An expense ratio is the only price tag most investors never see charged. There is no invoice and no line on a statement — the fund takes it quietly out of its own assets, a sliver every day, and your balance is simply a little lower than it would have been. That is why a fee of half a percent sounds like nothing. On $10,000 it is $50 a year.
It is not $50 a year for long. Put $100,000 in a fund charging 0.50% and leave it for twenty years at a 7% return before fees, and you end up with about $350,100. The same money in a 0.03% index fund such as VOO or VTI ends at about $384,700. The difference is $34,500 — roughly 9% of what you would have had. Nothing else in the comparison changes: same market, same return, same patience. Only the fee.
This guide explains how the fee is actually taken, what the funds people search for most really charge, why the damage grows faster than the fee itself, and the costs an expense ratio does not include.
The basicsWhat an expense ratio is — and how it is taken
The expense ratio is a fund's yearly operating cost expressed as a percentage of the money in it: the manager's fee, administration, custody, legal and index-licensing costs, and for some mutual funds a 12b-1 marketing fee. It is published in the fee table near the front of every prospectus, under "Annual Fund Operating Expenses".
You never pay it directly. The fund accrues it daily and deducts it from its assets, so it shows up only as a slightly lower share price (net asset value) and a slightly lower return. Every return a fund advertises is already after its expense ratio.
balance × expense ratio → $10,000 × 0.50% = $501 − (1 − expense ratio)ⁿ → 1 − 0.995²⁰ ≈ 9.5%its expense ratio − the index fund's → 0.64% − 0.03% = 0.61 pointsThe second line is the one to remember. A fee is not charged on what you put in — it is charged on everything you have, every year, including the growth that earlier years produced. Over twenty years a 0.50% fee takes close to a tenth of the balance; a 1% fee takes nearly a fifth.
Real fundsWhat the funds people search for actually charge
The spread is wider than most investors expect — from three hundredths of a percent to well over one and a half.
VOO / VTI
- What it is
- Vanguard S&P 500 / total U.S. market ETFs
- Expense ratio
- 0.03%
- Per $10,000 a year
- $3
Index equity mutual funds
- What it is
- ICI average, weighted by assets
- Expense ratio
- 0.05%
- Per $10,000 a year
- $5
SPY
- What it is
- State Street SPDR S&P 500 ETF Trust
- Expense ratio
- 0.0945%
- Per $10,000 a year
- $9.45
Index equity ETFs
- What it is
- ICI average, weighted by assets
- Expense ratio
- 0.14%
- Per $10,000 a year
- $14
QQQ
- What it is
- Invesco Nasdaq-100 ETF
- Expense ratio
- 0.18%
- Per $10,000 a year
- $18
Actively managed equity mutual funds
- What it is
- ICI average, weighted by assets
- Expense ratio
- 0.64%
- Per $10,000 a year
- $64
ARKK
- What it is
- ARK Innovation ETF, actively managed
- Expense ratio
- 0.75%
- Per $10,000 a year
- $75
Median equity fund share class
- What it is
- The fund in the middle of the list, not weighted
- Expense ratio
- 0.99%
- Per $10,000 a year
- $99
Expensive equity share classes
- What it is
- 90th percentile
- Expense ratio
- 1.84%
- Per $10,000 a year
- $184
| Fund or benchmark | What it is | Expense ratio | Per $10,000 a year |
|---|---|---|---|
| VOO / VTI | Vanguard S&P 500 / total U.S. market ETFs | 0.03% | $3 |
| Index equity mutual funds | ICI average, weighted by assets | 0.05% | $5 |
| SPY | State Street SPDR S&P 500 ETF Trust | 0.0945% | $9.45 |
| Index equity ETFs | ICI average, weighted by assets | 0.14% | $14 |
| QQQ | Invesco Nasdaq-100 ETF | 0.18% | $18 |
| Actively managed equity mutual funds | ICI average, weighted by assets | 0.64% | $64 |
| ARKK | ARK Innovation ETF, actively managed | 0.75% | $75 |
| Median equity fund share class | The fund in the middle of the list, not weighted | 0.99% | $99 |
| Expensive equity share classes | 90th percentile | 1.84% | $184 |
Source: CalculatorAI · calculatorai.app · Vanguard; State Street; Invesco; ARK ETF Trust Form N-CSRS (period ended Jan 31, 2026); ICI, Trends in the Expenses and Fees of Funds, 2025
Two things stand out. First, the averages investors actually pay are low because money has moved to the cheapest funds — the asset-weighted average for index equity mutual funds is 0.05%. Second, the typical fund on offer is not cheap at all: the median equity mutual fund share class charges 0.99%, and one in ten charges 1.84% or more. If you pick from a fund list — a workplace plan menu, a broker's screener — rather than by ticker, the median is the number to expect unless you check.
