ETF vs Mutual Fund: What's the Difference?
How they trade, what they cost, and which one fits your portfolio.
ETFs and mutual funds both own a diversified basket of stocks, but they work differently: ETFs trade intraday like stocks, while mutual funds price once per day. The biggest practical difference is cost — average equity ETFs charged about 0.14% in 2025 versus 0.40% for stock mutual funds (Fidelity/Morningstar). On $50,000 plus $500 a month over 30 years, that gap can mean tens of thousands of dollars.
The short answer
An ETF (exchange-traded fund) is a fund you buy and sell on a stock exchange throughout the trading day, at whatever price the market sets. A mutual fund is a pooled fund you buy and sell once per day, at the fund's net asset value (NAV) after the market closes.
Both give you instant diversification in a single purchase. The differences that actually matter to most investors are cost, how they trade, tax efficiency, and minimums.
| ETF | Mutual Fund | |
|---|---|---|
| Trading | Intraday, like a stock | Once daily at closing NAV |
| Typical expense (2025 avg, equity) | ~0.14% | ~0.40% (active funds higher) |
| Minimum | ~1 share (or fractional) | Often $0–$3,000 |
| Tax efficiency | Generally higher | Can distribute more capital gains |
| Pricing | Market price all day | One NAV per day |
Where the real difference is: fees
Cost is the one difference that compounds silently over decades. Using 2025 averages from Fidelity/Morningstar, equity ETFs averaged about 0.14% and stock mutual funds about 0.40%; actively managed funds run higher still.
The table below shows what that means for a $50,000 portfolio with $500 monthly contributions over 30 years at a 7% gross return:
| Vehicle assumption | Net return | Total value |
|---|---|---|
| Index ETF at 0.03% | 6.97% | $1,008,597 |
| Typical ETF at 0.14% | 6.86% | $982,627 |
| Average stock mutual fund at 0.40% | 6.60% | $924,138 |
| Actively managed fund at 0.74% | 6.26% | $853,405 |
The 0.03% vs 0.74% gap alone is worth about $155,192 over 30 years on these inputs. That's the compounding cost of fees.
Run the ETF fee math with your own numbers →
How they trade
ETFs are priced continuously during market hours, so you can buy at a specific price and see the value move all day. Mutual funds are priced once, after the close, and all orders that day get that same NAV. For long-term, buy-and-hold investors this difference rarely matters — but it's why ETFs feel more like stocks.
Tax efficiency and minimums
ETFs generally distribute fewer capital gains because of how they create and redeem shares (in-kind), which matters most in a taxable account. In a retirement account, the tax difference mostly disappears.
On minimums, ETFs start at the price of one share (or a fractional share on many brokers); mutual funds often require $0 to $3,000 to start.
Which should you choose?
There's no universal winner. A low-cost index ETF and a low-cost index mutual fund holding the same stocks will perform almost identically. Choose based on your situation:
- If you want intraday trading, fractional shares, or taxable-account tax efficiency → ETFs tend to fit.
- If you prefer automatic investing by dollar amount and a familiar fund structure → a low-cost index mutual fund is fine, especially in a retirement account.
- In every case, the fund's cost and the strategy matter more than the wrapper. An expensive active fund loses to a cheap index fund far more often than the reverse.
Want to understand how fees compound? Read how much investment fees actually cost, and see how dollar-cost averaging vs lump sum changes the buying decision.
Risk & limitations
Fee averages change every year and differ by category — verify current numbers before relying on them. Tax efficiency depends on account type and fund structure. And for most long-term investors, intraday trading is a convenience, not an advantage; it can even lead to overtrading. This page is educational information, not personalized advice.