Mutual Fund Fee Impact Calculator

See how much expense ratios cost you over time. Compare high-fee funds to low-cost index funds.

By Konstantin Iakovlev · Updated April 2026 · Source: SEC

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%
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Balance (with fees)

$424,785.11

Total Fees Paid

$41,310.60

% of Returns Lost

11.3%

Fee Impact Summary

Initial Investment$100,000.00
Balance with 0.5% Fee$424,785.11
Balance with No Fees$466,095.71
Balance at Index (0.03%)$463,513.12
Cost of Fees$41,310.60
Returns Lost to Fees11.3%

Fee Impact Over Time

Year 10$206,103.16 ($9,789.34 in fees = 8.4% of returns)
Year 20$424,785.11 ($41,310.60 in fees = 11.3% of returns)

What You Could Save

Your fund (0.5%)$424,785.11
Index fund (0.03%)$463,513.12
Switching to index saves$38,728.01

Use the Mutual Fund Fee Impact Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

Expense ratios look trivial on a fund prospectus, but across decades they quietly drain a portfolio. This tool traces that drain year by year, showing how a high-fee actively managed fund can finish 2026 hundreds of thousands of dollars behind a comparable low-cost index fund. Seeing the gap side by side is the point: it turns an abstract percentage into a concrete dollar decision.

Projections rely on a compound interest formula adjusted for the annual expense ratio. The model grows your initial investment plus each year's contributions, then strips the expense ratio out of the annual return before compounding into the next year. Specifically: Future Value = P * (1 + (r - e))^n + C * (((1 + (r - e))^n - 1) / (r - e)), where P is the initial investment, r is the assumed annual return, e is the expense ratio, n is the number of years, and C is the annual contribution.

Treat the output as a projection, not a promise, since real market returns swing well beyond any single estimate. Fees are only one lens; fund performance, asset allocation, and your broader goals all belong in the decision. The most underrated factor is compounding itself, where a mere 0.5% difference in fees snowballs into a massive gap over 30 or more years.

Example: High-Fee vs. Low-Cost Fund Over 30 Years

  1. 1 Let's compare two funds: Fund A with a 1.00% expense ratio and Fund B with a 0.10% expense ratio. You invest an initial $10,000 and contribute $5,000 annually for 30 years, assuming an average annual market return of 7%.
  2. 2 For Fund A (1.00% expense ratio), the effective annual return is 6.00% (7% - 1%). For Fund B (0.10% expense ratio), the effective annual return is 6.90% (7% - 0.1%). We then apply these effective returns to the compound interest formula over 30 years.
  3. 3 After 30 years, Fund A would grow to approximately $532,400. Fund B, however, would accumulate to an impressive $698,900.
  4. 4 This example demonstrates a staggering difference of $166,500 over 30 years, purely due to a 0.90% difference in expense ratios. By choosing the low-cost fund, you've significantly boosted your wealth accumulation by 2026.

Source: SEC · Last updated: April 2026

Frequently Asked Questions

What is a good expense ratio for a mutual fund?
Index funds typically charge 0.03-0.20%, which is considered excellent. Actively managed funds average 0.50-1.00%. Any expense ratio above 1% should be scrutinized carefully, as high fees drastically reduce long-term returns.
How much do expense ratios cost me over 30 years?
On a $100,000 portfolio growing at 8%, a 1% expense ratio costs about $175,000 over 30 years compared to a 0.05% fund. That is nearly half your potential gains consumed by fees. Even a 0.50% difference compounds into tens of thousands of dollars lost.
Are index funds always cheaper than actively managed funds?
Almost always. The average index fund expense ratio is 0.05-0.10% versus 0.50-1.00% for active funds. Studies consistently show that over 80-90% of actively managed funds underperform their benchmark index over 15+ years, making low-cost index funds the better choice for most investors.

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