Index Funds vs Active Funds: The 20-Year Study Results Are In

A comprehensive 20-year study covering over 3,000 actively managed mutual funds has concluded that just 14% managed to outperform their benchmark index after fees over the full period. The findings, published by the S&P Dow Jones Indices SPIVA report, reinforce the long-standing case for passive investing.

The results are particularly damning for higher-cost active funds. Among funds with expense ratios above 1% annually, the outperformance rate drops to just 8% over 20 years. Factor in tax efficiency and the practical advantages of index funds become even more pronounced.

What This Means for Investors

For most retail investors, the message is clear: low-cost index funds tracking broad market indices offer the highest probability of long-term wealth accumulation. The average equity index fund now charges just 0.03% to 0.15% annually, compared to 0.75% to 1.5% for actively managed counterparts.

That fee difference, compounded over 20 years on a $100,000 portfolio, can translate to over $80,000 in additional wealth — without any difference in gross returns required.