Interactive Investor Review 2026 — Fees, ISA, Verdict

TL;DR

Interactive Investor (ii) is one of the UK's three biggest direct-to-consumer investment platforms, owned by abrdn since 2022. It uses a flat monthly subscription model — £4.99/mo Investor or £11.99/mo Super Investor — rather than the percentage-based AUM fees of Hargreaves Lansdown and AJ Bell. Standard trades cost £3.99, but regular monthly investments are free, and the Super Investor plan throws in one free trade per month. ii offers full ISA, SIPP, and Junior ISA wrappers with 40,000+ funds, UK and US stocks, and is FSCS-protected up to £85,000 per client. Best for UK investors with £25k+ portfolios who pay less in flat fees than competitors' percentage charges. Worst for small balances under ~£10k where the £60–£144/year fee dominates returns. Verdict: the cheapest UK investment platform at scale, with the best fee economics above £50k. Rates and fees current as of Q1 2026.

Robo-advisor or DIY broker?

Interactive Investor is firmly a DIY investment platform — not a robo-advisor. You pick the funds, ETFs, and stocks; ii holds them in tax wrappers (ISA, SIPP, Junior ISA, or general investment account); you make all the decisions. There is a separate Quick Start Funds range (six pre-picked multi-asset funds) for users who want simplicity, but the platform itself doesn't manage your portfolio.

What makes ii structurally different from continental competitors like Trade Republic or Scalable is the UK tax-wrapper architecture. The ISA (Individual Savings Account) gives a £20,000/year tax-free allowance for any gains, dividends, or interest. The SIPP (Self-Invested Personal Pension) lets you invest pension contributions with up to 45% income tax relief on the way in. These wrappers are uniquely valuable in the UK and don't exist on most EU platforms.

ii operates only in the UK — it is not available to EU residents post-Brexit. This review is for UK residents and expats who retain UK tax residency.

Key facts at a glance

How fees work

ii's flat-fee model is genuinely different from UK competitors:

• Investor plan (£4.99/month) includes one ISA + one general account, free regular monthly investments, ii's research and tools, and £3.99 per trade for standard one-off trades.
• Super Investor (£11.99/month) adds a SIPP (or you can choose to add a Junior ISA), two free trades per month (one regular + one extra), free family member access (up to 5 family members get accounts at no extra cost), and 0% trading on certain funds.
• Pension Builder (£12.99/month) is the SIPP-only plan for users who don't want a stocks/shares ISA on the platform.
• Standard trade: £3.99 (UK shares, US shares, ETFs, funds). Same flat fee regardless of trade size.
• Regular monthly investment: £0 — you set up DCA and trades execute commission-free.
• FX fee: 1.5% on smaller US trades, dropping to 0.25% above £100k. This is significant for active US-stock traders.
• No exit fee, no inactivity fee, no platform percentage fee — the flat subscription is the only platform charge.

This model is meaningfully different from Hargreaves Lansdown's 0.45% AUM fee on funds (which costs £450/year on £100k) and AJ Bell's 0.25% (£250/year on £100k). At £100k, ii Investor costs £60/year — a saving of £190–£390/year vs competitors.

Real-world cost example

Scenario A — £100/month regular investment into a global ETF on the Investor plan, 12 months:

• Plan fee: £59.88
• Regular investment trades: £0 (12 free monthly DCA executions)
• FX (assuming UK-listed ETF): £0
• Total year-1 cost: £59.88

Scenario B — £10,000 lump sum into one UK-listed ETF on the Investor plan, hold 12 months:

• Plan fee: £59.88
• One trade: £3.99
• Total year-1 cost: £63.87 (~0.64%)

Scenario C — £100,000 portfolio across 5 funds + 5 stocks, 1 trade per month average, on Super Investor:

• Plan fee: £143.88
• 12 trades × £3.99 = £47.88, but 12 free trades from Super Investor cover them = £0
• Total year-1 cost: £143.88 (~0.14%)
• Compare HL at 0.45%: £450/year (£306 more)
• Compare AJ Bell at 0.25%: £250/year (£106 more)

For larger portfolios, ii is dramatically cheaper. The crossover is around £25k — below that, the flat fee dominates and percentage-fee competitors are competitive or cheaper.

Investment universe

What you can buy:

• Funds: 40,000+ unit trusts and OEICs from every major UK fund house (Vanguard, Fidelity, BlackRock, Baillie Gifford, Fundsmith, etc.)
• Investment trusts: Full LSE-listed range — particularly relevant in the UK where investment trusts are uniquely popular.
• ETFs: ~3,000, including all major Vanguard, iShares, HSBC, L&G, Invesco UCITS ETFs.
• UK stocks: Full LSE main market + AIM.
• US stocks: NYSE + NASDAQ, including fractional dealing on selected stocks.
• EU stocks: Selected German, French, Italian listings.
• Bonds: Direct gilts and corporate bonds (limited universe), plus all major bond ETFs and funds.
• Quick Start Funds: Six ii-curated multi-asset funds (Vanguard LifeStrategy-style) for hands-off investors.

What you cannot buy: options, futures, individual cryptocurrencies, leveraged CFDs, US-listed ETFs that don't have UCITS equivalents (PRIIPs restriction).

