The British ISA (UK ISA) that did not go ahead

There is no British ISA and there never was one to open. The idea, also called a UK ISA, was a proposed extra £5,000 a year of tax-free allowance on top of the existing £20,000 ISA allowance, usable only for UK-based assets¹. It was floated in 2024 and then shelved, so no provider ever offered an account and no saver ever held one².

What you can use instead is the ordinary ISA allowance: £20,000 per tax year, unchanged, and confirmed to stay at £20,000 from 6 April 2027³. Within that, a stocks and shares ISA can already hold UK shares, funds, investment trusts and exchange traded funds, so the main thing the British ISA would have added was extra room, not access to UK companies⁴.

This page sets out what the British ISA would have been, which investments would have qualified, why it did not go ahead, and how to hold UK investments inside the ISAs that do exist. It also covers the Help to Buy ISA bonus deadline, which is the nearest live deadline for savers who held one of the older government-backed accounts.

An extra £5,000 allowance on top of the £20,000 ISA limit

The British ISA was designed as an additional allowance, not a replacement. Savers would have had their usual £20,000 overall ISA limit plus a separate £5,000 annual allowance that could only be used for UK-based assets¹. The Resolution Foundation, which examined the proposal, described it as a product with "its own £5,000 annual allowance in addition to the existing £20,000 annual ISA allowance"¹.

That structure matters because it would have changed how much a saver could shelter from tax in total. Under the current rules the overall ISA limit is £20,000 per tax year, and it applies across all the ISAs held in your name rather than per account⁷. The £20,000 figure has been the overall subscription limit since 2017, when it rose from £15,240⁸. Before that it was £15,000 from 2014⁹.

The British ISA would have sat alongside the four main types of adult ISA: cash ISAs, stocks and shares ISAs, Innovative Finance ISAs and Lifetime ISAs⁶. It would not have replaced any of them. The £5,000 would have been extra room, ring-fenced for UK assets, and the £20,000 would have carried on working as it does now.

For a saver, the practical effect would have been a higher ceiling on tax-free saving, but only for money placed in UK-focused investments. Anyone who wanted to hold global funds, or who simply wanted more cash ISA room, would have gained nothing from it. That narrowness is one of the reasons the proposal attracted criticism, including from the Building Societies Association, which warned that ISA reforms of this kind could undermine investment aims¹⁰.

Which investments would have qualified

The British ISA was described as effectively a stocks and shares ISA for UK-listed companies only¹¹. That is the clearest statement of its scope: it would have been an investment account, not a cash account, and the investments inside it would have had to be UK-listed.

The rules for what a stocks and shares ISA can hold give a good picture of the shape of it. Only shares listed on a recognised stock exchange or traded on an Alternative Investment Market can be held in an ISA⁴. Shares must be acquired through a public offer and cannot, other than in prescribed circumstances, be bought before listing or admission to trading¹². Only authorised or recognised funds may be held in a stocks and shares ISA under current law¹³.

What a stocks and shares ISA can hold includes unit trusts, investment trusts, open-ended investment companies, shares held in an ISA, and foreign shares listed on the London Stock Exchange⁴. Shares listed on a foreign stock exchange can also be held in an ISA⁴. Direct property investments cannot be held in a stocks and shares ISA¹⁴.

A UK-focused version would have narrowed that list to UK-listed shares and UK-based assets. The exact qualifying list was never finalised in rules, because the product was not taken forward. What is clear from the proposal is the direction: UK-listed equities and UK-based investments, held in an investment account, with the extra £5,000 allowance attached.

Why the British ISA was dropped

The British ISA was previously shelved, and reporting in October 2025 said Treasury officials were also said to be weighing up its return². That is the state of play: not launched, not formally abolished by a single announcement, but not proceeding either. No rules were made to create it, so no provider could offer one.

The wider ISA policy picture has moved in a different direction. The government has announced a review of ISAs, and it has not implemented a cap on the amount savers can put into cash ISAs¹⁵. A cap on cash ISA saving had been discussed as an alternative reform, and the Building Societies Association warned against a cut in the annual cash ISA limit from £20,000 to £5,000¹⁰. Instead, the change that has been set out is a reduction in the cash ISA limit to £12,000 for savers aged 65 and under, within the overall £20,000 limit, from April 2027⁵.

There has also been scrutiny of whether ISA products deliver value for the money spent on them. A parliamentary committee concluded that the Lifetime ISA may not be the most efficient use of taxpayers' money to achieve its disparate objectives. That kind of finding makes an extra allowance for a new product a harder case to argue.

For a saver, the practical consequence is simple. There is no British ISA to open, no deadline to miss, and no allowance to lose. The ISA rules that apply are the ones already in force, and the changes coming in April 2027 concern the cash ISA limit and transfers between ISA types, not a new UK-only account.

The ISA allowance you can use instead: £20,000 a year

The allowance that exists is £20,000 per tax year, and it applies across all the ISAs held in your name rather than per account⁷. Official guidance confirms the overall ISA limit stays at £20,000 from 6 April 2027³. The annual ISA allowance is currently £20,000 per tax year, and the overall annual ISA subscription limit is subject to change every year (currently £20,000)⁸.

