Proposed Cash ISA Limit Cuts for Savers Under 65

GOV.UK has opened a technical consultation on draft regulations that would cut the annual Cash ISA subscription limit to £12,000 for investors under 65 from 6 April 2027, versus the current £20,000. The proposal leaves the £20,000 Cash ISA limit intact for those aged 65 and over.

This is a material rule change for UK savers who use cash ISAs as a tax-efficient liquidity sleeve. It is not yet a final operating rule: the government is consulting on the draft legislation.

A lower cash allocation ceiling

The draft regulations amend the Individual Savings Account Regulations 1998 and create an age-based split in Cash ISA capacity.

For investors below 65, the proposed £12,000 annual ceiling would reduce the amount that can be newly subscribed to a Cash ISA by £8,000. For those 65 and older, the annual Cash ISA limit would remain £20,000.

The distinction matters because the measure targets the Cash ISA, not ISAs broadly in the wording released by GOV.UK. Investors should therefore separate three questions that are often bundled together:

• how much new cash they expect to shelter;
• whether their current ISA mix includes stocks and shares or innovative finance holdings;
• whether future transfers could be restricted under the draft rules.

The immediate decision is not to reposition capital before the consultation concludes. It is to identify which accounts and planned subscriptions would fall within the under-65 threshold if the regulations take effect as drafted.

Transfers and “cash-like” holdings are in scope

The proposal goes beyond the annual Cash ISA subscription cap. GOV.UK says the draft rules would prohibit transfers from a Stocks & Shares ISA or an Innovative Finance ISA into a Cash ISA where the account holder is under 65.

That restriction would change the mechanics of moving capital between ISA wrappers. A transfer is not the same as a new subscription, but under the draft framework the route from Stocks & Shares or Innovative Finance into Cash would be closed for the affected age group.

The regulations would also define investments treated as “cash-like” and place restrictions on holding them. In addition, they would introduce a charge on interest paid on cash held in Stocks & Shares ISAs and Innovative Finance ISAs.

Those provisions matter as much as the £12,000 headline. A portfolio that uses cash inside an investment ISA for optionality could face a different treatment from a Cash ISA balance. The draft text is aimed at limiting workarounds, not merely lowering a single contribution allowance.

Risk assessment: rules are proposed, not settled

The base case is straightforward: investors under 65 with expected annual cash subscriptions above £12,000 should monitor the consultation and review account structures ahead of April 2027. The key risk is operational rather than market-driven—assuming that cash can still move freely between ISA types after the new regime begins.

For now, the confirmed facts are limited to a technical consultation on draft legislation. The £12,000 limit, transfer prohibition, cash-like investment definition, holding restrictions and interest charge are all elements of that draft framework. Final rules, implementation details and practical treatment by ISA providers remain the items to watch.