Choosing an investment platform is not only about its headline price. The cost of investing can include a provider’s account charge, charges within the investments you hold, and costs triggered when you trade or convert currency. This guide offers a like-for-like comparison framework for UK self-directed investors. It is general information, not personal financial advice.

The fee layers to understand before comparing platforms

A platform fee is only one part of the possible cost of investing. Investment charges may be levied by the account provider, the manager of a fund you hold and, in some circumstances, the government. Treating every cost as one “platform fee” can make a comparison look simpler than it really is.

Start by separating costs into two broad groups. Ongoing costs are connected with keeping an account or an investment over time. Transaction-specific costs arise when you take an action, such as placing a trade or converting money for an overseas investment. A fund’s manager charge is different from the fee a platform charges for holding the account, so both may matter if you use a fund.

The exact charge lines will depend on the account, investment and provider terms. A useful comparison therefore begins with a list of the investments you expect to hold and the actions you expect to take. You can then check the relevant provider terms rather than assuming a single rate covers every situation.

For a broader framework for evaluating services, see the investment platform comparison guide.

Account charges and custody fees

An account charge is the fee paid to a provider for holding investments in an investment account. Providers can use different names for this same broad type of cost, including platform charge, service charge, custody fee, administration fee or ongoing platform fee. Comparing labels alone is not enough; check what the charge covers and how the provider applies it.

The pricing basis can also differ. An account charge may be stated as a percentage of the value of investments held, while some providers use a flat rate instead. This difference affects how you should compare platforms: a percentage and a flat cash charge are not directly comparable until you consider the value you expect to hold and the terms that apply to that account.

Check the charging frequency as well. A provider may collect charges monthly, but current terms determine the timing, any account-specific conditions and whether a cap applies. Keep the provider’s current schedule with your comparison notes so that you are not relying on an old headline figure.

For account eligibility and structure, see investment account types and eligibility.

Funds shares and ETFs: compare the relevant charge lines

Funds, shares and ETFs should be compared by checking the charge lines relevant to each holding, rather than by assuming that one investment type has the same costs as another. The platform’s account charge is one potential provider-level cost. A fund manager’s charge is separate from that platform charge and should be considered alongside it when you hold a fund.

Build a small grid for the holdings you expect to buy. For each fund, share or ETF, note the ongoing account charge, the investment-level charge where relevant, and any costs that may be associated with dealing. The purpose is not to predict a total cost before you have the terms; it is to make sure each possible charge line is checked in the right place.

This matters especially where you may mix investments. A portfolio containing funds and exchange-traded holdings may require you to review more than one set of applicable terms. Check the provider’s current charging pages and the investment documents for the holdings you are considering. Do not assume that a fund charge replaces the account charge, or that an account charge includes every transaction-related cost.

Use the same approach if you change your intended mix later. A platform that appears suitable for one set of holdings may need a fresh comparison if you add different investments or trade in a different way.

Read funds versus ETFs guide for a separate discussion of those investment types.

Foreign exchange costs for overseas investments

Currency conversion deserves its own line in a fee comparison whenever you plan to buy, sell or receive money connected with overseas investments. It is easy to overlook because it may not sit beside an account’s main ongoing charge.

Record the currency in which the investment is dealt and identify when conversion could occur. Then check the provider’s current terms for its treatment of foreign exchange, including how a conversion charge is presented and when it may be applied. Keep this separate from account, fund and dealing charges so that you do not accidentally count it twice or omit it altogether.

Foreign exchange costs may be irrelevant to a plan focused entirely on investments dealt in sterling, but they become a visible comparison item when currency conversion is part of how you intend to invest. The right question is not whether every platform always charges the same way; it is whether currency activity is part of your own intended use and what the current provider terms say.

For background, see overseas investing basics.

Build a like-for-like platform fee comparison

AI-generated generic editorial illustration — not a retailer product photo and does not depict the reviewed product or service. Give readers a practical visual checklist for gathering like-for-like platform costs.

