Portfolio size
£50,000
£1k£500k
Account type
Investing in
Annual cost across portfolio sizes
Your portfolio: £50,000
Fee table at key portfolio sizes (ISA · Funds)
| Portfolio | Interactive Investor | Vanguard | Cheaper |
|---|
Monthly trading assumed. Verify fees at source before switching.
Features comparison
| Feature | Interactive Investor | Vanguard |
|---|---|---|
| Invests in | Funds, Etfs, Shares, Investment_trusts, Bonds, Gilts | Funds, Etfs |
| Stocks & Shares ISA | ✓ | ✓ |
| SIPP | ✓ | ✓ |
| GIA | ✓ | ✓ |
| Junior ISA | ✓ | ✓ |
| Flexible ISA | ✗ | ✗ |
| Fractional shares | ✗ | ✗ |
| Regular investing | ✓ | ✓ |
| Mobile app | ✓ | ✓ |
| FSCS protected | ✓ | ✓ |
| Founded | 1995 | 1975 |
Verdict
Choose Interactive Investor if…
Investors with larger portfolios (£50,000+) where the flat £11.99/month fee becomes very competitive versus percentage-based rivals. Each plan includes one free trade per month — additional trades are £5.99.
Choose Vanguard if…
Passive investors who are happy using Vanguard's own fund range. At 0.15% with a £375/yr cap it's very competitive for portfolios up to £250,000 — and it's a trusted, household-name brand.
Use the calculator above to find the cheapest option for your specific portfolio size and investing style.
Affiliate links — we may earn a commission at no cost to you. Rankings based on fees only.
Related comparisons
Interactive Investor vs AJ Bell
Vanguard vs AJ BellInteractive Investor vs Fidelity
Vanguard vs FidelityInteractive Investor vs Freetrade
Vanguard vs FreetradeInteractive Investor vs Hargreaves Lansdown
Vanguard vs Hargreaves LansdownInteractive Investor vs InvestEngine
Vanguard vs InvestEngineInteractive Investor vs Trading 212
Vanguard vs Trading 212