Most people spend way too long on this question. I know I did. ETFs and mutual funds are more similar than the internet makes them sound, and for most college students just starting out, the difference is almost academic. Almost. There are a few things worth understanding before you pick one and move on with your life.
I’m not a financial advisor, just a finance student sharing what I’ve actually done and learned. Do your own research before making any financial decisions.
| Feature | ETF | Mutual Fund |
|---|---|---|
| Trades like | A stock, any time during market hours | End of day only, at NAV price |
| Minimum investment | Price of one share (often $1 with fractional shares) | Often $0 to $3,000 depending on the fund |
| Tax efficiency | Generally higher | Generally lower |
| Best for | Flexible, low-cost investing in a brokerage account | Automatic investing, retirement accounts |
| Expense ratio example | FSKAX: 0.015% | Vanguard VTSAX: 0.04% |
| Automatic investing | Harder to set up | Usually built in |
What You’re Actually Choosing Between
Both ETFs and mutual funds are pooled investment vehicles. You put money in, it buys a basket of underlying securities, and you own a slice of the whole thing. Neither one is inherently riskier than the other. What makes them different is mostly how they trade, what they cost, and how well they fit into an automated investing setup.
ETFs
An ETF trades on an exchange exactly like a stock. If the market is open, you can buy or sell shares of VOO (Vanguard’s S&P 500 ETF, expense ratio 0.03%) at whatever the current price is. That flexibility sounds great and sometimes it is, but for a 20-year-old trying to build long-term wealth, intraday trading access is not really a feature you need. It’s just there.
The real advantage of ETFs is cost and tax efficiency. Because of how ETF shares are created and redeemed through what’s called an in-kind mechanism, they rarely generate the capital gains distributions that mutual funds do. In a taxable brokerage account, that matters a lot. You’re not getting hit with a tax bill because other investors in the fund decided to sell.
Fidelity, Schwab, and Vanguard all offer ETFs with no trading commissions and expense ratios that are basically rounding errors. Fidelity’s FTEC, a technology sector ETF, runs 0.084%. Their total market ETF FZROX is literally 0.00%. These are not big numbers to optimize around, but they compound over decades, so it’s still worth paying attention.
Mutual Funds
A mutual fund doesn’t trade during the day. You put in a buy order and it executes at the end of the trading session at the fund’s net asset value. For a long-term investor who isn’t trying to time the market anyway, that’s not a limitation. That’s just how it works.
Where mutual funds win is automation. Setting up automatic contributions is straightforward in a way that ETF investing sometimes isn’t. With FSKAX, Fidelity’s total market index fund with an expense ratio of 0.015% and no investment minimum, I can tell Fidelity to pull $200 on the first of every month and it just happens. I treated my Roth IRA contribution like a fixed bill the first month of my internship. Moved $500 over before I touched anything else. Whatever was left was mine to spend. That kind of set-it-and-forget-it behavior is easier to build with mutual funds.
The tax efficiency issue is real though. Mutual funds can pass capital gains distributions to shareholders even if you personally didn’t sell anything. Inside a Roth IRA or a 401(k) it doesn’t matter because you’re not paying taxes on gains anyway. In a taxable account, it’s an actual cost you should think about.
How to Actually Decide
The honest answer is that your account type should drive this decision more than anything else.
If you’re investing inside a Roth IRA or a traditional IRA, the tax efficiency gap between ETFs and mutual funds basically disappears. Both grow tax-free or tax-deferred. So the only questions left are cost and convenience. FSKAX and VTI (Vanguard’s total market ETF at 0.03%) are both excellent choices and the difference in returns over your lifetime from picking one over the other is going to be negligible. I use FSKAX in my Fidelity Roth IRA because I opened the account there, the fund has no minimum, and the automatic investing setup took about four minutes to configure. I could be wrong that it’s the optimal choice. I’m pretty confident it’s a fine one.
If you’re investing in a taxable brokerage account, lean toward ETFs. The capital gains distribution issue with mutual funds is real in a taxable setting and it creates tax drag that compounds over time. VTI, VOO, or Fidelity’s FZROX are all solid starting points depending on which brokerage you use. If you’re still figuring out which platform makes sense for you, this breakdown of the best investing apps for college students is worth a read before you open anything.
If you’re new to brokerage accounts generally and the whole concept still feels a little foggy, this piece on what a brokerage account actually is will fill in the gaps faster than anything else I’ve found.
One more thing: fractional shares have changed the ETF accessibility question significantly. Fidelity lets you buy fractional shares of ETFs, so if VOO is trading at $540 and you only have $50 to invest, that’s not a barrier anymore. Schwab does the same. This used to be a genuine advantage of mutual funds since you could always invest an exact dollar amount. Now it mostly isn’t.
What I Actually Use and Why
I keep it simple. My Roth IRA at Fidelity is almost entirely FSKAX. Total US market, 0.015% expense ratio, no minimum, automatic monthly contributions. I opened it at 19 with $400 from my first real paycheck and the whole setup was completely anticlimactic. That was sort of the point.
I don’t have a taxable brokerage account yet because my income is still at a level where maxing the Roth IRA ($7,000 for 2025) makes more sense than putting after-tax money into a taxable account. When that changes, I’ll probably use ETFs there specifically because of the tax efficiency angle. Probably VTI or FZROX depending on where I’m holding the account at that point. For a deeper look at how Fidelity and Vanguard compare as platforms, especially for a beginner, this comparison is genuinely useful.
The bigger risk for most people starting out isn’t picking the wrong fund type. It’s not investing at all because they’re waiting to feel more certain. FSKAX and VTI are both fine. Pick one, automate it, and check it about as often as you check your bank statement.
Frequently Asked Questions
Q: Can I hold both ETFs and mutual funds in the same account? Yes, most brokerages let you hold both in the same account without any issues. There’s no rule that says you have to pick one.
Q: Are ETFs riskier than mutual funds? Not inherently. Risk comes from what the fund holds, not whether it’s structured as an ETF or a mutual fund. A total market index ETF and a total market index mutual fund carry essentially the same risk.
Q: What is an expense ratio and does it really matter? An expense ratio is the annual fee a fund charges, expressed as a percentage of your investment. At 0.015%, FSKAX costs you $1.50 per year for every $10,000 invested. At 1%, a fund costs you $100 for the same amount. Over 30 years that gap is enormous.
Q: Do I need a lot of money to start investing in mutual funds or ETFs? Not anymore. FSKAX has no minimum investment at Fidelity. ETFs can be purchased in fractional shares at Fidelity and Schwab, so you can start with $10 or $25 if that’s what you have. Here’s more on starting with a small amount.
Q: Should I put ETFs or mutual funds in my Roth IRA? Either works well inside a Roth IRA because the tax efficiency difference between them doesn’t apply in a tax-sheltered account. I use FSKAX in mine because it’s cheap, it’s simple, and the automatic investing setup works exactly the way I want it to.