For decades, the debate between active and passive management has divided investors, advisers, and financial media. On one side, active fund managers argue that their expertise, research, and privileged access to information allow them to outperform the market. On the other, advocates of indexing maintain that consistently beating the market is practically impossible, and that trying to do so comes with a cost the investor ends up bearing. The data have been stubbornly tilting towards the second camp for years, even though the first remains the most visible and most heavily marketed.

Two ways of thinking about investing

An actively managed fund is an investment vehicle where a team of analysts and portfolio managers makes decisions about which assets to buy and sell, with the explicit objective of obtaining a return superior to their benchmark index. To do so, they carry out fundamental analysis of companies, monitor macroeconomic indicators, identify trends, and adjust the portfolio frequently. This service has a price: management fees typically range between 0.8% and 2.5% per year on the invested capital, plus the fund’s ongoing expenses.

An index fund or passively managed fund, by contrast, simply replicates the composition of a stock market index — the S&P 500, MSCI World, or Euro Stoxx 50, for example. There is no analysis team selecting stocks or making discretionary decisions about when to buy or sell. The fund follows the index with a much lower cost structure: fees that in many cases range between 0.05% and 0.20% per year.

The promise of active management is straightforward: a skilled professional with resources should be able to identify opportunities the market has not yet priced in and avoid steep losses. The question is whether that happens in practice with sufficient consistency to justify the cost.

What the data say about returns

The most cited source in this debate is the SPIVA report (S&P Indices Versus Active), published by S&P Global semi-annually since 2002. Its findings are consistent year after year: the majority of actively managed funds do not outperform their benchmark index over any relevant time horizon.

In the US equity market, approximately 90% of active funds fail to beat the S&P 500 over a 15-year period. In Europe, the figures are similar: between 80% and 90% of European equity funds underperform their benchmark index over the long term. And these are only the funds that survive: the SPIVA analysis accounts for survivorship bias by excluding funds that were closed or merged during the period — which tend to be precisely those with the worst performance. Without that adjustment, the figures would be even less favourable to active management.

What makes this result particularly significant is that it does not distinguish between bull and bear markets. The data show that active management does not consistently outperform the index even during periods of higher volatility, which is precisely when its advocates argue it adds the most value by protecting against losses.

There are managers who consistently outperform their index over extended periods. The problem is that identifying those managers in advance is extraordinarily difficult, and their past track record does not reliably predict future performance. Numerous studies show that funds leading the performance rankings in one period tend to revert to the mean or fall below it in the following period.

The silent impact of fees

Fees are the factor that most distorts the comparison between active and index funds, and they tend to be underestimated because they are expressed as annual percentages that look small on paper. But over long horizons, their compounding effect is devastating for net returns.

A concrete example: a €10,000 investment over 30 years with a gross annual return of 7% produces, with a fee of 0.15% (index fund), a final portfolio of approximately €74,000. With a fee of 1.5% (a typical low-cost active fund), the final portfolio falls to around €57,000. The difference — more than €17,000 — comes exclusively from the management cost, without even considering whether the active fund outperformed the index before fees.

If the active fund also fails to outperform the index before fees — which happens in most cases — the gap widens further. The investor pays more and receives less.

Beyond management fees, there are other costs that are often less visible: custody charges, portfolio turnover costs (the buys and sells the manager makes generate transaction costs that are deducted from the fund), auditing expenses, and in some cases performance fees triggered when the fund exceeds a certain threshold. All of this is deducted from the investor’s return without appearing transparently in the fund’s marketing materials.

The general rule: the higher the total annual cost, the harder it becomes for the manager to outperform the index after fees, even if they outperform before fees. The starting gap between a 1.5% and a 0.15% fee is 1.35 percentage points per year. Beating the market by more than that, consistently and over decades, is statistically extraordinary.

When active management might make sense

The evidence does not rule out active management in every context. There are situations where it can add genuine value:

Less efficient markets. In emerging markets, small-cap segments, or alternative assets, information is less widely distributed and more specialised analysts may be able to identify real inefficiencies that the market has not yet priced in. In these segments, active management has more room to generate alpha.

Capital preservation strategies. Some flexible or absolute return funds do not aim to outperform an equity index but to protect capital during severe market declines. Their logic and function are not the same as those of a pure index fund, and a direct comparison is not always fair.

Specific risk management and constraints. In large portfolios or those with particular conditions — tax, ethical, or regulatory — active management may be necessary to adapt to those requirements. An investor who cannot hold certain sectors for ethical or regulatory reasons has fewer options within standard indices.

For the individual investor with a long horizon and no special constraints, however, the data point clearly to passive management as the rational starting point.

How to get started with index funds

The most direct way to access passive management is through ETFs (Exchange Traded Funds) or traditional index funds. ETFs replicate indices and trade on stock exchanges like shares, with the advantage of being buyable and sellable throughout the trading day. Traditional index funds work with daily subscriptions and redemptions at net asset value, like any conventional investment fund.

For a long-term profile, the most commonly used options are those that replicate broad global indices, such as the MSCI World — which includes thousands of companies from developed countries — or the FTSE All World, which also adds emerging markets. Either provides geographic and sectoral diversification through a single position at minimal cost.

Some practical considerations for getting started:

  • Low-cost global index ETFs and funds are available through most online brokers in the UK and Europe, with providers such as Vanguard, iShares (BlackRock), or Amundi offering competitive options.
  • The difference in tax treatment between ETFs and traditional index funds varies by country and personal circumstances and is worth checking before choosing a wrapper.
  • Investing fixed amounts at regular intervals — contributing the same sum each month regardless of market conditions — reduces the risk of investing everything at the worst possible moment and simplifies decision-making over time.

Index investing does not require constant monitoring or frequent decisions. That is also part of its advantage: it reduces the temptation to act on impulse during periods of volatility, which is one of the most costly mistakes individual investors make and one of the biggest destroyers of long-term returns.