⚡ Quick Answer
The best index funds of 2026 are FXAIX (Fidelity, 0.015% expense ratio), SWPPX (Schwab, 0.02%), and VOO (Vanguard, 0.03%) for S&P 500 exposure — plus FZROX (Fidelity, 0.00%) for zero-cost total market coverage. With the S&P 500 up roughly 11% year-to-date through May 2026, low-cost index funds remain the default choice for long-term wealth building.
Why Index Funds Still Win in 2026
After decades of research and real-world performance data, the verdict is in: most actively managed funds underperform their benchmark index over a 10-year period. Index funds solve this by tracking a market index — like the S&P 500 — instead of trying to beat it. The result is broad diversification, near-zero fees, and market-matching returns that compound dramatically over time.
In 2026, the case for index funds is stronger than ever. The S&P 500 returned approximately 18% in 2025 and is up roughly 11% year-to-date through May 2026. Wall Street analysts are forecasting an average full-year gain of around 12% for 2026, driven by continued earnings growth — with 85% of S&P 500 companies beating Q1 2026 estimates, well above the five-year average of 78%.
Index funds capture these gains automatically, without the drag of active management fees or the risk of a portfolio manager making the wrong call.
Best S&P 500 Index Funds of 2026
All S&P 500 index funds hold essentially the same 503 stocks in the same proportions. The only real differences are expense ratios, fund type, and account minimums.
1. FXAIX — Fidelity 500 Index Fund (Best Overall)
Expense ratio: 0.015% | Minimum: $0 | Type: Mutual Fund
FXAIX is the cheapest S&P 500 mutual fund available from a major broker. At just 0.015%, you pay $1.50 per year on every $10,000 invested. No account minimum, no transaction fee, available directly through Fidelity. Ideal for investors who want to set up automatic contributions and let the fund compound on autopilot.
2. SWPPX — Schwab S&P 500 Index Fund
Expense ratio: 0.02% | Minimum: $0 | Type: Mutual Fund
Schwab sits between Fidelity and Vanguard at 0.02%. No minimum investment, no transaction fee on the Schwab platform. The natural S&P 500 choice for investors already at Schwab.
3. VOO — Vanguard S&P 500 ETF
Expense ratio: 0.03% | Minimum: 1 share | Type: ETF
VOO is the most popular S&P 500 ETF in the world with over $1.5 trillion in assets. It trades like a stock on the NYSE and is available commission-free at most major brokerages.
4. IVV — iShares Core S&P 500 ETF
Expense ratio: 0.03% | Minimum: 1 share | Type: ETF
Functionally identical to VOO, IVV has slightly higher daily trading volume — a minor advantage for institutional investors but irrelevant for most individuals.
Best Total Market Index Funds of 2026
Total market funds go beyond the S&P 500 to include mid-cap and small-cap stocks, giving you exposure to roughly 3,500–4,000 U.S. companies. Historically, returns have been nearly identical to S&P 500 funds with slightly broader diversification.
5. FZROX — Fidelity ZERO Total Market Index Fund (Lowest Cost)
Expense ratio: 0.00% | Minimum: $0 | Type: Mutual Fund
FZROX charges absolutely nothing. The catch: it can only be held at Fidelity. For investors committed to Fidelity long-term, FZROX is unbeatable.
6. FSKAX — Fidelity Total Market Index Fund
Expense ratio: 0.015% | Minimum: $0 | Type: Mutual Fund
FSKAX is essentially FZROX with portability. At 0.015%, you pay a tiny fee but retain the ability to transfer shares to any brokerage.
7. VTI — Vanguard Total Stock Market ETF
Expense ratio: 0.03% | Minimum: 1 share | Type: ETF
VTI holds roughly 3,600 stocks. Available commission-free at most major brokerages and the core holding in many passive investors portfolios.
8. SWTSX — Schwab Total Stock Market Index Fund
Expense ratio: 0.03% | Minimum: $0 | Type: Mutual Fund
Schwab total market offering at 0.03% with no minimum investment. Ideal for Schwab customers who prefer mutual fund convenience.
Side-by-Side Comparison: Best Index Funds 2026
| Fund | Type | Covers | Expense Ratio | Minimum | Broker |
|---|---|---|---|---|---|
| FXAIX | Mutual Fund | S&P 500 | 0.015% | $0 | Fidelity |
| FZROX | Mutual Fund | Total Market | 0.00% | $0 | Fidelity only |
| FSKAX | Mutual Fund | Total Market | 0.015% | $0 | Fidelity |
| SWPPX | Mutual Fund | S&P 500 | 0.02% | $0 | Schwab |
| SWTSX | Mutual Fund | Total Market | 0.03% | $0 | Schwab |
| VOO | ETF | S&P 500 | 0.03% | 1 share | Any broker |
| IVV | ETF | S&P 500 | 0.03% | 1 share | Any broker |
| VTI | ETF | Total Market | 0.03% | 1 share | Any broker |
Open a Fidelity Account — $0 Minimum, $0 Fees
Fidelity offers the cheapest index funds available (FXAIX at 0.015%, FZROX at 0.00%) with no account minimums and no trading commissions.
