Which UK ISA platform is cheapest for you?
UK platforms charge either a percentage of your pot or a flat fee, and which is cheaper flips as your balance grows. Set your pot size to see the annual platform cost at each, cheapest first.
| Platform | Fee model | Annual platform fee |
|---|---|---|
| InvestEngine | £0 (ETF-only) | Free |
| Trading 212 | £0 | Free |
| interactive investor | Flat £5.99/mo (£14.99 over £100k) | £72 |
| Vanguard UK | 0.15% capped £375; £4/mo under £32k | £75 |
| AJ Bell | 0.25% (funds) | £125 |
| Hargreaves Lansdown | 0.35% (funds) | £175 |
Platform fee only, for funds/ETFs (excludes dealing and the funds' own charges). Percentage platforms are cheapest for small pots; a flat fee wins once the pot is large enough, which is the crossover to watch. InvestEngine and Trading 212 are ETF/stock-focused. Figures are illustrative and verified as of 2026, so check current terms.
Want the full picture? Read best broker for a Stocks and Shares ISA, or compare platforms on everything else with Brokerlens.