Index Funds vs. Actively Managed Funds: What 20+ Years of Data Reveal About Your Returns

The Shift From Active to Passive Investing

In 2024, a historic milestone reshaped the investment industry: total assets in passive index funds and exchange-traded funds (ETFs) surpassed $16 trillion in the United States, overtaking actively managed funds for the first time ever. This was not a sudden shift—it was the culmination of a decades-long trend driven by mounting evidence that most professional fund managers consistently fail to beat the market after accounting for their fees. The Investment Company Institute (ICI) reported that the industry launched a record 757 new ETFs in 2024, with net share issuance crossing $1 trillion for the first time.[1]

Meanwhile, the stock market delivered three consecutive years of exceptional performance: the S&P 500 returned +26.3% in 2023, +25.0% in 2024, and +17.9% in 2025—capping a stretch that rewarded investors who simply stayed invested in broad market index funds. Two consecutive years of returns exceeding 20% has only happened a handful of times in market history. Yet despite these favorable conditions for stock-picking, Morningstar's 2025 Active/Passive Barometer found that just 38% of active strategies survived and beat their passive counterparts—down from 42% the prior year.[2, 3]

So what does this mean for you as an individual investor? Should you put your money in low-cost index funds and let the market do the work, or pay a premium for active management in hopes of beating the benchmark? This article examines over two decades of rigorous data from S&P Dow Jones Indices, Morningstar, the SEC, and other authoritative sources to help you make an informed decision—and shows how even small differences in fees can compound into hundreds of thousands of dollars over an investing lifetime.

What Are Index Funds and Actively Managed Funds?

The SEC defines an index fund as "a type of mutual fund or exchange-traded fund (ETF) that seeks to track the returns of a market index." A market index—such as the S&P 500, the Russell 2000, or the Wilshire 5000 Total Market Index—is a statistical measure of a section of the stock market. An index fund holds all (or a representative sample) of the securities in that index, aiming to match its performance as closely as possible. Because no team of analysts is actively researching or trading individual stocks, the management costs are minimal.[4]

An actively managed fund, by contrast, employs a professional portfolio manager (or team of managers) who researches companies, analyzes market trends, and makes buy-and-sell decisions with the goal of outperforming a specific benchmark. FINRA explains that investors in mutual funds are choosing among different share classes, with the main differences being "how much you'll pay in expenses and how your investment professional will be paid." Active funds typically charge higher fees to cover the costs of their research teams, trading activity, and portfolio management.[5]

Both index funds and actively managed funds can exist as either mutual funds or ETFs. A Vanguard S&P 500 index mutual fund and a SPDR S&P 500 ETF both track the same index—they simply differ in their legal structure and how they trade. Similarly, ARK Innovation ETF and Fidelity Contrafund are both actively managed but come in different wrappers. The distinction that matters most for long-term performance is not the wrapper—it is whether the fund is passively tracking an index or actively trying to beat one, and what you pay in fees for that choice.

Charles Schwab notes that index funds "provide the benefit of diversification, and they tend to be cost effective and tax efficient." These three advantages—diversification, low cost, and tax efficiency—form the core argument for passive investing. But are they enough to consistently outweigh the potential of skilled active management? Let's look at the data.[6]

The SPIVA Scorecard: Two Decades of Hard Data

The most comprehensive, longest-running study comparing active and passive fund performance is the SPIVA U.S. Scorecard, published semiannually by S&P Dow Jones Indices since 2002. SPIVA stands for "S&P Indices Versus Active," and it measures the percentage of actively managed funds that underperform their corresponding benchmark index. The scorecard accounts for survivorship bias—funds that were liquidated or merged during the measurement period are still counted—making it one of the most methodologically rigorous comparisons available.[7]

The SPIVA U.S. Mid-Year 2025 Scorecard showed that 54% of actively managed large-cap U.S. equity funds underperformed the S&P 500 in the first half of 2025. This was actually an improvement from the full-year 2024 result, where 65% of large-cap funds underperformed. The 2024 underperformance rate placed the industry on track for the best year since 2022. But these short-term numbers obscure a far more important long-term pattern.[7, 8]

Over longer time horizons, the data becomes far more decisive. After deducting fees, at least 80% of actively managed equity funds underperformed their respective benchmarks over a 10-year period. Over 15- and 20-year periods, the underperformance rate climbs to approximately 90%. Apollo Academy summarized it bluntly: "Roughly 90% of active equity fund managers underperform their index." This is not a matter of a few unlucky managers dragging down the average—it is a systemic pattern observed across every fund category, every market cycle, and every geography that SPIVA covers.[9]

