I opened my Roth IRA at 19 with the first paycheck that felt like real money. Put $400 into FSKAX at Fidelity. Took about 20 minutes to set up and was completely anticlimactic. That was entirely the point.
A Roth IRA is probably the best account a 21-year-old can own, but the account itself does nothing. What you put inside it is what actually matters. Most beginners overthink this part. You don’t need seven ETFs and a sector rotation strategy. You need one or two solid funds and enough consistency to keep buying them.
The Best ETFs for a Beginner Roth IRA
Here’s a quick look at the funds I’m covering and what each one is best suited for.
| ETF | Best For | Expense Ratio |
|---|---|---|
| FSKAX (Fidelity Total Market Index Fund) | Set-it-and-forget-it simplicity | 0.015% |
| VTI (Vanguard Total Stock Market ETF) | Brokerage-flexible total market exposure | 0.03% |
| VOO (Vanguard S&P 500 ETF) | Pure large-cap US index investing | 0.03% |
| VXUS (Vanguard Total International Stock ETF) | International diversification paired with VTI or VOO | 0.05% |
| BND (Vanguard Total Bond Market ETF) | Conservative allocation or near-retirement balance | 0.03% |
FSKAX — Fidelity Total Market Index Fund
This is what I actually own. FSKAX holds roughly 2,700 US stocks across every market cap, from Apple and Microsoft down to small-cap companies most people have never heard of. The expense ratio is 0.015%, which is essentially free. At a $10,000 balance that’s $1.50 a year.
It’s technically a mutual fund rather than an ETF, but it functions identically inside a Fidelity Roth IRA. No minimum investment, no commission, no nonsense. If your Roth IRA is at Fidelity, there’s genuinely no reason to look elsewhere for your core holding.
The one catch: FSKAX is Fidelity-only. If you ever transfer your account to Vanguard or Schwab, you’d need to sell and rebuy in a different fund. Inside a Roth IRA that’s not a taxable event, so it’s not a real problem, just worth knowing.
VTI — Vanguard Total Stock Market ETF
VTI is the ETF equivalent of FSKAX and arguably the most recommended beginner fund on the internet. It holds about 3,600 US stocks, trades on an exchange like a stock, and carries a 0.03% expense ratio. The 0.015% gap between VTI and FSKAX amounts to about $1.50 per year on a $10,000 balance. Not worth losing sleep over.
The advantage VTI has is portability. It trades at any brokerage without issue. If you’re at Schwab, Fidelity, or anywhere else, you can buy VTI. That flexibility is worth something if you think you might move accounts later.
I use FSKAX because I’m at Fidelity and it’s marginally cheaper. If I were somewhere else, I’d own VTI without hesitation. For a long-term hold inside a Roth IRA, the two are functionally identical.
VOO — Vanguard S&P 500 ETF
VOO tracks the S&P 500, which means it holds the 500 largest US companies by market cap. It has a 0.03% expense ratio and is probably the most recognizable index fund in the world. Warren Buffett has publicly said most investors would be better off just buying an S&P 500 index fund and leaving it alone. That’s not nothing.
The difference between VOO and VTI is that VOO skips the small and mid-cap stocks. Historically those smaller companies have outperformed large-caps over very long periods, at least in most of the data I’ve looked at, though I’d caveat that past performance doesn’t guarantee anything. VTI gives you exposure to all of them. VOO gives you the cleaner, more stable slice of the market.
For someone who wants simplicity and has no interest in debating market cap weighting, VOO is completely solid. It’s outperformed most actively managed funds over 10-plus year periods and it’ll cost you almost nothing to hold.
VXUS — Vanguard Total International Stock ETF
The US makes up roughly 60% of global stock market capitalization. If you only own FSKAX or VTI, you’re ignoring the other 40%. That might be fine. It also might not. Nobody knows whether US stocks will continue to outperform international ones over the next 30 years.
VXUS holds over 8,500 stocks across developed and emerging markets outside the US. The expense ratio is 0.05%, still extremely cheap. Most people who use VXUS pair it with VTI or VOO at a ratio somewhere around 80/20 or 70/30 in favor of US stocks.
