An investment platform is where you open your accounts and buy, hold, and sell your investments. Choosing the right platform matters significantly — fees vary considerably between providers, and a small difference in annual charges compounds into a large difference in long-term returns. This guide explains what to look for when comparing UK investment platforms in 2026.
What does an investment platform do?
A platform acts as the intermediary between you and your investments. You open an account — such as a Stocks and Shares ISA — deposit money, and use the platform to buy and sell funds, ETFs, and shares. The platform holds your investments on your behalf and provides the interface through which you manage everything.
What to look for when comparing platforms
Platform fees
This is the single most important factor. Platforms charge in two main ways:
Percentage-based fees — typically 0.25–0.45% of your portfolio per year. Better for smaller portfolios — the fee is proportionate to what you hold.
Flat fees — a fixed monthly or annual charge regardless of portfolio size, typically £10–£25 per month. Better for larger portfolios — the percentage cost falls as your holdings grow.
For portfolios below roughly £25,000, percentage fees usually work out cheaper. Above that, flat-fee platforms become more cost-effective. Always calculate the total annual cost in pounds for your specific portfolio size before opening an account.
Fund dealing charges
Some platforms charge per transaction when you buy or sell a fund. Others offer free fund dealing. If you invest regularly via direct debit, dealing charges accumulate — look for platforms offering free or low-cost regular investing.
Fund range
Check your chosen funds are available before opening an account. Most major platforms offer a wide range of index funds and ETFs, but there can be gaps — particularly for specific overseas-listed ETFs.
Account types available
Most people need a Stocks and Shares ISA at minimum. If you also want a SIPP (pension), Junior ISA, or General Investment Account, check the platform offers everything you need — consolidating to one platform simplifies management considerably.
Usability and app quality
If you’re new to investing, an intuitive interface reduces friction. Check app store reviews and whether the platform suits your preference for mobile-first or desktop management.
Are investment platforms regulated and safe?
All legitimate UK investment platforms are authorised and regulated by the Financial Conduct Authority (FCA). Your investments are also protected by the FSCS up to £85,000 if the platform fails — though this covers firm failure only, not falls in investment value. Always check FCA registration before using any platform.
How to compare platforms
For current comparisons and fee calculators, Lang Cat’s Comparator tool and MoneySavingExpert’s investment platform guide are regularly updated and cover all major UK providers. Always compare total annual cost — platform fee plus fund charges — rather than either figure in isolation. A cheap platform with expensive funds can cost more than a slightly pricier platform with low-cost index funds.
Frequently asked questions
What is the cheapest investment platform in the UK?
It depends on your portfolio size and trading frequency. Vanguard is widely cited as very low cost for index fund investors. For larger portfolios, flat-fee platforms like Interactive Investor become more competitive. Always calculate the total annual cost in pounds for your specific situation.
Is my money safe on an investment platform?
Your investments are held separately from the platform’s own assets, protecting them if the firm fails. FSCS protection covers up to £85,000 per platform. This does not protect against falls in investment value — that risk is inherent to investing.
Can I transfer my ISA to a different platform?
Yes — you can transfer your ISA between platforms without losing your tax-free status or using your annual allowance. See our guide to how to transfer an ISA for the full process and what to watch out for.