One notable exception in the mid-year 2025 data was small- and mid-cap funds. Only 22% of small-cap funds and 25% of mid-cap funds underperformed their benchmarks in the first half of 2025—the best showing for small caps across more than two decades of SPIVA Scorecards. This suggests that in less-efficient corners of the market where stocks receive less analyst coverage, skilled active managers may have more room to find mispriced opportunities. However, even this advantage has historically been eroded over longer measurement periods.[7]

Perhaps the most damning finding comes from the SPIVA Persistence Scorecard, which tracks whether top-performing active funds maintain their rankings over time. The data shows that a fund in the top quartile over one three-year period is no more likely than random chance to remain in the top quartile in the next period. In other words, past performance truly is not a reliable predictor of future results—a finding that undermines the primary argument for selecting active funds based on their track records.[10]

The Fee Factor: How Expense Ratios Compound Over Decades

Every mutual fund and ETF charges an annual fee called the expense ratio, expressed as a percentage of your invested assets. The SEC explains that these annual fund operating expenses "indicate the percentage of net assets used by the fund each year to pay for fees and expenses, including management fees, 12b-1 fees, and other expenses." What might seem like a fraction of a percent can have a massive impact on your wealth over time.[11]

According to the ICI's 2025 research on fund expense trends, the average expense ratio for index equity mutual funds was just 0.05%—meaning for every $10,000 invested, you pay $5 per year in fees. For actively managed equity mutual funds, the average was 0.64%—$64 per year on the same $10,000. That is a 12.8x difference in annual costs. The gap has been narrowing over the decades as competition drives fees down across the board, but it remains substantial.[12]

Here is where compound interest works against you. Consider two investors who each start with $100,000, earn an average gross return of 8% per year over 30 years, and make no additional contributions. The only difference is their fund fees. Investor A uses an index fund charging 0.05% (net return: 7.95%), while Investor B uses an actively managed fund charging 0.64% (net return: 7.36%). After 30 years, Investor A's portfolio grows to approximately $993,000, while Investor B's grows to approximately $842,000. That 0.59 percentage point difference in annual fees resulted in roughly $151,000 less wealth—about 15% of the final portfolio value—simply lost to the compounding drag of higher fees.

The SEC's Investor Bulletin on fees warns that "what might seem initially like a small percentage annual fee can have a large impact over time." FINRA's Fund Analyzer tool lets investors compare the impact of fees across thousands of mutual funds and ETFs—an essential due diligence step before committing your capital. The bottom line: for an actively managed fund to justify its higher fees, it must consistently outperform its index benchmark by at least the fee differential. As the SPIVA data shows, the vast majority fail to do so.[13, 14]

Use our compound interest calculator to model your own scenario: enter your starting balance, expected return rate, and compare what happens with a 0.05% fee versus a 0.64% fee—or any fee your current fund charges. Seeing the dollar impact on your specific situation makes the abstract math concrete.

Morningstar's Active/Passive Barometer: 2025 Results

While the SPIVA Scorecard measures active funds against their benchmark index, Morningstar's Active/Passive Barometer takes a different approach: it compares each active fund against a composite of real, investable passive funds in the same category. This is arguably a more practical comparison because it measures what investors would actually experience by choosing passive alternatives—not just an abstract index that cannot be directly owned.[15]

The 2025 Barometer, spanning over 9,200 unique funds accounting for approximately $26 trillion in assets (about 67% of the U.S. fund market), found that just 38% of active strategies survived and outperformed their average passive peer. This represented a 4-percentage-point decline from the prior year. The results were particularly notable because 2025 offered exactly the kind of volatile market conditions—elections, executive orders, tariffs, and geopolitical risks—that are often cited as environments where active managers should theoretically shine. They did not.[2]

Breaking down the results by category reveals some important nuances. In U.S. large-cap equity—the most popular category for individual investors—active managers showed their weakest rate of success over a 10-year period. Active corporate bond managers saw a 63-percentage-point decline in success rates, falling to just 4.4% in 2025. However, certain categories like real estate and some international equity segments showed relatively better active management results, though "better" still often meant fewer than half of active managers outperformed.[15]

