ETF vs. Mutual Fund: Key Differences, Costs and Which Is Right for You

Exchange-traded funds and mutual funds are the two most popular ways Americans invest in the stock market. Both pool money from many investors to buy a diversified portfolio of stocks, bonds or other assets. Both can be actively managed or track an index. And both can be excellent building blocks for a long-term portfolio.

But they're not identical. Differences in how they trade, how they're taxed, what they cost and how you buy them can make one a better fit than the other depending on your situation. In this guide we compare ETFs and mutual funds side by side, explain the trade-offs, and help you decide which to use — and when to use both.

What Is a Mutual Fund?

A mutual fund pools money from investors and invests it according to a stated objective. Mutual funds have existed in the US for about a century and remain the backbone of most workplace retirement plans.

Key features:

• Priced once a day. All buy and sell orders execute at the fund's net asset value (NAV), calculated after the market closes at 4 p.m. Eastern.
• Bought from the fund company or broker, not on an exchange.
• May have minimum investments, often from $0 to a few thousand dollars.
• Can be active or passive. Index mutual funds track benchmarks; active funds try to beat them.
• May have sales loads or 12b-1 fees in some share classes.

What Is an ETF?

An exchange-traded fund also holds a diversified portfolio, but its shares trade on a stock exchange throughout the day like individual stocks. ETFs became widely available in the 1990s and have grown rapidly since. Our ETFs for beginners guide covers the basics.

Key features:

• Trade intraday at market prices that fluctuate during the trading day.
• Bought through any brokerage account, typically commission-free.
• No minimum beyond the price of one share, or less with fractional shares.
• Mostly index-based, although actively managed ETFs are growing.
• Generally more tax-efficient because of their unique creation and redemption process.

ETF vs. Mutual Fund: Side-by-Side Comparison

1. Trading and pricing Mutual funds trade once per day at NAV, so you don't know the exact price when you place your order. ETFs trade continuously, letting you see the price and use order types such as limit orders. For long-term investors, intraday trading isn't usually important — and it can even encourage unhelpful trading.

2. Costs Both structures can be very cheap. Broad index ETFs and index mutual funds from major providers often have expense ratios under 0.10%. However:

• Some mutual fund share classes charge sales loads (commissions of up to several percent) and 12b-1 marketing fees.
• ETFs have a bid-ask spread — a small trading cost each time you buy or sell — which is negligible for large, liquid funds.
• Actively managed funds of either type generally cost more than index funds.

FINRA's Fund Analyzer is a free tool to compare the true costs of specific funds.

3. Tax efficiency This is one of the biggest differences for investors in taxable accounts. When mutual fund shareholders redeem, the fund may need to sell securities to raise cash, potentially realizing capital gains that are distributed to all remaining shareholders — even those who didn't sell.

ETFs largely avoid this through in-kind redemptions: authorized participants exchange ETF shares for the underlying securities rather than cash, allowing the fund to shed low-cost-basis shares without triggering taxable gains. As a result, many stock ETFs distribute little or no capital gains year after year.

In tax-advantaged accounts such as IRAs and 401(k)s, this difference doesn't matter, because gains aren't taxed annually. Our guide to how dividends are taxed covers related tax issues.

4. Minimum investments Some mutual funds require an initial investment of $1,000 or more, although many have reduced or eliminated minimums. ETFs require only the price of one share, and fractional shares make it possible to invest almost any amount.

5. Automatic investing Mutual funds have traditionally made it easy to invest exact dollar amounts automatically — say $250 every month — which is ideal for dollar-cost averaging. Many brokers now offer automatic investing and fractional shares for ETFs too, narrowing this gap.

6. Transparency Most ETFs disclose their full holdings daily. Mutual funds typically disclose holdings quarterly or monthly, often with a delay.

7. Availability in retirement plans Most 401(k) plans offer mutual funds rather than ETFs, partly because mutual funds fit easily into payroll-based contribution systems. Inside your workplace plan, you'll likely use mutual funds or collective investment trusts.

Active vs. Passive: The Bigger Decision

The structure matters less than what the fund does. Whether you pick an ETF or mutual fund, the decision between index (passive) and active management has a bigger impact on long-term results. Decades of data show most active stock funds underperform their index benchmarks over long periods after fees. Our index fund investing guide explains why.

When a Mutual Fund May Be the Better Choice

• Your 401(k) only offers mutual funds. Choose the lowest-cost, broadly diversified options available.
• You want to invest exact dollar amounts automatically and your broker doesn't support fractional ETF investing.
• You prefer not to see intraday prices, which can reduce the temptation to trade.
• You want a specific actively managed strategy only available in mutual fund form.
• You hold a target-date fund as an all-in-one retirement solution.

When an ETF May Be the Better Choice

• You invest in a taxable brokerage account and want to minimize capital gains distributions.
• You want no minimum investment.
• You want flexibility to move between brokers easily — ETFs can be transferred to any brokerage, while some proprietary mutual funds can't.
• You want precise exposure to specific sectors, styles or themes. See our sector ETFs guide.
• You value daily transparency into holdings.

Can You Use Both?

Absolutely, and many investors do. A common setup:

• 401(k): Low-cost index mutual funds or a target-date fund.
• IRA: Either ETFs or index mutual funds — tax efficiency matters less here.
• Taxable account: ETFs for tax efficiency.

The goal is a coherent overall asset allocation across all accounts. Our diversified portfolio guide shows how to think about your accounts as one portfolio.

Watch Out for These Costs and Traps

• Front-end and back-end loads on certain mutual fund share classes. Low-cost, no-load funds are widely available.
• High expense ratios on actively managed funds.
• Wide bid-ask spreads on thinly traded ETFs.
• Leveraged and inverse ETFs, which are designed for short-term trading.
• Overlapping holdings when owning multiple funds that track similar indexes.

For unbiased education on fund fees and share classes, the SEC's Investor.gov is an excellent resource.

Key Takeaways

• Mutual funds trade once per day at NAV; ETFs trade throughout the day like stocks.
• Both can be very low-cost; watch for sales loads, 12b-1 fees and bid-ask spreads.
• ETFs are generally more tax-efficient in taxable accounts.
• Mutual funds dominate 401(k) plans and make automatic investing simple.
• Choosing index versus active management matters more than choosing ETF versus mutual fund.