What is a good expense ratio for an index fund?

For broad market index funds and ETFs in 2026, expense ratios below 0.10% are good, and below 0.05% are excellent. The Fidelity ZERO funds charge 0.00%. Vanguard, iShares, and Schwab broad market ETFs charge 0.03% to 0.04%. There is essentially no performance justification for paying above 0.10% for a plain index fund tracking a major benchmark like the S&P 500 or total stock market.

Does a higher expense ratio guarantee an actively managed fund?

No, though most high-expense-ratio funds are actively managed. Some specialty index funds, niche ETFs, and leveraged or inverse ETFs charge 0.50% to 1.0%+ while still tracking an index mechanically. Always check whether higher fees are accompanied by a genuine active management strategy with a verifiable track record.

How does the expense ratio show up on my statement?

Expense ratios are never charged as a visible line item on your statement. They are deducted directly from the fund's assets before the NAV (net asset value) is calculated each day. If a fund's investments earned 8% and the expense ratio is 0.50%, the NAV increases by only 7.5% -- the fee is invisible but real.

Investment & Wealth

Expense Ratio Impact Calculator

Compare how different fund expense ratios erode returns over time and quantify the long-term cost difference.

Compare Fund Expenses

Initial Investment ($)

Expected Annual Return (%)

Fund A Expense Ratio (%)

Fund B Expense Ratio (%)

Time Horizon (Years)

Fee Impact Analysis

Enter fund details and click compare.

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Introduction

A 1% expense ratio on a mutual fund sounds trivial. On a $200,000 portfolio earning 8% gross over 30 years, it is not. The index fund at 0.04% grows to $1,993,000. The actively managed fund at 1.0% grows to $1,612,000. The 0.96% annual fee difference cost the investor $381,000 -- nearly double the original investment -- lost to fees. This is not a hypothetical; it is the math that drove the Vanguard Group's entire founding philosophy, summarized by John Bogle as "In investing, you get what you don't pay for." The Investment Company Institute's 2026 Factbook confirms that average equity mutual fund expense ratios have fallen to 0.42% while index fund averages sit at 0.05% -- but plenty of high-fee products remain. This calculator shows you precisely what any expense ratio costs your portfolio over your chosen time horizon.

What This Calculator Does

This expense ratio impact calculator compares the long-term wealth difference between two funds with different annual expense ratios. Enter your initial investment, expected annual gross return (before fees), and the expense ratios of the two funds you are comparing. The calculator shows final portfolio value under each scenario, the total dollar cost of the higher expense ratio compounded over your time horizon, and the percentage of wealth lost to fees -- making the fee difference concrete rather than abstract.

The Formula

Net Return = Gross Return - Expense Ratio | Final Value = Initial x (1 + Net Return)^Years | Fee Cost = Value at Lower ER - Value at Higher ER

An expense ratio is deducted from the fund's assets each year, effectively reducing the annual return by the expense ratio percentage. A fund earning 8% gross with a 0.75% expense ratio delivers 7.25% net annually. The compounding effect means this small annual drag grows exponentially over time. Because the fee is applied to the entire growing balance each year, not just the original investment, the dollar cost of high fees accelerates as the portfolio grows.

Step-by-Step Example

Set up the comparison

Initial investment: $150,000. Gross annual return assumption: 8% (based on historical broad market average). Time horizon: 25 years.

Fund A: low-cost index fund

Expense ratio: 0.04% (typical for Vanguard/Fidelity total market index). Net return: 7.96%. Final value: $150,000 x (1.0796)^25 = $150,000 x 6.89 = $1,033,500.

Fund B: actively managed fund

Expense ratio: 0.85% (typical for active equity mutual fund). Net return: 7.15%. Final value: $150,000 x (1.0715)^25 = $150,000 x 5.72 = $858,000.

Quantify the fee cost

Total cost of higher expense ratio over 25 years: $1,033,500 - $858,000 = $175,500. As a percentage of total possible wealth: 17.0% of your portfolio was surrendered to the higher-fee fund -- from an 0.81% annual fee difference.

Real-World Use Cases

401(k) Fund Selection

An employee's 401(k) plan offers two S&P 500 index funds: an institutional fund at 0.03% and a retail fund at 0.58%. On a $80,000 balance with 20 years to retirement and 7% gross return: the 0.03% fund grows to $309,000, the 0.58% fund grows to $279,000. The fee difference costs $30,000 in retirement savings from funds tracking the identical index.

Evaluating Active vs. Passive Management

A large-cap active fund charges 1.1% with a claimed 1% annual outperformance over the index. Net of fees, it delivers the same return as the index. After taxes on higher turnover, the active fund likely underperforms net. SPIVA data consistently shows 80% to 90% of active funds underperform their benchmark net of fees over 10+ year periods.

Financial Advisor Fee Analysis

An advisor charges 1.0% AUM (assets under management) annually on a $500,000 portfolio, plus the fund's expense ratios averaging 0.15%. Total all-in fee: 1.15%. Gross return: 7%. Net after all fees: 5.85%. Over 20 years, the fee structure costs approximately $380,000 versus a self-managed 0.10% expense ratio portfolio -- the cost of the advisory relationship.

Comparison

Fund Type	Typical Expense Ratio	$100K at 8% Gross / 30 Years	Lost to Fees vs 0.03%
Ultra-low index (e.g., FZROX)	0.00%	$1,006,000	$0
Low-cost index (e.g., FSKAX)	0.015%	$1,000,000	$6,000
Standard index ETF	0.03% to 0.05%	$995,000	$11,000
Asset allocation fund	0.10% to 0.20%	$975,000	$31,000
Average active equity fund	0.42%	$930,000	$76,000
High-fee active fund	0.85% to 1.0%	$860,000 to $835,000	$146,000 to $171,000
Variable annuity subaccount	1.5% to 2.5%	$700,000 to $550,000	$306,000 to $456,000

Common Mistakes to Avoid

Dismissing small fee differences as inconsequential. The psychological barrier of 'it's only 0.50% more' is exactly what fund companies rely on. On a $250,000 portfolio over 30 years, 0.50% costs approximately $350,000 in foregone wealth -- not a rounding error.
Comparing expense ratios without considering the full cost of ownership. Some funds have low expense ratios but high transaction costs, sales loads (front-end or back-end fees), or 12b-1 marketing fees. Look at the total annual fund operating expense and any load charges.
Assuming a higher expense ratio means better management. SPIVA research and decades of academic evidence show no consistent relationship between expense ratio and fund performance before fees. After fees, higher-cost funds systematically underperform lower-cost alternatives in most asset classes.
Ignoring tax efficiency in taxable accounts. High-turnover active funds generate more taxable capital gains distributions than low-turnover index funds. In taxable accounts, the tax drag from distributions adds to the total cost disadvantage of active management.

Frequently Asked Questions

Accuracy and Disclaimer

Expense ratio comparisons use simplified assumptions of constant annual returns and constant expense ratios over the modeled period. Actual fund returns and fees may change year to year. The gross return assumption does not imply that any specific return is achievable or guaranteed. This calculator is for educational comparison purposes only and does not constitute investment advice or a recommendation of any specific fund or investment product.

Conclusion

The expense ratio comparison is straightforward arithmetic, but its implications for long-term wealth are not. Every basis point of expense ratio saved compounds into meaningful additional wealth over decades. After comparing fund expenses, use the Portfolio Rebalancing Calculator to manage your allocation across low-cost funds, and the FIRE Number Calculator to see how lower expense ratios accelerate your path to financial independence by improving your effective net return.