How to Invest in the S&P 500: Step-by-Step

The S&P 500 tracks 500 large U.S. companies. You don't buy the index directly—you buy a fund that tracks it. VOO (Vanguard), IVV (iShares), and SPY (State Street) are popular ETFs. VFIAX is Vanguard's mutual fund version. All have low fees. Here's how to get started.

What Is the S&P 500?

The Index

The S&P 500 is a list of 500 large U.S. companies—Apple, Microsoft, Amazon, Berkshire Hathaway, and hundreds more. It represents about 80% of U.S. stock market value. It's weighted by market cap: bigger companies have more influence.

Why Invest in It?

• Diversification. One fund, 500 companies. You're not betting on a single stock.
• Long track record. Decades of data. Historically solid long-term returns.
• Low cost. Index funds that track it charge 0.03–0.09% per year.
• Simplicity. One fund. Buy and hold. No stock-picking.

Warren Buffett has recommended the S&P 500 for most investors. It's a default choice for U.S. stock exposure.

Popular S&P 500 Funds

VOO (Vanguard S&P 500 ETF)

• Expense ratio: 0.03%
• Minimum: 1 share or fractional
• Best for: Vanguard customers, taxable accounts, any broker

IVV (iShares Core S&P 500 ETF)

• Expense ratio: 0.03%
• Minimum: 1 share or fractional
• Best for: Any broker, taxable accounts

SPY (SPDR S&P 500 ETF)

• Expense ratio: 0.0945%
• Minimum: 1 share
• Best for: Traders (high liquidity). Slightly higher fee—VOO and IVV are usually better for buy-and-hold.

VFIAX (Vanguard 500 Index Fund)

• Expense ratio: 0.03%
• Minimum: $3,000
• Best for: Vanguard customers who prefer mutual funds, automatic investing

Any of these works. VOO and IVV are the most common for ETFs. Pick one and stick with it. See our best index funds for beginners.

Steps to Invest

Step 1: Open a Brokerage Account

Choose a broker: Vanguard, Fidelity, Schwab, or others. Open an IRA (for retirement) or taxable brokerage (for flexibility). Takes about 10 minutes online. You'll need ID and bank info for funding.

Step 2: Fund the Account

Transfer money from your bank. Usually 1–3 business days. Minimum: whatever your broker requires. Vanguard, Fidelity, and Schwab have $0 minimum for brokerage accounts.

Step 3: Buy Shares of an S&P 500 Fund

Search for VOO, IVV, or VFIAX (if at Vanguard). Place a market or limit order. For ETFs: buy whole or fractional shares. For mutual funds: buy a dollar amount (e.g., $500 of VFIAX). Done.

Example: You have $1,000. VOO is $450/share. Buy 2 shares ($900) or use fractional to invest the full $1,000. Next month, add another $200. Repeat.

Step 4: Set Up Automatic Purchases

Most brokers let you set up automatic investments. Pick the fund (VOO or VFIAX), amount ($200/month), and date (1st or payday). Money moves from your bank and buys shares automatically. Dollar cost averaging without thinking.

Step 5: Hold and Add

Don't sell when the market drops. Add regularly. Check annually if you want. Ignore daily noise. Long-term works.

IRA vs Taxable: Where to Hold It

IRA (Roth or Traditional)

Tax-advantaged. Roth: pay tax now, withdraw tax-free in retirement. Traditional: deduct now, pay tax on withdrawal. Good for retirement savings. No capital gains tax on trades inside the account.

Taxable Brokerage

No tax break, but no withdrawal restrictions. Use for money you might need before 59½. You'll pay tax on dividends and capital gains when you sell. ETFs like VOO are tax-efficient—low turnover, fewer taxable events.

Recommendation

Retirement savings → IRA. Flexible savings (house, etc.) → taxable. You can hold the same fund in both. See when to start investing.

S&P 500 vs Total Market

The Difference

S&P 500 = 500 large U.S. companies. Total market (e.g., VTI) = S&P 500 plus mid and small caps—4,000+ stocks. Total market is slightly more diversified.

Returns Over Time

Very similar. S&P 500 and total market have tracked each other closely for decades. Don't stress the choice. Both are excellent core holdings.

When to Choose S&P 500

You want simplicity, a household name, and large-cap focus. VOO and IVV are great.

When to Choose Total Market

You want maximum U.S. diversification. VTI, FZROX, or SWTSX. Slight edge in diversification; negligible difference in practice.

Adding International and Bonds Later

S&P 500 Is U.S. Only

You're not diversified globally. Consider adding international (10–30% of stocks) later: VXUS, VTIAX, or similar.

Bonds for Lower Volatility

As you approach retirement, adding bonds (BND, AGG) can reduce volatility. Not required to start. A 100% S&P 500 portfolio is fine for young investors with long time horizons.

Common Questions

How Much Should I Invest?

As much as you can afford for the long term. $100/month, $500/month—whatever fits your budget. See how much to invest each month.

When Will I See Gains?

Markets fluctuate. Some years +20%, some -20%. Over 10+ years, the historical average is around 7–10% per year. Don't expect smooth growth. Think in decades.

What If the Market Crashes?

Don't sell. Keep adding. Your regular purchases buy more shares when prices are low. Crashes are painful short-term but often create opportunity for long-term investors. See dollar cost averaging.

Can I Invest with $100?

Yes. Fractional shares let you buy $100 of VOO even if one share costs $450. See how to start investing with $100.

Frequently Asked Questions

Is the S&P 500 a good investment?

For long-term U.S. stock exposure, yes. Low cost, broad diversification, strong history. It's a core holding for many index investors.

What's the best S&P 500 fund?

VOO and IVV (ETFs) and VFIAX (mutual fund) are all excellent—0.03% expense ratio. SPY has a slightly higher fee. Pick VOO or IVV for ETFs; VFIAX if you prefer mutual funds and have $3,000.

How do I buy the S&P 500?

Open a brokerage account, fund it, and buy shares of an S&P 500 index fund (VOO, IVV, VFIAX). You can't buy the index itself—only funds that track it.

Should I invest in S&P 500 or total market?

Both work. Total market (VTI) is slightly more diversified. S&P 500 (VOO) is simpler and well-known. Returns are very similar. Pick one and move on.

Can I automate S&P 500 investments?

Yes. Set up automatic purchases at your broker—monthly or per paycheck. Same fund, same amount. Dollar cost averaging on autopilot.

The Bottom Line

Investing in the S&P 500 is simple: open a brokerage, fund it, buy VOO, IVV, or VFIAX. Set up automatic purchases. Hold long-term. It's diversified, low-cost, and a proven way to own U.S. large caps. Add international and bonds later if you want. For many investors, the S&P 500 is the core of their portfolio. Start with one fund and build from there.