The pairs people compare most are close to each other. SPY vs VOO vs IVV is a 0.0645-point gap on the same index; VOO vs QQQ is 0.15 points, and there the fee is the smallest difference between the funds. The gap that matters is between an index fund and an actively managed one: 0.61 points for the average active equity fund, nearly ten times the SPY–VOO difference.
Twenty yearsWhat the fee costs in dollars
Here is the same $100,000 in each fund for twenty years. The model gives every fund an identical 7% gross return, compounds it monthly and deducts the expense ratio monthly, so the only thing that differs from row to row is the fee.
The 0.50% fund ends $34,517 behind the 0.03% index fund. The median equity fund share class, at 0.99%, ends $67,222 behind.
Show these figures as a table
| Value ($ after 20 years) | |
|---|---|
| 0.03% · VOO / VTI — $384,654 | 384,654 |
| 0.18% · QQQ — $373,284 | 373,284 |
| 0.50% fund — $350,136 | 350,136 |
| 0.64% · average active equity fund — $340,464 | 340,464 |
| 0.75% · ARKK — $333,051 | 333,051 |
| 0.99% · median equity share class — $317,431 | 317,431 |
| 1.84% · 90th percentile — $267,752 | 267,752 |
Source: CalculatorAI · calculatorai.app · CalculatorAI arithmetic, drafts/expense-ratios-numbers.mjs
The gap is bigger than the fees you paid, and that is the part people miss. Against a world with no fee at all, the 0.50% fund leaves you $36,800 short after twenty years — but only $20,000 of that was ever taken as fees. The other $16,800 is growth those fees would have earned if they had stayed invested. A fee costs you the money and everything the money would have become.
$100,000, twenty years, a 0.50% fee
At a 7% gross return the balance with no fee at all would reach about $387,000. The 0.50% fund ends at $350,136. Of the $36,832 shortfall, $20,021 is the fee itself, charged a little each month on a growing balance; $16,811 is the growth that money would have earned had it stayed invested. Compared with a 0.03% index fund instead of a fee-free one, the gap is $34,517.
Time and return make it worse, not better. Over thirty years the same 0.50% versus 0.03% gap is $99,200 at 7%, and $227,500 if the market returns 10% — the share of the balance lost is identical (13.2%), but a bigger balance pays a bigger fee. A good market does not dilute an expensive fund; it feeds it.
If you invest monthly rather than all at once, the damage is smaller, because most of your money has been in the fund for less than the full twenty years. $500 a month for twenty years ends at $252,800 in a 0.03% fund and $238,900 at 0.50% — $13,900 apart, 5.5% of the balance. Your own figures go through the Compound Interest Calculator: enter your expected return minus each fund's expense ratio and compare the two results.
The hurdleWhat a higher fee has to buy
An expensive fund is not automatically a bad one. It is a bet that the manager will beat the market by more than the fee. The average actively managed equity fund at 0.64% has to outperform an index fund by 0.61 percentage points every year, before any of its skill reaches you. ARKK at 0.75% has to clear 0.72 points.
You get the market, minus almost nothing
The return is the index return less three hundredths of a percent. There is no manager to be right or wrong, and the fee cannot turn a good year into a bad one.
You get the manager, minus 0.61 points more
To match the index fund after fees, the manager must beat the market by 0.61 points in an average year — and do it for twenty years in a row to be worth the $44,000 difference on $100,000. The fee is certain; the outperformance is not.
That does not mean nobody should own ARKK or an active fund. It means the fee is part of the bet and should be sized like one. Our guide to Cathie Wood's ARK trades looks at how to follow a fund like that without letting it take over the portfolio.
