From 6 April 2027 the UK Cash ISA allowance is capped at £12,000. The remaining £8,000 of the annual £20,000 has to go into an investment-ISA wrapper (Stocks and Shares ISA, Innovative Finance ISA, or Lifetime ISA). Most UK savers wanting to deploy the full allowance will be choosing a Stocks and Shares ISA platform either now or in the next ten months.

Four platforms account for most new UK Stocks and Shares ISA opens in 2026/27. At a £50,000 balance held for a year, the platform fee runs:

• Vanguard Personal Investor: £75 (0.15%, capped £375/yr). Vanguard funds and ETFs only
• AJ Bell: £125 (0.25%). full open architecture, £5 share dealing
• Hargreaves Lansdown: £225 (0.45%). full open architecture, £11.95 share dealing
• Wealthify: £380 all-in (0.76%). managed risk-rated portfolio, no DIY pick

The value of investments in a Stocks and Shares ISA can fall as well as rise; you could get back less than you invested. Tax rules can change. The right platform depends on how much you have, what you want to hold, and whether you want to pick investments yourself.

What is the UK Stocks and Shares ISA Allowance for 2026/27, and How is it Changing?

The annual UK ISA allowance for 2026/27 is 20,000 pounds. This total allowance can be distributed across various ISA types: Cash ISA, Stocks and Shares ISA, Innovative Finance ISA, and Lifetime ISA. Lifetime ISA contributions are capped at 4,000 pounds and count within the overall 20,000-pound total.

A Stocks and Shares ISA specifically invests the balance into shares, exchange-traded funds (ETFs), investment trusts, managed funds, and gilts. Returns from these investments depend on market performance. The value of investments in a Stocks and Shares ISA can fall as well as rise, meaning an investor may get back less than they originally invested.

A key change takes effect from 6 April 2027. The Cash ISA portion of the annual allowance will be capped at 12,000 pounds. This means the remaining 8,000 pounds of the total 20,000-pound allowance will only be available for deployment into a Stocks and Shares ISA, Innovative Finance ISA, or Lifetime ISA. This adjustment elevates the practical importance of investment-focused ISA wrappers for savers aiming to use their full annual tax-free allowance.

Which UK Stocks and Shares ISA Platforms Cover the Majority of New Accounts?

Four platforms collectively account for the majority of new account openings and represent the main practical choice for UK investors seeking a tax-free investment wrapper in 2026/27. These are Hargreaves Lansdown, AJ Bell, Vanguard Personal Investor, and Wealthify. Each platform offers a distinct proposition regarding fee structure, investment choice, and dealing charges.

Hargreaves Lansdown (HL) stands as the UK's largest investment platform by assets under administration. AJ Bell follows as the second-largest UK retail investment platform. These two platforms provide extensive investment universes. Vanguard Personal Investor focuses on a specific investment approach, while Wealthify offers a fully managed service.

How do Platform Fees and Investment Choices Compare Across Key Providers?

The four platforms differ on three critical axes: platform fee structure, investment choice, and dealing or fund-buying charges. Understanding these differences is central to platform selection.

Hargreaves Lansdown: Open Architecture with Tiered Fund Fees

Hargreaves Lansdown charges an annual platform fee of 0.45 per cent on fund holdings up to 250,000 pounds. This fee reduces to 0.25 per cent on the next 250,000 pounds (up to 1 million pounds), then 0.10 per cent on holdings between 1 million and 2 million pounds, and 0 per cent above 2 million pounds. For share, ETF and investment-trust holdings, HL caps the platform fee at 45 pounds per account per year. Share-dealing charges are 11.95 pounds per online deal, with this cost reducing based on dealing volume. HL offers an open-architecture platform, meaning investors can choose from a wide range of third-party funds, shares and other securities.

Best fit for: investors who want extensive research, the widest fund choice including active funds, and are willing to pay more for a polished platform. Less competitive on cost above £50,000 of fund holdings.

AJ Bell: Competitive Tiered Fund Fees and Lower Share Dealing

AJ Bell applies a 0.25 per cent annual platform fee on fund holdings up to 500,000 pounds. This fee scales down to 0.10 per cent on amounts between 500,000 pounds and 1 million pounds, 0.05 per cent on 1 million to 2 million pounds, and 0 per cent above 2 million pounds. The platform fee for shares, ETFs and investment trusts is capped at 5 pounds per month, equivalent to 60 pounds per year. Share-dealing charges are 5 pounds per online deal. AJ Bell also provides an open-architecture platform with a broad investment choice.

Best fit for: investors who want open-architecture choice at a lower running cost than HL, and who actively trade shares or ETFs (the £5 dealing charge and £60/yr non-fund cap are both materially cheaper than HL).

Vanguard Personal Investor: Low Fees for Vanguard-Specific Investments

Vanguard Personal Investor charges a 0.15 per cent annual account fee on holdings. This fee is capped at 375 pounds per year. This structure represents one of the lowest published fee rates in the UK retail investment market for index investors. However, Vanguard Personal Investor restricts the investment universe exclusively to Vanguard-branded index funds and ETFs. An investor looking to hold non-Vanguard funds, individual UK shares, or active funds from other managers cannot do so through this wrapper.

Best fit for: buy-and-hold passive investors happy to use Vanguard index funds and ETFs only. The annual fee cap at £375 makes it especially cost-efficient above £250,000 of holdings.

Wealthify: Managed Portfolios with All-Inclusive Pricing

Wealthify, a managed Stocks and Shares ISA service owned by Aviva, operates a different model. It charges a 0.6 per cent annual management fee. On its standard plan, the underlying fund Ongoing Charges Figure (OCF) is approximately 0.16 per cent, leading to an approximate all-in annual cost of 0.76 per cent. Wealthify offers five risk-rated ready-made portfolios, ranging from Cautious to Adventurous, along with an Ethical Plans range. The saver chooses a risk level, and Wealthify manages the underlying investments within the selected portfolio.

Best fit for: savers who want a one-decision managed route (pick a risk level, leave it) and who do not want to pick individual funds. Higher all-in cost than DIY, but lower than Nutmeg and Moneyfarm.

What should you do next?

Compare the four platforms against your situation. Vanguard Personal Investor has the lowest published platform fee but holds Vanguard funds and ETFs only. AJ Bell is materially cheaper than HL on fund holdings and has a hard cap on share and ETF charges. HL costs more but offers the widest research and full open-architecture choice. Wealthify is a managed route for a saver who wants to pick a risk level rather than individual investments. Whichever you pick, you can transfer between providers later without losing the tax-free wrapper (transfer via the new provider, do not withdraw and re-deposit).