The planned cap on cash ISA contributions was set to begin next year, but it has now been dropped. If you have already used your full ISA allowance for cash, what are your options?
"I added more money to my ISA before the rules were due to change - should I invest it?"
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Savers can still pay up to 20,000 a year into cash ISAs after Chancellor John Healey scrapped plans to cut the annual cash ISA allowance.
The government had intended to restrict under-65s to 12,000 per tax year from April 2027, hoping to push more people towards investments.
You can still pay as much as 20,000 a year into cash ISAs, or divide your annual ISA allowance between different ISA types.
According to the Bank of England, cash ISA deposits reached a record 57 billion in 2025.
Now that the ISA rules will stay the same, what can you do if you've put your full allowance into cash?
Why you might be holding too much cash
Cash belongs in any solid safety net. An emergency fund should generally cover three to six months of essential expenses, kept in a savings account you can access quickly when an unexpected bill arrives.
Unlike investments, cash holdings do not lose value when markets rise and fall.
Money set aside for a near-term expense - such as a car or wedding - usually belongs in a cash savings account.
But keeping an excessive amount of cash may weaken your wealth over time. Andy Reed, who leads behavioural economics research at the investment platform Vanguard, made that point recently on the BFIA Talks podcast, saying cash can become "too much of a good thing."
"Once you're holding more cash than you need for immediate emergencies, you're paying an opportunity cost. The return you miss by leaving that money uninvested may be far greater than you realize," he said.
Even so, most people in Britain keep their savings in cash. Almost 17 million adult ISA accounts were opened during the 2024/25 tax year: 10.7 million were cash ISAs, compared with just 4.9 million stocks and shares ISAs.
Should you move money from a cash ISA to a stocks and shares ISA?
The right amount to keep in cash depends on your circumstances. If you believe your money might earn more in the stock market than in a savings account, investing could be worth considering.
At the end of October 2026, the best five-year fixed-rate cash ISA paid 5.25% interest. Putting 20,000 into it would produce 5,989 in tax-free interest over the full term.
A balanced portfolio may produce better returns. Over the past five years, the S&P 500 - which follows 500 of the largest US companies - has averaged annualised gains of about 13%.
Investing the same 20,000 at an average annual return of 13% for five years would have increased it to 38,177 - an 18,177 gain before fees. Held in a stocks and shares ISA, that money would not be subject to capital gains tax or dividend tax paid to HMRC.
Past performance cannot promise what comes next. Still, the gap shows how much more the stock market may earn over a longer stretch of time. Most advice recommends staying invested for at least five to ten years.
Although the gap between savings interest and possible investment returns exceeds 12,000, investing still may not suit everyone - especially when you'll need that money soon.
Helen Morrissey, head of retirement analysis at Hargreaves Lansdown, said the right choice depends on what the money is for. If you expect to need it within the next three years, keeping it in cash may be wiser.
Investment markets can fall sharply. If you might need the money within the next three years, you could be forced to withdraw it at a loss. Giving your investments more time to grow can make short-term swings easier to withstand, so investing may be worth considering when you can leave the money untouched for at least three years. Before you commit, make sure you understand the risks and feel comfortable with the investment.
Can you transfer a cash ISA into a stocks and shares ISA?
Yes. Moving money from a cash ISA to a stocks and shares ISA will not affect your allowance. If you paid into a cash ISA before the now-scrapped ISA changes but would rather invest that money, you can transfer it.
When moving money between ISAs, arrange the transfer through the providers rather than taking the money out yourself. A withdrawal removes the funds from the tax-free ISA system, and any part of your annual ISA allowance already used will normally be lost - unless the account is flexible.
Put 20,000 into a cash ISA during 2026/27 and withdraw it later, and you cannot pay that amount into a stocks and shares ISA during the same tax year because your ISA allowance has already been used.
To move the money between ISAs, contact the provider you want to use and ask for an ISA transfer. It will send you a transfer form to complete.
Transferring an ISA takes more time than a regular bank transfer, but your money keeps its tax-free status.
Morrisey said: "If you've already put your full annual ISA allowance into a cash ISA, you might still be able to move part of it to a stocks and shares ISA. Check first with both providers - the one you're transferring from and the one receiving the money - to see whether either imposes restrictions."
Follow the transfer process. Don't withdraw money from the cash ISA and pay it into a stocks and shares ISA yourself; doing so would count against your annual allowance.
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