Your blended feeOne number for the whole portfolio
Most portfolios hold several funds, so the fee you pay is an average weighted by how much money sits in each one. Take a $50,000 portfolio split 60% VTI, 25% QQQ and 15% ARKK:
0.60 × 0.03% + 0.25 × 0.18% + 0.15 × 0.75% = 0.176%$50,000 × 0.176% ≈ $88(0.15 × 0.75%) ÷ 0.176% ≈ 64%A slice worth 15% of the money pays nearly two-thirds of the fees. That is the typical shape: one or two expensive holdings dominate the bill. To find them you need each fund's real weight, which is exactly what the Portfolio Tracker allocation view shows — multiply each weight by the fund's expense ratio and add them up. If two of the funds own the same stocks, you may be paying twice for one exposure; ETF overlap explained shows how to check.
Not in the ratioCosts the expense ratio leaves out
The expense ratio is the biggest recurring cost for most fund investors, but it is not the only one, and a low number does not guarantee a low total.
Trading costs inside the fund
Commissions and market impact from the fund's own buying and selling are not in the expense ratio. A high portfolio turnover figure in the prospectus is the warning sign.
Sales loads
Some mutual fund share classes charge a front-end or back-end load — a one-time percentage on the way in or out, listed separately in the fee table.
Advisory and account fees
An advisor charging 1% a year on top of a 0.03% fund takes you to 1.03% — more than the median active fund. On $100,000 over twenty years that is about $70,000 behind the fund alone.
Bid-ask spread
ETFs trade at a spread. For large funds like VOO or SPY it is a fraction of a cent per share; for small, thinly traded funds a single round trip can cost more than a year of the fee.
Taxes
A fund that distributes large capital gains can cost more in a taxable account than its expense ratio. That shows up in after-tax returns, not in the fee table.
Your 401(k) plan's own fees
Workplace plans may add recordkeeping or administration charges on top of each fund's ratio. They appear in the plan's annual fee disclosure.
The prospectus fee table has one more useful line: an example of what $10,000 would cost over one, three, five and ten years assuming a 5% annual return. It is a required section, so every fund shows it the same way — the quickest like-for-like comparison there is.
Where these numbers come from
Fund expense ratios were checked on September 29, 2026 from the sponsors: Vanguard (0.03% for VOO and VTI), State Street (0.0945% gross for SPY), Invesco (0.18% for QQQ) and ARK's semi-annual shareholder report on Form N-CSRS for the period ended January 31, 2026 (0.75% for ARKK). Industry averages come from the Investment Company Institute's Trends in the Expenses and Fees of Funds, 2025, published March 2026: asset-weighted averages of 0.64% for actively managed equity mutual funds, 0.05% for index equity mutual funds and 0.14% for index equity ETFs; and, across equity mutual fund share classes weighted equally, a median of 0.99% and a 90th percentile of 1.84%.
The growth figures are arithmetic in drafts/expense-ratios-numbers.mjs. Every fund gets the same 7% gross annual return, compounded monthly, with its expense ratio deducted monthly from the balance, so each dollar of difference is the fee alone. Real funds also differ in what they hold and how closely they track, and returns are never a steady 7% — the model deliberately removes both so the fee can be seen on its own. The 7% assumption is conservative for U.S. stocks, which makes the dollar gaps here smaller than they would be at the long-run 10% shown for comparison. Taxes, loads, advisory fees and trading costs are excluded. Nothing here is a recommendation to buy or sell any fund.
Frequently asked questions
What is a good expense ratio? For a broad index fund, under 0.10% — the largest U.S. stock index ETFs charge 0.03%. For an actively managed stock fund, anything well below the 0.64% industry average is cheap. Above 1% you are paying more than the typical fund on offer, and the manager has to earn it back every year.
How much does a 1% expense ratio cost over 20 years? About 18% of what you would otherwise have. At a 7% gross return, $100,000 in a fund charging 0.99% ends near $317,400 after twenty years, against $384,700 in a 0.03% index fund — about $67,000 less.
Is the expense ratio charged every year? It is charged continuously. The fund accrues it daily and deducts it from its assets, so there is no annual bill. You see it only as a lower share price and a lower return than the index the fund tracks.
Is a 0.50% expense ratio high? Not for an actively managed fund, where the average is 0.64%. It is high for an index fund: seventeen times VOO's 0.03%, and about $34,500 more in cost on $100,000 over twenty years at a 7% return.
Does the expense ratio include trading fees and commissions? No. The fund's own trading costs, sales loads, your broker's commissions, the ETF's bid-ask spread, advisory fees and taxes are all outside it. The expense ratio covers only the fund's ongoing operating costs.
