The Fee Structure: What You Actually Pay
AJ Bell runs a charging model that's simpler than most competitors — and cheaper for the majority of UK investors. The headline: 0.25% per year on everything you hold, capped at £3.50 per month per ISA or dealing account (£42 per year maximum).
That cap is the entire thesis for this platform. AJ Bell gets cheaper as your portfolio grows. Percentage-based competitors get more expensive. The crossover point — where the cap kicks in — is £16,800. Above that, your platform bill stops.
Here's the dealing fee breakdown as of July 2026, confirmed against the live charges page:
- Regular investing: £0 — completely free via monthly Direct Debit (minimum £25/month). This is the sleeper feature.
- Online share dealing: £5.00 per trade (£3.50 if you made 10+ deals the previous month)
- Fund dealing: £1.50 per deal (one-off; regular investing is free)
- Foreign exchange: 0.75% on international trades (capped)
The chart tells the story in one glance. Vanguard's 0.15% account fee (capped at £375/year above £250,000) wins on portfolios below £17,000. Above that, AJ Bell's £42 cap dominates — and the gap widens with every pound of growth.
Interactive Investor's Core plan at £5.99/month (£71.88/year) stays flat regardless of portfolio size, but the catch: it caps you at £100,000. Cross that threshold and you're bumped to Plus at £14.99/month (£179.88/year). At £100,001, ii costs over four times what AJ Bell charges.
Fidelity's model is tiered: 0.35% below £250,000 on funds (with a £7.50/month flat fee on share holdings, capped at £90/year), dropping to 0.20% above £250,000. The ace: a £2,000 annual cap across all personal accounts. For very large portfolios, that single cap beats AJ Bell's per-account approach.
HL at 0.35% uncapped charges £350/year on a £100,000 ISA — over eight times AJ Bell's £42. Free regular investing on both platforms makes the platform fee gap the entire story.
For the definitive breakdown of flat-fee vs percentage-fee platforms, our platform fee comparison runs the exact maths for every portfolio size.