Give readers a practical visual checklist for gathering like-for-like platform costs Use one worksheet for every platform you are considering. Start with the account type and the value you expect to hold. Then create separate rows for account or custody charges, fund manager charges, dealing-related costs, ETF or share-related terms where relevant, and foreign-exchange costs where relevant. Mark each row as ongoing, one-off or activity-dependent.

Next, record how each charge is expressed. Is it a percentage of investments, a flat cash amount, or a cost tied to a particular action? Note when the provider takes the charge and whether its current terms describe any cap or account-specific condition. This is more useful than comparing only a headline annual percentage because it shows how the charge may operate in practice.

Keep the comparison scoped to the same assumptions. Compare the same account type, intended holdings, estimated portfolio value and expected level of activity across providers. If one option is being assessed for funds only and another for a mix of funds, shares and overseas securities, label that difference rather than treating the results as directly equivalent.

Finally, revisit the provider’s current terms before acting. Charges can differ between providers, and charge pages can distinguish between account types or holdings. Your worksheet is a decision aid: it helps you ask complete questions, but it does not replace reading the terms that govern the account you may open.

For a step-by-step method, see how to compare investment platforms.

Match the fee structure to how you plan to invest

Charges are a relevant factor when deciding where to invest because they differ between providers. But the lowest apparent charge is not automatically the best fit. First identify what you want the account to do: the investments you expect to hold, whether you expect to trade, and whether overseas-currency activity is likely.

Use those plans to decide which rows on your comparison worksheet matter most. An investor focused on a long-term fund holding may need to pay particular attention to the ongoing account and fund-related charge lines. Someone planning to hold shares, ETFs or overseas investments should check the additional terms relevant to those activities. This is a framework for comparing fit, not a recommendation to choose a particular provider or investment.

Your goals and time horizon also matter. Taking time to understand what you are investing in can help you judge whether an investment suits your needs and aims. Platform terms should therefore sit alongside—not replace—your wider assessment of what you plan to invest in and why.

See investment goals and time horizon for more context.

Keep platform selection separate from financial readiness

Choosing a platform is not the first financial decision in investing. FCA consumer guidance says it is important to get immediate finances in order before investing, including prioritising short-term debt and building an emergency cash fund. It specifically says not to use an emergency cash fund to invest.

The same guidance says never to invest using a credit card. Interest and charges can mount up and may exceed any investment returns; a loss on the investment would not remove the debt that still has to be repaid.

Use a fee comparison only after considering whether investing fits your immediate circumstances and objectives. A clear platform worksheet can support a future decision, but it cannot determine whether a particular investment, time frame or level of risk is right for you.

For a readiness checklist, see are you ready to invest.

Frequently Asked Questions

Are platform fees the same as fund charges?

No. An account or platform charge is paid to the provider for holding investments in the account. A fund manager charge is a separate charge connected with the fund. If you hold a fund through a platform, check both relevant charge lines rather than treating one as a substitute for the other.

Do not assume so. The applicable terms can depend on the provider, account and holdings. Compare each intended fund, share or ETF using a worksheet that separates the ongoing account charge from investment-level and activity-dependent charge lines. Check the provider’s current terms for the exact treatment.

When do foreign-exchange costs matter?

Include them when your intended investing activity involves currency conversion, such as activity connected with overseas investments. Keep the foreign-exchange row separate from account and dealing costs, then consult the provider’s current terms to see how and when conversion is treated.

Should the cheapest platform always be the best fit?

Not necessarily. Charges differ between providers and are relevant, but the comparison should reflect your intended investments, account requirements and expected activity. It should also sit alongside your goals, understanding of the investments and financial readiness—not replace them.

For further reading, see investment fees explained.

Next step: use the fee-comparison checklist to collect the current terms for each platform on your shortlist.

Sources

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