Under the tax pass-through rules of IRC §852, “Taxation of regulated investment companies and their shareholders”, a mutual fund must distribute substantially all of its realized net capital gains and dividend income to shareholders annually. Shareholders must pay tax on these distributions in the year they are paid — even if they reinvested 100% of the proceeds and never sold a single share of the fund.
This structure creates a severe tax hazard known as “buying the dividend” or “buying a distribution”. Mutual funds typically declare their annual capital gains distributions in November and December. If you purchase shares in a taxable account immediately before the fund’s ex-dividend or record date, you will receive a taxable distribution representing gains that accrued in the fund’s portfolio long before you became a shareholder. The fund NAV will drop by the amount of the distribution, leaving your total economic value unchanged, but you will owe immediate capital gains taxes (federally up to 20% under IRC §1(h), plus the 3.8% NIIT under IRC §1411) on your own returned capital. Always review the fund’s estimated distribution calendar before deploying significant capital in the fourth quarter.