During her 2025 Budget, chancellor Rachel Reeves outlined several tax measures that could affect your finances. Among them was a change to Cash ISAs and how much you can contribute to these tax-efficient accounts each year.

The new rules come into effect from April 2027, and it’s important to understand how to respond to them.

The Cash ISA limit will fall to £12,000 a year from April 2027

ISAs are an incredibly tax-efficient savings and investing tool because you won’t pay Income Tax on interest you generate on cash savings. There is no Dividend Tax or Capital Gains Tax (CGT) to pay on investments in a Stocks and Shares ISA either.

Under the current rules, you have a £20,000 ISA allowance each tax year and you can divide this amount however you like. For example, you might put the entire £20,000 into a Cash ISA, invest the full amount, or split your allowance between cash and investments.

However, from April 2027, you will lose some of this flexibility if you are under 65.

While you will still have an overall ISA allowance of £20,000, you will only be able to put up to £12,000 into a Cash ISA each year, with the remaining £8,000 ringfenced for investing.

The rules will remain the same if you’re over 65.

The government is introducing these changes to encourage consumers to invest more instead of holding large amounts of cash.

Investing more of your wealth could support your long-term goals

The impending changes to the Cash ISA limit could be a useful opportunity to review how much cash you hold and whether this suits your goals.

Cash has an important role to play in your financial plan. An emergency buffer means you can absorb unexpected costs without using high-interest debt or dipping into savings you have ringfenced for other purposes.

You’ll likely save in a cash account for short-term goals such as holidays, too.

However, when you’re building wealth over a longer period, perhaps for retirement, cash has disadvantages.

Cash accounts may struggle to achieve inflation-beating growth. This means that the cost of goods and services grows faster than your wealth, so your spending power falls. In comparison, if you invest in a Stocks and Shares ISA, your returns might be more likely to outpace inflation.

Figures from the UK government support this, as they show that, in July 2025, 29 million people had cash sitting in accounts with an interest rate of about 1%. Meanwhile, average returns from Stocks and Shares ISAs were approximately 9%.

Consequently, over a long period, your returns from investing could be much greater than those from cash.

According to MoneyAge, if you had maxed out your ISA allowance each year since 1999 and held the entire amount in cash, you’d potentially miss out on more than £134,000 compared to those who invested in UK shares.

You may want to top up Cash ISAs before the changes in April 2027

As discussed, there are important uses for cash, even if investing can provide greater long-term growth. That’s why it’s important to look ahead and consider whether you need to top up your Cash ISA before the allowance falls in April 2027.

If you expect to have any large expenses soon, or you are saving for a specific goal such as a holiday, it could be worth increasing contributions to your Cash ISA now.

You may also want to review the size of your emergency fund. As the cost of goods and services rises, your cash savings won’t go as far as they once did. Topping up your emergency savings so they keep pace with inflation can help ensure you remain financially secure.

That said, keep in mind that holding too much cash could harm your ability to work towards long-term financial goals.

We can help you find the right balance between cash and investing when contributing to your ISAs

The planned changes to the Cash ISA limit may feel limiting, but you could see them as a chance to review how you hold your wealth.

We can support you here by using cashflow planning to determine how much you need to contribute to savings or investments each month to achieve your various goals.

With our help, you can balance your wealth between cash and investments to achieve short-term financial security while also working towards your wider aims.

Get in touch

You can email info@blueskyifas.co.uk or call us on 01189 876655 to discuss your savings and investing strategy today.

Please note

This article is for general information only and does not constitute advice. The information is aimed at individuals only.

All information is correct at the time of writing and is subject to change in the future.

Please do not act based on anything you might read in this article. All contents are based on our understanding of HMRC legislation, which is subject to change.

The Financial Conduct Authority does not regulate cashflow planning or tax planning.

The value of your investments (and any income from them) can go down as well as up and you may not get back the full amount you invested. Past performance is not a reliable indicator of future performance.

Investments should be considered over the longer term and should fit in with your overall attitude to risk and financial circumstances.