Go to any UK investment platform and you’ll be offered two broad types of fund. Active funds, where a manager picks investments with the aim of beating the market. And passive funds — usually called trackers or index funds — which simply mirror an index and don’t try to beat anything.
The active fund will charge you somewhere between 0.6% and 1.5% per year. The passive fund will charge you somewhere between 0.05% and 0.25%. That’s the headline difference in the active vs passive funds debate, and it’s where most articles on this topic stop.
But the headline number doesn’t really explain what you’re buying — or, more accurately, what you’re paying for. The fee difference between active and passive isn’t really about cost. It’s about what you’re betting on. And once you understand that, the choice becomes much clearer.
What the active fee is buying
When you pay 1% a year for an actively managed fund, you’re not paying for the privilege of holding shares. You’re paying for the manager’s judgment.
Specifically, you’re paying for:
- A team of analysts to research companies, sectors, and economies.
- A portfolio manager (or several) to make buying and selling decisions.
- A research budget — meeting company management, attending conferences, subscribing to data services.
- The infrastructure of the fund management firm — risk teams, compliance, marketing, distribution.
- A profit margin for the firm itself.
In return, the manager aims to try to beat the market. Try is the operative word. There’s no guarantee, and no fund manager will give you one. The proposition is essentially: “Pay us 1% a year, and we’ll do our best to deliver more than 1% of extra return above the index, after fees.”
If they succeed, you win. If they fail, you’ve paid 1% for nothing — and worse, that 1% has compounded against your portfolio for as long as you held the fund.
What the passive fee is buying
When you pay 0.15% a year for a passive fund, you’re paying for something much narrower: the operational cost of running a fund that owns the same shares as a published index, in the same proportions.
That’s it. There’s no judgment involved. There’s no team trying to beat anything. The fund just owns what the index says it owns, and rebalances when the index rebalances. Essentially, you’re paying for:
- The administrative cost of buying and selling shares as money flows in and out of the fund.
- Custody and accounting.
- Regulatory compliance.
- A small profit margin for the provider.
Because the work is largely automated and benefits hugely from scale, the cost can be extraordinarily low. The world’s largest passive providers (Vanguard, BlackRock’s iShares, State Street, HSBC, Fidelity) compete aggressively on price, and the fees on basic global index funds have fallen consistently for two decades.
Active vs passive funds: the honest question
The fundamental question, when you’re choosing between active vs passive funds, isn’t “which has lower fees?” It’s “is the manager’s judgment, on average and over the long run, worth what they’re charging?”
The data on this is unusually clear, and unusually consistent.
The S&P SPIVA reports — which track active fund performance against benchmarks across markets and timeframes — have produced essentially the same finding for the past two decades. Over a 10-year horizon, somewhere between 70% and 90% of actively managed UK equity funds underperform their benchmark index. Over 20 years, the proportion is even higher.
Translated into plain English: most active fund managers, most of the time, fail to deliver enough extra performance to justify their fees.
This isn’t a controversial claim within finance. It’s been studied for so long, by so many people, with such consistent results, that even the active fund management industry mostly accepts it. They tend to argue, instead, that some managers can outperform — and that the trick is identifying them in advance.
That’s a much harder claim to support.
The “skill vs luck” problem
In any year, by simple chance, roughly half of active funds will outperform their benchmark and half will underperform. Some will outperform by a lot. Some will underperform by a lot. This happens before you assess any fund manager’s actual skill — it’s just statistical noise.
The challenge is that fund manager skill (if it exists) is almost impossible to disentangle from luck over short periods. A manager who beats the market for three years running might be exceptionally skilled, or they might just have had three good rolls of the dice. You can’t tell from the outside, and often the manager themselves can’t tell either.
Worse, performance tables look much more convincing than they should. The funds that show up at the top of “best 10-year returns” league tables are almost always a mix of:
- A few genuinely skilled managers (rare but real).
- A larger number of lucky managers whose strategies happened to suit the market conditions of that decade.
