There is no single “best” stocks and shares ISA platform. The right choice depends on what you are investing in, how much you will have invested in five years, and how much hand-holding you actually want. This article walks through the platforms worth considering in 2026, the fee structures that decide the eventual cost, and the right pick for each kind of investor.
We have used all of these platforms ourselves. Where there is a recurring trap, we say so.
How platform pricing works
You pay in two places:
- The platform fee—what the broker charges to hold the wrapper.
- The fund or ETF charge (the OCF)—what the fund manager charges to run the fund.
Some platforms add a third layer of trading commissions or FX fees. The total is what matters, not any one number.
The two main pricing models in 2026:
- Percentage-based fees (e.g. 0.15%, 0.25%, 0.45%)—cheapest at small portfolio sizes, expensive at large ones.
- Flat-fee subscriptions (e.g. £4.99–£21.99/month)—can be expensive at small sizes, but pricing is fixed even as your portfolio grows.
The crossover point—where flat-fee becomes cheaper than percentage—sits roughly at £75,000–£100,000 invested.
Platform comparison table
Indicative platform fees, current as of early 2026:
| Platform | Platform fee (funds) | Platform fee (ETFs/shares) | Trading | Notes |
|---|---|---|---|---|
| Vanguard Investor | 0.15% capped at £375/year | 0.15% capped at £375/year | £0 | Vanguard funds and ETFs only |
| InvestEngine | n/a | 0% (DIY) or 0.25% (Managed) | £0 | ETFs only, no funds |
| Trading 212 | n/a | 0% | £0 (FX 0.15%) | ETFs and US shares, mobile-first |
| AJ Bell | 0.25% (capped £42/year on shares ISA) | 0.25% (capped £42/year) | £5 funds, £5 shares | Wide product range |
| Hargreaves Lansdown | 0.45% (capped £45/year on ETFs) | 0.45% (capped £45/year on ETFs) | £0 funds, £11.95 shares | Premium service, broad product |
| Interactive Investor | Flat £4.99/month (Investor Essentials) up to £50k, then £11.99 | Flat | 1 free trade/month | Flat fee dominates at scale |
| Dodl (AJ Bell) | 0.15% (£1/month minimum) | 0.15% | £0 | Stripped-down app from AJ Bell |
| Moneybox | 0.45% + £1/month | 0.45% + £1/month | £0 | App-led, fund-of-funds focus |
This table is indicative and will go out of date—always check the platform’s own fee schedule before opening.
What is actually right for each kind of investor
”I just want one global index fund and a regular contribution”
Pick Vanguard Investor. The 0.15% platform fee, capped at £375/year, plus a 0.20% fund OCF on FTSE Global All Cap, totals 0.35% on small portfolios and converges toward 0.20% as the cap bites. There is no decision-making overhead—you can only buy Vanguard products.
If you specifically want low-cost ETFs from any provider rather than just Vanguard, InvestEngine is the cheapest alternative.
”I want fractional US shares and a slick app”
Pick Trading 212. 0% platform fee, fractional US shares, GBP-USD currency conversion at 0.15%, and a clean mobile experience. The trade-off is that customer service sits behind chat and the platform leans heavily toward retail traders rather than long-term investors.
”I want one platform for fund + share investing across my ISA, SIPP and GIA”
Pick AJ Bell or Hargreaves Lansdown. Both let you hold funds, ETFs, and individual shares in the same place. AJ Bell is meaningfully cheaper on funds (0.25% vs 0.45%), so unless you specifically need HL’s broader research output, AJ Bell wins on cost.
”I have £100,000+ invested already and percentage fees are eating me”
Pick Interactive Investor. A flat £11.99/month at the Investor tier costs about £144/year regardless of portfolio size. The break-even versus AJ Bell is around £58,000. Versus Hargreaves Lansdown it is around £32,000.
If you are transferring in from a percentage-fee platform, II frequently runs cashback offers on transfers above a certain threshold—worth timing the move around.
”I want auto-pilot, with someone choosing the funds for me”
Pick a managed service inside your platform of choice. InvestEngine Managed, Vanguard Lifestrategy, Nutmeg, or Moneyfarm all offer pre-mixed portfolios. Costs run 0.5–0.75% combined.
The trade-off: you pay for the convenience, and the underlying portfolios usually look very similar to a global index fund plus a small bond allocation—which you could replicate yourself for half the price. The convenience is real; the premium is real too.
What the platforms don’t show you on the front page
Three quiet costs to look for:
- Exit fees. Some platforms still charge per-line transfer-out fees (£10–£25 per holding). For a portfolio with 10 funds, that is £100–£250 to leave. Vanguard Investor and AJ Bell are notable for not charging.
- FX spreads. A “0% trading commission” platform that converts GBP to USD at a 1% margin is not actually free.
- Inactivity fees. Rare in 2026 but still on a few legacy platforms.
For a full breakdown of every fee you might encounter, see stocks and shares ISA fees explained.
Switching is easier than people think
If you are already invested with a more expensive platform than you realised, the formal ISA transfer process moves your money without breaking the wrapper. We walk through the steps—and what to do if the old provider drags its feet—in how to transfer a stocks and shares ISA.
The key thing: do not withdraw and re-deposit. Always use the formal transfer process.
Our default recommendations for 2026
If we had to pick one platform per use case, current pricing in mind:
- Beginner with a small monthly contribution—Vanguard Investor.
- ETF-only investor with a moderate portfolio—InvestEngine.
- Mid-portfolio (£25k–£75k) with broad investment needs—AJ Bell.
- Large portfolio (£100k+)—Interactive Investor.
- Mobile-first, fractional shares—Trading 212.
These are not affiliate-led recommendations and the right answer for you may differ. Cost, product range, and customer service trade off differently—what does not change is that the wrong platform can quietly cost you more than the difference between two index funds. Spend half an hour getting it right, and you will not need to think about it again for years.
Frequently asked questions
- Which stocks and shares ISA is cheapest?
For ETF-only investors, InvestEngine and Trading 212 are 0% on the platform fee. For fund investors, Vanguard Investor (0.15%, capped at £375/year) is usually cheapest below £75,000. Above £100,000, Interactive Investor's flat fee model often wins.
- Can I have multiple stocks and shares ISAs?
Yes—since April 2024 you can pay into more than one stocks and shares ISA in the same tax year, as long as your total contributions across all ISAs stay within the £20,000 annual allowance.
- Is my money safe with these platforms?
All UK investment platforms are regulated by the FCA and covered by the Financial Services Compensation Scheme up to £85,000 per institution if the platform fails. Your investments are held in a nominee account, separate from the platform's own funds.
