What an ETF is and how it works

An ETF (exchange-traded fund) is a basket of investments bundled together and sold as a single security on a stock exchange. When you buy one share of an ETF, you own a small piece of everything inside that basket — which might be stocks, bonds, commodities, or a mix of all three. The fund manager handles the buying and selling of those individual holdings, and you pay a fee for that service.

ETFs trade like stocks do. You can buy and sell them during market hours through a brokerage account, and the price changes throughout the day based on what other investors are willing to pay. This is different from mutual funds, which only trade once per day after the market closes. If you want to move money quickly, an ETF gives you that flexibility.

The holdings inside an ETF follow a set strategy. Some ETFs track a specific index — like the S&P 500, which holds 500 large U.S. companies — and straightforward own all those stocks in the same proportions. Others are actively managed, meaning a fund manager picks and chooses which investments to hold based on their judgment. The strategy is spelled out in the fund's prospectus, which you can read before you invest.

Key Takeaways

  • An ETF is a collection of investments packaged as a single security that trades on a stock exchange like a stock does.
  • You pay an annual fee (called an expense ratio) to own an ETF, which covers the cost of managing the fund and keeping it running.
  • ETFs can hold stocks, bonds, commodities, or combinations of these, depending on the fund's stated strategy.
  • Because ETFs trade throughout the day, you can buy and sell them whenever the market is open, unlike mutual funds.
  • Index-tracking ETFs tend to have lower fees than actively managed ones because they require less hands-on management.

How much it costs to own an ETF

The main cost is the expense ratio, which is an annual percentage fee taken from your investment. If an ETF has a 0.05% expense ratio and you own $10,000 worth, you pay $5 per year. That fee is deducted automatically — you do not write a check for it. Index-tracking ETFs typically charge between 0.03% and 0.20% per year, while actively managed ETFs often charge 0.50% to 1.50% or higher.

You may also pay a trading commission when you buy or sell shares, depending on your brokerage. Many brokerages now offer commission-free ETF trading, so check your account before you assume you will owe a fee. Some ETFs also distribute dividends or capital gains to shareholders, which may trigger a tax bill if you hold the fund in a regular taxable account.

The difference between index ETFs and actively managed ETFs

An index ETF holds the same stocks or bonds as a published index — a preset list that does not change often. The fund manager's job is straightforward to own those holdings in the right proportions and keep costs low. Because there is little decision-making involved, these funds charge lower fees. An S&P 500 index ETF, for example, owns all 500 companies in that index and rebalances only when the index itself changes.

An actively managed ETF has a fund manager who researches investments and decides what to buy and sell based on their strategy. The manager might focus on undervalued stocks, high-dividend companies, or emerging markets — whatever the fund's objective states. This hands-on approach costs more, which is why the expense ratio is higher. Whether the extra cost is worth it depends on whether the manager's picks outperform the market over time, which is hard to predict.

Why people invest in ETFs

ETFs offer when ready diversification. Instead of buying 50 individual stocks, you can buy one ETF that holds 50 stocks (or 500, or 5,000). That spreads your risk across many companies, so a single bad performer does not sink your whole investment. For someone starting out, this is much simpler than building a diversified portfolio from scratch.

ETFs also offer flexibility. You can own a broad market index, focus on a specific sector like technology or healthcare, bet on international stocks, or hold bonds instead of stocks — all in a single account. You can mix and match different ETFs to build a portfolio that matches your goals and comfort with risk. And because they trade like stocks, you can sell whenever you need the money, rather than waiting for a fund to process your request.

The low fees on index ETFs make them attractive for long-term investors. Over decades, even a small difference in annual costs adds up. A 0.05% expense ratio on an index ETF means more of your money stays invested and compounds over time, compared to a 1% fee on an actively managed fund.

How to buy an ETF

You need a brokerage account to buy ETFs. Open an account with a broker — online brokers like Fidelity, Schwab, or Vanguard are common choices — and link a bank account to fund it. Once your account is set up and has money in it, you can search for an ETF by its ticker symbol (a short code like SPY or VOO) and place an order to buy shares, just as you would buy a stock.

Decide how many shares you want to own. ETF prices vary widely — some trade for under $50 per share, others for over $300 — so the number of shares you can afford depends on the fund's price and how much money you have to invest. You can buy fractional shares at most brokerages now, so you do not have to own a whole number of shares if you do not want to.

Your order will execute during market hours (9:30 a.m. to 4 p.m. Eastern time on weekdays). You will own the shares when ready and can hold them as long as you want. The ETF will send you a statement showing your holdings, and you can track the value in your brokerage account anytime.

ETFs versus stocks and mutual funds

A stock is a share of ownership in a single company. When you buy a stock, you own a piece of that one business and its performance depends entirely on how well it does. An ETF holds many stocks (or other investments), so your return depends on the average performance of all those holdings. This makes ETFs less risky than individual stocks because you are not betting everything on one company.

A mutual fund is similar to an ETF — both are baskets of investments managed by a professional. The key difference is how they trade. Mutual funds only trade once per day after the market closes, at a price set by the fund company. ETFs trade throughout the day on an exchange, so you can buy and sell whenever you want and see the price change in real time. ETFs also tend to have lower fees and are more tax-efficient in taxable accounts.

Tax considerations for ETF investors

In a regular taxable brokerage account, you owe capital gains tax when you sell an ETF for more than you paid for it. If you hold the ETF for more than one year before selling, you pay the lower long-term capital gains rate. If you sell within a year, you pay your ordinary income tax rate, which is usually higher.

ETFs are generally more tax-efficient than mutual funds because of how they are structured. When other investors sell their shares, the fund does not have to sell its underlying holdings to pay them out, so it does not trigger taxable gains for remaining shareholders. This is one reason ETFs are popular in taxable accounts. In a tax-advantaged account like an IRA or 401(k), you do not owe tax on gains until you withdraw the money, so tax efficiency matters less.

Frequently Asked Questions

Can I lose money investing in an ETF?

Yes. If the value of the investments inside the ETF falls, the price of the ETF falls too, and you lose money. Diversification reduces the risk that any single bad investment will wipe you out, but it does not eliminate the risk that the overall market or a sector will decline. The longer you hold an ETF, the more time you have to recover from short-term drops.

Do I get dividends from an ETF?

Many ETFs do pay dividends if the stocks or bonds inside them pay dividends. The fund collects those payments and distributes them to shareholders, usually quarterly or annually. You can choose to reinvest the dividends back into the fund or take them as cash. Check the fund's fact sheet to see its dividend history.

What is the difference between an ETF and an index fund?

An index fund is a mutual fund or ETF that tracks a specific index. So all index funds are either mutual funds or ETFs, but not all ETFs are index funds — some are actively managed. The main difference is how they trade: index mutual funds trade once per day, while index ETFs trade throughout the day like stocks.

How much money do I need to start investing in ETFs?

There is no minimum investment required. You can buy a single share of an ETF with whatever money you have, and many brokerages now allow fractional shares, so you can invest even smaller amounts. Some brokerages have account minimums, but many have none.

Should I pick individual ETFs or use a robo-advisor?

A robo-advisor is a service that builds and manages a portfolio of ETFs for you based on your goals and risk tolerance. It is a good choice if you want hands-off investing and do not want to research funds yourself. If you enjoy learning and want full control, you can pick your own ETFs. Both approaches work — it depends on your preference and how much time you want to spend.