Active vs Passive Investing: What the Evidence Actually Says

The evidence on active vs passive investing is not close, and it has not been close for a long time. For UK equity investors, the most recent S&P SPIVA Europe scorecard (Year-End 2025, published April 2026) found that 88% of broad UK Equity active funds underperformed their benchmark over the calendar year, and over a full decade roughly 81% failed to beat the index. Add the cost drag of active fees and the fact that almost no fund stays top-quartile for long, and the rational default for most people in most markets is low-cost index funds. The interesting question is not which one wins (the data settles that), but where the small, evidence-backed exceptions actually are. This page works through the numbers without spin.

The short version

Active investing means a fund manager (or you) picks individual holdings, trying to beat a market index after costs. Passive investing means buying a fund that simply tracks an index, holding everything in it, at minimal cost.

The repeated finding, across decades and across data providers, is that the average active fund underperforms its benchmark after fees, and the longer the horizon, the worse active does. That is not an opinion from an index-fund marketing team; it is the conclusion of the UK regulator, of S&P’s independent scorecards, and even of fund houses that run active funds themselves.

Here is the honest nuance most pages skip: this is overwhelmingly true in efficient markets (large-cap UK, US, global equities), partly true in less-efficient corners (smaller companies, emerging markets), and genuinely arguable in some bond areas. So the rational stance is not “passive always, everywhere.” It is “index by default, active only where there is real evidence it earns its keep, and always weigh total cost over decades.”

What the SPIVA scorecards actually show

SPIVA (S&P Indices Versus Active) is the cleanest evidence we have, because it compares active funds to the index they are measured against and corrects for funds that quietly disappear. The SPIVA Europe scorecards from S&P Dow Jones Indices are updated twice a year.

The Year-End 2025 edition (published April 2026) was a bad year for UK active management:

These figures are not interchangeable, and that matters. A lot of UK ranking pages quote a vague “80 to 90% underperform” without saying which year, which time horizon, or whether the funds are priced in pounds or euros. The denomination alone moves the number: in the same Europe scorecards, sterling-denominated and euro-denominated versions of similar categories routinely show different one-year underperformance rates, because the currency in which returns are measured changes the answer. Same study, different numbers, because the question being asked is different. So always read which line you are being quoted.

The pattern that holds across every edition: the longer the period, the higher the share of active funds that fall behind. Over ten years, at least 80% of funds underperformed their benchmark in 17 of the 22 European categories in the latest scorecard. Beating the market in one year can be luck. Beating it for ten is rare.

Why most active managers lose: it is mostly cost

The simplest explanation is arithmetic. Before costs, the average active pound and the average passive pound earn roughly the market return (that is just how averages work). After costs, the active pound is dragged down by a much larger fee.

UK index trackers typically charge an Ongoing Charges Figure (OCF) of about 0.05% to 0.25%. Real examples: Fidelity Index UK at 0.06%, HSBC European Index at 0.05%, iShares Japan Equity Index at 0.08%. Active equity funds typically charge around 0.75% to 1.0%. We explain the metric in full in fund fees and the OCF explained, but the headline is that you are paying roughly ten to twenty times more for active, every year, whether it beats the market or not.

Over a working lifetime, a fee gap that sounds trivial becomes enormous. On a long-run projection, a difference of just under a percentage point a year (say 1.0% active versus 0.15% passive) can erase a fifth or more of your total return through compounding alone. The FCA put a figure on this from the other direction: a 1% difference in ongoing charges can cut a pension pot by roughly 21% over a working life.

Crucially, the fee does not buy you better performance. The FCA’s 2017 Asset Management Market Study found no clear relationship between charges and the gross performance of retail active funds, and a negative relationship between net returns and charges. Higher cost, lower returns, on average. That is the single most important sentence a UK investor can internalise, and it comes from the regulator, not a fund house.

