ETFs vs. mutual funds: what is actually different

An ETF (exchange-traded fund) and a mutual fund both let you buy hundreds or thousands of stocks or bonds in a single product. So what is the difference?

How you trade them

Mutual funds trade once a day, after the market closes, at a single end-of-day price. You enter your order during the day and find out the price later.

ETFs trade like a stock, all day long, at whatever price the market is offering at that moment. You can buy or sell instantly during market hours.

Cost

ETFs are usually cheaper. The expense ratio (the yearly fee, expressed as a percent) on a low-cost index ETF can be 0.03% to 0.10%. Mutual funds vary more. Index mutual funds are also cheap, but actively managed mutual funds often charge 0.50% to 1.50% or more.

On a $100,000 portfolio over 30 years, a 1% difference in fees can cost you tens of thousands of dollars in lost growth. Fees are not glamorous, but they matter enormously.

Taxes (in regular brokerage accounts)

ETFs are usually more tax-efficient. Mutual funds sometimes pass along surprise capital-gains tax bills to their holders, even if you did nothing all year. ETFs almost never do this.

This only matters in a regular taxable brokerage account. Inside a 401(k) or IRA, taxes are deferred anyway, so this becomes irrelevant.

When to use which

• Most beginners are better off with low-cost index ETFs. They are flexible, cheap, and tax-friendly.
• Mutual funds still make sense in retirement accounts, especially if your 401(k) plan offers strong index mutual funds with no fees.
• Avoid expensive actively managed funds unless there is a clear reason. The long-run odds of beating an index fund are not in your favor.

What this lesson is NOT

This compares the two wrappers on trading, cost, and taxes. It does not pick a specific fund for you, and it says nothing about what to hold inside either one.