Open Fidelity Account →How to Choose the Right Index Fund
With all of these funds delivering nearly identical returns before fees, the decision comes down to four factors:
1. Where do you already have accounts?
The cheapest fund at your existing brokerage beats switching platforms for a marginal fee difference. At Fidelity: FXAIX or FZROX. At Schwab: SWPPX or SWTSX. Anywhere else: VOO or VTI.
2. ETF vs. mutual fund
ETFs trade throughout the day like stocks. Mutual funds execute at end-of-day NAV. For regular automatic contributions, mutual funds are more convenient since you can invest exact dollar amounts.
3. S&P 500 vs. total market
The S&P 500 covers ~80% of total U.S. market value. Total market funds add mid and small caps. Over most 10–20 year periods, returns have been nearly identical. Either choice is fine.
4. Portability
If there is any chance you will switch brokerages, avoid FZROX and other proprietary zero-fee funds that cannot transfer in-kind. FSKAX, VOO, and VTI can move to any brokerage without selling.
Pros and Cons of Index Funds
Pros
- Ultra-low costs: Expense ratios as low as 0.00% vs. 0.5–1.5% for active funds
- Instant diversification: One fund, hundreds or thousands of stocks
- Market-matching returns: 80%+ of active managers underperform over 15 years
- Tax efficiency: Low turnover means fewer taxable capital gains distributions
- Simplicity: No stock-picking required — buy, hold, repeat
Cons
- Market risk: When the market drops, your fund drops
- No outperformance: You will match the index, never beat it
- Concentration risk: Top 10 S&P 500 stocks are over 30% of the index
- FZROX portability: Zero-fee Fidelity funds cannot transfer to other brokerages
Invest in Index Funds with Schwab — No Minimum, No Commissions
Schwab offers SWPPX (0.02%) and SWTSX (0.03%) with zero minimums and top-rated brokerage tools.
Open Schwab Account →Where to Buy Index Funds in 2026
The best starting point for most people is a Roth IRA (contribute up to $7,000 in 2026 if under 50), then max any 401(k) match, then a taxable brokerage account.
- 401(k) or 403(b): Check your plan lineup for low-cost index options.
- Roth IRA: Open at Fidelity, Schwab, or Vanguard. Contributions grow tax-free.
- Taxable brokerage: ETFs like VOO and VTI are especially tax-efficient here.
- Robo-advisors: Betterment and Wealthfront build portfolios of low-cost index ETFs automatically.
2026 Market Context: Should You Still Buy?
The S&P 500 gained ~18% in 2025 and is up another ~11% through May 2026. Research consistently shows time in the market beats timing the market. The right answer for most investors: invest consistently regardless of market conditions using dollar-cost averaging.
Start Investing Automatically with Betterment — $1 Minimum
Betterment automatically invests in low-cost index ETFs and rebalances your portfolio. Perfect for hands-off investors.
Start with Betterment →Frequently Asked Questions
What is the best index fund for beginners in 2026?
For most beginners, FXAIX (at Fidelity) or VOO (at any broker) are the best starting points. Open a Roth IRA, set up automatic monthly contributions, and do not touch it.
Is VOO better than VTI?
VOO tracks the S&P 500 at 0.03%. VTI tracks the entire U.S. stock market also at 0.03%. Over the past decade, returns have been nearly identical. Both are excellent choices.
How much does a 0.015% vs 0.03% expense ratio matter?
On a $100,000 portfolio growing at 10% annually, the difference compounds to roughly $3,000–$4,000 more over 30 years. Small percentages, big dollars over time.
Can I lose money in an index fund?
Yes. During the 2022 bear market, the S&P 500 fell about 19%. During the 2020 COVID crash, it dropped 34% before recovering. Index funds are best for money you will not need for at least 5–10 years.
Should I put everything in one index fund?
A total market fund like VTI or FZROX gives you the whole U.S. stock market. For broader diversification, add an international index fund (like VXUS) and a bond fund (like BND). The three-fund portfolio is a time-tested approach.
Are index funds safe during a recession?
Index funds will fall during a recession but tend to recover faster than individual stocks due to diversification. Investors who held through recessions and continued contributing consistently came out ahead.