A series of upcoming changes to ISA rules is expected to affect how some savers earn interest on their money, with reports highlighting a new 22% tax on interest linked to cash held within certain non-cash ISAs. The adjustment is part of wider policy efforts aimed at encouraging more people in the UK to invest rather than keep large sums in cash-based savings products.
However, financial experts have warned that the evolving structure of ISA rules could create confusion for savers, particularly at a time when households are already dealing with higher taxes and changing savings allowances.
Change
The key development relates to how interest is treated inside different types of ISAs, particularly stocks and shares ISAs that hold cash balances.
Under the updated approach, interest generated from certain cash holdings within non-cash ISAs may be subject to a 22% tax. The aim is to distinguish between money held in dedicated cash ISAs and cash that sits temporarily or passively inside investment accounts.
Importantly, this does not represent a blanket tax on all ISAs or savings products, but rather a targeted adjustment affecting specific types of balances.
Clarification
Experts stress that cash ISAs themselves remain unaffected in terms of tax treatment. Money held in a cash ISA will continue to earn interest free from income tax, within the standard ISA allowance.
Kevin Mountford, personal finance expert and co-founder of Raisin UK, noted that the key issue for savers is understanding where their money is actually held rather than assuming all ISA types work in the same way.
He explained that confusion often arises when cash is stored inside investment-focused ISAs rather than dedicated cash ISA accounts.
Risk
One of the main concerns highlighted by analysts is not necessarily the tax change itself, but the potential for misunderstanding.
Savers who are unclear about their ISA type or how their provider manages uninvested cash could unintentionally lose out on tax-free benefits or face unexpected tax exposure on interest earned.
There is also a broader concern that repeated rule changes could discourage long-term planning, particularly among individuals who rely on ISAs as a stable savings tool.
Accounts
Different ISA types operate in different ways, which is central to understanding the update:
- Cash ISAs are designed for savings deposits earning tax-free interest
- Stocks and shares ISAs are designed for investments but may temporarily hold cash
- Cash held within investment ISAs may be treated differently under new rules
The distinction matters because the tax treatment depends not only on the ISA wrapper itself, but also on how the funds are held within it.
Guidance
Financial experts are encouraging savers to review their ISA arrangements rather than react quickly to headline changes.
Key steps include:
- Checking which type of ISA you hold
- Identifying whether any cash is sitting inside an investment account
- Contacting providers to clarify how interest is applied
- Comparing savings rates across different products
The focus, according to advisers, should be on ensuring that savings are structured efficiently rather than making abrupt investment decisions based on rule changes alone.
Outlook
With further changes expected from April 2027, including adjustments to savings tax rates and allowances, more savers could find themselves exposed to tax on interest outside ISA protection.
While the core structure of ISAs remains in place, the evolving rules underline the importance of understanding how different accounts operate. For most households, the main takeaway is not urgency, but clarity around where money is held and how it is treated under tax rules.
FAQs
Are cash ISAs being taxed under the new rules?
No, cash ISAs remain tax-free within allowance limits.
What is affected by the 22% tax change?
Certain cash holdings inside stocks and shares ISAs.
Do I need to move my ISA money immediately?
No, but you should check how your ISA is structured.
Why are ISA rules changing?
To encourage more investment and clarify tax treatment.