The closet-tracker problem

The FCA found something worse than expensive active funds: expensive funds that were barely active at all. It identified around 109 billion pounds sitting in “partly active” funds that charged fully active fees, including “closet trackers” that hug a benchmark while charging for stock-picking that is not really happening.

The regulator’s intervention resulted in about 34 million pounds in voluntary payments back to investors, a 1.9 million pound fine against one firm, and improved disclosures across the funds it challenged (per the FCA’s closet-trackers page). If you are paying an active fee, the least you should expect is genuinely active management. A fund that closely shadows its index while charging 0.9% gives you index returns minus an active fee. Comparing your fund’s holdings and “active share” against its benchmark is one way to spot this; it is also one of the common investing mistakes that quietly costs people money for years.

“I’ll just pick a top-performing fund” does not work

The standard rebuttal to all this is: fine, most funds lose, but I’ll buy a five-star fund with a great track record. The persistence data is the most underused evidence against that plan.

Top performance almost never persists. S&P’s persistence scorecards show that not a single active US domestic equity fund that was top-quartile in December 2020 remained top-quartile over the following four years, and UK persistence data tells the same story over recent five-year windows. A fund that was in the top 25% has roughly random odds of being there again. Past performance, as every prospectus is legally obliged to say, really is no guide to the future, and the numbers bear that warning out precisely.

There is also a quieter distortion called survivorship bias. The SPIVA Europe data shows that around half of all equity funds were merged or liquidated over a trailing ten-year period, and the ones that get closed tend to be the losers. That means the surviving-fund averages flatter active management; the true failure rate of the original universe is higher than the headline. A current example: Vanguard is permanently closing its own Active UK Equity fund (effective 22 April 2026), saying it had not reached the expected scale and was unlikely to attract new investors. Funds do not just underperform; they disappear, and you cannot buy a track record from a fund that no longer exists.

Where some active investing genuinely earns its place

This is where most pages either pretend active is always pointless (it is not) or oversell it. The evidence supports a narrow, specific case.

Bonds are the strongest case for active

Fixed income is the one major area where the data is closest to even, and sometimes favours active. AJ Bell research found that a majority of active bond strategies beat a representative passive benchmark, although the edge is not enormous and varies by period, so this is “worth considering,” not “active always wins.” The areas most often cited are high-yield and emerging-market debt, where index construction is awkward (bond indices weight by how much an issuer owes, which is not obviously sensible) and a skilled manager has more to work with. The honest version of this point is the one missing from most pages: closer to even odds, not a slam dunk.

Smaller companies and emerging markets: less inefficient than advertised

The “less-efficient markets” argument says active should win where information is scarce. There is a grain of truth and a lot of exaggeration. UK Smaller Companies active funds have tended to underperform at a somewhat lower rate than broad UK equity over a decade, but a clear majority still failed. In global small-cap and emerging markets, the large majority of active managers still underperformed over ten years. So the inefficiency helps at the margin; it does not flip the result.

A narrow UK-equity footnote

Vanguard’s own long-run UK research (cited by Monevator) found that in most asset classes a majority of active funds failed to beat their benchmark, with UK equities a partial exception: the median UK active manager edged ahead by roughly 0.3% a year over a 15-year window. That is a real but tiny edge, easily wiped out by a slightly higher fee, and not a reason to abandon indexing for your UK exposure. It also flatters active by ignoring the funds that closed along the way.

Passive is not free, and not risk-free

“Passive always wins” is itself an overstatement if it ignores the costs that index funds do carry. They incur turnover when stocks enter or leave the index, and when investors buy and sell units; they have tracking error (the small gap between the fund’s return and the index’s); and on some platforms a percentage-based platform fee quietly adds to the headline OCF, so your true cost is OCF plus platform fee. There is also concentration risk: a market-cap index increasingly piles into a handful of mega-cap names, so “the whole market” can be less diversified than it sounds. None of this overturns the case for indexing. It just means you should read the total cost, not only the OCF, and understand what you own. If you are weighing tracker funds against exchange-traded versions, see index funds vs ETFs.

