Investment Platform Fees Explained (UK Guide 2026)

Most investors do not lose money on fees because fees are "high." They lose money because they do not understand which fees apply to them — and they are on the wrong platform for their situation. A platform that costs a beginner nothing can quietly cost a larger investor hundreds of pounds a year more than the alternative.

This guide explains every type of investment platform fee you will encounter in the UK, how they stack, which ones matter most for your situation, and how to compare platforms properly before you open an account.

Independent UK guide · Fees based on current published provider schedules · Updated March 2026 · This is informational, not financial advice.

This guide is most useful for: UK investors choosing a Stocks & Shares ISA, comparing DIY platforms, or trying to understand whether flat fees, percentage fees, or zero-fee brokers are cheapest for their portfolio size.

The Main Types of Investment Platform Fees

There are seven distinct fee types you will encounter across UK investment platforms. Most investors only think about the first one.

1. Platform fee (also called custody fee or account fee)

The annual or monthly charge the platform makes simply for holding your investments. This is the most-compared number in any ISA or investment account comparison. It can be structured as:

• A percentage of your portfolio (e.g. 0.25%/year)
• A flat monthly or annual fee (e.g. £11.99/month)
• Zero — some platforms charge no platform fee at all

Why it matters: For passive investors who buy and hold funds or ETFs, the platform fee is often the dominant annual cost. On a £50,000 portfolio, 0.25% = £125/year. A flat fee of £11.99/month = £143.88/year regardless of portfolio size.

2. Dealing / trading fee

A charge applied each time you buy or sell an investment. More relevant for active traders and stock pickers than for passive ETF investors who trade infrequently.

• Traditional full-service platforms often charge £3–£12 per trade
• Most modern app-first platforms offer 0% commission on ETFs and stocks
• Interactive Investor includes one free trade per month

Why it matters: If you trade 20 times a year at £10 per trade, you are paying £200 in dealing fees alone — before platform fees or fund costs. Commission-free platforms eliminate this entirely for most investors.

3. Fund charge / OCF (Ongoing Charge Figure)

The annual cost charged by the fund manager — not the platform. This applies to ETFs, index funds, and active mutual funds. It is taken directly from the fund's assets, so it reduces your returns rather than appearing as a separate bill.

• Passive index funds and ETFs: typically 0.03%–0.20%/year
• Active managed funds: typically 0.50%–1.50%/year
• Robo-advisor portfolios: often 0.20%–0.75%/year for the underlying

Platform fee vs fund fee: what is the difference?

A platform fee is what the investment platform charges for holding your account. A fund fee (usually shown as the OCF) is what the fund manager charges for running the fund itself. These are separate costs charged by different parties.

Example: if your platform charges 0.25% per year and your ETF charges 0.15% per year, your combined annual cost is approximately 0.40% before any FX fees or dealing commissions. Many beginners compare platforms on the platform fee alone and miss the total cost entirely.

4. FX fee (foreign exchange charge)

A charge applied when you buy or sell investments denominated in a foreign currency — most commonly US shares (priced in USD). This fee is often overlooked by beginners but can matter significantly for stock pickers buying US or international equities.

• Trading 212: 0.15% FX fee — one of the lowest available
• Hargreaves Lansdown: 1% FX fee on smaller trades
• Many platforms: 0.50%–1.00% per currency conversion

Why it matters: A 1% FX fee on £500 of US shares bought monthly = £60/year in currency conversion charges alone. Over a long investing lifetime, this adds up substantially.

5. Spread

The difference between the buy price and the sell price of an investment. Not a fee you pay directly — but a cost you bear. Most relevant on instant-buy interfaces, less relevant on traditional order-book trading.

Some platforms with no headline fees recover costs through wider spreads on simple buy/sell interfaces. This is one reason why "zero fee" platforms are not always as free as they appear for every transaction type.

6. Transfer / exit fees

Some platforms charge to transfer your ISA or investments out, either to a new platform or to another account. This matters far more than most people expect when they are choosing a platform.

• Some platforms charge per line of stock transferred (e.g. £25 per holding)
• Some platforms offer fee-free transfers in and out
• Poor transfer terms can effectively trap your money through friction even when the investments themselves are portable

Always check the transfer-out policy before you open an account, not after.

7. Managed portfolio / advisory fee

Applies if you use a robo-advisor or managed account service such as Nutmeg, Wealthify, or Moneyfarm. This is charged on top of the underlying fund costs.

• Nutmeg fully managed: 0.75%/year platform fee
• Underlying fund cost: additional 0.20%–0.30%/year
• Total combined: typically 0.90%–1.10%/year or more

You are paying for professional management, goal-setting, and rebalancing. That may be worth it to you — but understand that you are paying significantly more than a self-managed ETF portfolio would cost.

