The landscape for tax-efficient savings in the UK has seen a notable adjustment, with the annual Cash ISA allowance for individuals under 65 reduced to £12,000. This change, announced in the Autumn Budget 2025, is now in effect for the current financial year, marking a shift in how many savers can utilise their tax-free wrapper.
For years, the ISA allowance has been a cornerstone of personal finance planning, offering a straightforward way to shield savings interest from Her Majesty's Revenue and Customs. The decision to differentiate the Cash ISA limit based on age introduces a new layer of complexity for those navigating their savings options.
What Changed and By How Much?
Previously, the overall ISA allowance stood at £20,000 for all eligible adults. While the total ISA allowance remains at £20,000, the specific allocation for Cash ISAs has been curtailed for a significant portion of the population. Those under 65 now face a £12,000 cap on new contributions to Cash ISAs within their overall £20,000 limit. This means that if you are under 65 and wish to maximise your tax-free savings, you would need to allocate the remaining £8,000 of your allowance to other ISA types, such as Stocks & Shares ISAs or Innovative Finance ISAs.
The move, as reported by Money Saving Expert, was a specific policy adjustment from the Autumn Budget 2025. It's a targeted change, leaving the allowance for those aged 65 and over untouched, presumably to support older savers who may rely more heavily on interest income.
Current ISA Rate Landscape (June 2026)
Despite the allowance adjustment, the competitive environment for ISA rates continues to offer opportunities. Moneyfacts reports that some of the highest ISA rates are currently available, making it prudent to review your existing arrangements.
For context, while standard savings accounts also offer competitive rates, as highlighted in Moneyfacts' weekly savings roundup, it's crucial to remember the tax implications. Interest earned on standard accounts is subject to tax above your Personal Savings Allowance (PSA).
- Personal Savings Allowance (PSA): Basic rate taxpayers can earn up to £1,000 in interest tax-free each year. Higher rate taxpayers see this allowance drop to £500. Additional rate taxpayers have no PSA.
- Cash ISAs: All interest earned within a Cash ISA is tax-free, regardless of your tax band or the amount of interest. This makes them particularly valuable for those whose interest earnings exceed their PSA.
Scenario: If you have £15,000 to save
Consider a 45-year-old individual with £15,000 they wish to save tax-efficiently. Under the new rules, they can only place £12,000 into a Cash ISA. The remaining £3,000 could be directed into a Stocks & Shares ISA, or if they are a first-time buyer, a Lifetime ISA (LISA).
A Lifetime ISA allows individuals aged 18-39 to save up to £4,000 per tax year towards their first home or retirement, receiving a 25% government bonus on contributions. This could mean an extra £1,000 annually if the maximum £4,000 is contributed. However, withdrawals for purposes other than a first home purchase (up to £450,000) or after age 60 incur a 25% penalty, effectively reclaiming the government bonus and some of your own capital.
But there are risks
While the reduction in the Cash ISA limit for under 65s might seem restrictive, it implicitly encourages diversification. However, for those with a low-risk appetite, or those who simply prefer the simplicity and capital protection of cash, this change means a smaller portion of their liquid savings can be shielded from tax. This could push some savers into taxable accounts sooner, potentially eroding returns for basic and higher rate taxpayers once their Personal Savings Allowance is exhausted.
What this means for you
If you are under 65, your immediate priority should be to understand that your tax-free Cash ISA contribution limit is now £12,000. This necessitates a review of your savings strategy to ensure you are still making the most of your overall £20,000 ISA allowance, potentially by exploring Stocks & Shares ISAs or, if eligible, a Lifetime ISA. For those whose interest earnings are likely to exceed their Personal Savings Allowance, maximising tax-free wrappers remains paramount.
Step-by-step what to do right now:
- Review your current savings: Check how much you have in Cash ISAs and standard savings accounts.
- Understand your allowance: If you are under 65, remember your Cash ISA limit is £12,000. Your overall ISA allowance remains £20,000.
- Compare rates: Use resources like Moneyfacts to find the highest available ISA rates.
- Consider other ISA types: If you have more than £12,000 to save tax-free, explore Stocks & Shares ISAs or, for first-time buyers, a Lifetime ISA.
- Check your Personal Savings Allowance: Be aware of how much interest you can earn tax-free outside an ISA based on your tax band.
When effective
The change to the Cash ISA limit for those under 65 became effective following the Autumn Budget 2025 and applies to the current 2026/2027 tax year.
Where to get help
For personalised advice on how these changes affect your specific financial situation, consider speaking with an independent financial adviser. Reputable comparison sites can also help you find the best rates for various ISA products.
Sources
- Moneyfacts — Weekly ISA Roundup | Highest ISA Rates
- Moneyfacts — Weekly Savings Roundup | Top UK accounts | June 2026
- Money Saving Expert — Autumn Budget 2025: Cash ISA limit cut to £12,000 a year – but only for those under 65
- trustintelligence.co.uk — Ideas for your ISA in 2026: continuing sessions - Mar 2026
This is not financial advice. Seek independent financial guidance. Interest on standard accounts may be subject to tax above your Personal Savings Allowance.