Fee drag calculator
See what investment fees cost over time. Compare funds by expense ratio and see the difference in your final balance.
Simulation inputs
Fund B must beat the market by +0.95% every single year just to match Fund A after fees.
Of Higher-fee fund's total fee drag of $116,158, $57,318 was fees paid directly and $58,840 was foregone compound growth.
Of Low-cost index fund's total fee drag of $6,420, $3,240 was fees paid directly and $3,180 was foregone compound growth.
Wealth trajectory & fee divergence
Navy shaded gap represents compound capital lost to fee divergence.
Educational tool only, not financial advice. This assumes constant returns and fees, and returns before fees are the same for both funds. Real returns vary and are not guaranteed. Cheaper funds are not always better for every investor.
Periodic milestone schedule
Accumulation checkpoints every 5 years plus the terminal year.
| Year | Total contributed | Zero-fee baseline | Low-cost index fund (0.05%) | Higher-fee fund (1%) | Difference (A − B) |
|---|---|---|---|---|---|
| Year 5 | $40,000 | $49,623 | $49,547 | $48,125 | +$1,422 |
| Year 10 | $70,000 | $105,197 | $104,885 | $99,145 | +$5,740 |
| Year 15 | $100,000 | $183,143 | $182,319 | $167,422 | +$14,897 |
| Year 20 | $130,000 | $292,465 | $290,669 | $258,791 | +$31,878 |
| Year 25 | $160,000 | $445,795 | $442,281 | $381,063 | +$61,218 |
| Year 30 | $190,000 | $660,849 | $654,429 | $544,691 | +$109,738 |
Fee sensitivity spectrum
See terminal wealth across standard expense ratio tiers using your current contribution profile.
| Expense ratio | Final balance | Fee drag vs zero fee | % of zero-fee balance lost | Difference vs Fund A |
|---|---|---|---|---|
0.05%Fund A | $654,429 | $6,420 | 1.0% | — |
0.25% | $629,431 | $31,418 | 4.8% | −$24,998 |
0.50% | $599,657 | $61,192 | 9.3% | −$54,772 |
1.00%Fund B | $544,691 | $116,158 | 17.6% | −$109,738 |
1.50% | $495,302 | $165,547 | 25.1% | −$159,127 |
2.00% | $450,907 | $209,942 | 31.8% | −$203,522 |
How this is calculated
An expense ratio represents the annual fee charged by an exchange-traded fund (ETF) or mutual fund to cover portfolio management, custodial operations, and administrative expenses.
Unlike an advisory invoice or a brokerage commission, expense ratios are never billed as a separate line item. Instead, the fund provider deducts the fee continuously and automatically from the fund underlying net assets. This directly reduces the daily net asset value (NAV) of every share you hold.
Net Annual Return = Gross Return − Total Fee Rate
Monthly Rate = (1 + Net Annual Return)^(1/12) − 1
Balance_(m) = Balance_(m−1) · (1 + Monthly Rate) + Monthly Contribution
Monthly fee_(m) = Balance_(m−1) × (Monthly Rate at zero fee − Monthly Rate at net return)
Fees paid along the way = sum of Monthly fee_(m) over all months.
This is the direct deduction only. Total fee drag also includes the growth those dollars would have earned.
The dual mechanics of fee drag
The total cost of an expense ratio consists of two distinct components:
- Direct fee deductions: The actual dollars subtracted from your fund balance each month to pay management fees.
- Foregone compound growth: The returns those deducted dollars would have earned had they stayed invested and compounded over the remaining decades. Depending on the horizon, foregone growth is often a comparable or larger share of the total cost than the direct deductions.
What is not included in this calculator
This calculator provides a clean, client-side mechanical comparison under constant hypothetical returns. It does not model:
- Taxes on dividends, capital gains distributions, or share liquidations.
- Bid-ask spreads and market execution slippage when trading fund shares.
- Sales loads (front-end or back-end charges) unless accounted for in starting balance.
- Year-to-year return volatility or sequence of returns variance.
Frequently asked questions
An expense ratio is the annual percentage of a fund assets deducted to cover management, administrative, and operating expenses. For example, a 0.05% expense ratio costs $5 per year for every $10,000 invested, while a 1.00% expense ratio costs $100 per year for that same $10,000.
Related resources
Low Overhead (Book 04)
Read Money Under the Hood, Book 04: deconstructing investment fees, expense ratios, and portfolio overhead.
Compound Interest Guide
First-principles breakdown of exponential growth mechanics, periodic additions, and recurrence relations.
Expense Ratio Term
Formal definition, NAV reduction mechanics, and mathematical properties of fund expense ratios.