But the landscape is set to change. Reforms announced in the 2025 Autumn Budget signal a clear shift in direction – one that could influence how you think about saving and investing in the years ahead.
A lower Cash ISA limit for under-65s
From 6 April 2027, a new restriction will apply. If you’re under 65, you’ll only be able to contribute up to £12,000 a year into Cash ISAs².
The overall £20,000 ISA allowance isn’t going anywhere – but the reduced cash limit is designed to encourage more people to move beyond cash and consider longer-term investments. It’s part of a broader effort to support economic growth by promoting retail investing.
New rules aimed at cash held elsewhere
Alongside this change, HMRC has introduced further rules to prevent workarounds.
There was concern that some savers might simply hold cash within Stocks & Shares or Innovative Finance ISAs instead. To counter this, new anti-circumvention measures were announced in June².
These include:
- A 22% charge on interest earned from cash held inside non-Cash ISAs¹
- Restrictions on transferring cash from Stocks & Shares or Innovative Finance ISAs into Cash ISAs for under-65s
- Limits on holding entirely ‘cash-like’ investments within non-Cash ISAs
Taken together, these steps are intended to discourage large cash balances outside Cash ISAs – reinforcing the government’s focus on investment rather than savings alone.
Different approach for over-65s
Notably, these changes won’t apply in the same way to those aged 65 and over.
This suggests a recognition that older investors may have less time to recover from market fluctuations. Younger investors, in contrast, are seen as better placed to ride out short-term volatility in pursuit of longer-term growth.
Industry reaction – cautious at best
Reaction across the industry has been mixed, and in many cases sceptical³.
Critics argue that introducing age-based limits, adding tax elements to ISAs, and increasing overall complexity could make an already popular product harder to use.
Research from the lang cat consultancy highlights this concern, noting that the proposals risk “making a simple product more complex” and may even discourage ISA use altogether⁴.
What this could mean for you
These changes aren’t happening overnight – but they do signal a shift in how ISAs may be used in future.
For some, it could mean rethinking the balance between cash and investments. For others, it may simply be about understanding how new rules affect existing habits.
At Lync Wealth Management, we’ll help you make sense of these developments in the context of your own goals. If you’re unsure how these changes could affect you, or whether any action is needed, it’s worth having a conversation sooner rather than later.
You can get in touch in the usual way.
Important information
This article is for information purposes only and doesn’t constitute financial, investment or tax advice. Tax treatment depends on individual circumstances and may change in future.
The information in this article is based on legislation, HM Treasury and HMRC announcements, and public information available at the date of publication. Future legislation, regulations or guidance may change before the measures described take effect.
Investments can fall as well as rise in value and you may get back less than you originally invested. The value of any tax benefits will depend on your individual circumstances.
If you’re not sure whether any action is appropriate for your personal situation, please speak to your financial adviser before making any investment or tax-planning decisions.
Sources
1 HMRC Tax-free savings newsletter 19 — November 2025 – GOV.UK
2 HMRC ISA reform 2027: anti-circumvention rules factsheet – GOV.UK
3 Reeves’ new tax charge on cash ISAs faces fierce industry backlash and Cash Individual Savings Account: Government Response
4 The lang cat, response to HMRC ISA reform proposals, June 2026.
