ETF vs. mutual fund: What's the difference?

The main difference between an ETF and a mutual fund is how they trade. An ETF (exchange-traded fund) is bought and sold on a stock exchange throughout the day, just like a stock. A mutual fund is bought and sold only once per day, after the market closes, at a price set at that time. Both are baskets of investments like stocks or bonds, but this one timing difference drives most of the other contrasts between them.

This is educational information, not advice. All investing carries risk, including the possible loss of the money you put in.

What an ETF is

An ETF holds a collection of assets, such as stocks, bonds, or commodities, and trades on an exchange under a ticker symbol. When you buy one share of an ETF, you get a tiny slice of everything the fund holds. Most ETFs are passively managed, meaning they track an index like the S&P 500 rather than trying to beat it. Because there is no team of analysts picking stocks, the fees, called the expense ratio, tend to be low.

You can place an order to buy or sell an ETF at any moment the market is open. The price changes second by second based on supply and demand. You can also buy a single share, and many brokers allow fractional shares, so the starting amount can be very small. For more on how index-based funds work, see our guide to what an index fund is.

What a mutual fund is

A mutual fund also pools money from many investors to buy a portfolio of securities. A professional manager runs the fund, deciding what to buy and sell. Many mutual funds are actively managed, which means the manager tries to outperform a benchmark index. That active work costs money, so mutual fund expense ratios are often higher than ETF fees.

Mutual fund orders are processed only once a day. You submit your request during the day, and it executes at the net asset value (NAV), the fund's closing price calculated after markets close. Many mutual funds also require a minimum initial investment, often $1,000 to $3,000, which can be a barrier for a new investor.

Side-by-side comparison

Worked example: Maya builds a $500 position

Maya has $500 to start investing. She compares a popular S&P 500 ETF with an actively managed mutual fund that also tracks large U.S. companies.

The ETF trades at $250 per share, so she buys two shares for $500. Her broker charges no commission. The ETF has an expense ratio of 0.03%, so her annual fee is $500 × 0.0003 = $0.15 per year.

The mutual fund requires a $1,000 minimum, so Maya cannot buy it with only $500. If she had $1,000, the fund's expense ratio is 0.85%, meaning she would pay $1,000 × 0.0085 = $8.50 per year. Over ten years, assuming the fund value stays flat just for this math, the ETF costs her about $1.50 total, while the mutual fund costs about $85.

This example shows two practical differences: the mutual fund's minimum blocks Maya today, and the higher fee reduces returns over time. The SEC's investor education page explains how fees eat into returns.

What people get wrong about ETFs and mutual funds

Mistake 1: Assuming all mutual funds are actively managed. Many index mutual funds exist and simply track a benchmark. They usually have lower fees than active funds, though often still higher than comparable ETFs.

Mistake 2: Thinking ETFs are always cheaper. Some specialty ETFs have high expense ratios, and if you trade frequently, commissions can add up. Compare the total cost, not just the product type.

Mistake 3: Confusing intraday trading with better performance. Being able to trade all day does not mean an ETF earns more. It just gives you more flexibility and can create more chances to make impulsive decisions.

Mistake 4: Ignoring capital gains distributions. When an actively managed mutual fund sells holdings at a profit, it may pass those gains to you as a taxable distribution, even if you did not sell your shares. ETFs generally trigger fewer of these events because of how they are structured.

How taxes and retirement accounts change the picture

Taxes matter differently depending on where you hold the fund. Inside a 401(k) or IRA, you do not pay capital gains tax each year, so the tax-efficiency gap between ETFs and mutual funds shrinks. The IRS sets annual contribution limits for these accounts, such as about $24,500 for 401(k)s in 2026 and about $7,500 for IRAs in 2026.

In a regular taxable brokerage account, the difference matters more. If you sell an ETF or mutual fund for more than you paid, you owe capital gains tax on the profit. But with a mutual fund, you can owe tax on gains the manager realizes even if you hold your shares. The SEC regulates both products and requires funds to disclose their after-tax returns.

Putting it together

ETFs and mutual funds both let you own a diversified basket of investments without picking individual stocks. The choice often comes down to trading style, minimums, and fees. ETFs offer intraday trading and low entry costs, while mutual funds offer professional management and automatic investing features like dollar-cost averaging. Neither is universally better; your situation determines which fits.

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