The announcement around ISAs limits in the November Budget and the subsequent details published by HMRC will have far-reaching consequences, says Joshua Croft, senior technical consultant at AJ Bell.
The chancellor’s recent Budget announcement confirmed significant changes to the ISA framework that will take effect from the 2027/28 tax year. The most notable reform is the reduction of the Cash ISA subscription limit for those under 65 to £12,000, while the overall annual ISA allowance remains at £20,000. In addition, all ISA subscription limits will be frozen until 5 April 2031, extending the freeze for another four years.
This freeze means the main adult ISA limit, first set at £20,000 in 2017/18, will remain unchanged for 14 years. Had the limit been inflation-linked, it would now be around £27,500, highlighting the impact of inflation on the real value of tax-free savings.
What has been announced?
Further details published by HMRC outline several significant changes that will also come into effect from 6 April 2027. For investors under 65, transfers from Stocks & Shares or Innovative Finance ISAs to Cash ISAs will no longer be permitted. New eligibility tests will be introduced to determine whether an investment qualifies for a Stocks & Shares ISA or is considered ‘cash-like’. Additionally, a charge will apply to interest earned on cash held within Stocks & Shares or Innovative Finance ISAs, though the rate is yet to be confirmed.
The government has promised a consultation on draft legislation, with amendments to ISA regulations promised well ahead of April 2027. There is also an indication that pre-2027 investments may be subject to new restrictions, which could require clear tracking of subscriptions before and after the rule change.
Implications for clients
These changes will have far-reaching consequences. For savers under 65, the reduction in the Cash ISA limit from £20,000 to £12,000 represents a significant cut in the amount that can be sheltered from tax in low-risk, cash-based investments. Those who wish to maintain the full £20,000 tax-free allowance may need to consider Stocks & Shares ISAs, which retain their current limit. This shift from cash to investments introduces greater exposure to market risk, so suitability and risk tolerance will need careful consideration. The introduction of eligibility tests on investments and charges on cash held within these ISAs means it will be the ISA manager’s responsibility to oversee compliance and ensure all requirements are met.
The freeze on ISA allowances until 2031 adds another layer of complexity. Over time, inflation will erode the real value of these limits, making it more important than ever to maximize allowances while they remain at current levels. For those aged 65 and over, the full £20,000 Cash ISA limit will continue to apply, offering a valuable advantage for retirement planning.
Another area to watch is the planned reform of the Lifetime ISA. A consultation in early 2026 will explore the introduction of a new, simpler ISA product aimed at helping first-time buyers purchase a home. Once implemented, this product will replace the Lifetime ISA, potentially reshaping home-buying strategies. However, existing Lifetime ISAs will likely remain available for some time after the new product is introduced, so it won’t disappear immediately.
What should clients and advisers do now?
The immediate priority is to review current ISA strategies. Advisers should consider whether it is appropriate for clients to make full use of their existing Cash ISA allowances in both the current tax year and 2026/27, before the new limits take effect. This approach may suit some clients, but it will not be right for everyone. Portfolio allocations should also be revisited to ensure they align with the forthcoming changes, particularly for those holding cash-like investments within Stocks & Shares ISAs. Finally, staying informed on legislative updates will be essential as the consultation process unfolds.