I don’t currently hold VXUS but I’ve been thinking about adding it as my Roth IRA grows. The honest reason I don’t have it yet is I wanted simplicity when I was starting out. A single total market fund is easier to stick with than a two-fund portfolio when you’re still building the habit. Understanding why compound interest rewards consistency over time is part of why I prioritized getting the habit right before optimizing the allocation.
BND — Vanguard Total Bond Market ETF
BND holds thousands of US investment-grade bonds including Treasuries, corporate bonds, and mortgage-backed securities. The expense ratio is 0.03%. It’s less volatile than stock ETFs, which also means it grows more slowly over time.
At 21, I hold exactly zero BND. Bonds are a stabilizing force in a portfolio, and that’s valuable when you’re close to needing the money. When you’re 21 with 40-plus years until retirement, stability isn’t the goal. Growth is. I’m not touching BND until I’m significantly older, though I could see adding a small allocation in my 40s.
The reason I’m including it here is that some people genuinely cannot stomach watching their portfolio drop 30% in a bad year. If that describes you, a small BND allocation isn’t wrong. It’s just a tradeoff between peace of mind and long-term returns. Know what you’re trading.
How to Actually Choose
The honest answer is that most beginners should pick one fund, FSKAX if you’re at Fidelity, VTI if you’re anywhere else, and hold it. If you want international exposure, add VXUS at maybe 20-25% of your portfolio. That’s it. The people who outperform the most complex portfolios are often the ones doing the least.
The expense ratio matters a lot more than people realize when you’re talking about decades of compounding. A 1% annual fee on a $100,000 portfolio is $1,000 a year, gone. The funds I listed above all charge between 0.015% and 0.05%. You’re paying almost nothing, which means almost everything your money earns stays yours.
Don’t chase thematic ETFs, sector funds, or anything with “innovation” or “disruption” in the name. I bought one individual stock freshman year, a company I was convinced I understood. Sold at a loss eight months later. Switched to index funds and haven’t looked back. There’s a version of that lesson with high-fee thematic ETFs too, and it’s not one you need to learn firsthand.
A Note on Where You Open Your Roth IRA
Your brokerage matters. Fidelity and Vanguard are both solid with zero account minimums for a Roth IRA, no commissions on ETF trades, and no nonsense. Fidelity’s interface is more beginner-friendly in my experience. Vanguard’s is clunkier but perfectly functional.
Avoid any brokerage charging you a commission per trade or a monthly account fee to hold a Roth IRA. Those fees compound against you the same way returns compound for you. The math works both directions.
The contribution limit for 2025 is $7,000 if you’re under 50. You can only contribute earned income, so if you made $4,000 at a summer job, your max is $4,000. Roth contributions use after-tax dollars, meaning withdrawals in retirement are completely tax-free. That tax-free growth over 40-plus years is the whole reason this account is worth prioritizing before anything else.
If you’re new to how compounding works mechanically, this breakdown of compound interest and why it matters in college will give you the foundation to understand why starting at 21 is worth so much more than starting at 30.
You don’t need to get this perfect. You just need to start.
Frequently Asked Questions
Q: Should I put all my Roth IRA in one ETF or spread it across several? One total market ETF like FSKAX or VTI is a completely legitimate strategy on its own because it already holds thousands of companies. Adding more funds only makes sense if you have a specific reason like international exposure or a bond allocation.
Q: What’s the difference between an ETF and a mutual fund like FSKAX? ETFs trade on exchanges throughout the day like stocks, while mutual funds price once at market close. Inside a Roth IRA this distinction is mostly irrelevant since you’re not day-trading either one.
Q: How much do I need to start investing in a Roth IRA ETF? At Fidelity you can open a Roth IRA with no minimum and buy FSKAX with as little as $1. At Vanguard, ETFs like VTI trade at their current share price, which is typically around $270 to $290, so you’d need at least that much to buy one share.
Q: Is it safe to put my emergency fund in my Roth IRA? No. Your emergency fund should stay liquid and accessible, not invested in the market where it can drop 20% right when you need it. I keep mine in a Marcus by Goldman Sachs high yield savings account at 4.10% APY, completely separate from my Roth IRA.
Q: Can I withdraw my Roth IRA contributions if I really need the money? You can withdraw your contributions (not earnings) at any time without penalty since you already paid taxes on that money. That said, pulling money out defeats the compounding math that makes the account worth having in the first place.
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.