Investment Fees: The Cost You Can Actually Control
You cannot control returns. You can control costs, and over thirty years the difference is often larger than any decision about what to buy.
Key points
- Fees compound against you exactly as returns compound for you.
- A 1% annual charge can consume roughly a quarter of a 30-year outcome.
- Platform fees, fund charges, transaction costs and spreads are separate and all real.
- Cost is the only input to future returns you can know in advance.
The fees you pay
| Fee | What it is | Typical |
|---|---|---|
| Ongoing charge (OCF/TER) | The fund's annual running cost | 0.05–1.5 % |
| Platform fee | Charged by the broker for holding the account | 0–0.45 % |
| Dealing commission | Per trade, mainly on shares and ETFs | £0–£12 |
| Bid-offer spread | Gap between buy and sell prices | 0.02–1 % |
| Transaction costs within the fund | The fund's own trading, not in the OCF | 0.01–0.5 % |
| Foreign exchange | On overseas holdings | 0.15–1.5 % |
| Adviser fee | If you use one | 0.5–1 % |
| Performance fee | A share of gains above a benchmark | 10–20 % of outperformance |
| Exit or transfer fee | Charged to leave | £0–£25 per holding |
The ongoing charge is the one that gets advertised. Several of the others are not, and transaction costs within a fund sit outside the headline figure entirely — they are disclosed separately and rarely read.
What a percentage point costs
On £50,000 invested for 30 years at 7 % gross, with no further contributions:
| Total annual cost | Final value | Lost to fees |
|---|---|---|
| 0.15 % | £364,000 | £16,000 |
| 0.50 % | £330,000 | £50,000 |
| 1.00 % | £287,000 | £93,000 |
| 1.50 % | £249,000 | £131,000 |
| 2.00 % | £217,000 | £163,000 |
The reason the damage exceeds the arithmetic sum of the fees is that each pound taken in charges also forfeits every pound of growth it would have generated. A 2 % annual charge does not cost 2 % of the outcome — over thirty years it costs roughly 45 % of it.
This is the strongest practical argument for low-cost index funds. It does not rely on any claim about markets being efficient; it relies only on arithmetic.
Percentage or flat fee
Platforms charge in two ways, and which is cheaper depends entirely on portfolio size:
- Percentage-based platforms charge, say, 0.25 % a year. Cheap on small portfolios, expensive on large ones — 0.25 % on £500,000 is £1,250 a year for the same service.
- Flat-fee platforms charge a fixed annual amount. Expensive on small portfolios, very cheap on large ones.
The crossover is usually somewhere between £50,000 and £100,000, depending on the specific charges. Many investors start on a percentage platform and never revisit it, which quietly becomes expensive as the portfolio grows. It is worth recalculating every few years.
Watch for fee caps too — some percentage platforms cap the charge on shares and ETFs but not on funds, which can make the choice of investment vehicle affect the platform cost.
When higher fees are justified
Not all costs are waste. Paying more is defensible when it buys something you actually need:
- Regulated financial advice for a complex situation — a pension transfer, inheritance tax planning, a business sale. The cost of getting these wrong exceeds any fee.
- Access you cannot get otherwise, though this is rarer than marketing suggests.
- A service that stops you making an expensive behavioural mistake. If an adviser prevents you selling at the bottom once, the fee may have paid for itself several times.
What is generally not worth paying for: active management of a mainstream equity market, where the evidence on persistent outperformance is weak; performance fees on funds that also charge a full ongoing charge; and layered structures where a fund of funds charges on top of the underlying funds' own charges.
Ask for the total. When comparing options, ask what the all-in annual cost is as a percentage, including platform, fund, transaction and advice charges. Anyone unwilling to give a straight answer has told you something useful.
Frequently asked questions
What is a reasonable total cost?
For a self-managed portfolio of index funds, 0.2–0.4 % all-in is achievable in most markets. Above roughly 1 % without advice, it is worth asking what you are getting for it.
Are fees deducted from my account?
Fund charges are taken from the fund's assets, so they reduce the unit price rather than appearing as a transaction. This is precisely why they are easy to ignore. Platform fees are usually charged visibly.
Is it worth switching platforms to save fees?
Often, for larger portfolios. Weigh the annual saving against any exit fees and the time out of the market during transfer. An in-specie transfer, which moves holdings without selling, avoids the latter.