Investing has outperformed cash savings for a third consecutive year according to data from Moneyfacts, despite elevated cash ISA interest rates.
The data underpins important considerations about the risk of holding too much cash ahead of the cut to the cash ISA allowance for under-65s – due to be implemented from April 2027.
Moneyfacts found the average investment ISA fund saw growth of 11.22% between February 2025 and February 2026. By contract the average cash ISA interest rate was just 3.48% in the same period.
This average is down year-on-year, reflecting base rates cuts from the Bank of England (BoE) in the past 18 months. Since September 2024 the BoE has cut its base rate six times from a high of 5.25% to now 3.75%.
Rachel Springall, Finance Expert at Moneyfactscompare.co.uk, comments: “Investing ISAs have now outperformed cash ISA returns for a consecutive year. Over the past 12 months alone, investing in stocks & shares has returned three times more to savers than a cash ISA, based on average returns.
“This should be a wake-up call for those who fear investing, as cash returns have diminished. However, it is important to not rely on returns over the shorter-term when making longer-term investment decisions.
“It is going to take a lot more than positive returns to encourage an investing culture in the UK. Not every saver will feel confident enough to invest, but if they get good guidance, they can start small and slowly gain more knowledge to encourage them to increase their deposits.
“Cash is considered a safe choice, but investing shows the gains that could be made over the longer-term. Granted, past performance is not guaranteed to be repeated, so short-term gains should not be a decision maker in isolation. The past year alone laid bare the importance of seeking advice before taking the plunge to invest, some sectors boom one year and perform badly the next but can bounce back.”
Role for cash?
Cash has a role in a wider portfolio, but its limited benefit when considered against inflation shows it is not the best option for long-term savings growth.
Cash is still useful for short-term considerations, such as for a rainy-day fund. It is also useful for retired people who might want to ensure they aren’t forced to sell assets at times of market volatility to access needed cash.
The BoE is on course to continue cutting its base rate in 2026. This will have a further negative impact on average cash savings rates.
Finally, the Government is due to cut the cash ISA allowance for under-65s to £12,000 from April 2027. This measure was done deliberately to encourage more people to invest their money.
The full ISA allowance remains at £20,000 which means long-term savers can still benefit from the tax advantages of an ISA as long as their money is invested instead. More detailed proposals on what the Government will allow inside investment ISAs are due to be released but there is no firm date for this yet. Reports suggest this could include limiting ‘cash like’ investments inside investment ISAs and tax charges on cash held and not invested.
It is important to ensure you get this mix right for your long-term portfolio planning. A financial planner can help to assess your cash needs and the best way to balance the need for access to funds and ongoing long-term savings pot growth.