For years, the Individual Savings Account (ISA) has stood as a cornerstone of tax-efficient saving in the UK. However, a significant shift is on the horizon, with the introduction of a 22% tax on interest earned from uninvested cash held within Stocks and Shares ISAs, effective from April 2027. This marks a departure from the long-standing principle of tax-free growth within the ISA wrapper, compelling savers to re-evaluate their strategies.
The Looming 22% Tax on Cash in Stocks & Shares ISAs
The most impactful change for many investors is the flat-rate 22% tax on interest from cash held within a Stocks and Shares ISA. This is not merely a tweak; it is a fundamental alteration to the tax treatment of these accounts. Unlike interest earned in standard savings accounts, which is subject to your marginal income tax rate and can be offset by your Personal Savings Allowance (PSA), this new 22% charge applies irrespective of your income tax band (basic, higher, or additional rate) and cannot be mitigated by the PSA.
Scenario: What this means for your uninvested cash
Consider an individual with £10,000 in uninvested cash within their Stocks and Shares ISA, earning an illustrative 4% interest per annum. Currently, this £400 in interest would be entirely tax-free. From April 2027, however, that £400 would be subject to the 22% tax, resulting in a charge of £88. This effectively reduces the net interest rate to 3.12%, a noticeable erosion of returns that many ISA holders may not anticipate.
Other Significant Changes from April 2027
Beyond the 22% tax, April 2027 brings further adjustments:
- Reduced Cash ISA Limit: For individuals under the age of 65, the annual Cash ISA allowance will be reduced from the current £20,000 to £12,000. Those aged 65 and over will retain the full £20,000 cash allowance. This creates a two-tiered system based on age, a complexity not previously seen.
- Transfer Restrictions: Transfers from non-Cash ISAs (such as Stocks & Shares ISAs) into Cash ISAs will no longer be permitted for those under 65. Transfers from Cash ISAs to non-Cash ISAs will still be allowed, and transfers of Stocks & Shares ISAs to Cash ISAs will remain an option for those aged 65 and over.
Changes Already in Effect (from April 2024)
While the more punitive changes are still some time away, the 2024/25 tax year, which began on April 6, 2024, introduced several flexibilities:
- Multiple Subscriptions: You can now pay into multiple ISAs of the same type within the same tax year. For example, you could contribute to a Cash ISA with one provider and another Cash ISA with a different provider in the same year. This flexibility does not extend to Lifetime ISAs or Junior ISAs.
- No Reapplication for Dormant ISAs: The administrative burden of reapplying for an existing ISA account that received no subscription in the previous tax year has been removed.
- Partial Transfers: Partial transfers of current year ISA subscriptions between providers are now permitted, offering greater control over your savings.
- Harmonised Age: The minimum age for opening any adult ISA has been harmonised to 18.
The overall adult ISA annual subscription limit remains frozen at £20,000, a figure that has not changed since 2017 and is set to remain static until at least 2030/31. The Lifetime ISA (LISA) allowance remains £4,000 per tax year (counting towards the overall £20,000 limit), offering a 25% government bonus for first-time buyers up to £1,000 per year. Junior ISAs retain a £9,000 annual allowance.
What Critics Say
These new measures have not been universally welcomed. As reported by Daily Business, some commentators suggest these changes effectively 'hammer Isa savers with new tax charge'. The imposition of a tax on cash within a wrapper designed for tax-free growth is seen by some as undermining the very purpose of ISAs, particularly for those who maintain a cash buffer within their investment accounts for liquidity or market timing.
What this means for you
You should review your current ISA holdings, particularly any significant cash balances within Stocks and Shares ISAs, and consider whether these funds could be better deployed in a Cash ISA, or indeed invested, before the April 2027 deadline. For those under 65, the reduced Cash ISA allowance from 2027 also necessitates a forward-looking strategy for tax-efficient cash savings.
What to do right now
- Review your Stocks & Shares ISA: Identify any uninvested cash balances. Consider whether these funds are genuinely awaiting investment or could be moved to a Cash ISA or invested to avoid the 22% tax from April 2027.
- Consider your Cash ISA strategy: If you are under 65 and rely heavily on Cash ISAs, be aware of the reduced £12,000 allowance from April 2027. Plan your contributions accordingly for future tax years.
- Utilise current allowances: Ensure you are making the most of your £20,000 overall ISA allowance, and the £4,000 LISA allowance if you are a first-time buyer. For larger sums, always consider ISA alternatives to standard savings accounts, where interest above your Personal Savings Allowance (£1,000 for basic rate, £500 for higher rate taxpayers) is taxable.
Where to get help
For personalised advice on how these changes might affect your specific financial situation, seeking guidance from an independent financial adviser is recommended.
Sources
- AI-Researched Primary Sources — Key facts on ISA allowances and changes
- The Guardian — Reporting on the 22% tax on cash interest in Stocks & Shares ISAs
- Money Saving Expert — Reporting on the 22% charge on interest from cash in Stocks & Shares ISAs
- Morningstar — Explanation of ISA tax changes
- Daily Business — Commentary on the impact of new tax charges
This is not financial advice. Seek independent financial guidance. Interest on standard accounts may be subject to tax above your Personal Savings Allowance.