Cost of Investing Tool – Compare UK Platform Fees

Platform fees are easy to overlook because they are small percentages - until you see what they compound to over 10, 20, or 30 years. This tool compares the total cost of investing across three of the UK's most popular platforms: Vanguard, Fidelity, and AJ Bell. Enter your portfolio size and annual contributions to see the real difference in fees over time.

It is built for UK investors choosing where to hold their ISA, SIPP, or general investment account - who want to pick a platform that is genuinely cost-effective for their situation, not just the one with the most advertising. Fees are structured differently across platforms (percentage-based vs. flat cap), which means the cheapest option depends entirely on your portfolio size.

The goal is not to tell you which platform to use. It is to remove the fog so you can make the comparison yourself, clearly. Pair this with the Investment Returns Calculator to see how reducing fees improves your long-term outcome.