Short answer
Which is cheaper?
For £20,000, Dodl models at £30/year and Vanguard at £48/year. For £50,000, both model at £75/year. Vanguard caps at £375/year; Dodl keeps scaling at 0.15% in this model.
- Below £32k
- Dodl usually wins because Vanguard’s £4/month minimum bites.
- Middle ground
- The providers tie at £50,000 before FX and optional trading details.
- Large portfolios
- Vanguard’s cap matters; Dodl keeps scaling in the model.
Fee model
Platform, dealing and FX fees
| Fee area | Vanguard | Dodl |
|---|---|---|
| Platform/account fee | £4/month below £32,000; then 0.15% capped at £375/year. | 0.15%/year with a £1/month minimum. |
| Dealing fee | £0; optional quote-and-deal ETF fees excluded. | £0 |
| FX fee | £0 | Starting FX band modelled at 0.75% if FX is entered. |
| Investment range | Vanguard funds and ETFs, no individual shares. | Funds, shares and ETFs from Dodl’s limited range. |
| Flexible ISA | Yes | No |
Worked examples
Calculator-backed scenarios
- £20,000 fund ISA, no FX: Vanguard £48; Dodl £30.
- £50,000 fund ISA, no FX: Vanguard £75; Dodl £75.
- £300,000 fund ISA, no FX: Vanguard £375 because of its cap; Dodl £450 in the standard model.
These examples use the same fee assumptions as the main ISA fees calculator. They exclude fund ongoing charges, stamp duty, bid/offer spread, investment performance, and temporary promotions.
Important caveats
Before switching provider
Provider fees can change, and terms can vary by product, plan, transfer route, cash interest policy, and promotion. Verify the provider’s current terms before opening or transferring an ISA.
This page is factual educational content, not personal financial advice or a recommendation to buy, sell, transfer, or choose a specific investment platform.
Sources