ETF vs Mutual Fund: Which One Should You Buy?

Short answer: For most long-term investors, a low-cost index ETF is the better buy: it usually costs less, trades whenever the market is open, and rarely hands you a tax bill for gains you never sold. A mutual fund wins for automatic investing in exact dollar amounts, or when your 401(k) offers a good index mutual fund and no ETF option. The wrapper matters far less than the fee inside it — a 0.03% index fund beats a 1.00% fund in either wrapper.

What an ETF Is and What a Mutual Fund Is

An ETF — exchange-traded fund — is a basket of stocks, bonds or other assets whose shares trade on a stock exchange all day, like a single company's stock. You buy and sell through a brokerage account, at whatever price the market offers. The first US ETF, the SPDR S&P 500 ETF (SPY), launched in 1993.

A mutual fund is the older wrapper. The first US mutual fund dates to 1924. You buy shares from the fund company (or through a broker), and sell them back to the fund. There is no exchange and no live price: every order is filled once a day, at the fund's net asset value (NAV) — its holdings minus liabilities, per share.

Here is the point most comparisons miss: ETF and mutual fund are wrappers, not strategies. An index fund tracks a published benchmark, such as the S&P 500, instead of picking stocks by hand — and it can come in either wrapper. The same Vanguard Total Stock Market fund exists as VTSAX (mutual fund) and VTI (ETF), holding the same stocks in the same weights. The real choice is usually index versus active management, and the wrapper is the second decision.

ETF vs Mutual Fund at a Glance

Feature	ETF	Mutual fund
How you buy	On a stock exchange, through a broker	From the fund company or a broker
When it trades	All day while the market is open	Once a day, at the next NAV after the close
Price you get	Market price, which can sit above or below NAV	The NAV, calculated once per business day
Typical expense ratio	0.03% for the largest index ETFs	0.05% index funds; 0.64% active funds
Minimum investment	One share; $1 with fractional shares	Often $3,000 at Vanguard; $1,000 for target-date funds
Automatic investing	Depends on the broker	Built in at most fund companies
Capital gains distributions	Rare — about 5% of US ETFs in 2024	Common — about 40% in 2024
Limit and stop orders	Yes	No

How They Trade: Intraday Price vs End-of-Day NAV

The trading difference is the most visible one. The SEC's Investor Bulletin puts it plainly: ETF investors can sell their shares on the market at any time the market is open, at the market price, while mutual fund investors sell shares back to the fund at the next calculated NAV on any business day. NAV is typically struck once, after the 4 p.m. Eastern close.

A mutual fund order placed at 10 a.m. and one placed at 3 p.m. usually receive the same price — you will not know the exact price until the day ends. An ETF order fills at the live market price within seconds, and you can use limit and stop orders.

Intraday trading has a cost of its own: the ETF's market price can sit above or below its NAV — a premium or a discount. For large, heavily traded funds the gap is usually tiny, because authorized participants arbitrage it away; for thinly traded or niche ETFs it can be wider, so check it before you buy. Settlement is quick on both sides now: most US ETF trades settle one business day after the trade (T+1) under the SEC rule in force since 28 May 2024.

The Cost Gap: What the Averages Actually Are

The fee gap is between index and active, not between ETF and mutual fund as such. The Investment Company Institute's March 2026 report gives the asset-weighted averages for 2025:

Fund type	Average expense ratio (2025, ICI)	Cost per $10,000 a year
Index equity ETF	0.14%	$14
Index equity mutual fund	0.05%	$5
All equity mutual funds	0.40%	$40
Actively managed equity mutual funds	0.64%	$64
Median equity mutual fund share class	0.99%	$99

The average index mutual fund (0.05%) is actually cheaper than the average index ETF (0.14%), because the ETF average includes pricier niche and sector funds. The cheapest funds are the largest S&P 500 ETFs — VOO, IVV and VTI — all at 0.03%, or $3 a year on $10,000.

The long trend favors the investor: the average equity mutual fund charged 1.04% in 1996 and 0.40% in 2025 — a 62% drop — as money flowed into index funds. But the spread is still enormous, from 0.03% to well over 1% for funds that own roughly the same stocks, and that spread, compounded over decades, is the whole ballgame.

Watch for two extra charges the expense ratio does not show. Some mutual funds carry sales loads — a cut taken when you buy or sell — and some charge 12b-1 marketing fees of up to 0.25% a year. Vanguard funds never charge loads, but always check the prospectus. ETFs have no loads, but you pay the bid-ask spread on every trade: the SEC's bulletin uses a $59.50 bid and a $60.00 ask, where buying 200 shares and selling immediately costs $100. The spread is tiny on heavily traded ETFs and wider on thin ones.

