Index Funds vs ETFs: What’s the Difference and Which Should You Choose?

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Index funds and ETFs are the two most popular ways to invest for beginners. They are very similar. But they have a few key differences. This guide breaks down both in plain language.

What Is an Index Fund?

An index fund is a type of mutual fund that tracks a market index. The most common is the S&P 500. The S&P 500 is a list of the 500 biggest U.S. companies. An index fund that tracks it buys all 500 stocks in the same proportions. You get instant diversification.

Index funds are bought and sold at end-of-day prices. You place an order, and it fills at the closing price. You can only buy full shares, not fractional shares (with some exceptions).

What Is an ETF?

An ETF (exchange-traded fund) is similar to an index fund, but it trades on a stock exchange like a regular stock. You can buy and sell it at any time during the trading day, just like Apple or Amazon stock. You can buy fractional shares at many brokerages.

Most ETFs track an index too. The most popular is VOO (Vanguard S&P 500 ETF). It tracks the same 500 companies as an S&P 500 index fund.

Index Funds vs ETFs: Side-by-Side

Expense Ratios: The Hidden Cost

Both index funds and ETFs charge an expense ratio. This is an annual fee expressed as a percentage of your balance. A 0.03% expense ratio on $10,000 costs $3 per year. Always choose the lowest expense ratio you can find.

Fidelity offers zero-expense-ratio index funds like FZROX. Vanguard and Schwab offer funds and ETFs with expense ratios near zero.

Tax Efficiency

ETFs are generally more tax-efficient than index funds. This is because of how they handle investor redemptions. ETFs rarely trigger capital gains taxes within the fund itself. This matters more in taxable accounts. If you invest in a Roth IRA, tax efficiency inside the fund matters less.

Which Brokerages Offer the Best Index Funds and ETFs?

• Fidelity: Best for zero-fee index funds (FZROX, FZILX). Great for hands-off investors.
• Vanguard: Best for ETFs (VTI, VOO). Invented the index fund concept.
• Schwab: Great for both. Low-cost ETFs and solid index funds.

Which Should You Choose?

For most beginners, the answer is: it does not matter much. Pick either one at a low-cost brokerage and invest consistently. The most important factor is to start early and keep investing.

• If you want to auto-invest a fixed dollar amount every month, an index fund is easier.
• If you want more flexibility to trade during the day, an ETF is better.
• If you have less than $1,000 to start, an ETF with fractional shares may work better.

For more on how to get started, see our guide on how to start investing with $100. If retirement is your goal, learn how to open a Roth IRA and compare Roth vs Traditional IRA.