Glossary · Investing & tax
What is Expense ratio?
The annual fee a fund (ETF or mutual fund) charges, expressed as a percentage of assets. A 0.10% expense ratio means $10/year on every $10,000 invested. Compounds heavily over decades.
Last updated April 30, 2026
How it works
An ETF or mutual fund holds a basket of assets on your behalf. The fund manager charges an annual fee — the expense ratio — to cover operations, paid by quietly subtracting the fee from the fund's assets. You never see a bill; the fee shows up as slightly lower fund performance vs the underlying basket.
Index funds (which just track a benchmark like the S&P 500) charge tiny expense ratios because they don't require active management. Actively-managed funds charge 5–20× more for the privilege of paying someone to make stock picks.
| Fund type | Typical expense ratio |
|---|---|
| Vanguard S&P 500 ETF (VOO) | 0.03% |
| Schwab Total Market ETF (SCHB) | 0.03% |
| iShares S&P 500 (IVV) | 0.03% |
| Average actively-managed mutual fund | 0.50–1.00% |
| Hedge fund | 2% + 20% of profits |
| Bitcoin spot ETF (e.g. IBIT) | 0.12–0.25% |
Example
Two funds tracking the same S&P 500 index over 30 years, $10,000 starting investment, 10% gross annual return:
- 0.03% expense ratio (VOO): Final value ~$172,000. Cumulative fees ~$2,000.
- 0.75% expense ratio (high-fee mutual fund): Final value ~$140,000. Cumulative fees ~$36,000.
Same exposure, same time, $32,000 difference. The high-fee fund eats nearly 20% of the gross return purely on fees, with no better performance to show for it.
This is why low-cost index investing — VOO, SCHB, VTI — has crushed actively-managed alternatives over multi-decade horizons. The fee compounds against you the same way returns compound for you.
Why it matters
The expense ratio is the single most predictive piece of information you can find about a fund's long-term returns. Studies consistently show:
- Past performance doesn't predict future performance. Most fund managers who beat the market in one decade don't in the next.
- Expense ratios DO predict. A high-fee fund will reliably underperform a low-fee equivalent over enough time.
- The honest case for actively-managed funds is narrow. Specialty exposure you can't get elsewhere, niche tax-advantaged structures, or specific strategies that genuinely earn their fees. For broad-market exposure, low-cost index funds win.
For crypto-related products, expense ratios on spot Bitcoin ETFs (BlackRock's IBIT at 0.12%, Fidelity's FBTC at 0.25%, etc.) are competitive with traditional ETFs. Buying BTC directly is fee-free for the holding period (you pay the trading fee once); the ETF is the easier route for IRA/401k accounts where direct crypto isn't allowed.
The rule of thumb: if you're choosing between two funds tracking the same thing, pick the lower expense ratio. Almost always.