On this page
  1. What happens to the basis
  2. Why an index ETF already does this
  3. The practical reading
  4. Sources

“Return of capital” sounds like getting your own money back, untaxed. That is exactly what it is, and it is also why it is not a tax saving. The tax code has three buckets for a fund’s payout, filled in order.

  1. Dividend, up to the fund's earnings Taxable income in the year received. Ordinary or qualified or 60/40 depending on what the fund earned.
  2. Return of capital, once earnings are used up Not taxed now. Each dollar reduces your cost basis by a dollar.
  3. Capital gain, once basis reaches zero Taxed as a gain in the year received.

An option-income fund pays a fixed monthly target whether or not it earned that much, and the fund can time its option gains and losses so that its taxable earnings stay low. The payouts run ahead of earnings and land in the second bucket. One large fund classified 99.6% of its 2025 payouts as return of capital while its share price rose, so this is accounting, not the fund handing back principal.

What happens to the basis

Three declining lines of remaining cost basis per $100 invested on a flat share price: at a 14.4% payout the basis reaches zero in year seven, at 12.2% in year nine, at 8% in year thirteen.
Cost basis per $100 invested, on a flat share price, at three current payout rates. Once basis is gone, every payout is a taxable gain that year. An illustration, not a forecast.

A $100 lot receiving a 14.4% payout loses $14.40 of basis a year. In about seven years the basis is zero. From then on the same payout is a capital gain in the year received, and when the shares are finally sold, the whole sale price is gain too. The tax was moved, not removed.

Why an index ETF already does this

An index ETF holder who never sells has 100% of the appreciation deferred at the same 35% rate, until any year of their choosing, with no basis clock running down. Return of capital only adds something when cash is needed before then, and even then it defers tax on the whole cash amount at the cost of the fund’s return gap against the index. The one case where the deferral becomes permanent is the same one it always is: hold until the basis steps up at death.

The practical reading

  • Return of capital is fine. It is simply a deferral, the same one a plain index ETF provides without a payout.
  • A lot can shelter at most its own original cost. After that the label changes to capital gain on its own.
  • In an IRA none of this exists; everything comes out as ordinary income on withdrawal, so the label is irrelevant there.