Autumn Budget: New £12,000 Cash ISA Cap from 2027
The Autumn Budget introduced a significant reform to Individual Savings Accounts (ISAs), confirming that from April 2027, there will be a new £12,000 annual cap specifically for Cash ISAs.
This limit will operate within the existing £20,000 annual ISA allowance, meaning savers will need to think more carefully about how they allocate their tax-free savings between cash and investment products.
The Budget also includes exemptions for older savers and a long-term freeze on allowances.
What Has Been Announced?
1. Cash ISA contributions capped at £12,000
From 2027/28, individuals will only be able to put up to £12,000 per year into Cash ISAs.
This cap applies within the current £20,000 ISA allowance, meaning:
- Maximum Cash ISA: £12,000
- Remaining Stocks & Shares or other ISA types: £8,000
Investors who favour cash will need to adjust their savings strategy accordingly.
2. Over-65s exempt from the cap
Individuals aged 65 or over will not be restricted by the £12,000 Cash ISA limit.
This means older savers can continue to use their full ISA allowance for cash if they prefer, offering:
- Flexibility for low-risk savers
- Greater protection for those relying on cash savings in retirement
- A smoother transition for older individuals with existing cash-heavy portfolios
3. Allowances frozen until 2031
The ISA allowance — currently £20,000 — will be frozen until at least 2031.
Combined with the new Cash ISA cap, this freeze will:
- Limit the tax-free savings opportunity during a period of inflation
- Push more savers towards investment ISAs
- Gradually reduce the real value of ISA allowances over time
This continues the wider theme of threshold freezes seen across the Budget.
Why Has This Change Been Introduced?
The government has signalled several aims:
- Encourage individuals to invest rather than hold large cash balances
- Support long-term capital markets and business investment
- Reduce the cost of providing generous tax relief on cash savings
- Target exemptions where savers are more vulnerable to risk (over-65s)
This represents a policy shift towards promoting investment-backed growth.
Who Is Most Affected?
1. Cash-focused savers
Those who currently put the full £20,000 into Cash ISAs will need to adjust to an £8,000 reduction.
2. Risk-averse investors under 65
Individuals who prefer cash over investments may be pushed towards alternative vehicles.
3. Higher-income and regular ISA contributors
Those who fully use their allowance each year will need to rethink how they maximise tax efficiency.
4. Younger and mid-life savers
People below 65 are not exempt and may need to increase investment exposure to maintain tax efficiency.
Potential Planning Considerations
Savers may wish to consider the following:
1. Review asset allocation
If you typically max out Cash ISAs, you may need to shift some savings into Stocks & Shares ISAs.
2. Plan ahead before 2027
The 2026/27 tax year may be the last chance to place the full £20,000 into cash.
3. Use the over-65 exemption strategically
Couples where one partner is 65+ could consider allocating more cash in that person’s ISA.
4. Reassess long-term savings strategy
Freezing allowances until 2031 effectively reduces real tax-free savings potential.
5. Consider pensions as a complementary tax shelter
Where investment exposure is acceptable, pension contributions remain highly tax efficient.
Summary
The introduction of a £12,000 Cash ISA cap from 2027, combined with a freeze on ISA allowances until 2031, marks a significant shift in the UK savings landscape. While older savers benefit from exemptions, many individuals will need to rethink how they structure their tax-free savings.
As the government moves towards encouraging investment-based wealth building, savers should start planning early to ensure their ISA strategy remains both compliant and tax efficient.
Merranti Accounting can help you assess the impact of these changes and optimise your savings and investment approach ahead of 2027.
