S&P 500 vs Total Stock Market Fund: Which Is Better in 2024?

When you’re building your investment portfolio, one of the most fundamental decisions you’ll face is choosing between an S&P 500 index fund and a total stock market fund. Both are excellent choices for long-term wealth building, but they take slightly different approaches to capturing the growth of American companies.

The S&P 500 tracks the 500 largest U.S. companies by market capitalization, representing roughly 80% of the total U.S. stock market value. A total stock market fund, on the other hand, casts a much wider net, typically holding 3,000 to 4,000 stocks across large, medium, and small companies. This fundamental difference creates unique advantages and considerations for each approach.

Understanding these distinctions isn’t just academic—it can impact your returns, diversification, and overall investment strategy. The choice between these two powerhouse options often comes down to your personal preferences about diversification, risk tolerance, and investment philosophy.

What Exactly Are You Getting With Each Fund?

S&P 500 Index Funds

S&P 500 funds give you ownership in America’s corporate giants. When you invest in an S&P 500 fund, you’re buying pieces of companies like Apple (which typically represents about 7% of the index), Microsoft, Amazon, Google, and Tesla. These are household names that generate massive revenues and have proven their ability to compete on a global scale.

The fund is market-cap weighted, meaning larger companies have more influence on your returns. The top 10 holdings usually make up around 30% of the entire index. This concentration means that when mega-cap tech stocks soar—as they did during 2020-2021—your S&P 500 fund benefits significantly.

Total Stock Market Funds

Total stock market funds take a “buy everything” approach to U.S. stocks. Popular options like Vanguard’s Total Stock Market Index Fund (VTSAX) or Fidelity’s Total Market Index Fund (FZROX) hold thousands of companies across the spectrum.

While large-cap stocks still dominate (since these funds are also market-cap weighted), you also get exposure to mid-cap companies with market values between $2-10 billion and small-cap companies worth less than $2 billion. This might include regional banks, specialty retailers, or emerging technology companies that haven’t yet reached S&P 500 status.

Performance Comparison: The Numbers Tell an Interesting Story

Over the past 20 years, S&P 500 funds have actually outperformed total stock market funds slightly, returning approximately 10.2% annually versus 9.9% for total market funds. However, this margin is much closer than many investors realize, and it hasn’t been consistent across all time periods.

During certain market cycles, small and mid-cap stocks (which total market funds include but S&P 500 funds don’t) have significantly outperformed large caps. For example, from 2000-2010, small-cap stocks generally did better than large caps as the market recovered from the dot-com crash.

Recent Performance Patterns

The 2010s heavily favored large-cap growth stocks, particularly in technology. This gave S&P 500 funds an edge since companies like Apple, Microsoft, and Amazon experienced explosive growth. However, market leadership can shift. If small and mid-cap stocks enter a sustained outperformance cycle, total market funds would likely pull ahead.

Here’s what $10,000 invested in each strategy would have grown to over different periods (approximate values):

• 5 years: S&P 500: $18,400, Total Market: $18,200
• 10 years: S&P 500: $27,100, Total Market: $26,800
• 20 years: S&P 500: $67,300, Total Market: $65,400

Diversification: Broader vs. Deeper

The diversification debate between these options is nuanced. S&P 500 funds offer excellent diversification across sectors and industries, but they’re limited to large-cap stocks. You’re missing out on roughly 20% of the total U.S. stock market value.

Total stock market funds provide broader diversification across market capitalizations. This includes:

• Large-cap stocks (80% of the fund): Stable, established companies
• Mid-cap stocks (15% of the fund): Growing companies with expansion potential
• Small-cap stocks (5% of the fund): Smaller companies with higher growth potential but more volatility

The Diversification Reality Check

While total market funds are technically more diversified, the practical difference is smaller than you might expect. Since both funds are market-cap weighted, large companies still dominate total market funds. The top 500 companies in a total market fund make up roughly 85% of the fund’s value—not dramatically different from an S&P 500 fund’s 100% large-cap allocation.

Cost Considerations: Every Basis Point Matters

Both fund types are available with extremely low expense ratios, but there are subtle differences worth noting.

