The Vanguard S&P 500 fund is one of the most popular investments in the world, holding well over $1 trillion across its share classes. It gives you a stake in 500 of the largest U.S. companies in a single purchase, for an annual cost of about $3 per $10,000 invested. Here is how it works and which version fits you, with numbers current as of June 2026.
What the Vanguard S&P 500 Fund Is
The fund tracks the S&P 500 Index, a basket of roughly 500 large American companies including Apple, Microsoft, Amazon, and hundreds more. When you buy the fund, you own a tiny slice of all of them at once.
This built-in diversification is the main appeal. Instead of betting on one company, your money spreads across the broad U.S. large-cap market. If a single company stumbles, it barely moves your total balance.
Vanguard offers this fund in two main forms: an ETF called VOO and a mutual fund called VFIAX. They track the same index and hold the same companies.
VOO: The ETF Version
VOO is the exchange-traded fund version. It trades like a stock throughout the day, so its price moves in real time during market hours.
Key facts as of June 2026:
- Ticker: VOO
- Expense ratio: 0.03%, or about $3 a year per $10,000 invested
- Minimum: the price of one share, or as little as $1 with fractional shares at many brokers
- Best for: investors who want low cost and flexible, intraday buying
VOO is easy to buy through almost any brokerage, not just Vanguard. Its tiny expense ratio is one of the lowest available for an S&P 500 fund.
VFIAX: The Mutual Fund Version
VFIAX is the Admiral Shares mutual fund version of the same strategy. Unlike the ETF, it prices once per day after the market closes, so all buy and sell orders that day get the same price.
Key facts as of June 2026:
- Ticker: VFIAX
- Expense ratio: 0.04%, just slightly higher than VOO
- Minimum: $3,000 to start
- Best for: investors who prefer setting up automatic recurring investments in exact dollar amounts
The $3,000 minimum is the main hurdle. Once you are in, VFIAX makes it simple to auto-invest a fixed dollar amount each month, something that is harder with whole ETF shares.
VOO vs VFIAX: Side by Side
| Feature | VOO (ETF) | VFIAX (Mutual Fund) |
|---|---|---|
| Expense ratio | 0.03% | 0.04% |
| Minimum investment | 1 share (or $1 fractional) | $3,000 |
| Trading | Intraday, like a stock | Once daily after close |
| Automatic investing | Limited at some brokers | Easy in exact dollars |
| Index tracked | S&P 500 | S&P 500 |
The practical differences are small. VOO has a slightly lower fee and a far lower entry point. VFIAX shines if you want hands-off, exact-dollar automatic investing and already have $3,000.
What Returns to Expect
The S&P 500 has returned about 10% a year on average over the long run since 1957. After inflation, the real return has been closer to 7% annually.
Those are long-term averages, not promises. The index has had losing years, sometimes dropping 20% or more, and it can stay down for stretches. This is a lower-risk way to own stocks because of diversification, but it is not risk-free, and past performance does not guarantee future results.
How to Buy It
You can buy VOO or VFIAX through a Vanguard account or most other brokerages. The steps are simple: open and fund an account, search the ticker, and place your order.
VOO is the easier starting point for small budgets thanks to fractional shares. If you have $3,000 and want automatic recurring investments, VFIAX may suit you better.
Beginner-friendly apps make this approachable. Robinhood offers commission-free trades and fractional shares of VOO with no account minimum.
Robinhood
Robinhood
Robinhood is a trading platform that brings stocks, ETFs, options, futures, prediction markets, crypto, and retirement accounts together in one app.
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$0 commission on stocks, ETFs, and options.
Pros
Zero-commission trading on stocks, ETFs, and options
Cons
Best perks (high APY, lower margin rates) require Gold subscription ($5/month)
Public also supports commission-free ETF and fractional investing in a clean interface, which makes buying a slice of VOO straightforward even with a small starting balance.
Public
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Investing for those who take it seriously. Invest in stocks, bonds, options, crypto & more.
Standout feature
A 5%+ yield Bond Account paired with 3.3% APY on cash — Public is one of the only consumer apps where idle and conservative money is treated as seriously as the equity portfolio.
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Free
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• Invest in stocks, bonds, crypto & more• Earn 3.3% APY* on your cash with no fees• 1% match when you transfer your portfolio• Lock in a 5%+ yield with a Bond Account
Cons
Customer support is in-app and email only, no phone
To watch your investments alongside your budget and net worth, Monarch Money links your accounts into one dashboard so you can track contributions and progress over time.
This is general education, not personalized advice. Expense ratios and terms can change, returns vary, and you should consider your own situation before investing.
Monarch Money
Monarch Money
Monarch Money simplifies personal finance by uniting all your accounts in one place—secure, ad-free, and built for couples. 50% off your first year when you sign up via Firstcard!
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#1 rated budgeting app (WSJ). 50% off first year via Firstcard.
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$14.99/mo or $99.99/yr ($8.33/mo)
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Beautiful, ad-free interface (4.9★ App Store). Best budgeting app for couples and families. Comprehensive account syncing and cash flow forecasting.
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No free tier — requires paid subscription.
Frequently Asked Questions
Is VOO or VFIAX better?
Neither is clearly better; they track the same index. VOO has a slightly lower expense ratio of 0.03% versus 0.04% and a much lower entry point. VFIAX is better suited to investors who want automatic recurring investments in exact dollar amounts and have the $3,000 minimum.
How much does the Vanguard S&P 500 fund cost?
The ETF version, VOO, charges an expense ratio of 0.03% as of June 2026, which is about $3 a year for every $10,000 invested. The mutual fund version, VFIAX, charges 0.04%. There are no trading commissions on these at major brokers.
Can I buy the Vanguard S&P 500 fund without a Vanguard account?
Yes, you can buy VOO through almost any brokerage, since it is an ETF that trades like a stock. VFIAX is a Vanguard mutual fund and is most easily bought through a Vanguard account, though some other brokers offer it too.
Is the Vanguard S&P 500 fund a safe investment?
It is considered a lower-risk way to own stocks because it spreads your money across 500 large companies. However, it is not risk-free. The S&P 500 can and does fall, sometimes sharply, so it is best suited for money you can leave invested for many years.