A February 2026 CNBC analysis of the Morningstar data put the findings in context: among active funds, 38% beat their passive peers in 2025 after accounting for fees, down from 42% in 2024. The article quoted financial planners who suggested thinking of active and passive funds as "teammates" rather than "rivals"—a perspective we will explore in the strategy section of this article.[16]

Warren Buffett's Million-Dollar Index Fund Bet

No discussion of index funds versus active management is complete without the most famous wager in investing history. In late 2007, Warren Buffett made a $1 million bet with Ted Seides of Protégé Partners, a hedge fund firm. Buffett wagered that over a ten-year period (January 1, 2008, to December 31, 2017), a simple, low-cost S&P 500 index fund would outperform a hand-picked portfolio of five hedge funds-of-funds—the pinnacle of active management with access to the best talent in the industry.[17]

The result was not even close. Over the decade, the Vanguard S&P 500 index fund delivered a compound annual return of 7.1%. The five hedge fund portfolios averaged just 2.2% per year after all fees, costs, and expenses. The index fund's cumulative gain was 125.8%, compared to 36% for the hedge funds. Protégé Partners conceded before the bet officially ended. Both parties had initially bought a zero-coupon Treasury bond with the proceeds; in 2012, they agreed to sell it and invest in Berkshire Hathaway stock, which more than doubled the prize to $2.27 million—all donated to Girls Inc. of Omaha.[17]

Buffett has been a vocal advocate for index investing throughout his career. In his 2013 annual letter to Berkshire Hathaway shareholders, he disclosed the instructions he left for the trustee managing his wife's inheritance: "Put 10% of the cash in short-term government bonds and 90% in a very low-cost S&P 500 index fund. (I suggest Vanguard's.)" He added that he believed "the trust's long-term results from this policy will be superior to those attained by most investors—whether pension funds, institutions, or individuals—who employ high-fee managers."[18]

Buffett's bet is a powerful illustration of the fee drag and performance shortfall that active management faces. The hedge funds in the bet were not amateur operations—they were selected by a professional fund-of-funds manager with access to elite talent. Yet after layers of fees (the underlying hedge fund fees plus the fund-of-funds layer), the active approach captured less than a third of the index return. For the average individual investor paying far less in active fund fees than hedge fund clients, the results would be better—but the directional lesson remains.

When Active Management May Still Add Value

Despite the overwhelming data favoring index funds, dismissing active management entirely would be an oversimplification. The CFA Institute notes that the investment manager selection process involves contrasting Type I and Type II errors—the risk of rejecting a skilled manager versus the risk of selecting an unskilled one—and that the evaluation must consider investment philosophy, decision-making process, and performance attribution, not just raw returns.[19]

The SPIVA mid-year 2025 data itself revealed areas where active management showed promise. Only 22% of small-cap funds and 25% of mid-cap funds underperformed their benchmarks—meaning 75-78% of active managers in these categories actually beat their index in the first half of 2025. Small- and mid-cap stocks tend to have less analyst coverage, wider bid-ask spreads, and more information asymmetry, which creates opportunities for skilled managers to identify mispriced securities. However, investors should note that these short-term results may not persist, and the long-term SPIVA data for small- and mid-cap is less favorable.[7]

Fixed-income markets present another case where active management can add value. Bond markets have structural inefficiencies—new issue pricing, credit rating changes, and liquidity premiums—that skilled fixed-income managers can potentially exploit. While the Morningstar 2025 data showed that active corporate bond managers struggled (with success rates falling to just 4.4%), other bond categories have historically shown more favorable results for active management, particularly in periods of changing interest rate environments like the one the Federal Reserve has navigated recently.[15]

Tax-loss harvesting is another area where active management—or at least active tax management—can benefit investors in taxable accounts. By strategically selling positions at a loss to offset capital gains, active managers can generate tax alpha that partially or fully offsets their higher fees. Direct indexing, a newer approach, allows investors to own individual stocks in an index and harvest losses at the individual security level while maintaining index-like exposure. The CFP Board has emphasized that strategies such as tax-loss harvesting and Roth IRA conversions can help offset market downturns over the long run.[20]

The FINRA Foundation's 2025 National Financial Capability Study found that investor behaviors and preferences continue to shift, with attitudes toward risk and reliance on financial influencers evolving rapidly. This underscores the importance of basing investment decisions on evidence rather than trends. The data does not say that active management never works—it says that identifying winning active managers in advance is extraordinarily difficult, and that the odds favor passive approaches for most investors, most of the time.[21]

Tax Efficiency: Index Funds vs. Active Funds

Beyond expense ratios, index funds have a structural tax advantage over actively managed funds. Because index funds use a buy-and-hold strategy, they generate far fewer taxable capital gains distributions. Active funds, by contrast, frequently buy and sell securities within the portfolio. Each profitable sale inside the fund creates a capital gain that must be distributed to shareholders—and you owe taxes on those gains even if you did not sell your shares of the fund itself.