The rational stance for a UK investor

Put together, the evidence points to a calm default rather than a crusade:

• For efficient equity markets (UK large-cap, US, global, developed), use low-cost index funds. The odds against active are roughly 8 or 9 in 10 over a decade, and the cost gap compounds against you for life.
• Reserve active selectively for areas with real evidence: parts of fixed income (high-yield, emerging-market debt), where success is closer to even, not guaranteed. Keep it a minority of the portfolio.
• Judge everything on total cost over decades, OCF plus platform fees, because that is the one variable you control and the one most strongly linked to net returns.
• Do not chase past top performers, and check that anything labelled “active” is not a closet tracker charging an active fee for index-hugging.

For most people building wealth in a Stocks and Shares ISA (with its 20,000 pound annual allowance), the boring answer is the right one: a low-cost, globally diversified index portfolio, held for the long term, with active reserved for the few niches that have earned it. If you are still at the starting line, our guide on how to start investing in the UK walks through the wrapper and platform choices first.

Frequently asked questions

Should I use active or passive funds in my Stocks and Shares ISA? For your core equity holdings, low-cost index funds are the evidence-backed default: the SPIVA data shows roughly 81% of broad UK active funds underperformed over a decade, and the cost gap compounds against you. You might reserve a small slice for active in areas like high-yield or emerging-market bonds, where the odds are closer to even, but there is no need to hold active equity funds to invest well.

Do active funds actually beat the market over the long term? Most do not. SPIVA Europe Year-End 2025 found 88% of broad UK Equity active funds underperformed over one year and around 81% over ten. Once you account for funds that were closed or merged (around half over a decade), the true failure rate of the original universe is even higher.

How much does a 1% fund fee really cost me over 20 or 30 years? A lot. The FCA estimated that a 1% difference in ongoing charges can cut a pension pot by roughly 21% over a working life. The mechanism is compounding: a fee gap of just under a percentage point a year quietly removes a large slice of your final pot, whether or not the fund beats the market.

What is the OCF and what counts as a cheap index fund in the UK? The OCF (Ongoing Charges Figure) is the standard UK measure of a fund’s annual running cost. Cheap UK trackers sit around 0.05% to 0.25%: Fidelity Index UK is about 0.06%, HSBC European Index about 0.05%, iShares Japan Equity Index about 0.08%. Active equity funds typically charge around 0.75% to 1.0%. Remember to add any percentage platform fee to get your true cost.

Is active investing ever worth it, or are index funds always better? It can be worth it in narrow, evidence-backed areas, mainly parts of fixed income such as high-yield and emerging-market debt, where AJ Bell research found a majority of active bond funds beat a representative passive benchmark. For efficient equity markets, index funds are the rational default.

What is a closet tracker and how do I know if my fund is one? A closet tracker is a fund that hugs its benchmark while charging an active fee. The FCA found around 109 billion pounds in “partly active” funds charging fully active fees. Warning signs are a fund whose holdings and sector weights closely mirror the index and a low “active share.” If you are paying an active fee for near-index returns, you are getting the worst of both worlds.

Can I pick a top-performing fund and expect it to keep winning? The persistence evidence says no. Not a single US active domestic equity fund that was top-quartile in December 2020 stayed top-quartile over the next four years, and UK data shows the same lack of persistence. Past top performers have roughly random odds of repeating, which is exactly why prospectuses warn that past performance is no guide to the future.

Is passive investing actually safe, or are there hidden costs and risks? Index funds are low-cost but not cost-free: they carry turnover costs, tracking error, and on some platforms a percentage platform fee on top of the OCF. There is also concentration risk, since cap-weighted indices lean heavily into a few mega-cap names. These are reasons to read the total cost and understand what you own, not reasons to switch to expensive active funds.