Mutual fund and ETF fees: the expense ratio
Annual operating expenses are shown as a percentage of assets — the expense ratio — and quietly reduce your returns every year.
Sourced from official pages · Updated September 30, 2026💡 Key takeaways
- The expense ratio is the annual operating cost as a percentage of a fund’s average net assets.
- Shareholder fees such as sales charges are separate.
- A small fee difference compounds over decades.
- Find fees in the prospectus fee table or on your brokerage’s fund page.
What the fees are
Mutual funds and ETFs must disclose two categories of costs: shareholder fees (such as sales charges) and annual operating expenses, expressed as a percentage of the fund’s average net assets — the expense ratio. Operating expenses include management fees, distribution (12b-1) fees for some mutual funds, and other costs. ETFs typically do not have 12b-1 fees.
How much can it matter?
Because the fee is charged every year on the whole balance, a small difference compounds over decades. See it with your numbers in the investment fee calculator.
Where to find it
The fee table near the front of the fund’s prospectus lists the expense ratio and any shareholder fees. Your brokerage’s fund page also shows it.
Types of fund costs
| Cost | What it is |
|---|---|
| Expense ratio | Annual operating expenses as a % of assets, including management fees |
| Sales load | A sales charge when you buy or sell some mutual fund shares |
| 12b-1 fee | A distribution/marketing fee in some mutual funds |
| Trading costs | Commissions or bid/ask spread when trading ETFs |
How to compare
- Find each fund’s expense ratio.
- Compare against similar funds tracking the same index or category.
- Add sales charges and trading costs.
- Use the investment fee calculator to see the long-run effect.
🔤 Key terms
| Term | Meaning |
|---|---|
| Management fee | Fee for running the fund |
| 12b-1 fee | Marketing and distribution fee in some mutual funds |
| Load | Sales charge |
| Net expense ratio | Cost after waivers |
🧮 Illustration (hypothetical)
With $10,000 plus $500 a month for 30 years at a 7% gross return, a 0.10% fee leaves about $676,865 and a 1.00% fee about $562,483. The difference is what the higher fee costs, and it grows with time.
⚠️ Common mistakes to avoid
- Ignoring the expense ratio because it looks small.
- Overlooking sales charges.
- Paying for a fund that duplicates one you already own.
- Assuming higher fees mean better performance.
🛠️ Try it yourself
❓ Frequently asked questions
What is a good expense ratio?
Lower is generally better for similar funds; compare within a category.
Are ETF fees always lower?
No; compare each fund.
Where do fees show up?
They are taken from the fund’s assets, so you see them in performance rather than as a separate bill.
Do fee waivers last forever?
No; check when a waiver ends.
📚 Sources
This guide is general information, not financial, tax or legal advice. Rules and limits change; confirm with the sources above or a licensed professional.