Investment fees are paid quietly, automatically, and in ways that most investors never directly observe. Unlike a stock loss — which is visible, emotionally impactful, and sometimes prompts action — fees leave no obvious mark. They are simply not there: the percentage that would have compounded, silently absent year after year. The cumulative effect over 20 or 25 years is one of the largest single determinants of investment outcomes, and it is almost entirely within an investor's control.
The compounding of costs: why the numbers are so large
The impact of an additional 1% in annual investment costs over a 25-year period is not 25% of final portfolio value. It is, depending on the return environment, approximately 20–25%. This sounds counterintuitive until you understand how compounding works — not just on returns, but on the returns that were never earned because they were taken in fees.
Consider a £500,000 portfolio earning 7% per year before costs:
- At 0.5% total annual cost: the portfolio grows to approximately £2.4 million over 25 years
- At 1.5% total annual cost: the portfolio grows to approximately £1.9 million
- At 2.5% total annual cost: the portfolio grows to approximately £1.5 million
The difference between the 0.5% and 2.5% scenarios is approximately £900,000 — more than the original investment, lost entirely to fees.
These numbers are not hypothetical. Older UK pension and investment products routinely had total charges in the 2–3% range. Many investors from the pre-RDR (Retail Distribution Review, 2013) era are still in such products. The switch from an expensive old product to a modern low-cost equivalent can be one of the most significant financial decisions available to them.
The layers of investment cost
Investment costs exist in multiple layers, and it is the total that matters — not any single element:
1. Platform or product wrapper charge
This is the charge levied by the investment platform, bond provider, or pension scheme for administration, custody, and access. On mainstream UK platforms (Hargreaves Lansdown, AJ Bell, Vanguard UK), this is typically 0.25–0.45% per year on assets up to certain levels, reducing above those levels. On international platforms and offshore bond providers, charges may be structured differently — fixed annual fees, or a percentage with a minimum.
2. Fund ongoing charges figure (OCF)
Every fund charges an annual fee for managing the money. For passive index-tracking funds and ETFs, this is typically 0.05–0.25% — very low. For actively managed funds, the OCF ranges from 0.50% to 1.5%+ depending on the fund type, market, and manager. Specialist funds (infrastructure, alternatives, private equity vehicles) often charge more.
The OCF is deducted from the fund's assets daily and reflected in the published net asset value — so it is never visible as a line item charge, which is one reason it receives insufficient attention.
3. Transaction costs within the fund
Funds incur costs when they buy and sell underlying securities. These are not included in the OCF but are disclosed in a separate "transaction cost" figure in PRIIPS/KIID documentation. For index funds tracking liquid markets, these costs are minimal. For actively managed funds with high turnover — particularly in less liquid markets — transaction costs can add 0.2–0.5% or more.
4. Trading costs you pay directly
When you buy or sell investments on a platform, you may pay a dealing charge. This varies from free (many platforms now offer commission-free trades on ETFs) to £10–15 per trade. For investors who trade frequently, these costs can accumulate; for long-term buy-and-hold investors, they are negligible.
5. Adviser charge
If you use a financial adviser, their charge is a legitimate cost of the advice relationship. Post-RDR, adviser charges must be disclosed explicitly — typically 0.5–1% of assets per year for ongoing service, or a fixed fee for project work. The value question is whether the advice generates at least that much value through tax efficiency, better structure, pension advice, or behavioural coaching. For many clients, it does; for those requiring only simple portfolio management, it may not.
6. Switching and exit costs
Some products — particularly older insurance-based investments, with-profits bonds, and some pension schemes — carry exit penalties if you leave within a specified term, or market value adjustments (MVAs) on with-profits policies. These can significantly affect the net cost of switching out of an expensive product. Any transfer or consolidation exercise must factor in the switching cost against the long-term benefit of lower ongoing charges.
Benchmarking your total cost
The all-in cost for a typical diversified investment portfolio should be:
- Under 0.8% p.a.: good — this is achievable with a low-cost ETF portfolio on a mainstream platform without an adviser, or a well-priced advised portfolio on an efficient platform
- 0.8–1.5% p.a.: reasonable if the advice and platform are delivering value — typical for a mid-market advised portfolio
- 1.5–2% p.a.: high — scrutinise what you are getting for this; switching may be beneficial
- Above 2% p.a.: very high — this level of cost significantly damages long-term outcomes; review urgently unless there is a specific reason (a complex product or market that genuinely warrants it)
To calculate your total cost, add up: your platform charge + the weighted average OCF of your funds + any adviser charge. Transaction costs can be estimated but are often small for long-term investors.
The hidden costs
Beyond the explicit charges are costs that are less visible:
Cash drag. Many investment platforms hold a small amount of the portfolio in cash at all times — cash awaiting investment, dividend income not yet reinvested, or simply a default "cash" allocation. This cash earns below-market rates or nothing at all. If 5% of your portfolio sits in cash earning 1% while the rest earns 6%, the effective drag is 0.25% per year — meaningful over time.
Bid-ask spread. When you buy an investment, you pay the "ask" price; when you sell, you receive the "bid" price. The spread between these is a transaction cost that is particularly meaningful for less liquid assets (small-cap stocks, some bond funds, ETFs tracking illiquid indices).
Behavioural costs. This is arguably the largest hidden cost for many investors — the loss from buying high, selling low, and making emotionally driven switches. Research by Dalbar and others consistently estimates that the average investor significantly underperforms the funds they are invested in due to mistimed buying and selling. This is not a platform or product cost, but it is a real cost, and it is where independent financial advice can deliver its most significant value.
DIY versus advised investing: when does advice pay?
The question of whether to manage investments independently or use a financial adviser should be framed as: does the advice cost more or less than the value it creates?
For a straightforward portfolio of global index ETFs held in an ISA or GIA with no cross-border complexity, DIY investing on a low-cost platform is entirely viable. The cost is minimal; the investment is simple; there is no complexity requiring specialist knowledge.
For internationally mobile investors with cross-border tax situations, pension transfer decisions, offshore bond structuring, IHT planning, or multi-currency considerations, the value of expert independent advice routinely exceeds the cost. A well-structured pension transfer, an offshore bond appropriately designed for a client's anticipated tax residency, or an IHT-efficient estate plan can each deliver value that dwarfs a 0.75% adviser charge over a lifetime.
The mistake is applying the DIY logic to complex situations — or, conversely, paying ongoing advisory fees for a situation that is genuinely straightforward.
The value of investments can fall as well as rise. Past performance is not a reliable indicator of future results. The examples in this article are illustrative and do not represent actual investment outcomes. Tax rules vary by jurisdiction and are subject to change. This article does not constitute personal financial advice.
How Global Investments can help
We provide independent financial advice for internationally mobile clients. Our advice process begins with a complete review of your existing investment structure, costs, and tax position — and we can identify where savings are available before any changes are made. Contact us to arrange an initial review.
This article is for general information only and does not constitute financial, legal or tax advice. Rules, prices and regulations change; verify current requirements with a qualified adviser before acting.