ETF vs Mutual Fund: What Is the Difference?

Start with the overlap, because it is bigger than most comparison tables suggest. The SEC staff's investor bulletin on mutual funds and ETFs lists the shared features: both register with the SEC and publish a prospectus, both pool money from many investors into one portfolio, both are typically managed by SEC-registered investment advisers, and both can follow a passive index strategy or an active one. Both also charge fees and expenses regardless of how the fund performs.

Neither one is insured. Investor.gov's ETF page and mutual fund page both state that these funds are not guaranteed or insured by the FDIC or any other government agency, and that you can lose some or all of the money you invest.

Diversification is shared too, with a limit. The bulletin notes that some funds are less diverse than others, and that some ETFs track the performance of a single stock. You also cannot always tell the fund type from its name: some ETFs leave “ETF” out, and some exchange-traded products that are not registered funds use it. The bulletin points to the investment strategy section of the prospectus, which you can get free from the SEC's EDGAR database or from the fund.

This is the difference you notice first. With a mutual fund, you buy shares from the fund itself or through an intermediary such as a broker, and you sell by redeeming them back to the fund. With an ETF, the bulletin explains, retail investors can only buy and sell shares in market transactions on a stock exchange, so you need a brokerage account to hold them.

The price works differently as well:

• Mutual fund: you can place an order at any point in the business day, but you pay or receive the net asset value (NAV) per share calculated at the end of that day, plus or minus any fees. You do not know the exact price when you submit the order.
• ETF: you trade at the market price, which changes during the trading day. The bulletin notes that this price generally stays close to the end-of-day NAV but can be higher or lower, known as a premium or a discount, and may vary significantly.

FINRA's guide to exchange-traded funds adds the bid-ask spread: the gap between the highest price a buyer will pay and the lowest price a seller will accept. It can be almost zero for some products and much wider for others, and FINRA notes that an ETF with low trading volume can have wide spreads or trade at a large premium or discount. FINRA suggests comparing the market price with published estimates of the fund's value and considering order types other than market orders.

Both fund types charge management fees and other expenses indirectly, by deducting them from fund assets. The expense ratio is the yearly version of that cost: FINRA's mutual fund guide describes it as the percentage of the fund's total assets that goes toward recurring fees each year, listed in the prospectus and on the fund's website. Investor.gov warns that even small differences in fees can mean large differences in returns over time.

The fees around the expense ratio are where the two types split:

• Mutual funds can charge you directly for buying, selling, or exchanging shares, and some charge periodic account fees. FINRA explains sales charges called loads, and share classes of the same fund that carry different costs. No-load funds skip sales charges but may still have other fees.
• ETFs generally do not charge you directly for buying or selling shares, the SEC bulletin says, but you may pay a broker commission on each trade. FINRA notes that ETFs have expense ratios but no loads or 12b-1 fees, and the bid-ask spread from the section above still applies.

FINRA's free Fund Analyzer, described on the same mutual fund page, compares the costs of up to three funds or share classes for the amount and holding period you enter.

Both fund types pass income and gains through to you. Investor.gov explains that a fund pays shareholders nearly all the income from its portfolio, less expenses, as dividends, and distributes its capital gains, minus capital losses, at the end of the year. In a taxable brokerage account, the SEC bulletin says you may have to pay taxes on capital gains distributions with either type.

The difference is frequency. The bulletin notes that many ETFs buy and sell portfolio securities through in-kind exchanges rather than for cash, so they typically have fewer capital gains distributions, and thus lower taxes, than mutual funds. Inside a tax-advantaged account such as a 401(k) or IRA, it says there is no tax difference between the two. How this applies to you depends on your own tax situation, which this guide does not cover.

Reinvesting is one more practical gap. Investor.gov notes that mutual funds usually let you choose between receiving distributions and reinvesting them in more shares, while reinvesting ETF distributions can be more complicated and may involve additional brokerage commissions.

This is a hypothetical illustration. The funds and numbers are invented to show what to compare, not taken from any real fund.

Two funds from the same provider track the same index of large U.S. companies. One is a mutual fund with an expense ratio of 0.10%. The other is an ETF with an expense ratio of 0.05%.

1. Holdings: both aim to track the same index, so they invest in the same set of companies. The fund type does not change what you own.
2. Price: a mutual fund order placed at 11 a.m. fills at that day's end-of-day NAV. An ETF order fills at the market price when it executes, and the spread is part of that price.
3. Yearly fund expenses: on a hypothetical $10,000 balance, 0.10% is $10 a year and 0.05% is $5 a year. Then add what the expense ratio leaves out: any load or account fee on the mutual fund, and any commission and spread on each ETF trade.
4. Account: the ETF needs a brokerage account. The mutual fund can be held directly with the fund or through a broker.

None of this says which one to buy. It shows which questions decide the comparison for your account: where you already hold money, how often you plan to add to it, and what the full cost is at your size.

The ETF versus mutual fund question comes after a more basic one: what the fund owns. FINRA points to two traps. Some ETFs with different labels, such as sustainable or actively managed funds, can hold stocks very similar to those in popular indexes, which can overlap with what you already own. And leveraged or inverse products are designed to deliver a multiple or the opposite of an index's return over a set period, often one day or one month, and are generally not designed to be held longer than that.

Open the prospectus and the latest holdings list, write down the ten largest positions, and note what share of the fund they make up. In a stock fund, those positions are companies. Search companies and tickers in Benson to read the business summary, bull and bear cases, and risk context for the largest ones, then use the diversification guide to check whether the fund repeats bets you already hold. If you are still deciding between a fund and individual stocks, the first-investment guide covers that choice, and the minimums guide covers how little each one lets you start with.