What A Fund's Expense Ratio Actually Costs You

A fund's expense ratio is the annual percentage of your holding taken to run it. It is deducted from the fund's assets rather than billed to you, which is precisely why it attracts so little attention — no payment ever leaves your account.

The compounding

The cost is not the annual percentage. It is that percentage, applied every year, to a balance that would otherwise have continued growing.

Over a few years the difference between a low-cost index fund and an actively managed fund charging several times as much is modest. Over the thirty or forty years of a working life, the gap becomes a substantial fraction of the final balance. This is arithmetic rather than opinion, and it is the strongest argument in favor of low-cost funds.

What you are paying for

A higher fee buys active management — someone selecting holdings in the expectation of beating a benchmark. Some managers do, in some periods.

The persistent finding across decades of research is that identifying in advance which managers will outperform over long horizons is extremely difficult, and that fees are one of the few reliable predictors of relative returns. Lower-cost funds start each year ahead by the difference in fees.

The costs beyond the ratio

The expense ratio excludes trading costs inside the fund, which do not appear in it. A fund that trades heavily incurs costs you never see itemised. Portfolio turnover, which is disclosed, is a rough guide.

In a taxable account, high turnover also generates distributions you pay tax on in years you sold nothing.

What to do

Look up the expense ratio of everything you hold — it is in the prospectus and on any fund page. Compare it against a broad index fund covering similar territory.

If you are paying substantially more, the question is what you are receiving for it. Sometimes there is a real answer. Frequently the honest answer is that the fund was chosen years ago and never reviewed.

This is general information, not financial advice. Nothing here is a recommendation to buy or sell anything; speak to a licensed adviser about your own position.