For the 2026 tax year, the IRS has updated capital gains tax brackets. Long-term capital gains (on assets held longer than one year) are taxed at preferential rates: 0% for single filers with taxable income up to $49,450 ($98,900 for married couples filing jointly), 15% for income up to $492,300 single ($553,850 MFJ), and 20% above those thresholds. Short-term capital gains on assets held one year or less are taxed as ordinary income at rates ranging from 10% to 37%. High earners may also owe the 3.8% Net Investment Income Tax (NIIT) on top of regular capital gains taxes.[22, 23]

This is where the difference between index and active funds matters most in taxable accounts. An actively managed fund with high portfolio turnover—say 80-100% annually—generates far more short-term capital gains (taxed at up to 37%) than an index fund with turnover of 3-5%. IRS Publication 550 provides the detailed rules on investment income and expenses, including how mutual fund distributions are categorized and taxed. Even when an active fund outperforms its benchmark by a small margin before taxes, the tax drag from frequent trading can erase that advantage entirely.[24]

For this reason, many financial planners recommend a location-based strategy: hold actively managed funds in tax-advantaged accounts (401(k), Traditional IRA, Roth IRA, or HSA) where capital gains distributions are either tax-deferred or tax-free, and use tax-efficient index funds in taxable brokerage accounts. The Tax Foundation's 2026 tax bracket data shows that the standard deduction will rise to $16,100 for single filers and $32,200 for married couples filing jointly, which may influence how investors structure their overall tax planning alongside their fund selection.[23]

The AICPA recommends aligning your tax harvesting strategy with current and projected income levels to make the most of available tax thresholds. Whether you choose index funds, active funds, or a combination, understanding the tax implications of each holding is essential to maximizing your after-tax returns.[25]

How to Build Your Investment Strategy

The evidence is clear: for the majority of investors, a core portfolio of low-cost index funds will produce better long-term results than most actively managed alternatives. But "most" is not "all," and a thoughtful approach can incorporate elements of both. The core-satellite strategy is one popular framework: build your portfolio's foundation (70-90%) with broad-market index funds covering U.S. stocks, international stocks, and bonds, then allocate a smaller satellite portion (10-30%) to active strategies in areas where you believe skilled management can add value—such as small-cap stocks, emerging markets, or specialized bond sectors.

Before selecting any fund—index or active—conduct thorough due diligence. Key factors to evaluate include: (1) Expense ratio: Compare the fund's costs against its category average using FINRA's guidance on fees and commissions. (2) Tracking error: For index funds, how closely does the fund replicate its benchmark? A large tracking error means you are not getting what you are paying for. (3) Tax efficiency: Look at the fund's turnover ratio and historical capital gains distributions, especially for taxable accounts. (4) Fund size: Ensure the fund has sufficient assets under management for liquidity. (5) Manager tenure: For active funds, how long has the current manager been running the fund?[26]

The macroeconomic backdrop also matters for your overall asset allocation. The Federal Reserve cut interest rates three times in 2025, bringing the federal funds rate to a range of 3.50-3.75% by December. In January 2026, the Fed held rates steady, with FOMC participants projecting a gradual decline toward approximately 3.0% in the longer run. This environment of moderating rates affects both stock and bond returns, and is worth considering when you run projections through a compound interest calculator.[27, 28]

The CFPB emphasizes that financial well-being should be the ultimate measure of success for financial education efforts. Whether you choose all index funds, all active funds, or a blend, the most important factor is having a clear plan that you can stick with through market ups and downs. Emotional decisions—panic selling during downturns or chasing performance during rallies—destroy far more wealth than the difference between index and active fund fees. Use our calculator to run your own projections and build confidence in your long-term strategy.[29]

Frequently Asked Questions

Below are the most common questions investors ask when deciding between index funds and actively managed funds. Each answer draws on the research and data discussed throughout this article.