Percentage Fees vs Flat Fees vs Zero-Fee Platforms

UK investment platforms use three main fee structures. Understanding them is the single most useful thing you can do before choosing a platform.

When does a flat fee become cheaper than a percentage fee?

This is the most commercially important calculation in platform comparisons. The break-even point is where the flat fee and percentage fee produce the same annual cost.

Example: Interactive Investor charges £11.99/month = £143.88/year. AJ Bell charges 0.25%/year. At what portfolio size does II become cheaper?

£143.88 ÷ 0.0025 = £57,552

Above roughly £57,500, Interactive Investor's flat fee costs less per year than AJ Bell's 0.25% charge. Below that, AJ Bell is cheaper. For a £100,000 portfolio, AJ Bell costs £250/year vs II's £143.88. The difference is £106/year — which compounds significantly over a long investment horizon.

For zero-fee platforms like Trading 212, the platform fee never increases regardless of portfolio size — making them competitive at any portfolio size on platform fee alone.

Which Fees Matter Most for Different Investors?

Quick takeaway: If you are a passive ETF investor, your outcome is largely driven by platform fee + fund cost. If you are buying US shares regularly, FX fees can quietly become your biggest expense. Match your platform to your behaviour — not to marketing.

Real Examples: How Platform Fees Stack Up

These scenarios use approximate published fee structures as of March 2026. Always verify current fees with each provider before opening an account.

All scenarios are illustrative based on published fee structures as of March 2026. Fund OCF figures are examples. Always verify current fees directly with each provider.

How Fees Affect Long-Term Returns

This is where fee differences stop feeling abstract and become real money. A 0.50% annual fee difference sounds small, but over 20 or 30 years it can materially reduce your ending portfolio value. The examples below are simplified illustrations to show the direction and scale of the effect — not precise forecasts.

Illustrative only. These figures assume constant annual returns and do not account for inflation, tax, or contributions. They are intended to show the directional impact of fee differences — not to predict actual returns.

These examples assume no additional contributions and a constant annual return. Real-world outcomes will vary — but the directional impact of fees remains consistent.

Hidden and Misunderstood Investment Platform Fees

The most expensive fees are often the ones investors do not realise they are paying. That is why so many people think they are on a "cheap" platform when they are not.

These are the fees most UK investors either miss entirely or discover too late.

• FX charges on US shares: Buying Amazon, Apple, or any US stock converts GBP to USD. A 1% FX fee on £500/month of US shares = £60/year in currency conversion costs before any trades or platform charges.
• Fund charges beneath the platform fee: The OCF comes out of your fund's performance silently. It does not appear on your statement as a charge — but it reduces your returns every year. A fund with 0.75% OCF costs you seven times more per year than one at 0.10%.
• Platform upgrade or premium tier charges: Freetrade charges £4.99/month for ISA access (otherwise it is a GIA only). Some platforms offer "premium" tiers with higher charges. Always check what tier you are actually on.
• Transfer-out fees per holding: Some platforms charge £10–£25 per line of stock or fund to transfer out in-specie. A portfolio with 20 holdings could cost £200–£500 to move. This is one of the most underestimated friction costs in investing.
• Spreads on instant-buy interfaces: When you use a simple "buy now" button rather than a limit order, the spread between buy and sell prices is embedded in your transaction cost. On volatile assets, this can be meaningful.
• Managed fees stacked on ETF costs: A robo-advisor might charge 0.75% on top of 0.25% fund charges. The total of 1.00%+ per year is often five to ten times the cost of a self-managed ETF portfolio.

How to Compare Investment Platforms Properly

Use this checklist before opening any investment account or ISA:

1. What are you investing in? ETFs only, individual stocks, US shares, managed funds, or a mix?
2. How large is your portfolio? Below ~£20,000, zero-fee and low-percentage platforms usually dominate. Above roughly £60,000, flat-fee platforms often become more competitive — although the exact break-even point depends on which platforms you are comparing.
3. How often will you trade? Buy-and-hold investors can ignore dealing fees. Active traders need to factor them in carefully.
4. Do you buy overseas shares? If yes, FX fee is a significant cost. Prioritise low FX rate platforms.
5. DIY or managed? If managed, expect to pay 0.75%–1.00%+ total. Decide whether that is worth it relative to a self-managed ETF approach.
6. What are the underlying fund charges? Add the OCF to the platform fee to get your true annual investment cost.
7. What are the transfer-out terms? Check before you open an account, not when you want to leave.
8. Does the platform have a free tier for what you want? Some charge only for ISA access, others charge for the account itself.

Which Investment Platform Is Cheapest for You?

Platform fee comparison only. Total cost depends on fund charges, FX fees, dealing commissions and investment style. See our full cheapest ISA platforms guide if your priority is minimising total cost, or compare the best ISA platforms side-by-side to find the right fit for your investing style.

Frequently Asked Questions