Best Stocks & Shares ISA Providers UK 2026: Compare Fees, Investment Options & Minimum Deposits
An objective, data-led comparison of eight leading platforms — with an interactive cost calculator to find the cheapest provider for your portfolio size.
With the dividend allowance stuck at £500 and capital gains tax applying from £3,000, the ISA wrapper has never mattered more. But the platform you choose determines how much of your return you actually keep — a 0.45% annual fee on a £100,000 portfolio costs £450 per year before a single trade is placed.
This guide covers the eight most widely used Stocks & Shares ISA providers in the UK as of June 2026. Each entry covers the fee structure, investment universe, minimum deposit, and a plain-English verdict on who it suits best.
The 8 best Stocks & Shares ISA providers for 2026
Vanguard’s platform is deliberately narrow: it offers only its own funds, ETFs, and LifeStrategy portfolios. There is no access to individual shares, competitor funds, or gilts. For investors pursuing a simple index-tracking strategy — particularly those using Global All-Cap, FTSE All-World, or a LifeStrategy fund — this simplicity is a feature, not a limitation. The 0.15% fee and £375/year cap is the lowest percentage-based cost for any mainstream provider below the £250,000 threshold.
AJ Bell is a publicly listed, FTSE 250 business and one of the UK’s most trusted investment platforms. Its fee structure rewards ETF and share investors specifically — the £3.50/month cap on the platform fee for exchange-traded assets works out to just £42/year, making it extremely competitive for portfolios built primarily on ETFs or UK equities. The fund dealing fee of £1.50 is also lower than most rivals.
Interactive Investor is the UK’s second-largest direct-to-consumer investment platform. Its flat-fee model is the critical differentiator: at £4.99/month (approximately £60/year), larger portfolios pay the same as small ones. This means the effective fee percentage shrinks as your portfolio grows. At £50,000 the annual cost is around 0.12%; at £100,000 it drops to 0.06% — far below any percentage-based rival. ii includes access to 40,000+ global instruments across 17 international exchanges.
InvestEngine has no platform fee and no dealing charges for its DIY ISA — the only cost is the underlying ETF’s ongoing charge figure (OCF), which is unavoidable regardless of platform. The platform also offers fractional ETF investing, meaning 100% of deposited capital is deployed immediately with no uninvested cash drag. A managed portfolio option is available at 0.25%, but the DIY route is genuinely fee-free.
Trading 212 charges zero commission and no platform fee, with a £1 minimum investment and fractional share access. The primary cost for most users is the 0.15% foreign exchange fee applied when buying non-GBP assets — which affects US stocks (Apple, Microsoft, Tesla etc.) and many ETFs priced in USD or EUR. For a buy-and-hold investor purchasing £10,000 of US stocks once, the FX cost is £15 — comparable to two trades on HL. For frequent traders, it accumulates. The app experience is among the best in the market.
iWeb is operated by Halifax Share Dealing, part of Lloyds Banking Group — one of the most stable financial institutions in the UK. It charges no annual platform fee, making it extraordinary for investors who buy a diversified portfolio once a year and never touch it. The one-off account setup fee and £5 per trade mean that low-activity investors pay almost nothing in platform costs. The interface is dated and the app is basic, but the underlying security and fee structure are hard to beat for a “buy once, hold forever” strategy.
Hargreaves Lansdown is the UK’s largest retail investment platform by assets under administration, and that scale shows in its research, tooling, and customer service. The “Wealth Shortlist” of curated funds is genuinely useful, the app is polished, and telephone support is UK-based and responsive. However, its 0.45% platform fee and £11.95 dealing charge are the highest on this list. HL did revise its fee tiers in 2026 but remains materially more expensive than rivals for portfolios over £30,000.
Fidelity is one of the world’s largest asset managers and its direct-to-consumer platform benefits from that institutional-grade backing. The platform fee is capped at £45/year for share and ETF investors, which is competitive. Fund dealing is free. The research suite and fund analytics are particularly strong — Fidelity’s own fund range and star ratings are well-regarded. The higher £1,000 lump sum minimum is a barrier for new investors but reflects Fidelity’s positioning toward more established savers.
