%.⁸ Which rate applies depends on your total taxable income and filing status. For 2026:¹

0% rate: single filers with taxable income up to $49,450; married filing jointly up to $98,900; head of household up to $66,200.
15% rate: single filers from $49,451 to $545,500; married filing jointly from $98,901 to $613,700; head of household from $66,201 to $579,600.
20% rate: any taxable income above the 15% ceilings.

Compare that to the 37% top ordinary rate that applies to short-term gains.³ The gap between 20% and 37% at the top, plus the chance of paying nothing at all in the 0% bracket, is the whole reason the one-year mark matters.

The 3.8% Surtax on Higher Incomes

Higher earners owe an additional 3.8% on investment income, including long-term gains from selling fund shares and long-term capital gain distributions from the fund. This Net Investment Income Tax applies when your modified adjusted gross income crosses $200,000 for single filers or $250,000 for married couples filing jointly.⁹ The thresholds are fixed in the statute and have not been adjusted for inflation since the tax took effect in 2013.¹⁰

The 3.8% applies to the lesser of your net investment income or the amount by which your modified AGI exceeds the threshold. For someone in the 20% long-term bracket who also owes the surtax, the combined federal rate on long-term gains reaches 23.8%. Still well below the 40.8% that would apply to short-term gains at the same income level.

Using Losses to Reduce What You Owe

You don’t owe tax on every dollar of gains if you also have losing investments. Federal law lets you net gains and losses. First, combine all long-term gains and losses into a single net figure; do the same for short-term. If one category is a net gain and the other a net loss, they offset each other.¹¹

If your total losses exceed your total gains for the year, you can deduct up to $3,000 of net losses against ordinary income ($1,500 if married filing separately).¹¹ Anything beyond $3,000 carries forward indefinitely to future years. A big loss in one year can quietly reduce your tax bill for many years to come.

Capital gain distributions from the fund count as gains in this netting process. Receive a $5,000 long-term capital gain distribution, sell another investment at a $5,000 long-term loss, and the two cancel out.

Watch Out for the Wash Sale Rule

Investors sometimes try to lock in a loss by selling fund shares and buying them back the next day. The wash sale rule blocks it. If you sell shares at a loss and buy the same fund (or a substantially identical one) within 30 days before or after the sale, the loss is disallowed on your current return.¹²

The loss isn’t gone forever. The disallowed amount is added to the cost basis of the replacement shares, and the original shares’ holding period carries over. You just lose the immediate tax benefit. The rule reaches across all your accounts, including IRAs, accounts at different brokerages, and purchases in your spouse’s accounts. Buying a different fund that tracks the same index could also be treated as substantially identical.

Reporting the Gains at Tax Time

Two forms from your brokerage do most of the work. Form 1099-DIV reports capital gain distributions from the fund in box 2a.⁵ Form 1099-B reports any shares you personally sold, with the dates and proceeds needed to figure the gain.⁶

If capital gain distributions are your only capital gains for the year and you have no capital losses, you may be able to report them directly on Form 1040 without filing Schedule D.¹³ Add share sales, losses, or the netting process into the mix and Schedule D becomes necessary. Keep the brokerage statements as they arrive during the year. Reconstructing cost basis and holding periods in April is a much harder job than filing one.

1
Tax Foundation. 2026 Tax Brackets and Federal Income Tax Rates
2
Office of the Law Revision Counsel. 26 USC 1222 – Other Terms Relating to Capital Gains and Losses
3
Internal Revenue Service. Federal Income Tax Rates and Brackets
4
Office of the Law Revision Counsel. 26 USC 852 – Taxation of Regulated Investment Companies and Their Shareholders
5
Internal Revenue Service. Instructions for Form 1099-DIV
6
Internal Revenue Service. Instructions for Form 1099-B
7
Internal Revenue Service. Publication 550 (2025), Investment Income and Expenses
8
Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed
9
Office of the Law Revision Counsel. 26 US Code 1411 – Imposition of Tax
10
Internal Revenue Service. Questions and Answers on the Net Investment Income Tax
11
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
12
Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities
13
Internal Revenue Service. Instructions for Schedule D (Form 1040)