Fees: the only number you control

You cannot control what markets do. You cannot control the economy, interest rates or whether the next decade is a good one. There is exactly one input you control completely, and it is what you pay to participate.

This guide walks through every charge that can sit between you and your returns, and takes an honest look at which ones actually matter.

Why fractions of a percent are not small

The instinct is that the difference between paying 0.2% and 1.2% is trivially small. It is one percentage point. It sounds like a rounding error.

It is not, for the same reason compounding works: the fee comes off every year, and the money it removes would itself have grown. You are not paying a percentage of this year's money. You are paying a percentage of every future year that money would have produced.

£200 a month for 30 years, same 5% before charges, three different charge levels. Arithmetic, not a forecast.

Same market, same contributions, same length of time. The only difference is the charge. Nothing in investing offers a more reliable improvement than paying less, because it is the only part of the outcome that does not depend on being right about anything.

That table is arithmetic, not a forecast. It assumes a steady rate every year, which no real market has ever delivered. It is there to show how a fee compounds, not to suggest what any investment will return.

The charges, in order of how much they matter

The fund's own charge

Usually shown as the OCF — ongoing charges figure — and expressed as a yearly percentage. This covers running the fund. It is not billed to you; it is taken from inside the fund, quietly, which is precisely why it goes unnoticed.

This is normally the largest recurring cost and the one with the widest range. Trackers sit at the low end because they need almost nobody to run them. Actively managed funds sit far higher because they employ people to make decisions.

The platform fee

What the service holding your investments charges for holding them. Usually either a percentage of your holdings or a flat annual amount.

Which structure is cheaper depends entirely on how much you have, and the crossover is worth working out with a calculator rather than assuming. A percentage fee is gentler on a small pot and can become the dominant cost on a large one; a flat fee behaves the other way round.

Trading costs

A charge each time you buy or sell. Often zero for traditional funds and a fixed amount for ETFs and shares.

This one is mostly under your control through behaviour rather than selection. Someone investing monthly pays it twelve times a year; someone trading weekly pays it fifty-two times, and on smaller amounts each time, so the percentage bite is worse. Frequent trading is expensive twice over — the fees, and the decisions.

The spread

At any moment there are two prices: what you can buy at, and the slightly lower price you could sell at. The gap is the spread, and crossing it is a real cost even though it never appears on a statement.

On large, heavily traded funds the spread is usually very small. On obscure or thinly traded ones it can be wide enough to matter, and it widens further when markets are turbulent — which is exactly when panicked people trade.

Currency conversion

If you buy something priced in another currency, someone converts your money and takes a cut for doing it. This can be surprisingly expensive and is frequently invisible, buried in the exchange rate rather than listed as a charge.

The costs inside the fund that the OCF misses

A subtlety worth knowing: the ongoing charge does not include everything. When a fund buys and sells the companies it holds, it pays trading costs and taxes, and those come out of the fund on top of the stated OCF.

For a tracker holding a stable list, this is usually tiny — it only trades when the list changes. For a fund that turns over its holdings frequently, it can be a meaningful additional drag that never appears in the headline number. Funds publish these separately as transaction costs, and comparing two funds on OCF alone quietly favours the one that trades more.

Exit and transfer charges

Some platforms charge to move your investments elsewhere, occasionally per holding, which on a portfolio of many lines can add up to a genuinely obstructive sum. It is worth knowing before you need it, since a fee you only discover when leaving is a fee designed to stop you leaving.

Why fees are so easy to ignore

There is a structural reason people who scrutinise a supermarket receipt will overpay several-fold on their investments without noticing, and it is worth understanding because it is the thing working against you.

You never write a cheque for a fund charge. It is deducted inside the fund, before the price you see is calculated, so the number on your screen is always net of it. There is no moment of payment, no line item, nothing to react to. The cost is real and completely invisible.

Platform fees are usually more visible but often small enough in any single month to shrug at, which is a different way of achieving the same result. And the compounding effect — the part that actually matters — is by definition never observable, because you cannot see the version of your portfolio that did not pay it.

That is why an explicit audit, once, in pounds rather than percentages, is worth more than good intentions. You are trying to make a number visible that the entire structure is designed to keep out of view.

