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 | Annual platform fee | Fee model |
|---|---|---|
| InvestEngine | Free | £0 (ETF-only) |
| Trading 212 | Free | £0 |
| XTB | Free | £0 (0.2% over £100k/mo turnover) |
| interactive investor | £72 | Flat £5.99/mo (£14.99 over £100k) |
| Vanguard UK | £75 | 0.15% capped £375; £4/mo under £32k |
| AJ Bell | £125 | 0.25% (funds) |
| Hargreaves Lansdown | £175 | 0.35% (funds) |
| Moneybox | £237 | £1/mo + 0.45% |
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.