Expense Ratios by Provider

S&P 500 Funds:

• Fidelity FXAIX: 0.015%
• Vanguard VOO: 0.03%
• Charles Schwab SWPPX: 0.02%

Total Stock Market Funds:

• Fidelity FZROX: 0.00%
• Vanguard VTI: 0.03%
• Charles Schwab SWTSX: 0.03%

The differences are minimal—we’re talking about $1.50 to $3.00 per year on a $10,000 investment. Over decades, these small differences compound, but they’re unlikely to be the deciding factor in your choice.

Trading Costs and Minimums

Most major brokerages now offer commission-free trading on their own fund families. However, if you want to buy Vanguard funds through a Fidelity account (or vice versa), you might face transaction fees. This makes it practical to stick with your broker’s house brand funds.

Many funds have eliminated minimum investments entirely, though some still require $1,000 to $3,000 to start. ETF versions of these funds (like VTI for total market or VOO for S&P 500) can be purchased for the price of a single share, typically under $500.

Tax Efficiency: Minimal Differences in Practice

Both S&P 500 and total stock market index funds are highly tax-efficient investments. They generate minimal taxable distributions because they rarely buy and sell holdings—they simply track their respective indexes.

Capital Gains Distributions

In 2025, most major S&P 500 and total stock market funds distributed less than 0.5% of their value as taxable capital gains. This tax efficiency is one of the major advantages of index funds over actively managed funds, which might distribute 5-10% annually.

Tax-Loss Harvesting Opportunities

Total stock market funds might offer slightly better tax-loss harvesting opportunities if you’re working with a financial advisor or using automated platforms like Betterment or Wealthfront. The broader range of holdings can provide more options for harvesting losses while avoiding wash sale rules.

Choosing Based on Your Investment Goals

Your choice between these funds should align with your personal investment philosophy and goals.

Choose S&P 500 If You:

• Believe large, established companies will continue outperforming smaller ones
• Want exposure to the most liquid, stable part of the U.S. stock market
• Prefer the simplicity of owning the “500 most important” U.S. companies
• Are satisfied with the sector allocation that comes with market-cap weighting
• Value the extensive research and historical data available on S&P 500 performance

Choose Total Stock Market If You:

• Want to own the entire U.S. stock market in one fund
• Believe small and mid-cap stocks deserve a place in your portfolio
• Prefer maximum diversification across market capitalizations
• Want to avoid making bets on which market segments will outperform
• Like the philosophical appeal of owning “everything”

Building Your Portfolio Strategy

The Core Holdings Approach

Many successful investors use either an S&P 500 or total stock market fund as their core U.S. equity holding, then add complementary funds around it. For example:

• 70% S&P 500 or Total Stock Market Fund
• 20% International developed markets fund
• 10% Emerging markets fund

The Three-Fund Portfolio

Both funds work excellently in the popular three-fund portfolio strategy:

• U.S. Stocks: 60-70% (S&P 500 OR Total Stock Market)
• International Stocks: 20-30%
• Bonds: 10-20%

Rebalancing Considerations

Whether you choose S&P 500 or total market funds, plan to rebalance your portfolio annually or when allocations drift more than 5% from your targets. This disciplined approach helps you buy low and sell high systematically.

Final Thoughts

The choice between S&P 500 and total stock market funds is less critical than actually starting to invest consistently. Both are excellent foundational holdings that will serve you well over decades of investing.

If you’re torn between the two, consider this: the performance difference has been minimal historically, and both provide excellent exposure to U.S. economic growth. Total stock market funds offer slightly broader diversification, while S&P 500 funds provide focused exposure to America’s corporate leaders.

Many successful investors flip a coin between these options and never look back, focusing instead on the more important factors: investing regularly, keeping costs low, staying invested during market volatility, and maintaining appropriate diversification across asset classes and geographies.

The most important decision isn’t S&P 500 versus total market—it’s choosing one of these excellent options and getting started with your long-term wealth-building journey. Both funds have created substantial wealth for patient investors, and either choice puts you on the path toward financial independence.