From April 6, 2027, savers will be charged a flat rate of 22% on any interest earned from cash held within a Stocks and Shares ISA. This marks a notable shift in the UK's ISA landscape, designed to encourage investment rather than using investment wrappers for long-term cash holdings.
What's Changing and When?
The most immediate and impactful change is the introduction of a 22% charge on interest derived from cash held within a Stocks and Shares ISA (often referred to as a non-cash ISA). This also extends to 'alternative finance returns' treated similarly to interest. This measure, confirmed by HMRC, is intended to prevent individuals from using the broader investment ISA allowance to shelter significant cash sums tax-free, circumventing the dedicated Cash ISA limits.
Alongside this, the annual Cash ISA allowance for individuals under the age of 65 will be reduced from £20,000 to £12,000, also effective from April 6, 2027. For those aged 65 and over, the Cash ISA allowance will remain at £20,000. The overall annual ISA limit across all types, including Stocks and Shares, Lifetime, and Innovative Finance ISAs, will stay at £20,000.
Further restrictions include new rules preventing 100% of a non-cash ISA from being held in Money Market Funds (cash-like assets) without incurring the charge. These funds will only remain charge-free when held alongside other investments such as shares, funds, ETFs, and bonds. Crucially, transfers of money from non-cash ISAs to Cash ISAs will not be permitted for those under 65 from the effective date, though transfers in the opposite direction will still be allowed.
A Return to Previous Regimes?
This isn't entirely new territory. The 22% charge echoes a previous ISA regime where a 20% tax applied to cash interest within investment ISAs, a rule HMRC scrapped in 2014. The government's stated aim is to 'encourage people to invest' and prevent the 'circumvention of the lower Cash ISA limit,' as outlined in HMRC's factsheet.
Scenario: The Impact on Your Cash Holdings
Consider a saver, aged 45, who currently holds £10,000 in cash within their Stocks and Shares ISA, earning 4% interest. Under the current rules, this £400 interest would be tax-free. From April 6, 2027, that same £400 interest would be subject to a 22% charge, meaning £88 would be deducted. This leaves a net interest of £312, effectively reducing the tax-free benefit of holding cash in this wrapper.
What this means for you
If you currently hold significant cash sums within a Stocks and Shares ISA, or plan to, you will need to re-evaluate your strategy. The 22% charge means that the tax-free status of interest on such holdings will largely disappear. It may be worth considering whether these funds would be better placed in a dedicated Cash ISA, up to your allowance, or in a standard savings account where interest is tax-free up to your Personal Savings Allowance (£1,000 for basic rate taxpayers, £500 for higher rate taxpayers).
What to do Right Now
- Review Your ISA Holdings: Check how much cash you currently hold within your Stocks and Shares ISA. Understand the interest rates you are earning.
- Consider Your Objectives: If these funds are intended for short-term savings, a Cash ISA or a standard savings account might be more appropriate, especially given the reduced Cash ISA allowance for those under 65.
- Explore Investment Options: If your aim is long-term growth, ensure the funds in your Stocks and Shares ISA are genuinely invested in assets like shares, funds, or bonds, which remain tax-efficient within the wrapper.
- Understand Allowances: Remember the overall £20,000 ISA limit. For first-time buyers, a Lifetime ISA offers a 25% government bonus on contributions up to £4,000 per year, a significant benefit not impacted by these changes.
When is this Effective?
The new rules, including the 22% charge and the reduced Cash ISA allowance for under 65s, will come into effect on April 6, 2027. HMRC is expected to conduct a technical consultation with the industry on the draft legislation shortly, with regulations to be laid in the autumn.
Where to Get Help
Navigating changes to tax wrappers can be complex. For personalised advice on your specific financial situation, many advisers recommend seeking independent financial guidance.
This is not financial advice. Seek independent financial guidance. Interest on standard accounts may be subject to tax above your Personal Savings Allowance.
Sources
- HM Revenue and Customs (HMRC) — Factsheet on ISA changes
- HM Revenue and Customs (HMRC) — Government summary of tax updates
- Money Saving Expert — Article on Savers to be charged for holding cash in stocks and shares ISAs