Mutual Fund Capital Gains Distributions

A mutual fund manager who sells appreciated stock during the year realizes a capital gain, and by law the fund must pass that realized gain through to shareholders as a capital gains distribution, usually paid once a year near December. The catch: this happens regardless of whether the fund's overall price rose or fell that year, and regardless of whether you personally have owned the fund long enough to have benefited from the appreciation being taxed.

This creates the well-known "phantom gain" problem — buy a fund in November, and by December you can receive a taxable distribution built entirely from gains the fund earned before you owned a single share, even while the fund's net asset value has since dropped due to a market downturn. The distribution isn't extra money on top of your holding; it's actually paid out of the fund's own net asset value, which drops by the distribution amount on the payment date, but the tax bill is real regardless.

For example, a fund trading at $20 per share distributes $2 of capital gains: the share price drops to $18, and every shareholder of record owes capital gains tax on that $2, even a shareholder who bought at $20 last month and is sitting on a loss.

ETFs mostly avoid this through their in-kind creation/redemption mechanism, which lets them offload appreciated securities without triggering a taxable sale inside the fund — a major reason ETFs are generally more tax-efficient than mutual funds holding similar assets.