Best for / not for

Best for:

• UK investors with £25,000+ portfolios — fee economics flip strongly in ii's favor
• ISA + SIPP combo users who want both wrappers on one platform
• Family investors — Super Investor's free family accounts save £300+/year vs separate accounts
• Investment trust enthusiasts (UK-specific asset class with deep ii coverage)
• Long-term buy-and-hold investors who use regular monthly investing

Not for:

• UK investors with <£10k portfolios — percentage-based competitors (Vanguard UK at 0.15% capped) are cheaper
• EU residents (not available)
• Active US-stock traders making many small trades (FX fees and £3.99 per trade add up)
• Crypto-focused investors (none offered)
• Day traders or options traders (not the platform's design)

Common pitfalls

1. Plan fee dominates small balances. At £5k invested, £60/year is 1.2% drag — worse than Vanguard UK's 0.15% (£7.50). Don't pick ii until you have meaningful AUM.
2. FX cost on US stocks. 1.5% per US trade FX is invisible inside the trade execution. A £1,000 US share buy costs £15 in FX — far more than the £3.99 commission. Group US trades into larger blocks or use the multi-currency option on Super Investor.
3. Quick Start Funds aren't the cheapest option. The pre-built multi-asset funds work, but Vanguard LifeStrategy bought direct as a fund inside ii is often cheaper and more flexible.
4. ISA allowance reset on April 6. UK tax year ends April 5. Many investors miss the use-it-or-lose-it £20,000 ISA allowance because they don't fund their account before then.
5. SIPP transfer-in delays. Moving an existing SIPP from another provider can take 4–12 weeks, during which you can't trade. Plan around this — particularly if markets are volatile and you want to be in the market continuously.
6. Free regular investment day is fixed. Regular investments execute on the 25th of each month. There is no "buy on dip" customization. Discipline-friendly, but inflexible.
7. Quick Start Funds aren't tax-efficient inside an ISA only. They're fine inside an ISA or SIPP, but in a general investment account they generate dividends taxed at your dividend rate — which can be material at higher AUMs. Wrap into ISA/SIPP wherever the £20k allowance allows.

Alternatives to consider

• Vanguard UK: 0.15% AUM (capped at £375/year), only Vanguard funds, ISA + SIPP available. Cheaper at very small balances; loses to ii above ~£40k.
• Hargreaves Lansdown: 0.45% AUM on funds, 0% on shares with platform fee. Better research and customer service; significantly more expensive at scale.
• AJ Bell: 0.25% AUM, £1.50 regular trades, ISA + SIPP. Middle ground on cost.
• Trading 212 ISA: Free trades, free ISA, free regular investing. Newer entrant; less comprehensive fund range; growing in popularity for low-cost ETF investors.
• InvestEngine (ETF-only): Free DIY ETF investing or 0.25% managed portfolios. ETF-only restriction; no individual stocks.

FAQ

Is Interactive Investor safe?

Interactive Investor is regulated by the FCA and customer assets are protected by FSCS up to £85,000 per person per institution. ii has been operating since 1995 and is owned by abrdn (FTSE 100 asset manager) since 2022, providing strong corporate backing. Customer cash is held in segregated client money accounts at major UK banks.

What's the difference between the Investor and Super Investor plans?

Investor (£4.99/mo) is the basic plan with free regular investing and £3.99 standard trades. Super Investor (£11.99/mo) adds a SIPP, two free trades per month, free family member accounts (up to 5), and access to certain free trading. Many investors find Super Investor pays for itself if they trade 2–3 times per month or want both ISA and SIPP.

Can I transfer my ISA or SIPP from another provider?

Yes — ii supports cash and in-specie transfers from any UK platform. There is no fee from ii's side. The transferring provider may charge an exit fee. Transfer time: 2–4 weeks for ISA (cash), 4–8 weeks for SIPP, longer for in-specie investment trust transfers.

Does ii offer ETFs from outside the UK?

ii offers UCITS-compliant ETFs from major issuers (Vanguard, iShares, HSBC, L&G, Invesco, etc.) — most domiciled in Ireland or Luxembourg. US-domiciled ETFs are restricted under EU/UK PRIIPs rules and not available to retail clients regardless of platform.

How does the SIPP tax relief work on ii?

You contribute up to £60,000/year (or 100% of earnings, whichever is lower). HMRC adds 20% basic rate relief automatically — so a £8,000 contribution becomes £10,000 in your SIPP. Higher-rate (40%) and additional-rate (45%) taxpayers claim the extra relief through self-assessment. ii handles the basic-rate uplift mechanically; the rest is your tax return responsibility.

What about Lifetime ISA — does ii offer one?

No. As of 2026, Interactive Investor does not offer a Lifetime ISA (LISA). For first-home savers under 40 wanting the 25% government bonus, AJ Bell, Hargreaves Lansdown, Moneybox, or Nutmeg are the main UK providers. ii's product range is focused on the standard ISA, SIPP, Junior ISA, and general account.

Can a non-UK resident keep an ii account?

Existing customers who relocate abroad can usually keep their account but can no longer add new money to ISAs (HMRC ISA rules). New ii accounts can only be opened with a UK address and UK National Insurance number. Expats with UK pensions often retain ii SIPPs while abroad — drawdown rules apply per HMRC.

A quick note on tracking

If you split UK pension and ISA savings on ii alongside accounts on a continental broker (Trade Republic for non-ISA-eligible US stocks, for example), Freenance lets you track total household net worth in one dashboard. Many UK investors maintain ii as their tax-wrapper home and a separate broker for crypto or US-only positions; consolidated reporting helps with the annual rebalancing decision.

Verdict

For UK investors with £25k+ portfolios who want ISA, SIPP, and a deep fund universe in one place, Interactive Investor is the most cost-effective mainstream platform in 2026. The flat-fee model that looks expensive at small balances becomes dramatically cheap above £50k — saving hundreds of pounds per year vs Hargreaves Lansdown or AJ Bell. The compromises — UK-only, no crypto, no options, FX cost on US stocks — matter for specific user types. Data shows that the gap between flat-fee and percentage-fee platforms compounds materially over decades; many long-term investors consider this the most underrated structural advantage in UK investing platforms today. The right user is the disciplined UK ISA + SIPP saver building a six-figure portfolio over 10–30 years.

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