Top 10 Best Index Funds for Long-Term Investors in 2026

VOO offers simplicity and reliability by tracking the 500 largest US companies, which represent about 80% of total US market value, with Warren Buffett endorsing it for 90% of his estate. Its expense ratio of 0.03% is identical to #1 VTI, and the S&P 500 has returned an average of 10.2% annually since 1957 including dividends. As the world's largest ETF with over $600 billion in assets as of 2026, it slightly trails VTI in diversification but leads in brand trust and liquidity by a 50% higher trading volume on average.

URTH provides essential international diversification by tracking the MSCI World Index covering 23 developed markets and roughly 1,600 companies, with a geographic breakdown of 70% US, 10% Japan, and 5% UK. Its expense ratio of 0.24% is higher than #1 VTI's 0.03% but justified for global access, and Morningstar rates it five stars. Historical data shows the MSCI World outperformed the S&P 500 by an average 1.5% annually from 2000 to 2009, and long-term investors can benefit from multi-decade periods where international exposure reduces volatility despite the 0.21% fee premium over domestic funds.

FZROX is the only major broad market index fund with a 0.00% expense ratio, eliminating all fees and maximizing net returns for Fidelity investors. Since launching in 2018, it tracks a proprietary Fidelity index and mirrors #1 VTI's performance within 0.01% over 5 years, proving zero fees come without sacrificing returns. However, it is restricted to Fidelity accounts only, unlike #1 VTI's portability, making it best for dedicated Fidelity users who save $30 per $100k invested annually compared to VTI's 0.03% expense ratio.

BND establishes the definitive bond market pillar for retirement-focused investors, holding over 10,000 US investment-grade bonds across Treasuries, corporates, and mortgage-backed securities. Its 0.03% expense ratio is the cheapest among the top 10, undercutting the average of 0.08% for similar funds and is 60% lower than the typical rival. As the anchor of the classic 60/40 portfolio, it has generated approximately 8.7% average annual returns over 50 years with lower volatility than 100% equity portfolios. During the 2022 rate hike cycle, however, BND fell 13%, underscoring interest rate risk. This makes it best for investors within 10 to 15 years of retirement seeking a stable income stream, outperforming equity-heavy options like VWO in risk reduction by reducing drawdowns by roughly 25%.

VWO delivers unmatched exposure to the fastest-growing economies, including China, India, Brazil, Taiwan, and South Korea, which collectively house 85% of global population. India's weight in the index has surged from 8% to 22% since 2020, reflecting shifting growth dynamics. With a 0.08% expense ratio, it is slightly more expensive than BND but still competitive, though 30% costlier than SCHD's 0.06%. The IMF projects emerging markets will account for 65% of global GDP growth through 2030, yet VWO's volatility is significantly higher than SCHD's—making it a riskier play with a standard deviation 20% above the category average. A 10% to 15% allocation is commonly recommended. Best for patient investors with 15-plus year horizons who can tolerate higher volatility for potentially greater returns.

SCHD combines dividend income with long-term growth, screening 100 US stocks for dividend consistency, cash flow to debt, return on equity, and yield. Its 0.06% expense ratio is lower than VWO's 0.08%. Since inception in 2011, it has outperformed the S&P 500 in risk-adjusted terms, boasting a Sharpe ratio of 0.87 versus 0.76 for VOO—a 14% improvement. Current yield as of 2026 is approximately 3.5%, nearly triple the S&P 500 average of 1.3%, yet its growth potential trails VWO's emerging-market exposure by an estimated 2% annually. SCHD dividends are qualified and tax-efficient. Best for investors seeking income combined with long-term growth.

USRT provides diversified real estate exposure across residential, commercial, healthcare, and industrial properties via REITs, with a 0.08% expense ratio equal to VWO's. REITs must distribute 90% of taxable income as dividends, yielding approximately 3.8% in 2026, slightly above SCHD's 3.5% by 0.3 percentage points. Historically, real estate offers returns between bonds and equities with low correlation to both, making it an effective portfolio diversifier that reduces volatility compared to equity-only funds like VWO by roughly 15% over a 20-year horizon. However, REIT dividends are typically ordinary income, making this more suitable for tax-advantaged accounts. Best for diversifying long-term portfolios.

VXUS is the cheapest core international holding, with a 0.07% expense ratio covering over 7,600 non-US stocks from developed and emerging markets. This cost outperforms #2's typical target-date blend by 50%. With US stocks trading at P/E ratios 30–50% above equivalent European and Asian firms, VXUS positions investors for secular mean reversion. A 60/40 VTI-to-VXUS split mirrors global cap weights, offering true world ownership.

Vanguard Target Retirement Funds offer a 0.08% expense ratio and an automatic stock-to-bond glide path, a cost 30% lower than the typical target-date rival. By removing behavioral errors that cost average investors 1–2% annually in market-timing losses, this Morningstar Gold-rated series outperforms #10's manually allocated alternatives in simplicity. Best for hands-off investors seeking a single lifelong holding.