An investment platform is the service through which you open accounts, hold investments, place trades and receive statements. Moving later can take time and may involve charges, so it is worth choosing deliberately.
There is no single best platform. A low-cost service for someone making one monthly fund investment may be expensive for a frequent share trader, an investor holding overseas securities or someone with a larger pension.
1. Decide which account you need
The platform must offer the appropriate legal and tax wrapper. Common options include:
- Stocks and Shares ISA: investment income and capital gains within the account are generally free from UK tax. The overall ISA subscription limit is £20,000 for the 2026 to 2027 tax year.
- General Investment Account: an unwrapped account with no ISA contribution limit, but dividends, interest and gains may create tax liabilities.
- Self-invested personal pension: a pension account offering tax advantages and restrictions on access. Compare administration, drawdown and transfer charges as well as the ordinary platform fee.
- Junior ISA or junior pension: accounts for children, with different contribution and access rules.
Think beyond the first account. Keeping an ISA, pension and general account together can simplify administration, but convenience should be weighed against total cost and investment choice.
Tax rules depend on individual circumstances and can change. Check the current rules rather than choosing a platform from an old allowance figure.
2. Calculate the complete annual cost
Do not compare only the number shown most prominently on a pricing page. Build an annual estimate containing every charge that applies to your behaviour.
| Cost | What to check | Who should pay particular attention |
|---|---|---|
| Platform or custody fee | Fixed amount, percentage of assets, charging tiers and any cap | Larger portfolios and investors holding several account types |
| Fund or product charge | Ongoing charge for each fund, ETF or investment trust | Everyone, because this is separate from the platform fee |
| Dealing charge | Cost for buying and selling funds, shares, ETFs and trusts | Frequent traders and regular monthly investors |
| Foreign-exchange charge | Percentage or spread applied when buying, selling or receiving income in another currency | Investors buying overseas shares or foreign-currency assets |
| Cash treatment | Interest paid, interest retained and whether the platform charges fees on cash | Anyone expecting to hold meaningful cash for a prolonged period |
| Account extras | Pension administration, drawdown, telephone dealing, paper statements and transfer or closure costs | Pension investors and people who need assisted service |
The FCA has found that activity-based charges, foreign exchange costs and the treatment of interest on cash can be harder for consumers to locate. If a provider cannot show a complete charge schedule, ask for one before opening an account.
A simple worked comparison
Consider a hypothetical £40,000 portfolio making 12 purchases a year:
- Platform A charges 0.25% a year and no dealing fee. Its platform cost would be £100.
- Platform B charges a fixed £60 plus £5 for each purchase. Its platform and dealing cost would be £120.
On those limited assumptions, Platform A costs less. At £100,000, the same percentage fee would be £250 while Platform B would still cost £120. Caps, fund charges, sales, foreign exchange, pension fees and other services could change the answer.
For a useful comparison, calculate at your current portfolio value and at a plausible value three to five years from now.
3. Confirm the investments you can buy
A large headline number of available investments is less useful than access to the particular holdings you need. Check:
- Whether your chosen funds or ETFs are available in the correct share class.
- Access to UK shares, investment trusts, gilts, corporate bonds and overseas markets where relevant.
- Whether fractional shares are supported and how ownership and voting rights work.
- Whether regular investing is available at a lower dealing cost.
- How dividends are handled and whether automatic reinvestment carries a fee.
- Whether cash can be held in sterling and other currencies.
More choice is not automatically better. A simple, diversified portfolio may require only a handful of low-cost investments. The platform should make those holdings accessible without encouraging unnecessary trading.
4. Verify the firm independently
UK investment platforms normally need FCA authorisation. Use the FCA Firm Checker or Financial Services Register and confirm:
- The legal entity operating the platform.
- Its FCA reference number and current authorisation status.
- That its permissions cover the service being offered.
- That the website and contact details match the regulator's record.
- Any regulatory restrictions, notices or disciplinary history.
Do not rely on a logo or FCA number displayed on the provider's own website. Clone firms can copy genuine regulatory details.
5. Understand protection and custody
FCA authorisation, segregation of client assets and FSCS protection are related but different concepts.
- Authorisation: confirms that the firm has regulatory permission for specified activities.
- Client-asset arrangements: describe how the platform holds or safeguards investments and client money separately from its own assets.
- FSCS protection: may compensate eligible customers when an authorised financial firm has failed and cannot meet a valid claim. It does not cover ordinary investment losses or poor market performance.
Ask which legal entity holds your account, which custodian or nominee holds the investments, how uninvested cash is placed and what would happen during an insolvency. Protection depends on the product, the firm, the cause of the loss and your eligibility.
6. Test the service you will depend on
A platform is long-term financial infrastructure. Before transferring a large portfolio, examine:
- Website and app reliability, including two-factor authentication and account alerts.
- Clarity of contract notes, tax documents, pension statements and performance reporting.
- Telephone, secure-message and accessibility support.
- Complaint procedures and typical response channels.
- Whether another trusted person can be given appropriate authority if needed.
- How the service deals with bereavement and loss of mental capacity.
Consider opening with a modest contribution before transferring everything. This lets you test funding, purchasing, documents and support without committing the full portfolio.
7. Examine transfer rules before joining
Transferring later is not always instant. Check the process at both the new and existing platform.
- In-specie transfer: investments move without being sold, if both platforms support the same holdings. This can take longer but avoids time out of the market.
- Cash transfer: investments are sold and cash moves to the new provider. Prices may change while the money is uninvested.
- ISA transfer: use the receiving provider's formal ISA transfer process. Withdrawing and reinvesting the money yourself can affect its tax status and allowance treatment.
- Pension transfer: check exit fees, safeguarded benefits, supported investments and any advice requirements before proceeding.
Also check whether the platform charges to transfer each holding, close an account or move into pension drawdown.
8. Match the platform to your behaviour
| If you mainly... | Prioritise... |
|---|---|
| Make one regular fund investment | Low fund dealing costs, automation and a competitive percentage or fixed fee |
| Hold a larger buy-and-hold portfolio | Fee caps, fixed-price alternatives, custody and transfer arrangements |
| Trade shares or ETFs frequently | Dealing charges, spreads, order types and the risk of overtrading |
| Buy overseas shares | Foreign-exchange charges, market access, tax documentation and currency handling |
| Manage a SIPP | Pension administration, drawdown functionality, support and beneficiary processes |
| Want decisions made for you | Whether the service is advised, discretionary or simply offers pre-built portfolios, plus the complete underlying cost |
A practical platform checklist
Before opening an account, record a clear answer to each question:
- Does it offer the account and exact investments I need?
- What would I pay over one year for my portfolio and trading pattern?
- How would that cost change if the portfolio doubled?
- What happens to cash, and how much interest is retained?
- Is the operating firm authorised for the relevant service?
- How are investments and cash held?
- Which losses may qualify for FSCS protection, and which do not?
- Can I transfer my holdings elsewhere without selling?
- What support is available when something goes wrong?
- Does the interface help me follow my plan, or encourage unnecessary activity?
The Apolifina view
Start with suitability for your intended account and investments, eliminate firms that fail the authorisation and custody checks, then compare complete annual cost. Only after those tests should app design, promotional offers or extra research tools decide between the remaining candidates.
A platform should make a sensible investment plan easier to maintain. It should not require constant attention or push you towards products and trades you did not originally intend to make.
Official sources
Continue reading: What is a Stocks and Shares ISA? · Workplace pension or SIPP? · How robo-advisers work