Worked Example: $10,000 Over 30 Years

Take $10,000 invested once, growing at 7% a year before fees for 30 years. The only difference is the expense ratio, taken from the return each year, so the net return is 7% minus the fee:

Expense ratio	Net return a year	Value after 30 years	Total fees paid
0.03% (largest index ETFs)	6.97%	$75,485	$282
0.14% (average index ETF)	6.86%	$73,191	$1,290
0.40% (average equity mutual fund)	6.60%	$68,032	$3,517
0.50%	6.50%	$66,144	$4,319
0.64% (average active stock fund)	6.36%	$63,584	$5,392
1.00%	6.00%	$57,435	$7,906

The gap is startling for such small percentages. Moving from a 0.03% fund to a 1.00% fund costs $18,050 on a single $10,000 investment — you end with $57,435 instead of $75,485. Even the step from 0.03% to the 0.40% average equity mutual fund costs $7,452. The fee looks tiny in year one ($3 versus $100 on $10,000), but the drag compounds.

What $500 a Month Becomes

Most people invest a little every month. Take $500 a month for 30 years at 7% gross, compounded monthly, with the fee taken from the annual return. At a 0.03% expense ratio the balance reaches $581,504. At 0.50% it reaches $533,513. At 1.00% it reaches $487,256 — a gap of $94,248 against the cheapest fund, on $180,000 of total contributions. Pick the cheapest fund that owns what you want to own, then pick the wrapper that fits how you invest. Our guide to how dividend reinvestment works shows how reinvested payouts add to the same compounding.

Taxes: Where ETFs Have a Real Edge

In a taxable brokerage account, ETFs have a structural tax advantage. When mutual fund investors redeem shares, the fund often has to sell holdings for cash to pay them — and those sales can realize capital gains inside the fund, which are then distributed to the shareholders who stayed. You can owe tax on gains you never sold, in a year your own investment fell.

In 2025, roughly 72% of US equity mutual funds issued capital gains distributions, with average payouts of 7% to 10% of NAV. In 2024, roughly 40% of US mutual funds paid out capital gains, compared with roughly 5% of US ETFs. In 2022, when the S&P 500 fell more than 18%, about two-thirds of US equity mutual funds still distributed gains averaging about 7% of NAV.

ETFs avoid most of this through in-kind creation and redemption. When an authorized participant redeems ETF shares, the fund hands over a basket of securities instead of cash — no sale happens inside the fund, so no gain is realized for the shareholders who stay. Over the 10 years to 2024, taxes took 1.9% of returns a year from large-cap equity mutual funds, against 0.7% from equity ETFs (American Century / Morningstar).

Put it in dollars: if a mutual fund distributes 7% of NAV and you pay 15% tax on it, the bill is 1.05% of your balance — $525 on a $50,000 holding, in a single year. The advantage disappears inside a 401(k) or IRA, where the SEC notes there is no tax difference between an ETF and a mutual fund at all. Taxes argue for ETFs in a taxable account and are irrelevant inside a retirement account.

Index vs Active: What the Scoreboard Says

Because most expensive funds are actively managed, the fee question is really an active-versus-index question. S&P Dow Jones Indices has kept the scoreboard for 25 years in its SPIVA scorecards, counting funds that closed along the way.

The year-end 2025 scorecard is blunt: 78.8% of large-cap active funds trailed the S&P 500 in 2025 alone; over 10 years, 85.6% trailed; over 15 years, 89.9%; over 20 years, 92.9%. Across all US equity funds, 95.0% trailed their benchmark over 20 years. Only about 7 in 100 large-cap managers matched or beat the index over two decades.

That does not mean active funds never win. It means the odds are long, the winners are hard to identify in advance, and the fee is certain while the outperformance is not. A 0.03% index fund guarantees you the market's return minus almost nothing; a 0.64% active fund must beat the market by more than its fee every year just to break even. Most do not.

Minimums, Fractional Shares and Automatic Investing

Minimums are where mutual funds still put up a wall. Vanguard's Admiral Shares index funds — VFIAX and VTSAX — require a $3,000 minimum, and $50,000 for most actively managed Admiral funds. Target Retirement funds and the STAR fund start at $1,000.

An ETF has no minimum beyond the price of one share — and at many brokers, not even that. Fractional-share trading at brokers such as Fidelity and Schwab lets you invest any dollar amount, even $1. Vanguard's own brokerage did not support fractional ETF shares as of the last update, so check your broker first. If you are starting with $100, an ETF (or a $0-minimum mutual fund) is your only route into a broad index.

