Index Tracker vs Active Fund Inside Your Pension: The 30-Year Numbers

Same Pot, Same Market, Different Cost

Imagine two identical £50,000 pension pots on the same platform, both invested broadly in global equities, both experiencing the same 7% gross annual return before fees. The only difference: one is in a low-cost global index tracker (0.15% OCF), the other in an actively managed global equity fund (0.85% OCF).

This isn't a hypothetical about picking a "bad" active fund — it's simply the mathematical cost of a 0.70 percentage point fee gap compounding over three decades, assuming both funds deliver identical gross performance. For the active fund to actually beat the tracker, its manager would need to outperform the index by more than the fee gap, every year, for 30 years running — a very high bar that most active managers fail to clear over long periods.

What the Independent Data Shows

SPIVA (S&P Indices Versus Active) scorecards, published twice yearly, consistently find that a majority of actively managed funds underperform their relevant benchmark index over 10, 15 and 20-year periods, once fees are accounted for. The specific percentage varies by fund category and time period, but the direction of the finding — most active funds lag their benchmark net of fees over long horizons — has held remarkably consistently across market cycles since the data has been tracked.

This doesn't mean no active fund is ever worth its fee. Some managers, in some periods, do outperform meaningfully. But identifying those managers in advance, and staying invested with them through inevitable periods of underperformance, is a different and harder skill than simply choosing a low-cost tracker.

Worked Example: Adding Monthly Contributions

Add £250/month in ongoing contributions to the same starting pots, over 30 years.

With regular contributions layered in, the gap widens to over £101,000 — because every future contribution also grows at the lower net rate inside the active fund.

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Comparing Typical Fund Types

When Active Management Might Still Make Sense

Active management can have a stronger case in less efficient markets — small-cap companies, emerging markets, or specialist sectors — where genuine research and stock-picking skill may have more scope to add value than in large, heavily analysed markets like US or UK large-cap equities. Even so, the fee premium needs to be weighed carefully, and a low-cost tracker remains a reasonable, evidence-based default for the core of most pension portfolios.

Use the

to model your own pot under different fee and growth assumptions, and the to see how any fixed fee difference compounds over your own time horizon.

The Bottom Line

Over the multi-decade timescale of a pension, fee differences between index trackers and active funds compound into very large sums — often tens of thousands of pounds on an ordinary pot. Given the weight of evidence that most active funds fail to overcome their fee drag over long periods, a low-cost global index tracker is a sound, evidence-based core holding for most pension savers, with active funds reserved for specific, considered allocations where you have genuine conviction in the strategy.