What’s Changing with ISAs?
ISAs have long been one of the simplest and most valuable tools in financial planning, but they are back in the headlines following government updates on a proposed new First Time Buyer ISA and changes to how some ISA cash interest will be treated from April 2027. At a high level, the message for savers is this: the ISA wrapper remains very valuable, but how you use it may matter even more going forward.
A Simpler Option for First-time Buyers
The proposed replacement for the Lifetime ISA is the new First Time Buyer ISA. The government published its consultation on 23rd June 2026 and the aim is to create a simpler product focused purely on helping people buy their first home. Unlike the current Lifetime ISA, which combines both house purchase and retirement saving, the new version is expected to be more targeted and easier to understand.
Under current proposals, the account would be available to first-time buyers aged 18 and over, with no upper age limit. It would sit within the existing ISA system and be available in both cash and stocks & shares formats. One key difference is that any government bonus would be paid when the property is purchased, rather than being added along the way. Importantly, there would also be no penalty if plans change and the funds are withdrawn. The exact launch date has not yet been confirmed, although the new product is expected to be introduced once the consultation and legislative process has been completed.
The existing Lifetime ISA (LISA) will not disappear immediately. It remains available for now, allowing contributions of up to £4,000 per year with a 25% government bonus. Existing LISA holders are also expected to be able to continue using their accounts under the current rules. However, the LISA has been criticised for its complexity, particularly around withdrawal rules, which is one of the drivers behind the proposed change.
What the ISA “Tax Charge” Really Means
Alongside this, there has been some confusion around what has been referred to as an “ISA interest tax charge”. To be clear, ISAs themselves remain tax-efficient. Cash ISAs still allow you to earn interest tax-free, and stocks and shares ISAs continue to protect investment growth and income from tax.
The change applies more narrowly. From April 2027, a 22% charge will apply to interest earned on uninvested cash held within a stocks and shares ISA (or other non-cash ISAs). In practice, this means that if cash is sitting idle within an investment ISA, rather than being invested, it may no longer benefit from full tax-free treatment.
There are also wider changes on the horizon. From 6 April 2027, savers under age 65 will only be able to pay up to £12,000 per tax year into Cash ISAs. The overall ISA allowance will remain £20,000, so the remaining allowance could still be used for other ISA types, such as a stocks and shares ISA. Those aged 65 and over are expected to retain the ability to use the full £20,000 annual ISA allowance in Cash ISAs.
Cash or Investments: Where Should Your ISA Money Sit?
The starting point is simple: cash and investments do different jobs, but the ISA allowance is limited. That means it is worth thinking carefully about what you choose to shelter inside it.
Cash is useful for money you may need soon. A Cash ISA can be sensible for emergency savings, planned spending or a short-term goal, because it gives you access and avoids investment ups and downs.
For longer-term money however, it is usually worth asking whether your ISA is being used in the most tax-efficient way. The investments or savings that produce the highest interest, income or growth are often the ones that benefit most from being inside an ISA, because that return is then protected from tax.
Put another way, it may not be efficient to use your ISA allowance for low-return cash while holding higher-return assets outside an ISA, where the interest, dividends or gains could be taxable. Even if cash is needed for short-term spending or emergency funds, it may sometimes be better to hold that cash in a standard savings account and use the ISA allowance for investments that have greater tax-saving potential.
That does not mean cash should never be held in an ISA, but it does mean the decision should be deliberate and considered alongside your wider savings and investments. The proposed charge on uninvested cash inside stocks and shares ISAs makes this point even more relevant. If cash is sitting in an investment ISA with no clear purpose, or if investments are being held outside an ISA while cash uses up the allowance, it may be worth reviewing whether the overall structure could be improved.
What Should You Do Next?
The important point is that ISA planning should not be left on autopilot. These changes do not make ISAs less valuable, but they do increase the need to be more deliberate about how the allowance is used. Cash ISAs may still be appropriate for short-term savings, emergency funds and planned spending, but longer-term money should be reviewed to ensure it is not being held in cash unnecessarily.
In practice, this means looking at your ISA savings alongside your wider investments, not in isolation. If higher-return assets are held outside an ISA while low-return cash sits inside one, the available tax shelter may not be being used effectively. A sensible review should consider your need for access, your time horizon, your attitude to investment risk and your wider tax position.
For clients who receive regular reviews from us, if these changes are likely to affect you, we will discuss them with you at your next review meeting so there is nothing you need to do right now. If however, you have any questions, please get in touch. If you know someone who is saving for a first home, holding larger cash balances, or unsure how best to use their ISA allowance, please feel free to share this article with them.
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