Mutual funds fight back on automation. At most fund companies you can set up an automatic plan — say $500 pulled from your bank on the 1st of every month — and every cent goes to work, because mutual funds trade in exact dollar amounts. ETFs historically needed whole-share purchases; fractional shares have closed most of that gap, but not everywhere. If hands-off monthly investing is your priority, a mutual fund's automatic plan is the smoother tool. Our guide to whether to invest or pay off debt first helps decide if that $500 belongs in a fund at all.

Which One Should You Buy?

There is no single winner — the right wrapper depends on your account, your starting amount and your habits.

Your situation	Buy this	Why
Taxable brokerage account, long-term holding	Low-cost index ETF	Fewest distributions; lowest fees; intraday control
401(k) or IRA	Whichever index fund is cheapest in the plan	No tax difference inside; fees are the only gap
Starting with under $3,000	ETF (fractional shares if offered)	No $3,000 minimum wall
Want fully automatic monthly investing	Index mutual fund	Exact-dollar auto-invest is built in
Want to trade with limit orders or during the day	ETF	Mutual funds cannot do either
Your 401(k) offers only mutual funds	The plan's cheapest index mutual fund	A 0.05% index fund beats an ETF you cannot buy

If you hold both wrappers, keep the same discipline in each: a broad index, the lowest fee you can find, and a regular contribution schedule. Do not buy an actively managed ETF and assume the wrapper fixes the fee — active ETFs exist, some charge 0.75% or more, and the SPIVA odds apply to them too. Our guide to how compound interest works shows the math of starting now versus later.

Common Mistakes With ETFs and Mutual Funds

Paying 1% for the same index. Two funds tracking the same S&P 500 can charge 0.03% and 1.00% — the expensive one owns the same stocks and keeps more of your return.

Buying a mutual fund just before its distribution date. Funds distribute gains once a year, often in December — buy the week before and you inherit a tax bill on gains earned before you arrived.

Trading ETFs like stocks. Frequent trading adds spreads and commissions and rarely helps.

Ignoring the premium or discount. On a thinly traded ETF, a 1% premium hands back a third of a year's fee advantage on day one.

Assuming your 401(k) has ETFs. Most plans offer mutual funds only, often including index funds at 0.05% or less — use the cheapest option in the plan.

Choosing active because the manager "beat the market last year." In 2025 about 21% of large-cap active funds did — but over 20 years, only about 7% did. One good year is not a strategy.

Frequently Asked Questions

Is an ETF better than a mutual fund?

For most long-term investors in a taxable account, yes — a low-cost index ETF is usually cheaper, more tax-efficient, and trades all day. But a low-cost index mutual fund is just as good inside a 401(k) or IRA, where there is no tax difference, and better for automatic investing. The fee matters far more than the wrapper.

Can I lose money in an ETF or a mutual fund?

Yes — in 2022 the S&P 500 fell more than 18%, and index funds tracking it fell with it. Neither wrapper protects you from market losses.

Do ETFs pay dividends?

Yes, when the stocks or bonds inside them pay income. The ETF collects it and passes it to you, usually quarterly, and you can reinvest it automatically through a dividend reinvestment plan (DRIP) at most brokers. Try the numbers in our Dividend DRIP Calculator.

What is the minimum to invest in an ETF?

There is no fund minimum beyond the price of one share, and many brokers now offer fractional shares, so you can start with as little as $1. By contrast, Vanguard Admiral Shares index mutual funds require $3,000 for a first purchase, and target-date funds $1,000.

Are mutual funds tax-efficient?

Less so than ETFs in a taxable account: in 2025 about 72% of US equity mutual funds paid capital gains distributions averaging 7% to 10% of NAV, while only about 6% of ETFs anticipated any. Inside a 401(k) or IRA there is no difference.

Should I buy an index fund or an actively managed fund?

The data favors the index fund: over the 20 years to December 2025, 92.9% of actively managed large-cap US funds trailed the S&P 500 (SPIVA). An active fund must beat the market by more than its fee every year just to match the index fund — and most do not.

Sources: US SEC, Investor.gov, "Characteristics of Mutual Funds and Exchange-Traded Funds (ETFs)" Investor Bulletin; Investment Company Institute, "Trends in the Expenses and Fees of Funds, 2025" (March 2026); Morningstar, "Few ETFs Project Capital Gains Distributions in 2025" and "Why ETFs Win the Tax Battle Over Mutual Funds"; American Century Investments, "Understanding ETF Tax Efficiency" (July 2026); S&P Dow Jones Indices, SPIVA U.S. Year-End 2025 Scorecard; Vanguard, "Vanguard mutual fund fees and minimums". Worked examples were computed in Python (net return = 7% gross minus the fee). Benchmarks are dated November 2026 — check the current expense ratio in the fund's prospectus before investing.

This article is general educational information, not financial advice. Investing involves risk, including possible loss of principal. Confirm the current terms in the prospectus and with a qualified adviser before you invest.