Key Takeaways:
- Proposed reforms to cash holdings in ISAs are back on the table ahead of the government’s delayed Autumn Budget.
- Investors are already reacting by using up their existing £20,000 allowances in advance of possible changes.
- Skeptics question whether the proposals will achieve many of the government’s aims.
Chancellor Rachel Reeves is reportedly considering reducing the £20,000 ISA allowance to restrict the amount that can be saved in cash, in order to encourage investment in stocks instead.
An overhaul of the ISA rules at the Autumn Budget on Nov. 26 may be touted by Reeves as a way to generate better returns for savers and investors, and it does stand to reshape the UK’s most popular savings vehicle.
Supporters of ISA reform say it’s right the government is looking at ways of fostering growth by encouraging savers to put their money into the UK stock market. Detractors see huge flaws, which they say risk conflating stock market investing with “buying British”. They question whether the proposed changes would prove beneficial for investors, or have the far-reaching economic consequences the government desires.
David Beaston, technical manager at The Investing & Saving Alliance, a financial services and consumer lobby group, says: “Despite the government’s laudable objective of wanting UK savers to move towards more equity-based investing, which could result in superior returns over the medium and longer term, it is TISA’s strong belief that simply reducing the cash ISA limit will not achieve this.”
“TISA believes that individuals need to be encouraged, and not strongarmed, into making more use of stocks and shares ISAs,” Beaston adds.
Investors are reacting to speculation about the potential change to the cash ISA limit by contributing more cash to max-out their existing allowance. According to consumer investment platform Bestinvest, customers have increased their cash ISA contributions by 38% more in September than the previous two-year average for that month. Contributions to self-invested personal pensions have risen by just 3%.
Will Rachel Reeves Change The £20,000 ISA Limit?
Currently, savers and investors can put a maximum of £20,000 into the UK’s suite of ISA products each tax year. They can spread this allowance across cash, stocks and shares products, and innovative finance ISAs or, if eligible, a Lifetime ISA.
In the UK, the majority of ISA savings are held in cash. By creating a separate—and generous, by comparison—stocks and shares allowance, it’s thought the government could encourage more investors to park their money in the UK stock market instead. One argument in favor of a focus on stocks rather than cash is that cash savers are seeing their savings eroded by inflation, which remains elevated, at 3.8% for the 12 months to September 2025.
The government previously considered such a reform, but lobbying from banks and building societies, which stand to lose out from reduced deposits because of the proposed change, reportedly swayed the Treasury’s view in May this year.
Nevertheless, awareness of the limitations of holding cash persists. As Greg B Davies, head of behavioral finance at Oxford Risk, says: “The average investor loses 2%–3% annually from holding too much cash.
“This isn’t a knowledge problem; it’s an emotional unwillingness to move from what feels safe, to what’s suitable. Any policy limiting this psychological crutch will ultimately help investors escape the trap of short-term comfort over building long-term financial resilience and should be applauded.”
Other supportive lobbyists propose abolishing the traditional distinction between cash and stocks and shares wrappers, to create a single product with internal limits for different allocations.
“The current fragmented market is overly-complex and behaviorally illiterate, driving millions of people who could benefit from long-term investing to stick with cash, leaving them vulnerable to the impact of inflation,” says AJ Bell head of public policy Tom Selby.
“Simplifying ISAs by combining the cash and investment versions into a single product is the obvious long-term answer, making the system simpler to navigate and removing barriers between saving and investing.”
How Would ISA Reform Work?
An undoubted air of patriotism also surrounds the plans, sitting alongside policies such as the Mansion House Accord, whose far-reaching consequences for UK pensions will see larger allocations to private markets. But that does not necessarily mean invested ISA money will end up backing British businesses. Some 70%-80% of FTSE 100 revenue comes from abroad, with many multi-nationals among the stocks listed on the UK’s blue-chip index.
Simon Harrington, head of public affairs at the Personal Investment Management & Financial Association, is a skeptic: “It is extremely frustrating that this idea refuses to die,” he says. “UK listing is not an adequate proxy for UK investment. BP does not want your money so it can invest it in London – it wants it to buy oil fields in Jakarta. We should instead focus on the much ‘simpler’ task of making UK citizens richer by helping them access higher long-run returns, regardless of where these might be domiciled.”
What Else Could The Government Do to ISAs?
Changes to the headline ISA allowance are not the only option on the chancellor’s desk. Reeves could also bolster existing reforms announced in July, which include allowing the use of long-term asset funds, or LTAFs, in stocks and shares wrappers.
That will come into effect at the start of the 2026/27 tax year in April. An obvious additional step, many argue, is to abolish 0.5% stamp duty on share purchases within ISA wrappers. This move could come as part of broader changes to the stamp duty rules, also under consideration by the Treasury.
“It is not the role of government to mandate where its citizens invest,” PIMFA’s Harrington says. “If government wants to incentivize people to invest in the UK, make it cheaper to invest here by reforming stamp duty. If the government wants to drive investment in smaller businesses, revisit the curious uneven playing field it has created with business relief.”
