What do the 2027 ISA Reforms Mean for Me?

What do the 2027 ISA Reforms Mean for Me?

• What are the 2027 ISA reforms?
• Why is the Government encouraging investing?
• How could investors be affected?

Thomas Hyde, Junior Investment Research Analyst

5 min read

The UK is a nation of savers. The Office for National Statistics (ONS) estimates that the total value of excess savings accumulated by UK households since the start of the COVID-19 pandemic ranges between £143-£338bn, or 7.9-18.7% of total annual household resources. Excess savings, according to the ONS, refers to “the accumulation of household saving during the pandemic.”

The new rules are designed to encourage more people to invest rather than hold cash, and to minimise the opportunity for the lower Cash ISA limit to be circumvented, while preserving the flexibility needed for legitimate investment activity within non-Cash ISAs. To achieve this, the Government has announced a series of ISA reforms set to be introduced at the start of the next tax year in April 2027.

What is changing?


How could investors be affected?
The reforms aim to encourage greater participation in investing, but where might people consider investing?

While equities have historically been the driver of long-term returns, some investors may still want part of their portfolio to be stable and easily accessed. Under the new rules, investors would be allowed to hold cash-like assets within a Stocks and Shares ISA without becoming subject to the new charge, provided they do not make up 100% of the portfolio.

At present, money market funds would be the only investments formally classified as cash-like under the new rules. Below, we explain how they work and consider other investments that behave similarly to cash. Like other investments, however, money market funds can fall as well as rise in value.

Money Market Funds:
Money market funds invest in assets known as money-market instruments, a type of short-term debt issued by the likes of governments, financial institutions, and high-quality companies. The fund earns interest at a rate close to the current base rate, plus a small return for taking on the risk of lending to these borrowers.

These instruments typically mature within a year and are issued by borrowers that are considered highly likely to repay their debts. As a result, money market funds are generally regarded as a low-risk investment, although they are not entirely risk-free.

One downside of money market funds is the lack of Financial Services Compensation Scheme protection offered. The scheme can provide support where the investment provider fails and cannot return client assets, but it does not protect against a fall in the value of the fund itself.

Ultra-Short Bond Funds:
Ultra-short bond funds work in a similar way to money market funds, by lending to governments, banks and companies over short periods. However, they are not subject to the same strict limits on credit quality and loan length.

As borrowers are less certain to repay, the value of the fund’s loans can fall in times of market stress, so these funds usually pay a higher rate of interest than a money market fund to compensate investors for taking on additional risk.

Most of the price movement comes from borrower risk, rather than changes in interest rates. As a result, ultra-short bond funds are better suited to money that can be left invested for a year or more.

Treasury Bills:
Treasury Bills (T-bills) are a type of debt issued by the UK Government to fund day-to-day expenditure. Unlike regular gilts, T-bills are short-term zero-coupon bonds, meaning they pay no coupon over their life. Instead, investors buy the bill, at a discount to its face value.

Maturity proceeds remain fixed irrespective of the prevailing rate offered by the Bank of England (BoE). These maturity proceeds are fixed regardless of whether the BoE changes rates, more like a fixed-rate deposit than a money market fund, where the return moves with the market. By locking in a rate with T-bills, investors can benefit from falling interest rates, but also be disadvantaged by a rise, as the face value remains fixed.

Conclusion:
Overall, the upcoming ISA reforms will require some investors to find a home for money that would have previously been held in a Cash ISA. Money market funds, T-bills and ultra-short bond funds each offer a way of holding that money within a Stocks and Shares ISA.

The most appropriate solution depends on factors such as when the money is likely to be needed, appetite for risk, and how much fluctuation in its value can be tolerated along the way. If you would like to discuss your investments or your investment options, please contact your usual Redmayne Bentley executive or office.

Please note, although the government announced these core measures in mid-2026, the final rules will be laid out in the autumn.

Please note that this communication is for information only and does not constitute a recommendation to buy or sell the shares of the investments mentioned. Investments and income arising from them can fall as well as rise in value. Past performance and forecasts are not reliable indicators of future results and performance. The information and views were correct at time of publishing but may have changed at point of reading. Please note that tax treatment depends on the specific circumstances of each individual and may be subject to change in the future.