Cash ISA or Stocks and Shares ISA After the 2026 Budget?

If you were planning around a smaller cash ISA allowance from April 2027, you can stop. In the Autumn Budget on 28 October 2026, the Chancellor scrapped the planned cut, so savers of every age can keep paying up to £20,000 a year into cash, and the extra rules that came with it have gone too. That takes the deadline out of the stocks and shares ISA vs cash ISA question, but not the question itself. Here is what changed, what it means for you, and how to think about splitting your money as part of managing your wealth over time.

Your ISA allowance, in numbers

The cut to £12,000 for under 65s was announced in the Autumn Budget 2025. It has now been reversed, so the rules you know today carry on from April 2027.

The change that does arrive in April 2027 is outside ISAs. After increases announced in the last two Budgets, tax on savings interest rises to 24% for basic rate taxpayers, 44% for higher rate and 49% for additional rate taxpayers. The Personal Savings Allowance stays at £1,000 for basic rate and £500 for higher rate taxpayers, but interest above that will cost more. Money inside an ISA is not affected, which makes the full allowance more valuable than before.

Stocks and shares ISA vs cash ISA

The simplest way to think about it is certainty against growth. Both accounts are tax free, so you pay nothing on interest or investment gains. What differs is how your money behaves inside them.

A cash ISA can’t fall in value. You know exactly what you have, and you can usually get to it quickly. The catch is inflation. With prices expected to rise by around 3.75% by the end of this year, a cash ISA paying less than that is losing spending power every month, even though the balance keeps going up.

A stocks and shares ISA invests in funds, shares or bonds. Over long periods that has historically given money a better chance of beating inflation, but nothing is guaranteed and values can drop sharply in the short term. That is why the time you can leave the money alone matters more than almost anything else. Our guide on why most investors underperform shows how often it is people’s reactions to those drops, not the markets, that cost them most.

Three savers, three different answers

There is no right split that works for everyone. These examples are illustrations, not recommendations, but they show how the same rules play out very differently.

Priya, 34, buying a home in the next two years. Her deposit belongs in cash. A market fall just before completion could leave her short at exactly the wrong moment, and she can keep paying up to £20,000 a year into a cash ISA while she saves.

Mark, 52, with £80,000 built up in cash ISAs. He doesn’t expect to touch most of it until he retires in ten years or more. Keeping six months of spending in cash and investing the rest gradually could give that money a better chance of keeping pace with inflation. With the cash limit staying at £20,000, nothing forces that decision on him. It comes down to when he will need the money.

Jean, 68, already retired. She can keep using the full £20,000 for cash, as before. Her question is different: how much to hold in cash to cover the next couple of years of income, and how much to leave invested for later. Our guide to creating a sustainable retirement income looks at that balance.

ISA transfers stay flexible

You can still move money freely between cash and stocks and shares ISAs, in either direction and at any age. The planned ban on moving money from investments back into cash for under 65s has been dropped.

Two other planned rules have gone too. Interest on cash held inside a stocks and shares ISA stays tax free, with no 22% charge, and the rules meant to stop investment ISAs being used as cash accounts have been dropped.

Even so, a large uninvested balance in a stocks and shares ISA is worth a look. Money left sitting for years is not doing the job it was put there for, so decide whether to invest it or move it into a cash ISA. ISA transfers don’t use up your annual allowance, so moving existing money is not the same as paying in new money.

A new Starter ISA for first time investors

The Chancellor also said the Government will work with the industry on a new Starter ISA, with an incentive for people investing in a stocks and shares ISA for the first time. No details or dates have been confirmed yet.

Getting the split right

Start with an emergency fund of three to six months’ spending in easy access cash, so you are never forced to sell investments at a bad time. After that, match each pot of money to when you will need it: shorter term goals in cash, money you can leave for five years or more with the chance to grow. And be honest about how you would feel if your investments fell by a fifth in a bad year.

Your ISAs are only one part of the picture, alongside your pension, other savings and your wider financial plan. If you would like help deciding how much to keep in cash and how much to invest, book a review with us and we will look at it with the rest of your finances.

Who it’s for

Anyone who uses a cash ISA every year and wants to know where they stand after the 2026 Budget, anyone holding uninvested cash inside a stocks and shares ISA, and anyone weighing up whether it is time to start investing some of their savings for the longer term.