If you own shares in a mutual fund you share in its profits. For example, when the fund’s underlying stocks or bonds pay income from dividends or interest, the fund pays those profits, after expenses, to its shareholders in payments known as income distributions. Also, when the fund has capital gains from selling investments in its portfolio at a profit, it passes on those after-expense profits to shareholders as capital gains distributions. You generally have the option of receiving these distributions in cash or having them automatically reinvested in the fund to increase the number of shares you own.

Of course, you have to pay taxes on the fund’s income distributions, and usually on its capital gains, if you own the fund in a taxable account. When you invest in a mutual fund you may have short-term capital gains, which are taxed at the same rate as your ordinary income—something you may try to avoid when you sell your individual securities. You may also owe capital gains taxes if the fund sells some investments for more than it paid to buy them, even if the overall return on the fund is down for the year or if you became an investor of the fund after the fund bought those investments in question.

However, if you own the mutual fund in a tax-deferred or tax-free account, such as an individual retirement account, no tax is due on any of these distributions when you receive them. But you will owe tax at your regular rate on all withdrawals from a tax-deferred account.

You may also make money from your fund shares by selling them back to the fund, or redeeming them, if the underlying investments in the fund have increased in value since the time you purchased shares in the funds. In that case, your profit will be the increase in the fund’s per-share value, also known as its net asset value or NAV. Here, too, taxes are due the year you realize gains in a taxable account, but not in a tax-deferred or tax-free account. Capital gains for mutual funds are calculated somewhat differently than gains for individual investments, and the fund will let you know each year your taxable share of the fund’s gains.