Index Funds vs ETFs: What Beginners Should Know
Index funds and exchange-traded funds (ETFs) are two of the most popular ways for beginners to invest. Both let you own hundreds or thousands of companies in one purchase, often at very low cost. But they work slightly differently, and the right choice depends on how you like to invest.
Quick answer: An index fund is a fund that tracks a market index and is usually bought and sold once a day at a set price. An ETF is a fund that trades on a stock exchange throughout the day like a share. Many ETFs also track indexes. For long-term investors, the most important things are low fees, broad diversification and sticking with it, whichever wrapper you choose.
1. What is an index fund?
An index fund aims to match the performance of a market index, such as the S&P 500, FTSE All-Share or S&P/ASX 200, by holding the same companies. Because it does not pay managers to pick shares, costs are usually low. Index funds are often structured as mutual funds (in the UK, OEICs or unit trusts) and are priced once per trading day.
2. What is an ETF?
An ETF is a basket of investments listed on a stock exchange. You buy and sell it through a broker at the market price at any time the exchange is open. Most popular ETFs are index trackers, but some are actively managed or focus on narrow themes.
3. Key differences
| Index mutual fund | ETF | |
|---|---|---|
| How you trade | Once a day at the closing price | Any time during market hours |
| Where you buy | Fund provider or platform | Any brokerage account |
| Minimum investment | Some funds have minimums | The price of one share (or less with fractional shares) |
| Automatic monthly investing | Usually easy | Depends on the broker |
| Costs | Ongoing fee; often low | Ongoing fee plus possible trading costs and bid-ask spread |
4. Costs: the number that matters most
Every fund charges an annual fee, called the expense ratio in the US, ongoing charges figure (OCF) in the UK and management expense ratio (MER) in Canada. A difference of 1% a year can add up to tens of thousands over decades. Broad index funds and ETFs often charge a small fraction of a percent; actively managed funds usually charge more. Also check platform or account fees.
5. Which should you choose?
- Choose an index mutual fund if you want to invest a fixed amount automatically each month and never think about trading.
- Choose an ETF if your broker charges no commission, you want lower minimums, or the ETF has a lower fee than comparable funds.
- In the US, ETFs are often more tax-efficient in ordinary taxable accounts. In tax-advantaged accounts such as IRAs, ISAs, TFSAs and super, this matters less.
6. What to look for in any fund
- What index does it track, and is it broadly diversified?
- What is the annual fee?
- How closely does it follow its index (tracking difference)?
- Is the provider large and regulated?
- Does it pay out dividends or reinvest them (accumulating vs distributing)?
7. Common beginner mistakes
- Trading ETFs too often, which adds costs and usually lowers returns
- Buying narrow “theme” ETFs because they performed well recently
- Owning several funds that hold the same companies
- Selling in a panic during a market fall
New to investing? Start with our guide to how the stock market works. And before investing, make sure your family is protected; see term vs whole life insurance.
Frequently asked questions
Are ETFs riskier than index funds?
Not inherently. An ETF and an index fund tracking the same index carry the same market risk.
Can I lose money in an index fund?
Yes. If the market falls, the fund falls too. Index funds reduce the risk of any single company failing, not market risk.
How many funds do I need?
One or two broad, global funds can be enough for many beginners.
Are index funds good for long-term investing?
Low-cost, diversified index funds are widely recommended for long-term investors because of their low fees and broad exposure.