HMRC Analysis Suggests Cash ISA Limit Change Will Have Minimal Economic Impact

HM Revenue & Customs (HMRC) analysis suggests that reducing the cash ISA allowance for individuals under 65 will have a negligible impact on the broader economy and stock market. The changes, set to take effect in April 2027, were intended to encourage investment by moving savings from cash ISAs to stocks and shares ISAs.

Under the new rules, savers younger than 65 will be limited to depositing £12,000 annually into a cash ISA, a decrease from the current £20,000. Those aged 65 and older will retain the full £20,000 allowance. Under-65s will still be permitted to invest the remaining £8,000 of their total ISA allowance into a stocks and shares ISA.

Cost and Impact Analysis

HMRC's assessment stated that the reform is "not expected to have a significant macroeconomic impact." While the analysis did not quantify how much money might shift from cash to investments, it did identify potential costs for financial institutions. Isa managers, including banks and investment platforms, are expected to incur one-off costs estimated at approximately £6 million to update their systems, processes, and customer communications.

The Office for Budget Responsibility has yet to review the final costing of the policy. HMRC's data for 2022-2023 indicated that 78% of cash ISA subscribers under 65 deposited less than £12,000, while 22% exceeded this amount.

The changes are also designed to prevent savers from circumventing the lower cash limit by holding large cash balances within stocks and shares ISAs. From April 2027, interest earned on cash held in investment ISAs will be subject to a 22% tax charge. Additionally, money market funds will face new regulations, and transfers from stocks and shares or innovative finance ISAs into cash ISAs will be restricted for those under 65.

Government Rationale and Criticisms

The Treasury stated that the reforms aim to encourage greater investment in stocks and shares, which have historically outperformed cash savings. They emphasized that the overall £20,000 tax-free limit remains generous and that individuals will not be compelled to move existing savings from their cash ISAs. The Treasury also noted that the vast majority of savers will continue to pay no tax on their savings.

Critics, however, have raised concerns that the changes could increase the complexity of the ISA system and negatively affect individuals on lower incomes or those who prefer the security of cash savings.

HMRC itself will incur an estimated £200,000 in costs to update its own technological systems to manage the revised ISA allowance structure. The analysis also noted that individuals aged 55-64 and those 65 or older are proportionally more represented among cash ISA subscribers than in the general adult population.