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.
When I opened my Roth IRA at Fidelity at 19, the first thing I did was go looking for “the best ETF for beginners.” Every article I found spent 2,000 words explaining why both VOO and VTI were great without actually telling me which one to buy. I found that genuinely frustrating.
So here’s my attempt to do better. VOO and VTI are two of the most widely held ETFs in the world, both from Vanguard, both with rock-bottom expense ratios, and both perfectly reasonable choices for someone just starting out. They’re also not identical, and the differences are worth understanding before you just pick one because someone on Reddit told you to.
| ETF | Tracks | Expense Ratio | # of Holdings | Best For |
|---|---|---|---|---|
| VOO | S&P 500 | 0.03% | ~503 | Investors who want large-cap U.S. exposure |
| VTI | Total U.S. Market | 0.03% | ~3,700 | Investors who want broader U.S. diversification |
| Both | U.S. equities | 0.03% | Varies | Long-term buy-and-hold beginners |
The expense ratio is the same. That’s actually important context before we go any further.
What You’re Actually Buying
VOO: The S&P 500 in a Single Ticker
VOO tracks the S&P 500, which is 503 of the largest U.S. companies weighted by market cap. You’re getting Apple, Microsoft, Nvidia, Amazon, Meta and everyone else in that tier. It’s the index most people mean when they say “the market went up today.”
The companies inside VOO have to meet specific criteria to be included, things like market cap above $14.5 billion, positive earnings over the trailing year, and minimum liquidity thresholds. So there’s a quality filter baked in. You’re not buying every large company, you’re buying the ones that passed a fairly demanding screen.
VOO’s current price per share is around $520 (it fluctuates, obviously). The 10-year annualized return through early 2026 has been roughly 12.8% annually, though past performance doesn’t tell you what the next decade looks like. What it does tell you is that this fund has a long, verifiable track record.
VTI: The Whole U.S. Market
VTI tracks the CRSP U.S. Total Market Index, which holds roughly 3,700 stocks. That includes everything in VOO plus mid-cap and small-cap companies that the S&P 500 excludes. You’re getting companies at basically every size tier of the U.S. economy.
The practical question is how different that actually makes it. Because VOO’s holdings make up about 82% of VTI by weight, the two funds move together almost identically day to day. The 10-year correlation between them is above 0.99. You’re not getting dramatic diversification by choosing VTI over VOO. You’re getting incremental coverage of a broader slice of the market.
That said, small-cap and mid-cap stocks have historically outperformed large-caps over very long time horizons, at least in some periods. Whether that holds going forward is genuinely uncertain. I’m not going to pretend I can tell you which will outperform over the next 20 years. Nobody can.
How to Actually Choose Between Them
This is the part most articles avoid. They hedge so hard they end up saying nothing useful. I’ll try not to do that.
If you’re investing in a Roth IRA at Fidelity like I do, you actually can’t buy VOO or VTI directly anyway. Fidelity has its own equivalent funds: FSKAX mirrors VTI’s strategy and FXAIX mirrors VOO’s strategy, both with 0% expense ratios. I invest primarily in FSKAX for that exact reason. No transaction fees, no commission, and a 0.015% expense ratio that rounds down to effectively nothing.
But if you’re using a Vanguard account, a brokerage like Schwab, or buying inside something like a taxable account at Fidelity where you’re purchasing ETFs directly, VOO and VTI are both genuinely available and worth comparing.
My honest take: if you have no strong opinion, buy VTI. You get everything VOO has plus the rest of the market. The cost is identical. The added diversification is small but it costs you nothing, and you won’t be sitting there years from now wondering if small-caps had a decade you missed entirely.
If you already hold international funds and want deliberate large-cap U.S. exposure specifically, VOO makes more sense. It gives you exactly what it says with no ambiguity about what’s inside.
The real mistake isn’t choosing the wrong one between these two. It’s spending three months researching them and buying nothing. The magic of compound interest doesn’t start until you actually have money invested.
Where to Buy Either One
Vanguard is the obvious place, but it’s not your only option and honestly might not be the best interface for a first-time investor. Fidelity and Schwab both let you buy VOO and VTI with no commission and no account minimum. Fidelity’s fractional shares program lets you invest as little as $1 in either fund, which matters if you’re starting with a small amount.
If you’re opening a Roth IRA specifically, the contribution limit for 2026 is $7,000 if you’re under 50 and have at least that much in earned income. The income phase-out for single filers starts at $150,000, so most college students and recent grads have nothing to worry about there. I walked through the full setup process in this article on opening a Roth IRA as a college student if you want the step-by-step.
Both ETFs are also available inside most 401(k) plan lineups, though your employer’s plan might offer them under institutional share classes with slightly different tickers. The underlying strategy is the same.
One thing I’d push back on: if you want to try a more hands-off approach entirely, something like Betterment automates the allocation and rebalancing for you using ETFs very similar to these. I wrote a full breakdown of Betterment for college students if that’s closer to what you’re looking for. It costs 0.25% annually, which is more than buying VOO or VTI yourself, but it also does more for you.
The Part Nobody Tells You
The difference between VOO and VTI is genuinely small. I want to be clear about that. You’re not making a life-altering decision here. Both are diversified, both are cheap, and both are designed to be held for decades without touching them.
The first individual stock I ever bought was a company I thought I understood well. I sold it at a loss eight months later. After that, I switched entirely to index funds and haven’t looked back. The appeal isn’t that index funds are exciting. It’s that they’re not supposed to be.
Whether you go with VOO at 0.03% or VTI at 0.03%, you’re making a fundamentally sound decision. The version of this where you lose is the version where you wait for perfect information that never arrives.
Frequently Asked Questions
Q: Is VOO or VTI better for a Roth IRA? Both work well inside a Roth IRA. If you’re at Fidelity, FXAIX (VOO equivalent) and FSKAX (VTI equivalent) have 0% expense ratios and no minimums, which makes them slightly better options than buying the Vanguard ETFs directly.
Q: What’s the main difference between VOO and VTI? VOO holds around 503 large-cap U.S. companies that meet S&P 500 criteria. VTI holds roughly 3,700 stocks across large, mid, and small-cap U.S. companies. Because large-caps dominate by market weight, the two funds perform almost identically most of the time.
Q: Can I buy fractional shares of VOO or VTI? Yes, at Fidelity you can invest as little as $1 in either fund through their fractional shares program. Schwab and several other brokerages offer similar options. This makes it easy to start with whatever amount you actually have.
Q: Do VOO and VTI pay dividends? Both pay quarterly dividends. VOO currently yields around 1.3% annually and VTI is close to the same. Inside a Roth IRA those dividends reinvest tax-free, which over decades is a meaningful advantage.
Q: Should a 20-year-old with $500 to invest buy VOO or VTI? Honestly either is fine, but I’d lean VTI for slightly broader exposure at zero extra cost. The more important question is just getting the $500 invested rather than leaving it in a checking account earning nothing.