Here's the answer, and it's bigger than you think. Put £100,000 to work for 30 years at the S&P 500's long-run average of about 10% a year and it grows to roughly £1,745,000. Run the same money through an adviser charging 1.5% a year and you finish with about £1,109,000.
The fee cost you £636,000. More than a third of everything your money would have made.
And here's the part nobody shows you. Over those 30 years, the fees you were actually charged — the amounts that left your account — add up to about £199,000. The other £437,000 is growth those fees would have earned if they'd stayed invested for you.
The fee appears on your statement. Most of the damage never does.
How can 1.5% cost a third of my pot?
Two mechanics do the work, and neither is obvious when you sign up.
First, the fee is charged on your whole pot, not on what the adviser makes you. Up year, down year, it comes out regardless — and as your pot grows, so does the fee. The 1.5% that was £1,500 a year at the start is £16,000 a year by the end. Same service, ten times the price.
Second, every pound taken in fees stops compounding for you, permanently. A pound taken in year one isn't a pound — it's the £17 that pound would have become by year 30. That's why the damage runs to three times the invoices. Fees don't reduce your returns once; they reduce them every year, forever.
What does the gap look like over time?
Same £100,000, same 10% average, year by year:
After | Without the fee | With the 1.5% fee | The gap |
|---|---|---|---|
10 years | £259,000 | £223,000 | £36,000 |
20 years | £673,000 | £497,000 | £175,000 |
30 years | £1,745,000 | £1,109,000 | £636,000 |
Look at how the gap grows. In the first decade it's £36,000 — painful, survivable. In the last decade it's nearly half a million. Compounding is doing exactly what it always does; it's just doing it for someone else.
Averages aren't guarantees, so the sensitivity check: at a more cautious 7% a year, the same fee still costs about £277,000 of a £761,000 outcome. The percentages barely move. If anything the fee takes a bigger share of your gains when markets are ordinary — the drag is fixed, the growth isn't.
Is 1.5% even realistic?
If anything it's kind. The typical all-in cost of an advised portfolio in the UK — advice fee, platform fee, fund fees stacked together — runs 1.5% to 2%. St James's Place's own worked example is 1.67% a year for a pension. Running the same money yourself, on a flat-fee platform with a low-cost index fund, comes in around 0.25%.
That's the comparison that matters: not 1.5% versus zero, but 1.5% versus a quarter of one percent for holding substantially the same investments.
What should I do about it?
Start by finding out what you're actually paying — the all-in number, advice plus platform plus funds, in pounds. It's on your annual statement, usually in the politest possible font.
Then ask the only question that matters: what am I getting for it that's worth a third of my future gains? For some people — genuinely complex affairs, a defined benefit pension, a known tendency to panic-sell — the honest answer might be plenty. For most people, it isn't, and the move to doing it yourself is two forms and a few weeks of admin.
£636,000 is a strange thing to pay for an annual meeting and a nice brochure. Most people just never see the bill in one place.
This is what I write about every week — managing your own money in plain English, without paying someone 1–2% a year to do it worse. The letter is free.
I am not a financial adviser. Nothing here is personal financial advice. This is my own experience and opinion, shared for information and education. The figures above are illustrations at assumed growth rates, not forecasts. Investing involves risk and you can lose money. Please do your own research before acting.