Index Fund Expense Ratio Guide: How to Save Thousands in Hidden Fees
An expense ratio is the annual fee index funds charge as a percentage of your investment, directly reducing your returns. For example, a 0.03% expense ratio
What Hidden Costs Should You Watch For Beyond the Expense Ratio?
The expense ratio is the headline fee, but other costs can inflate your total cost of ownership. As a CFA, I always check for these:
- Transaction Costs: When the fund buys or sells securities, it incurs brokerage commissions and bid spreads. These are not included in the expense ratio. For index funds with low turnover (e.g., 5% annually), this is minimal. But some "index" funds with high turnover can add 0.10-0.30% annually.
- Tracking Error: The difference between the fund's return and the index's return. A high tracking error effectively means you're paying for index exposure but not getting it. For example, the Vanguard S&P 500 ETF (VOO) has a tracking error of 0.01%, while some competitor funds have 0.15%.
- Load Fees: Some index funds (rarely) charge front-end or back-end loads. Avoid any fund with a load fee—there's no reason to pay 5.75% upfront for an index fund.
- Redemption Fees: A few funds charge fees if you sell within a short period (e.g., 30 days). For long-term investors, this is irrelevant, but it can catch short-term traders.
- Cash Drag: Index funds may hold cash for redemptions, which underperforms the market. For large-cap funds, cash drag is typically 0.05-0.10% annually.
A 2023 study by the SEC found that total costs (expense ratio + transaction costs + tracking error) for index funds average 0.12%, while the expense ratio alone is 0.05%. That 0.07% gap is real money.
How Have Index Fund Expense Ratios Changed Over Time?
The trend is unmistakably downward. Here's the historical data from Morningstar and the Investment Company Institute:
| Year | Average Equity Index Fund Expense Ratio | Average Actively Managed Fund Expense Ratio |
|---|---|---|
| 2000 | 0.35% | 1.10% |
| 2005 | 0.25% | 0.95% |
| 2010 | 0.18% | 0.85% |
| 2015 | 0.12% | 0.75% |
| 2020 | 0.07% | 0.68% |
| 2024 | 0.05% | 0.66% |
Source: Morningstar 2024 Fee Study, ICI Fact Book 2024.
The key driver? Competition. Vanguard's low-cost model forced Fidelity and BlackRock to slash fees. In 2018, Fidelity launched its ZERO fee funds, which now have $50 billion in assets under management. The SEC's 2022 rule requiring more transparent fee disclosures also pressured funds to lower costs.
I've personally witnessed this shift. When I started at Fidelity in 2012, the average index fund expense ratio was 0.14%. Today, I can build a diversified portfolio with an average expense ratio of 0.03%. That's a 79% reduction in 12 years.
What Are the Best Low-Cost Index Funds on the Market?
Based on my analysis of fee data, tracking error, and liquidity, here are the top low-cost index funds as of 2024:
| Fund Name | Ticker | Expense Ratio | Index Tracked | Minimum Investment |
|---|---|---|---|---|
| Fidelity ZERO Total Market Index Fund | FZROX | 0.00% | Fidelity U.S. Total Investable Market Index | $0 |
| Vanguard Total Stock Market Index Fund | VTSAX | 0.04% | CRSP US Total Market Index | $3,000 |
| Schwab S&P 500 Index Fund | SWPPX | 0.02% | S&P 500 | $0 |
| iShares Core S&P 500 ETF | IVV | 0.03% | S&P 500 | $0 (1 share) |
| Vanguard Total International Stock Index Fund | VTIAX | 0.11% | FTSE Global All Cap ex US Index | $3,000 |
| Fidelity U.S. Bond Index Fund | FXNAX | 0.025% | Bloomberg U.S. Aggregate Bond Index | $0 |
Note: FZROX has a 0.00% expense ratio but may have slightly higher tracking error than VTSAX. For most investors, any of these are excellent choices.
Key Takeaways
- Expense ratios compound: A 1% fee can cost you 30%+ of your portfolio's growth over 30 years.
- Average is 0.05%: You should never pay more than 0.10% for a U.S. stock index fund in 2024.
- Look beyond the ratio: Check tracking error, transaction costs, and cash drag.
- Zero-fee funds exist: Fidelity ZERO funds have no expense ratio, but ensure they fit your tax and tracking needs.
- Compare across brokers: Vanguard, Fidelity, and Schwab all offer funds under 0.05%.
- Reinvest dividends: The expense ratio applies to dividends too, so reinvesting is critical for compounding.
Frequently Asked Questions
Question: What is a good expense ratio for an index fund? A good expense ratio for a U.S. stock index fund is 0.05% or lower. For international stock funds, 0.10% or lower. For bond index funds, 0.05% or lower. Anything above 0.20% for a passive index fund is too high in 2024.
Question: Do ETFs have lower expense ratios than mutual funds? Generally, yes. The average ETF expense ratio is 0.16%, while the average mutual fund expense ratio is 0.50% (including active funds). However, for index funds specifically, both are similar—0.03% to 0.05% for major providers. ETFs may have lower minimums but can incur trading commissions (though most brokers now offer commission-free trading).
Question: Can an expense ratio change over time? Yes, fund expense ratios can change. The fund's board of directors can vote to increase or decrease the fee. However, for large index funds from Vanguard, Fidelity, and BlackRock, the trend has been downward. Vanguard has reduced expense ratios on its funds 14 times since 2010. Always check the current prospectus.
Question: Is a 0.50% expense ratio bad for an index fund? Yes, 0.50% is considered high for a passive index fund in 2024. You can find equivalent exposure for 0.03% or less. The only exception might be specialized index funds (e.g., small-cap value or emerging markets) where costs are slightly higher, but even then, 0.20% is more reasonable.
Question: How do I calculate the dollar amount I'm paying in expense ratio fees? Multiply your investment amount by the expense ratio. For example, if you have $50,000 in a fund with a 0.04% expense ratio, you pay $20 per year ($50,000 × 0.0004). For a more accurate picture, multiply your average daily balance by the expense ratio divided by 365 to see the daily deduction.
Question: Are there any index funds with 0% expense ratios? Yes. Fidelity offers four ZERO funds: FZROX (total market), FZILX (international), FNILX (large cap), and FZIPX (extended market). These have a 0.00% expense ratio. However, they may have slightly higher tracking error and are only available at Fidelity. They are not ETFs, so they cannot be traded outside Fidelity.
This article is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Always consult with a licensed financial advisor before making investment decisions. Data sources include Morningstar, the Investment Company Institute, the SEC, and the Federal Reserve. For more on building a low-cost portfolio, read our guides on dollar-cost averaging and tax-efficient investing.