Interactive investor bonds work best for a UK resident building a gilt ladder inside an ISA or SIPP: one flat monthly subscription from £5.99 covers all wrappers, and online bond deals cost £3.99. The defining limitation is a sterling-only shelf of just 88 bonds with no screener and no yield tools.
interactive investor feels less like a bond broker and more like a low-cost home for UK tax wrappers that happens to deal gilts cheaply. Its strength is narrow but real — safe, inexpensive sterling government dealing inside an ISA or SIPP — and its weakness is everything outside that lane. Here is what works, what doesn’t, and who it is (and isn’t) for.
interactive investor began in 1995 as a financial-information website and grew into one of the UK’s largest do-it-yourself investment platforms, largely by acquisition: TD Direct Investing in 2017, The Share Centre in 2020 and the EQi retail book in 2021. In May 2022 the business was bought by abrdn — now Aberdeen Group plc, the London-listed asset manager — for around £1.5 billion, giving the platform a large, listed parent. It is headquartered in Manchester and serves several hundred thousand UK customers.
The regulated entity is Interactive Investor Services Limited, authorised and regulated by the Financial Conduct Authority (FCA). Client money and assets sit under FCA CASS segregation rules, and the Financial Services Compensation Scheme covers eligible claims up to £85,000 per person — on cash held with the firm’s panel of UK deposit banks, and separately on securities if the firm fails and segregation has broken down. The public record shows no material enforcement action against the firm.
Commercially, the platform’s signature is the flat fee. Where most UK rivals charge a percentage of assets, interactive investor charges a fixed monthly subscription — a model it repriced in February 2026 into three plans (Core, Plus, Premium) that each cover an ISA, a SIPP and a general Trading Account under one fee.
Bonds are dealt through the platform’s standard quote-and-deal flow on the London Stock Exchange — a single venue — with the most popular lines tradeable online and the rest by phone. The stated shelf is 88 bonds: 68 UK government gilts and 20 corporate bonds, all sterling-denominated. On the Bondfish band scale a sub-100 count is the bottom band; by comparison, Interactive Brokers and Saxo Bank quote inventories in the tens of thousands across dozens of currencies, and Trade Republic offers several hundred bonds from €1, including access to US Treasuries.
Within its narrow lane, access is genuinely retail-friendly. Gilts deal in £100 nominal increments, so a small investor can spread a modest sum across the whole curve. interactive investor also gives retail customers access to selected new gilts at Debt Management Office auctions — no dealing fee, no bid-offer spread — a structural edge few UK platforms match.
The binding constraint is everything else: no euro or dollar bonds, no supranationals, and a corporate shelf of 20 lines that functions as a token offering rather than a market. Where a broker like Interactive Brokers competes on breadth and Trade Republic on accessibility, interactive investor competes only on cost and safety within sterling government paper.
The subscription runs £5.99 a month (Core, portfolios up to £100,000), £14.99 (Plus, no limit — accounts are auto-upgraded past £100,000) or £39.99 (Premium). Online bond and gilt deals cost £3.99 on Core and Plus and £2.99 on Premium. There are no percentage custody fees and no inactivity fees; the fee schedule is published in full on the platform’s website in simple, all-inclusive form.
Because dealing is flat, the economics improve sharply with ticket size and deteriorate for small accounts:
| Trade size | Online deal (Core/Plus) | Cost as % of trade |
|---|---|---|
| £1,000 | £3.99 | 0.40% |
| £10,000 | £3.99 | 0.04% |
| £20,000 | £3.99 | 0.02% |
On large sterling tickets, that flat £3.99 is hard to beat among UK platforms. The honest asterisk is the subscription itself: £71.88 a year of Core is about 0.7% on a £10,000 portfolio, so small accounts pay proportionally heavy costs for the privilege of cheap dealing. On small tickets, Trade Republic’s €1 flat deal is far cheaper. Currency conversion — largely irrelevant for an all-sterling shelf — costs 0.75% on Core, expensive by the Bondfish methodology’s anchors.
Flat pricing rewards size and punishes small balances — the same £3.99 deal is a rounding error on £20,000 and a real drag under £5,000.