- A larger number still of strategies that look good now because the funds that pursued similar strategies and lost have already been quietly closed down (the survivorship bias problem).
The honest forecasting record of “this fund will be in the top quartile over the next decade” is poor. Past performance, as the regulatory disclaimer puts it, is not a reliable indicator of future results — and that’s not boilerplate, it’s a literal description of the data.
The maths of compounding fees
The case for passive isn’t just about average performance. It’s also about what fees do over decades.
A 0.85% difference in annual fees doesn’t sound like much. Compounded over 30 years on a typical contribution profile, it can easily reduce your final pot by 20–25%. That’s not 0.85% × 30. It’s far more — because the money lost to fees is itself lost the growth it would have produced.
Active funds need to outperform the index by their fee differential, every year, for decades, just to break even with a passive equivalent. A handful of managers manage this. Most don’t. And you don’t get to know in advance which group your chosen manager will fall into.
When active funds might actually make sense
This isn’t to say active funds are universally pointless. There are specific situations where they have a defensible role.
Inefficient markets. Some corners of the market are less well-researched than the FTSE 100 — small-cap UK shares, frontier emerging markets, certain bond markets, specialist areas like infrastructure or property. In these areas, a skilled active manager has more to work with, and the case for active management is stronger. The same is much harder to make in major liquid stock markets, where the index already reflects an enormous amount of professional analysis.
Genuine specialist skill. A small number of fund management firms have demonstrated long-term, structurally consistent outperformance — Baillie Gifford in growth investing, Fundsmith under Terry Smith, a handful of others. Whether they’ll continue to do so is uncertain (they’re as subject to regression to the mean as anyone), but the cases aren’t crazy.
Specific objectives an index doesn’t address. ESG-screened funds, religious-compliance funds (Sharia, for instance), absolute-return mandates that aim to make money regardless of market direction — these can require active management because no index does what they’re trying to do.
You enjoy it. Some people genuinely find investing interesting and want to take views on managers. That’s a legitimate hobby choice, as long as it’s a small slice of your portfolio rather than the whole thing.
The middle path: a core-and-satellite approach
A reasonable compromise, used by a lot of thoughtful investors, is a core-and-satellite portfolio.
The “core” — usually 70–90% of the portfolio — is held in low-cost passive funds. A global equity tracker, perhaps a bond tracker if appropriate. This is the part that does the long-term compounding work, with rock-bottom fees.
The “satellite” — the remaining 10–30% — can be active funds, individual stocks, or specific themes that the investor has thought about and has a view on. If the satellite outperforms, great. If it doesn’t, the damage is limited because most of the portfolio is in the cheap, diversified core.
This approach lets you have a bit of fun (or express conviction) without putting your retirement at risk if your active picks turn out badly.
What to actually do
For most UK investors most of the time, the practical conclusion is:
- Default to passive funds for the majority of your portfolio. A global equity index fund with an OCF under 0.25% is almost always the right starting point.
- If you choose to use active funds, be deliberate about it. Pick them for specific reasons, in specific areas where the case is strong — not because a glossy advert suggested them or because they topped a recent league table.
- Watch the all-in cost, not just the fund’s fee. A 0.15% tracker on a 0.45% platform with no trading fees might cost the same as a 0.6% active fund on a free platform, depending on portfolio size. Add it up properly.
- Don’t chase last year’s winner. The funds at the top of league tables today are statistically unlikely to be there in ten years. Picking funds based on recent past performance is one of the most reliably destructive habits in private investing.
The fee difference in the active vs passive funds debate isn’t really about cost — it’s about whether you’re paying someone to try to beat the market, and whether you have any reason to believe they’ll succeed. For most ordinary investors, with no special information and no privileged access, the honest answer is: probably not.
Pay 0.15% to capture the market. Spend the saved 1% on something more useful, like more contributions.
This article is for information and education only and does not constitute financial advice. Investments can fall as well as rise in value and you may get back less than you invest. Past performance is not a reliable indicator of future results.