From April 2027 the shape of that £20,000 changes for cash savers. The annual ISA cash limit will be set at £12,000, within the overall annual ISA limit of £20,000, for savers aged 65 and under, while savers over 65 retain £20,000⁵. The limits for Innovative Finance ISAs, Lifetime ISAs and stocks and shares ISAs remain the same³. The stocks and shares ISA limit is remaining at 20k¹⁶.

One further change affects how money moves between ISA types. Transfers from non-cash ISAs into cash ISAs will not be permitted from 6 April 2027¹⁷. Reporting described this as a ban on transfers from stocks and shares ISAs to cash ISAs¹⁶. The existing transfer rules are that funds invested in a stocks and shares ISA can only be transferred to another stocks and shares ISA, while funds in a cash ISA can be transferred to a stocks and shares ISA or another cash ISA⁶.

If you are working out how much room you have, the allowance is per person, not per household, and it resets each tax year. Unused allowance does not carry over. For the current year and past years, the ISA allowance page sets out the figures.

Ways to invest in UK companies within an existing ISA

You do not need a British ISA to hold UK companies. A stocks and shares ISA can be invested in UK and overseas shares, bonds, funds, exchange traded funds and investment trusts⁴. That means UK-listed shares sit comfortably inside an ordinary ISA, alongside global funds if you want them.

The rules on what can be held are specific. Only shares listed on a recognised stock exchange or traded on an Alternative Investment Market can be held in an ISA⁴. Shares must be acquired via a public offer and cannot, other than in prescribed circumstances, be acquired before listing or admission to trading¹². Only authorised or recognised funds may be held in a stocks and shares ISA under current law¹³. Direct property investments cannot be held¹⁴.

There are also rules on cash sitting inside an investment ISA. Investments judged to be cash-like will not be permitted in stocks and shares ISAs from 6 April 2027¹⁸. For inheritance tax valuations, any uninvested cash held in the ISA must be included, but other cash or insurance policies held in an ISA are not included with the value of the shares⁴.

If you already hold UK shares outside an ISA, moving them in is a separate process with its own rules. The bed and ISA page explains how that works, and the eligible investments page lists what a stocks and shares ISA can hold in more detail.

Stocks and shares ISA or cash ISA: how each one works

The two main types of adult ISA behave very differently, and the choice between them is about risk as much as return.

A cash ISA is a savings account. The money you put in cannot go down, and it is not subject to the risks of investing in stocks and shares¹⁹. It suits money you may need at short notice or cannot afford to see fall in value. A stocks and shares ISA holds investments, so its value can rise and fall, and you can lose money.

The transfer rules differ by type. Funds invested in a stocks and shares ISA can only be transferred to another stocks and shares ISA, while funds in a cash ISA can be transferred to a stocks and shares ISA or another cash ISA⁶. From 6 April 2027, transfers from non-cash ISAs into cash ISAs will not be permitted¹⁷.

For a fuller comparison, the cash ISA vs stocks and shares ISA page sets the two side by side, and the stocks and shares ISAs explained page covers how investment ISAs work in practice.

What happens to my Help to Buy ISA bonus, and when is the claim deadline

The Help to Buy ISA is the older government-backed account with a live deadline, and it is worth checking if you hold one. The scheme was launched on 1 December 2015 with accounts available through banks, building societies and other providers⁶. It closed to new accounts on 30 November 2019, though account holders can continue saving into it⁶.

The bonus must be claimed by 1 December 2030⁶. The bonus applies to both the amount saved into the Help to Buy ISA and the interest built up during the period the account is open²⁰. Existing holders can continue paying into their account until 30 November 2029, after which it is no longer possible⁶.

The Help to Buy ISA is no longer available to open, and the scheme has ended for new savers²¹. If you hold one, the deadline is the thing to diarise. The Help to Buy ISA page covers the scheme in full, and the cancelling and cooling-off page covers Help to Buy ISA deadlines alongside other ISA timing rules.

Where to get help with ISAs and investing

If you are unsure which ISA suits your circumstances, free and impartial guidance is available. MoneyHelper, the government-backed service, provides guidance on savings and investing. For debt problems, debt advice charities offer free help. If you have a complaint about an ISA provider that the firm has not resolved, the Financial Ombudsman Service can look at it.

Complaints about cash ISAs, including cash lifetime ISAs and help to buy ISAs, reached 1,619 in 2025/26²². That figure covers complaints opened with the ombudsman about those products, and it shows that disputes do reach the service. The complaining about an ISA provider page explains how to take a complaint forward, and the how your ISA is protected page covers what protection applies to ISA money.

For the wider picture on tax-free saving, the ISAs: a complete guide page is the starting point, and the types of ISA page sets out each account type. If you are weighing up whether to hold cash or investments, the cash ISA vs savings account page compares a cash ISA with an ordinary savings account.