Index Fund Expense Ratio Cost Calculator

Index funds are already cheap, so the difference between 0.03% and 0.20% feels trivial — until it compounds over 30 years on a six-figure portfolio. Compare two funds side by side and see exactly how many dollars the more expensive one costs you.

Initial Investment ($)

Monthly Contribution ($)

Fund A — Expense Ratio (%)

Fund B — Expense Ratio (%)

Gross Annual Return (%)

Holding Period (years)

📊 Actual 2026 Expense Ratios — Major Index Funds

Fund	Ticker	Expense Ratio	Cost per $100k/yr
Fidelity 500 Index	FXAIX	0.015%	$15
Schwab S&P 500 Index	SWPPX	0.02%	$20
Vanguard Total Stock Market	VTSAX	0.04%	$40
iShares Core S&P 500 ETF	IVV	0.03%	$30
Vanguard Total Intl Stock	VTIAX	0.11%	$110
Typical active large-cap fund	—	0.85%	$850
Typical bond index fund	—	0.05%	$50

The spread between the cheapest and most expensive S&P 500 index fund is 0.015% versus 0.20% — a 13x difference that sounds dramatic but equals $185 a year on $100,000. Over a 30-year compounding period on a growing balance, the same gap becomes tens of thousands of dollars.

📐 The Expense Ratio Drag Formula

Net Return = Gross Return − Expense Ratio

The ratio is deducted from the fund's return every single year

Cost = Balance × Expense Ratio

Charged on the whole balance, not on the year's gain

The mistake almost everyone makes

People compare expense ratios to their return — "0.2% is nothing next to 7%." That framing hides the real arithmetic. The fee is charged on the entire balance, every year. On a $500,000 portfolio, 0.20% is $1,000 annually, and that $1,000 would otherwise have compounded for the rest of your horizon.

How to use this calculator

Enter your investment amount and monthly contribution.
Enter the two expense ratios you are comparing as percentages (0.03, not 0.0003).
Set a realistic gross return — 7% is the conventional long-run stock assumption.
Read the "Cost of the Difference" card: that is the real switching benefit.

Ignore expense ratios below roughly 0.05% differences in a taxable account, where capital gains tax on switching can exceed the fee savings. In a tax-advantaged account, switching is essentially free.

💵 Why 0.2% Is Not "Basically Nothing"

An expense ratio is deducted from net asset value daily, so it never appears as a line item on a statement. That invisibility is exactly what makes it dangerous. On a $250,000 portfolio held for 30 years at a 7% gross return:

Expense Ratio	Ending Balance	Lifetime Fee Cost
0.03% (Fidelity/Schwab index)	$1,907,000	$43,000
0.20% (typical index ETF)	$1,783,000	$167,000
0.85% (typical active fund)	$1,459,000	$491,000
1.50% (advisor-sold fund)	$1,195,000	$755,000

The gap between 0.03% and 0.85% is $448,000 — more than the portfolio's starting value. Note the shape of the curve: most of the cost accrues in the later years, when the balance is largest. That is why the fee matters more to a 45-year-old than to a 25-year-old, and why switching late still pays.

🔍 What an Expense Ratio Does and Does Not Include

Included in the expense ratio	NOT included
Investment management fee	Brokerage commissions on trades
Administrative and legal costs	Front-end or back-end sales loads
12b-1 distribution fees	Advisory fee paid to a human advisor
Index licensing costs	Platform or custodial fees
Fund accounting	Redemption fees and short-term trading fees

Practical test: if a fund charges 0.05% but carries a 5.75% front-end load and a 1% annual advisor fee, the all-in cost is roughly 1.05% — twenty times the headline ratio. Always add the advisor's fee and any load to the published expense ratio before comparing funds.

Also check for fee waivers. Many funds list a gross expense ratio and a lower net expense ratio because the manager has contractually agreed to waive part of the fee — but often only through a stated expiration date. Use the net ratio if it is contractual, and expect the gross ratio to apply afterward.

❓ Frequently Asked Questions

What is a good expense ratio for an index fund?

Anything at or below 0.10% is excellent for US equity index funds, and the cheapest large-cap index funds now sit at 0.015% to 0.04%. International and specialty index funds typically run 0.05% to 0.20%.

Is 0.2% expense ratio too high?

Not unreasonable, but it is 5x to 13x the cheapest index funds in the same category. On a $500,000 portfolio over 30 years, the extra 0.17 percentage points versus a 0.03% fund costs roughly $150,000.

Do expense ratios compound?

Yes, indirectly. The fee reduces the balance on which future returns are earned, so each year’s fee also removes all future growth on that amount. This compounding effect is why a small ratio difference becomes a large dollar difference.

When is it not worth switching to a cheaper fund?

In a taxable account, if the embedded capital gains tax exceeds the present value of the fee savings. A rough test: switching makes sense when the ratio gap times your holding period exceeds your capital gains tax rate times the unrealized gain percentage.

Are ETF expense ratios lower than mutual funds?

Usually by a small margin. The same index is often available as an ETF at 0.03% and as a mutual fund at 0.04%. The larger factor is share class and whether you have access to institutional or Admiral shares, which can be lower still.

Where do I find a fund’s expense ratio?

The fund’s prospectus, its summary page on the issuer’s website, or Morningstar. Look for the net expense ratio, which reflects any contractual fee waivers, and check the waiver’s expiration date.

⚠️ Important Disclaimer: Expense ratios and returns in this calculator are user inputs used for hypothetical comparison. Fund expense ratios change and fee waivers expire; verify current figures in the fund prospectus. This tool does not account for taxes, sales loads, trading commissions, or advisory fees and is not investment advice.