Index Funds vs ETFs: What Beginners Need to Know

By the Bigger Investing Team • Updated April 2026 • Affiliate Disclosure: We may earn a commission when you sign up through our links, at no extra cost to you.

If you’ve started looking into investing, you’ve probably run into two terms that sound almost identical: index funds and ETFs. Both track market indexes. Both cost almost nothing. Both are recommended by virtually every financial expert for beginners.

So what’s actually different — and does it matter which one you pick? We break it down below.

What Are Index Funds?

An index fund is a type of mutual fund designed to match the performance of a specific market index, such as the S&P 500 or the total U.S. stock market. Instead of paying a fund manager to pick individual stocks, an index fund simply holds every stock (or a representative sample) in its target index.

When you invest in an S&P 500 index fund, for example, your money is spread across all 500 of the largest publicly traded U.S. companies. You automatically own a tiny piece of Apple, Microsoft, Amazon, and hundreds of other businesses — without having to research or buy each one individually.

Index funds are bought and sold at the end of the trading day at a single price called the net asset value (NAV). You place your order, and the trade executes after the market closes.

What Are ETFs?

An exchange-traded fund (ETF) is a basket of investments that trades on a stock exchange — just like an individual stock. Many ETFs also track indexes, which is why “index fund vs ETF” can feel like comparing two things that do the same job.

The key difference is structural. ETFs trade throughout the day at fluctuating prices. You can buy an ETF at 10:15 a.m. and sell it at 2:30 p.m. if you wanted to. You can also place limit orders, which let you set the exact price you’re willing to pay.

Like index funds, ETFs offer broad diversification at low cost. Many of the most popular ETFs — like the Vanguard S&P 500 ETF (VOO) or the Schwab U.S. Broad Market ETF (SCHB) — track the exact same indexes as their mutual fund counterparts.

Index Funds vs ETFs: Key Differences

On the surface, index funds and ETFs look nearly identical. Both offer diversification, low fees, and passive management. But when you dig into the details, several differences matter — especially for beginners deciding where to put their money.

Trading and Pricing

Index funds trade once per day after market close. ETFs trade in real time throughout the day, just like stocks. For long-term investors using dollar-cost averaging, this difference barely matters. But if you want control over your exact purchase price, ETFs give you that flexibility.

Minimum Investment

This is where the gap used to be significant. Many index funds historically required minimums of $1,000 to $3,000 to get started. ETFs, on the other hand, only require enough money to buy a single share — and with fractional shares now available on most platforms, you can start with as little as $1.

That said, Fidelity and Schwab now offer index funds with $0 minimums, so this advantage has narrowed for investors using those brokerages.

Expense Ratios

Both index funds and ETFs are known for low fees, but ETFs often have a slight edge. For example, the Vanguard S&P 500 index fund (VFIAX) charges 0.04% while the ETF version (VOO) charges 0.03%. The difference is negligible on small portfolios — on a $10,000 investment, that’s $4 vs. $3 per year.

The real takeaway: both are dramatically cheaper than actively managed funds, which charge 0.50% to 1.00% or more.

Tax Efficiency

ETFs have a structural advantage when it comes to taxes. Because of how ETF shares are created and redeemed (through a mechanism called “in-kind” transactions), they typically generate fewer taxable capital gains distributions than mutual funds — even index mutual funds.

If you’re investing in a taxable brokerage account, ETFs may save you money at tax time. In a tax-advantaged account like a Roth IRA or 401(k), this difference doesn’t apply since your gains aren’t taxed anyway.

Automatic Investing

Index funds shine here. Most brokerages let you set up automatic recurring purchases — say, $200 on the 1st and 15th of every month — directly into an index fund. This is true set-it-and-forget-it dollar-cost averaging.

ETFs have historically been harder to automate. However, platforms like M1 Finance, Schwab, and Fidelity now support automatic ETF purchases. If your brokerage doesn’t, you’ll need to manually place each trade.

Side-by-Side Comparison

Which One Should You Choose?

