What a Total Expense Ratio Really Leaves Out

When you look at a fund fact sheet, the total expense ratio (TER) is usually the first cost you see. It is a single percentage that seems to sum up what you pay for the privilege of owning that fund. But the TER does not cover everything. In fact, some of the most significant costs you will face are quietly left out. This article explains what the TER includes, what it misses, and how to avoid being caught out by the difference.

What the total expense ratio actually measures

The total expense ratio, or TER, is a measure of the ongoing annual costs of running a fund. It is expressed as a percentage of the fund’s total assets. If a fund has a TER of 0.75%, you pay £7.50 each year for every £1,000 you have invested. That sounds straightforward, and for many beginners it is the only number they check. But the TER is not a complete bill. It is more like a landlord’s advertised rent that excludes service charges, ground rent, and council tax. You still pay those, but they are listed somewhere else.

Understanding what the TER includes and what it leaves out matters because the missing costs can easily double or triple your real annual charge. Over a decade, that difference can eat thousands of pounds from your returns. This is not about trickery. Fund providers disclose the other costs, but they are not always in the same place or presented as clearly. The goal of this article is to give you a mental checklist so you can compare funds on a fair basis.

Why small percentage differences matter

Costs are one of the few things in investing you can control. You cannot control whether markets go up or down, but you can control how much of your return is eaten by fees. A difference of 0.5% in annual costs does not sound huge, but over 30 years it can reduce your final pot by 15% or more. That is the difference between retiring comfortably and retiring a few years later.

The problem is that many investors compare funds using only the TER or the ongoing charges figure (OCF), which is the UK equivalent. They assume that a fund with a 0.3% OCF is cheaper than one with a 0.6% OCF. That is often true, but not always. If the cheaper fund has high hidden costs, such as large transaction fees or a performance fee, the real cost could be higher. The TER is a useful starting point, but it is not the finish line.

For UK investors, the situation is made more confusing by the fact that different fund providers use different terminology. Some quote the TER, some use the OCF, and some show a ‘reduced ongoing charge’ that excludes certain items. The Financial Conduct Authority (FCA) has pushed for clearer disclosure, but the rules still allow funds to leave some costs out of the headline figure. You need to know what to look for.

How TER and OCF are calculated

The TER is calculated by taking all the expenses of running the fund and dividing them by the fund’s average net asset value over the year. The expenses included are things like the fund manager’s salary, administrative costs, audit fees, legal fees and custodian fees. These are the day-to-day costs of keeping the fund running. They are predictable and relatively stable from year to year.

In the UK, the OCF is now more commonly used than the TER. The OCF is very similar but excludes a few items that the TER includes, such as performance fees and some one-off costs. The OCF is meant to be a cleaner measure of ongoing costs, but it still leaves out several important items. The key point is that both the TER and the OCF are backward-looking. They tell you what the costs were last year, not what they will be next year. For most funds, the costs are fairly stable, but for funds that trade a lot, the transaction costs can vary significantly.

To understand what the TER includes, it helps to look at a typical breakdown. For a UK equity fund, the TER might include 0.5% for the management fee, 0.1% for administration, 0.05% for custody, 0.02% for audit, and 0.03% for other costs, giving a total of 0.7%. That seems clear. But the management fee itself can be misleading. Some funds charge a flat management fee, while others charge a tiered fee that reduces as the fund grows. The TER you see is an average, not necessarily what you will pay if the fund grows or shrinks.

The four costs TER does not include

Now we get to the part that matters most: what the TER leaves out. There are four main categories of cost that are not included in the TER or OCF, and they can be significant.

Transaction costs

Every time the fund manager buys or sells a security, there are costs. These include broker commissions, stamp duty, bid-offer spreads, and any market impact costs. These are not included in the TER because they are not ongoing expenses. They vary depending on how much the fund trades. A fund that turns over its entire portfolio every year will have much higher transaction costs than a fund that holds stocks for five years. The transaction costs are disclosed in the fund’s annual report, but they are not in the headline figure. For an actively managed fund, transaction costs can add 0.2% to 0.5% or more to the annual cost. For a passive tracker, they are usually much lower, often below 0.1%.

Platform and dealing fees

The TER covers the fund’s internal costs, but it does not cover the cost of the platform or broker you use to hold the fund. Most UK platforms charge an annual platform fee, typically 0.25% to 0.45% of your holdings. They also charge dealing fees when you buy or sell fund shares. These costs are separate from the TER and are paid by you directly. If you hold a fund with a 0.3% OCF on a platform that charges 0.4%, your total annual cost is 0.7%, not 0.3%. That is a big difference.