2026 ISA provider comparison table
Key metrics at a glance. Scroll horizontally on mobile.
| Provider | Platform fee | Dealing fee | Min. deposit | Asset types | Best suited to |
|---|---|---|---|---|---|
| Vanguard | 0.15% (max £375) | £0 (funds only) | £500 / £100/mo | Vanguard funds only | Passive index investors |
| AJ Bell | 0.25% (max £3.50/mo ETFs) | £5.00 shares / £1.50 funds | £500 / £25/mo | Funds, ETFs, shares, gilts | Active-passive mix, mid-size |
| Interactive Investor | £4.99–£14.99/mo (flat) | 1 free/mo then £3.99 | £25/mo | 40,000+ global instruments | Portfolios over £30,000 |
| InvestEngine | £0 (DIY) | £0 | £100 / £25/mo | ETFs only (700+) | ETF-only investors |
| Trading 212 | £0 | £0 (0.15% FX) | £1 | 10,000+ stocks & ETFs | Active traders, new investors |
| iWeb | £0 | £5.00 | £0 (setup fee) | Funds, ETFs, shares | Large static portfolios |
| Hargreaves Lansdown | 0.45% (tiered) | £11.95 | £100 / £25/mo | 15,000+ instruments | Beginners, research users |
| Fidelity | 0.35% (max £45/yr shares) | £7.50 shares / £0 funds | £1,000 / £25/mo | 4,000+ funds, ETFs, shares | Fund investors, mid-size pots |
Interactive ISA cost calculator
Enter your portfolio size and annual trading activity to compare the true annual platform cost across all eight providers.
* Estimates only. Trading 212 FX fee calculated at 0.15% of total portfolio for US/non-GBP stocks. Platform fee caps and tiering applied where specified. Dealing fees exclude stamp duty. Always verify current fee schedules directly with providers before investing.
How to choose the right ISA provider
The “best” platform depends on three variables: your portfolio size, how often you trade, and what you invest in. Here is a simple framework:
The hidden cost of FX fees
Platforms like Trading 212 and Freetrade charge zero commission but apply a 0.15%–0.50% foreign exchange fee on non-GBP assets. For a single £10,000 purchase of US equities at 0.15%, the FX cost is £15 — roughly comparable to one trade on a traditional platform. Where it differs: the FX fee applies on every purchase and every sale, so a round-trip on £10,000 of US stocks costs £30. For large, infrequent trades, a flat dealing fee can be cheaper.
The £20,000 annual ISA allowance: multi-provider flexibility from 2024
Since April 2024, HMRC rules permit UK investors to hold multiple ISAs of the same type simultaneously. You can split your £20,000 annual allowance across, for example, a Vanguard ISA and an Interactive Investor ISA in the same tax year. This change removed a significant restriction and allows investors to use specialist platforms for different asset classes without consolidating everything.
See the long-term impact of fees
Our ISA Fees Impact Calculator shows how even a 0.1% annual fee difference compounds over 20+ years — the results are often surprising.
Try the ISA Fees Impact Calculator →Not sure which type of ISA to open first?
Our “Which ISA Is Right for Me?” tool walks you through Cash ISA, Stocks & Shares ISA, Lifetime ISA, and Junior ISA options based on your goals.
Take the ISA selector quiz →2026/27 ISA rules and allowance
The ISA annual subscription limit for 2026/27 is £20,000 per person. Key rules to know:
- You can split the £20,000 across multiple ISA types in the same tax year.
- Since April 2024, you can open and contribute to more than one ISA of the same type per tax year.
- Unused allowance cannot be carried over to the next tax year.
- Returns within an ISA — dividends, interest, and capital gains — are entirely tax-free.
- The Lifetime ISA has a separate £4,000 annual limit (included within the overall £20,000 cap) with a 25% government bonus.
- Junior ISAs have a separate £9,000 annual limit, unaffected by the adult ISA allowance.