For most beginners, the honest answer is: it doesn’t matter much. Picking either a low-cost index fund or a low-cost ETF that tracks a broad market index puts you ahead of the vast majority of investors who pay high fees for actively managed funds.

That said, here’s a simple framework:

Choose an Index Fund If:

You want to automate your investing completely. You’re comfortable investing a set dollar amount on a schedule and never thinking about it. You already have an account with Vanguard, Fidelity, or Schwab and want to keep things simple.

Choose an ETF If:

You’re investing in a taxable brokerage account and want better tax efficiency. You want the flexibility to buy and sell during market hours. Your brokerage makes it easier or cheaper to buy ETFs. You’re starting with a small amount and want to invest in fractional shares.

Or Do Both

There’s no rule against holding both. Many investors use index funds in their 401(k) or IRA (where tax efficiency doesn’t matter) and ETFs in their taxable brokerage account (where it does). This hybrid approach captures the best of both worlds.

Best Platforms for Buying Index Funds and ETFs

Where you buy matters almost as much as what you buy. Here are three beginner-friendly platforms that support both index funds and ETFs with zero commissions:

Fidelity

Zero-fee index funds plus commission-free ETFs in one place.

Offers its own zero-fee index funds (yes, 0.00% expense ratio) plus commission-free ETF trading. The mobile app is clean and the research tools are excellent. A strong pick if you want both index funds and ETFs in one account.

Schwab

Beginner-friendly with top-rated customer service.

Another full-service option with $0 minimum index funds and commission-free ETF trades. Schwab’s platform is beginner-friendly and their customer service is consistently rated among the best in the industry.

M1 Finance

The best platform for automating ETF-based dollar-cost averaging.

A unique approach that lets you build a “pie” portfolio of ETFs and stocks, then automates your contributions across all holdings. It’s the best platform for automating ETF-based dollar-cost averaging at no cost.

Frequently Asked Questions

Are index funds and ETFs the same thing?

Not exactly. Both can track the same index and hold the same stocks, but they differ in how they’re traded, priced, and taxed. An ETF trades like a stock throughout the day, while an index fund (mutual fund) trades once at end of day. Many ETFs are index funds, but not all index funds are ETFs.

Which has lower fees, index funds or ETFs?

They’re very close. ETFs sometimes have a slight edge — a few hundredths of a percent. On a typical beginner portfolio, the fee difference between an index fund and its ETF equivalent amounts to a few dollars per year. Focus on picking low-cost options in either category rather than splitting hairs between the two.

Can I hold both index funds and ETFs in the same account?

Yes. There’s no restriction on mixing them. Many investors hold index funds for automated contributions and ETFs for additional investments they want to time or manage differently.

Should I switch my index funds to ETFs?

Usually not worth it unless you’re paying high expense ratios or you need better tax efficiency in a taxable account. Selling index fund shares to buy ETFs triggers a taxable event, which can erase any tax advantage you’d gain from switching. If you’re happy with your current index funds, keep contributing to them.

How many index funds or ETFs do I need?

You can build a perfectly diversified portfolio with as few as one to three funds. A total stock market fund gives you broad U.S. exposure. Add an international fund and a bond fund if you want more diversification. Owning dozens of overlapping funds actually makes your portfolio harder to manage with no real benefit.

Affiliate Disclosure & Editorial Note: Bigger Investing may earn a commission when you sign up through links on this page, at no additional cost to you. Our editorial team evaluates products independently. Commissions do not influence our rankings or recommendations.

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Disclaimer: This article is for informational purposes only and does not constitute financial advice. Always do your own research or consult a qualified financial advisor before making investment decisions.

Maurice Agudelo

Meet Maurice, a staff editor at Bigger Investing. He’s an accomplished entrepreneur who owns multiple successful websites and a thriving merch shop. When he’s not busy with work, Maurice indulges in his passion for kayaking, climbing, and his family. As a savvy investor, Maurice loves putting his money to work and seeking out new opportunities. With his expertise and passion for finance, he’s dedicated to helping readers achieve their financial goals through Bigger Investing.