What you need to know: Best UK ISA platform for 2026/27
Quick answer: For most UK investors in 2026/27: Trading 212 is cheapest (zero fees), AJ Bell is the best balance of cost and reputation , Vanguard Invest wins on simplicity above £250k , and Hargreaves Lansdown wins on service for those happy to pay for it . Robo-advisors (Nutmeg, Wealthify, Moneyfarm) make sense only…
Key points:
- Picking based on dealing fees if you don t trade. Most long-term investors trade 6 times a year. The £6.95 difference between AJ Bell and HL dealing matters only if you trade weekly.
- Ignoring transfer-out fees. Most UK platforms now offer free transfers (since 2024 regulator pressure), but always verify. Stuck on a platform you can t leave is a real cost.
- Comparing apples to apples. A 0.25% platform + 0.07% ETF OCF = 0.32% all-in. A 0% platform with 1.50% fund OCF is much worse. Always sum platform + fund costs.
For most UK investors in 2026/27: Trading 212 is cheapest (zero fees), AJ Bell is the best balance of cost and reputation, Vanguard Invest wins on simplicity above £250k, and Hargreaves Lansdown wins on service for those happy to pay for it. Robo-advisors (Nutmeg, Wealthify, Moneyfarm) make sense only if the alternative is not investing at all.
The 8 main UK ISA platforms compared
| Platform | Platform fee | Dealing | SIPP? | Best for |
|---|---|---|---|---|
| Trading 212 | 0% | 0% | No | Cost-sensitive, individual stocks |
| InvestEngine | 0% (DIY) / 0.25% (managed) | 0% | Yes (SIPP free) | ETF-only auto-rebalancing |
| Vanguard Invest | 0.15% (capped £375) | £0 funds / £7.50 ETFs | Yes | Large balance, Vanguard ecosystem |
| AJ Bell | 0.25% funds (capped); 0.25% ETFs (capped £42) | £5 (£1.50 regular) | Yes | Balanced cost + service |
| Freetrade | £4.99/mo (Standard); £11.99/mo (Plus) | £0 | Yes (Plus only) | Subscription model, polished app |
| Interactive Investor | £4.99-£21.99/mo (flat) | £3.99/trade (1 free/mo) | Yes | Large balance (flat fee wins) |
| Hargreaves Lansdown | 0.45% funds; 0.45% ETFs (capped £45) | £11.95 (£5.95 regular) | Yes | Premium service, research |
| Nutmeg / Wealthify / Moneyfarm | 0.45-0.95% all-in | included | Yes | Hands-off investors |
Cost over 30 years on a £20,000/year ISA (capped)
Maxing the ISA every year, 7% nominal return, hypothetical fees compounded:
| Platform | 30-year ISA pot | Vs no-fee benchmark |
|---|---|---|
| Trading 212 | ~£2,030,000 | (benchmark) |
| InvestEngine DIY | ~£2,030,000 | (equal) |
| Vanguard Invest | ~£2,005,000 | −£25,000 |
| AJ Bell | ~£1,980,000 | −£50,000 |
| Hargreaves Lansdown | ~£1,910,000 | −£120,000 |
| Nutmeg managed | ~£1,720,000 | −£310,000 |
These numbers assume fund-only holdings with average 0.15% fund OCFs. For ETF-only portfolios with fees capped at most platforms (£42-£45/yr), the gap between Vanguard / AJ Bell / HL shrinks dramatically — they all cost less than £50/yr and the differences become negligible.
Best ISA platform by use case
Best for absolute lowest cost
Best for: Investors who want the cheapest possible ISA regardless of brand
Trading 212. Zero platform fee, zero commission, full UK stock + ETF range, fractional shares, Cash ISA option. The newer platform reputation is the only meaningful downside.
Best for ETF-only investors
Best for: Diversified passive ETF portfolios with auto-rebalancing
InvestEngine DIY. The auto-rebalancing on contributions is the unique feature. 700+ ETFs is enough for any retail strategy.
Best for fund investors below £100k
Best for: Active fund pickers or LifeStrategy-style portfolios
AJ Bell. 0.25% fund fee vs HL's 0.45% saves £200/yr on £100k. Cheaper dealing for occasional trades. Less polish than HL but still well-rated.
Best for ETF investors at scale
Best for: £250k+ portfolios, mainly ETFs
Vanguard Invest. The 0.15% fee capped at £375/yr means costs cap regardless of portfolio size. Above £250k the effective fee drops below 0.15%.
Best for premium service
Best for: Investors who value research, customer support and platform polish
Hargreaves Lansdown. The 0.45% fund fee is a real cost, but the research library and UK call centre rated #1 by Investors Chronicle 2025 justify it for some investors.
Best for £100k+ flat-fee model
Best for: Investors with large ISAs and / or SIPPs who want predictable costs
Interactive Investor. £4.99-£21.99/mo flat fee covers ISA + SIPP across any balance. Wins decisively above £100k portfolios. Trade-off: £3.99 dealing fee per trade after the monthly free trade.
Best for hands-off "set and forget"
Best for: Investors who genuinely won't invest unless someone manages it
Wealthify (0.6% mgmt + 0.16% OCF = 0.76% all-in). Cheaper than Nutmeg/Moneyfarm. The all-in cost is high vs DIY, but if the alternative is staying in cash, it's still a win.
Mistakes to avoid when choosing
- Picking based on dealing fees if you don’t trade. Most long-term investors trade <6 times a year. The £6.95 difference between AJ Bell and HL dealing matters only if you trade weekly.
- Ignoring transfer-out fees. Most UK platforms now offer free transfers (since 2024 regulator pressure), but always verify. Stuck on a platform you can’t leave is a real cost.
- Comparing apples to apples. A 0.25% platform + 0.07% ETF OCF = 0.32% all-in. A 0% platform with 1.50% fund OCF is much worse. Always sum platform + fund costs.
- Falling for “free shares” sign-up bonuses. Most apps offer them. A £10 free share is great but not enough to pick a platform you’ll use for 30 years.
- Forgetting the SIPP question. Many investors eventually want both ISA and SIPP. Trading 212 has no SIPP — meaning a future move is on the cards if you stay there.
Compare specific platforms head-to-head
See the in-depth two-way comparisons: HL vs AJ Bell, Vanguard vs Trading 212, Freetrade vs Trading 212 vs InvestEngine, and the robo-advisor comparison.
Compare HL vs AJ Bell ISA →How we built this comparison
Fee and feature data is taken directly from each provider’s published website as of 2026-05-12. UK Tax Drag has no commercial relationship with any platform listed — no affiliate links, no referral codes, no sponsored content. The methodology page documents our comparison standards. The independence page confirms our funding model.
This page is educational only and is not regulated financial advice. The choice of platform depends on your personal circumstances, investment style, and balance. Always read the provider’s key facts document and verify the latest fees before opening an account. Past performance is not a guide to future returns. Investments can fall as well as rise.
Related
- HL vs AJ Bell ISA — two-way platform comparison
- Vanguard Invest vs Trading 212 — cost vs reputation
- Freetrade vs Trading 212 vs InvestEngine — three-way low-fee
- Nutmeg vs Wealthify vs Moneyfarm — robo-advisor comparison
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