The platform itself — web plus iOS and Android apps — is one of the better-reviewed in the UK market, and independent reviewers consistently rate the core dealing experience and app quality highly. Bonds can be found by name or ISIN and dealt in a quote-and-deal flow with real-time pricing on online-enabled lines.
The fixed-income tooling is the candid weak spot. There is no bond screener: no filtering by yield, maturity, credit rating or lot size — with 88 lines, the platform evidently assumes browsing suffices. Quote screens show price, not yield-to-maturity, duration or spread, so investors must bring their own bond maths. Some lines deal only by phone.
For an investor who wants to compare bonds analytically before buying, the platform offers little; for one who already knows which gilt they want, it is quick and painless.
Safety is the strongest category: a top-tier regulator (FCA), full CASS segregation of client assets, a brand with three decades of history and a clean enforcement record, and a large listed parent in Aberdeen Group plc.
Protection splits into two layers worth keeping separate:
The one anchor missed is a banking licence — interactive investor is a platform, not a bank — though the panel-bank structure partly compensates by diversifying deposit cover across institutions. At roughly €98,000, the FSCS limit sits marginally under the €100,000 benchmark used across the EU, a nuance rather than a red flag for a firm this well regulated.
Uninvested cash earns tiered interest on all accounts: from 6 January 2026, up to 1.81% AER in the Trading Account, up to 2.12% in the ISA and up to 2.32% in the SIPP. Measured against the Bank of England base rate of 3.75% (held 30 July 2026), these are unremarkable — bond investors holding large cash balances between ladder rungs pay a real opportunity cost.
Onboarding is UK-only but fully online and fast, and support runs by phone and chat, rated well by independent reviewers. Education is a genuine strength for fixed income specifically: a weekly Bond Watch column, gilt-ladder guides and auction explainers, rare among UK mainstream platforms.
Tax support is excellent for UK residents: ISA and SIPP wrappers under the flat fee and a consolidated tax certificate for taxable accounts. There is no multi-country localisation beyond that, so the benefit is entirely tied to UK residency.
The right fit is a UK resident building a gilt ladder inside a tax wrapper. Take an investor with a £150,000 SIPP who wants £10,000 nominal in each of five gilts maturing 2027–2031: five online deals cost about £20 in total, the £14.99 monthly Plus fee covers the SIPP, an ISA and a trading account, coupons arrive gross inside the wrapper, and FSCS plus CASS segregation stand behind the lot. For that job, the platform is cheap, safe and quick.
The poor fit is anyone whose bond investing extends beyond sterling government paper. Twenty corporate lines is not a market; there are no EUR or USD bonds, no supranationals, no fractionals below £100 nominal, no screener and no yield analytics. Non-UK residents cannot open an account. And small portfolios — under roughly £20,000 — pay proportionally heavy subscription costs for the privilege of cheap dealing.
How it stacks up when the requirement changes:
| If you want… | Best fit |
|---|---|
| Cheap, safe UK gilt ladder inside an ISA or SIPP | interactive investor |
| Tens of thousands of bonds across dozens of currencies at low commission | Interactive Brokers |
| Multi-market exchange and OTC bond connectivity | Saxo Bank |
| Fractional bond dealing from €1, including US Treasuries | Trade Republic |
Bondfish complements your broker by screening the full universe of bonds available across major brokers and helping you identify the best opportunities through independent analysis. A concrete example interactive investor cannot answer: how does the yield on a 2031 gilt compare with a 2031 EUR supranational or a same-maturity US Treasury — and which broker actually carries each?
interactive investor is a cheap, safe, tax-efficient home for a sterling gilt ladder: flat pricing, top-tier FCA regulation and FSCS cover on both cash and securities make it hard to beat for a UK resident dealing gilts inside an ISA or SIPP. Its ceiling is just as clear — 88 sterling-only lines, no euro or dollar bonds, no screener and no yield analytics. Choose it if you know which UK gilt you want; look elsewhere if you want breadth, currencies or analytical tools.
This article is for general information only and is not investment advice. Bond investing involves risk, including possible loss of principal. Figures such as bond counts, fees, interest rates and protection limits can change — verify current terms with the broker before investing. Consider your own circumstances or consult a licensed financial professional before investing.