Both are FCA regulated and FSCS protected. The real differences are fees, investment range and how each platform feels to use. Here is the honest comparison.
Fees verified July 2026. Capital at risk. Information, not financial advice.
Active investors who want professional tools alongside long-term holdings.
Portfolios above roughly £60k where a flat fee beats percentage charges.
| Fee | IG | Interactive Investor |
|---|---|---|
| Platform fee | £0 (custody fee removed January 2026) | Core £5.99/month (up to £100k); Plus £14.99/month (no limit); Premium £39.99/month |
| Share dealing | £0 commission with instant currency conversion | £3.99 per trade (£2.99 on Premium) |
| Fund dealing | Not available (shares and ETFs only) | £3.99 per trade (£2.99 on Premium) |
| FX fee | 0.7% | 1.5% on the first £25k, tiered lower above |
| Stocks & Shares ISA | Free | Included in the monthly plan |
| SIPP | Available, third-party administration fees apply | Included in the monthly plan |
| Withdrawals | Free | Free |
| Minimum to start | No minimum | No minimum (£25/month for regular investing) |
Experienced traders rate the platform quality, charting and market access.
Lower scores than rivals, with complaints about account queries and the complexity of the product range.
Read IG reviews on TrustpilotLong-standing customers value the flat fee and the breadth of investments.
The 1.5% headline FX fee and occasional platform outages are the recurring complaints.
Read Interactive Investor reviews on TrustpilotIG is best known for trading, but its share dealing account and ISA became far more competitive in 2026 when it removed custody fees and commissions. You get institutional-quality tools with no platform charge.
The 0.7% currency conversion fee is the main cost to watch on US shares, and there are no traditional funds. It suits confident investors; beginners will find simpler homes elsewhere.
Interactive Investor charges a flat monthly subscription instead of a percentage. On a £200,000 portfolio, £5.99 a month is a fraction of what percentage-fee platforms charge, which is why ii keeps winning larger DIY investors.
The equation flips for small pots: £71.88 a year on £10,000 is 0.7%, more than almost any rival. Work out your portfolio size first, then decide.
A 0.2% fee difference is worth optimising. Knowing whether you are saving enough in the first place is worth far more. Delphina models your pensions, ISAs and investments and tells you where you actually stand.