Percentage or flat: find your crossover

The most common practical question is which platform structure costs less, and it has an arithmetic answer rather than a general one.

A percentage fee scales with your pot. A flat fee does not. So there is always a crossover point, and it is worth two minutes with a calculator: divide the flat annual fee by the percentage rate. Below that pot size the percentage wins; above it the flat fee wins, and the gap widens the further you go.

A worked example, with made-up numbers purely to show the method: a flat fee of £120 a year against a percentage fee of 0.25% crosses over at £48,000. Under that, the percentage is cheaper. Over it, the flat fee is — and at £200,000 the percentage option would be costing £500 against £120 for identical service.

Run it with your own platform's actual numbers rather than these. The point is the method, not the figures.

How to audit what you are actually paying

Almost nobody has done this. It takes about twenty minutes, and the total is frequently a surprise.

• List every account you hold investments in, including old workplace pensions you have not looked at in years. Forgotten pensions are where expensive legacy charges go to hide.
• For each, find the platform or provider charge and its structure.
• For each fund inside, find the OCF, and the separate transaction costs if published.
• Add the percentages that apply to the same money, then apply the total to your actual balance to get a figure in pounds. A percentage is easy to shrug at. A number with a currency sign in front of it is harder to ignore.
• Compare that annual figure against what an equivalent low-cost arrangement would cost, and use the arithmetic above to see what the difference compounds to over the years you have left.

What a higher fee is meant to buy

In fairness to the expensive end of the market, it is worth asking what the extra is supposed to be for, because sometimes there is a real answer.

• Research and judgement — people paid to decide what to hold. Whether that is worth the fee is the argument covered in the previous guide, and the evidence is not kind to it in mainstream markets.
• Access to something you could not otherwise buy — genuinely specialised areas where no cheap tracker exists. Rarer than the marketing implies, but real.
• Advice — a regulated adviser looking at your whole situation, which is a service, not a fund charge, and should be priced and judged separately from the investments themselves.
• Administration and hand-holding — some people pay for a simpler experience and value it. That is a legitimate choice as long as it is a choice.

The problem is not that these have no value. It is that a great many people pay active-management prices for something behaving very like a tracker, receiving none of the above. That is the specific situation worth checking for, and the audit above is how you find out.

The question to ask of any charge is simply: what am I getting for this, and could I get the same thing for less? If there is a clear answer you are happy with, the fee is fine. If there is not, you have found the single most improvable part of your arrangement.

Cheapest is not automatically best

It would be a poor guide that told you to sort by price and buy the top row, so here is the honest qualification.

A platform that fails you at the wrong moment, holds your money badly, or offers no way to reach a human when something has gone wrong is not a bargain. Regulatory protections, the practicalities of getting your money out, and whether an account type you need is even offered all matter more than a few basis points.

And moving purely to save a small amount can cost more than it saves once transfer fees and time out of the market are counted. The useful version of this guide is not "always pick the cheapest". It is "know what you pay, and do not pay several times the going rate for something identical" — which is the situation a surprising number of people are in without knowing it.

The cost nobody puts on a statement

There is one more, and for many beginners it dwarfs all of the above: the cost of your own decisions.

Selling in a bad month and buying back once things feel calmer again is not free. It is a cost, and it is usually a large one, because it converts a temporary drop into a permanent one and then charges you fees for the privilege. No fee comparison table captures it, and it is the reason the guide on risk exists.

Tax wrappers, briefly and carefully

In the UK there are account types that shelter investments from certain taxes — ISAs and pensions being the two most people encounter. The details of allowances, limits and rules change with some regularity, which is exactly why no figures appear here.

The general shape worth knowing: using a sheltered account where one is available is normally more efficient than not, and pensions and ISAs trade off differently on when you get the tax advantage and when you can access the money. The specifics depend on your circumstances, they change, and this is the point at which a properly qualified adviser earns their fee.

What to actually do with this

• Find out what you are currently paying, in total. Most people have never added it up, and the number is often a surprise.
• Compare like with like. A cheap fund tracking one thing and an expensive fund tracking something else are not competing on price.
• Check the platform structure against the size of your pot, not against a general recommendation.
• Trade less. It is the only fee reduction that also improves your decisions.

None of this requires a forecast, a view or any skill whatsoever. That is what makes it the most reliable improvement available.