Understand the key differences in structure, fees, tax efficiency, and how to choose the right investment vehicle for your portfolio.
While both Exchange-Traded Funds (ETFs) and mutual funds pool money from many investors to buy a diversified portfolio of assets, they are structured differently.
ETFs are structured like individual stocks. They trade on major stock exchanges, and their prices fluctuate throughout the trading day. They utilize a unique "creation and redemption" process driven by Authorized Participants to keep their price in line with their Net Asset Value (NAV).
Mutual funds are priced only once per day, after the market closes. When you buy or sell a mutual fund, you are transacting directly with the fund company at that day's closing NAV.
ETFs are generally more tax-efficient than mutual funds. Because of the "in-kind" creation and redemption process, ETFs can avoid realizing capital gains when managing the portfolio. With a mutual fund, if the manager sells securities for a profit to meet redemption requests, those capital gains are distributed to all shareholders, creating a tax liability even if you didn't sell your shares.
Expense ratios cover the operating costs of the fund. Generally, index-tracking ETFs have lower expense ratios than actively managed mutual funds. However, when comparing an index ETF to an index mutual fund tracking the same benchmark (like the S&P 500), the fees are often similarly low. Be aware that some mutual funds carry sales loads (commissions) and 12b-1 fees, which are extremely rare in ETFs.
Because ETFs trade like stocks, you can buy or sell them intraday, place limit orders, stop-loss orders, and even buy them on margin or short sell them. Mutual funds are only executed at the end-of-day NAV, meaning you don't know the exact price you are buying or selling at until the market closes.
Historically, mutual funds often required a minimum initial investment (e.g., $1,000 or $3,000). To buy an ETF, you only needed enough money to purchase a single share (plus any commissions). Today, this gap has closed significantly, as many mutual funds have dropped their minimums to zero, and many brokerages offer fractional shares for ETFs.
Mutual funds have traditionally been the standard for automatic investing. You can easily set up a recurring transfer to buy exact dollar amounts of a mutual fund every month. Dividend reinvestment is also seamless. While ETFs historically required buying full shares, the rise of fractional ETF investing has made automatic investing and dividend reinvestment (DRIP) easily accessible for ETFs at most major brokerages.
The vast majority of ETFs are passively managed index funds, designed to track a benchmark. Most mutual funds are actively managed, attempting to beat the market. However, actively managed ETFs are growing in popularity, and index mutual funds have existed for decades. The choice is less about ETF vs Mutual Fund and more about Active vs Passive.
A few specific fund families (most notably Vanguard, thanks to a unique patented structure) allow investors to convert certain index mutual fund shares into their corresponding ETF shares without triggering a taxable event. If you hold a mutual fund in a taxable account and want the tax efficiency of the ETF version, check with your brokerage to see if a tax-free conversion is possible.
While specific recommendations depend on your goals, here are examples of popular funds that track the total US stock market: