The Cheapest S&P 500 Index Funds

Check Out the Index Funds With Lowest Expense Ratios

While cheaper doesn't necessarily mean better, the best S&P 500 index funds tend to be the ones with the lowest expense ratios. You shouldn't base your decision to invest in an S&P 500 index solely on price, but if you plan to invest long-term, the seemingly small differences in fees can add up to a good amount of money. Here are some of the qualities of index funds you'll want to analyze before thinking of buying.

Analyzing the Tracking Error

The tracking error is a measure of an index fund's effectiveness in replicating or matching the performance of the benchmark index, which in this case, is the S&P 500. One drawback of researching and analyzing tracking error is that mutual fund families do not publicly display the tracking error of their index funds. However, there are a few data points you can research to analyze performance tracking.

You can go to a site, such as Morningstar, Lipper, or Kiplinger's, and see how close the historical performance of the fund has been to the target benchmark. If the returns are below the benchmark by roughly the same amount as the fund's expense ratio, the tracking error is close. For example, if a fund has an expense ratio of 0.2%, a 5-year annualized return of 10%, and a benchmark return of 10.2%, the tracking error is precise.

Analyzing the Expense Ratio

After looking at the historical performance, while taking the expense ratio into account, which will tell you how well the fund has tracked the benchmark index in the past. For example, if an S&P 500 index mutual fund has an expense ratio of 0.2%, a 5-year annualized return of 10%, and a low tracking error might have an annualized return of roughly 9.8%. This means that the only difference between the index and the mutual fund's return is attributed to the fund's expenses.

Before Investing

Before deciding on an index fund to invest in, be sure to keep in mind other fees, such as trading costs. For example, if you already have an account at Vanguard, you may be charged a transaction fee to purchase a mutual fund, like the Schwab S&P 500 Index, which is outside of their fund family. Typical transaction fees range between $10–$20.

If you are dollar-cost averaging by periodically purchasing shares of your S&P 500 index fund, the expense ratio may be lower, but the trading fees can make the fund more expensive than other options. You will find some of the cheapest S&P 500 funds that you can buy with $10,000 or less listed below.

Fidelity 500 Index Fund

investing_index funds_chart
Fidelity Spartan 500 Index. Getty Images

Symbol: FXAIX (Formerly FUSEX)

Net Expense Ratio: 0.015%

Minimum Initial Investment: $0

Schwab S&P 500 Index Fund

investing_index funds_screen
Schwab S&P 500 Index. Getty Images

Symbol: SWPPX

Net Expense Ratio: 0.02%

Minimum Initial Investment: $0

State Street S&P 500 Index Fund

SSgA S&P 500 Index Fund. Getty Images

Symbol: SVSPX

Net Expense Ratio: 0.16%

Minimum Initial Investment: $10,000

Vanguard 500 Index Fund Investor Shares

Vanguard S&P 500 Index. Getty Images

Symbol: VFINX

Net Expense Ratio: 0.14%

Minimum Initial Investment: $3,000

T. Rowe Price Equity Index 500 Fund

investing_US dollar
T. Rowe Price Equity Index 500 Fund. Getty Images

Symbol: PREIX

Net Expense Ratio: 0.21%

Minimum Initial Investment: $2,500 taxable account, $1,000 IRAs

USAA S&P 500 Index Fund Member Shares

investing_coins_flower pots
USAA S&P 500 Index Member Shares. Getty Images

Symbol: USSPX

Net Expense Ratio: 0.25%

Minimum Initial Investment: $3,000

Although S&P 500 index funds are all constructed to match and track the S&P 500, they are not the same across the board. Most notably is the difference in fees between funds. A difference in fees between 0.01% and 0.03% may not be significant, but differences of 0.05% or more between funds can make a significant difference on your wealth through your working years leading into retirement.

Article Sources

  1. Fidelity. "Fidelity 500 Index Fund." Accessed March 29, 2020.

  2. Charles Schwab. "Schwab S&P 500 Index Fund." Accessed March 29, 2020.

  3. State Street Global Advisors. "State Street S&P 500 Index Fund - Class N." Accessed March 29, 2020.

  4. Vanguard. "Vanguard 500 Index Fund Investor Shares (VFINX)." Accessed March 29, 2020.

  5. T. Rowe Price. "Equity Index 500 Fund." Accessed March 29, 2020.

  6. Yahoo! Finance. "USAA 500 Index Fund Member Shares (USSPX)." Accessed March 29, 2020.