Performance fees

Some funds, particularly hedge funds and some actively managed funds, charge a performance fee. This is a percentage of any profits the fund makes above a certain benchmark. Performance fees are not included in the OCF, though they may be included in the TER in some cases. They are usually disclosed separately. A fund with a 1% OCF and a 20% performance fee could end up costing you much more in a good year. Performance fees can create an incentive for a manager to take more risk, so the important educational check is to understand the trigger, the percentage charged and whether any high-water mark applies.

Entry and exit fees

Some funds charge a fee when you buy in (entry fee) or when you sell (exit fee). These are not included in the TER. In the UK, entry fees are rare for retail funds, but exit fees still exist on some older funds or on funds held through certain platforms. Always check the fund’s Key Information Document (KID) for any entry or exit charges. KID is the current UK disclosure term; older material may still refer to a KID. Even a 1% exit fee can wipe out a year’s worth of returns if you need to sell unexpectedly.

A simple pounds-and-pence example

Let’s make this concrete. Suppose you invest £10,000 in two different funds. Fund A has an OCF of 0.3% and is a passive tracker. Fund B has an OCF of 0.6% and is an actively managed fund. On the surface, Fund A looks cheaper. But let’s add the hidden costs.

Fund A is a tracker that trades very little. Its transaction costs are 0.05% per year. You hold it on a platform that charges 0.25% per year. There are no entry or exit fees. Your total annual cost for Fund A is 0.3% (OCF) + 0.05% (transaction costs) + 0.25% (platform fee) = 0.6%.

Fund B is actively managed and trades frequently. Its transaction costs are 0.4% per year. It also charges a performance fee of 10% of any return above the benchmark, but we will ignore that for now because it is variable. You hold it on the same platform at 0.25%. Your total annual cost for Fund B is 0.6% (OCF) + 0.4% (transaction costs) + 0.25% (platform fee) = 1.25%.

Now the difference is much clearer. Fund A costs 0.6% per year, and Fund B costs 1.25% per year. Over 10 years, assuming a 5% annual return before costs, Fund A would grow to about £15,400, while Fund B would grow to about £14,200. That is a difference of £1,200, or about 8% of your final pot. And that is without even considering the performance fee, which could add more.

This example shows why you cannot rely on the OCF alone. You need to add transaction costs and platform fees to get a realistic picture. The platform fee is easy to find. The transaction costs are in the fund’s annual report, usually in a table called ‘costs and charges’ or ‘transaction cost disclosure’. It takes a few minutes to look up, but it is worth it.

A three-number habit worth building

As a beginner, the most practical thing you can do is to build a habit of checking three numbers before you buy a fund. First, the OCF or TER. Second, the transaction costs from the most recent annual report. Third, the platform fee you will pay to hold the fund. Add them together to get your total annual cost. Then compare that total across funds, not just the headline OCF.

You should also watch out for funds that have a low OCF but high transaction costs. This is common with funds that invest in emerging markets or small companies, where trading is more expensive. A low-cost tracker of the FTSE 100 will have very low transaction costs, while a fund that invests in Chinese small-cap stocks could have transaction costs of 0.5% or more even if the OCF is only 0.3%.

Another thing to check is whether the fund uses a ‘dilution levy’ or ‘swing pricing’. These are mechanisms that pass the cost of large trades on to the investors who cause them, rather than spreading them across all investors. They are not included in the TER, but they can affect your returns if you buy or sell at a time when the fund is experiencing large flows. The KID should mention if these are used.

Finally, remember that costs are not the only factor. A fund with higher costs might still be worth it if it delivers higher returns. Research such as SPIVA-style scorecards has repeatedly found that many active funds struggle to beat comparable passive benchmarks after costs, so it is safer to treat cost as a hurdle an active fund has to overcome rather than as the only factor that matters. The TER is a useful tool, but only if you know what it leaves out.

For a cleaner source trail, treat this as a reading order rather than a recommendation. Start with the fund factsheet or KID, then open the annual report if the transaction-cost table is not obvious, then check your platform’s own tariff. The FCA’s public InvestSmart material is a useful reminder that a regulated disclosure is still something the reader has to understand, not a promise that the product is suitable. If any cost line is missing, unclear or described only in marketing language, that is a reason to pause and ask where the number comes from before comparing it with another fund.

Educational caveat: This article is for educational purposes only and does not constitute financial or investment advice. The value of investments can fall as well as rise, and past performance is not a guide to future returns. Always consider your own circumstances and seek independent advice if needed.

Further reading: For related Cristoniq background, see platform fee basics, reading a fund factsheet, and active versus passive investing.