Small Fees, Big Differences: How Fund Costs Compound Over 30 Years

Of all the things an investor can control, costs are the most reliable. You cannot know next year’s market return, but you know exactly what your funds charge. And because fees compound just as returns do, small-sounding differences grow large.

The expense ratio

Every mutual fund and exchange-traded fund (ETF) charges an annual expense ratio, a percentage of your assets deducted from the fund’s returns. You never see a bill; the fee is simply taken out of the fund’s value. Broad-market index ETFs from the largest providers charge as little as 0.03%–0.10% a year. Actively managed funds commonly charge 0.5%–1% or more, and financial advisers may add a similar fee on top.

A worked example

Suppose you invest $10,000 once and leave it for 30 years, and the investments earn 7% a year before costs. Here is what you end with at different fee levels:

Annual cost	Net return	Value after 30 years	Lost to fees
0% (no fee)	7.00%	$76,123	—
0.05%	6.95%	$75,063	$1,060
0.20%	6.80%	$71,968	$4,155
1.00%	6.00%	$57,435	$18,688

A fee of 1% a year, which sounds trivial, cost almost 25% of the ending value. The reason is compounding: each dollar paid in fees is a dollar that does not earn returns for the remaining years.

Notice also that in the first year the 1% fee costs only $100. Over 30 years it costs almost $19,000, because you pay it on a growing balance every year and lose the growth those payments would have earned.

Does the higher fee buy better performance?

It would be worth paying 1% if it reliably bought more than 1% of extra return. The evidence says it usually does not. S&P Dow Jones Indices publishes a regular scorecard (SPIVA) comparing actively managed funds with their benchmark indexes. Over periods of 10 to 20 years, the large majority of U.S. large-cap active funds have trailed the S&P 500 after fees, and the funds that beat their benchmark in one period rarely keep doing so in the next.

The logic behind this was set out by economist William Sharpe in a short 1991 article, “The Arithmetic of Active Management”. Before costs, the average actively managed dollar must earn the market return, because together active investors hold the market. After costs — which are higher for active management — the average active dollar must earn less than the average passive dollar. Some active managers will beat the market, but identifying them in advance is hard.

Fees you might not see

The expense ratio is not the only cost:

• Trading costs inside the fund (commissions and bid-ask spreads) are not included in the expense ratio. High-turnover funds incur more.
• Sales loads: some funds charge a commission when you buy or sell.
• Advisory fees, often around 1% of assets a year, on top of fund fees.
• Taxes: funds that trade often can distribute capital gains that are taxable in ordinary (non-retirement) accounts.

How to check what you pay

1. Look up each fund’s expense ratio on its fact sheet or the provider’s website.
2. Ask your adviser for the total annual cost in dollars, including advisory and fund fees.
3. Multiply your total percentage cost by your balance. On $200,000, a 1.5% all-in cost is $3,000 a year — every year.

The takeaway

Costs are not the only thing that matters: diversification, asset allocation and your own behavior in down markets matter too. But costs are the one factor that works against you with certainty. Every 0.1% saved is yours to compound for decades.