Your cash ISA allowance is shrinking: what the 2027 ISA changes mean for savers
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For a lot of people the cash ISA is the financial equivalent of a good umbrella. It is not exciting, you do not think about it much, and it has done the job every year without complaint, and is there for a rainy-day. Money goes in, the interest is tax-free, and that is the end of the matter. From April 2027 that quiet arrangement changes for most savers, and it is worth understanding now rather than discovering it in a letter from your provider.
The headline is straightforward. From 6 April 2027 the amount you can pay into a cash ISA each tax year falls to £12,000 if you are under 65. Your overall ISA allowance stays at £20,000, so nothing is being taken away from the total. What changes is where that money is allowed to sit. If you want to use the full £20,000, at least £8,000 of it will need to go into a stocks and shares ISA or another non-cash ISA rather than into savings.
Who is affected, and who is not
Savers aged 65 and over keep the full £20,000 cash ISA allowance, and helpfully the entitlement applies from the start of the tax year in which you turn 65 rather than from your birthday. HMRC has also set out rules designed to stop the new limit being sidestepped, because the obvious response to a smaller cash allowance is to park cash inside a stocks and shares ISA instead. From the same date, interest paid on cash held within a non-cash ISA will carry a flat charge of 22 per cent, paid to HMRC by the ISA manager rather than declared by you. A non-cash ISA also cannot be made up entirely of cash-like assets, which for this purpose means money market funds. Ordinary shares, funds, investment trusts, exchange traded funds, corporate bonds and gilts are not caught by that.
One more detail catches people out. Transfers from a non-cash ISA into a cash ISA will no longer be permitted for under-65s, although moving money the other way stays possible. The door swings one way.
• Cash ISA limit from 6 April 2027: £12,000 a year if you are under 65, £20,000 if you are 65 or over
• Overall ISA allowance: unchanged at £20,000
• A 22 per cent charge on interest paid on cash held inside a non-cash ISA
• No transfers from a non-cash ISA into a cash ISA for under-65s
Take Nadia, aged fifty-two, a fictional client whose habits are extremely common. She pays her spare money into a cash ISA every year, has built up a comfortable balance over time, and has never held an investment in her life. She was not upset when we explained the change so much as puzzled, because her first question was the right one: does this mean I have to start investing? While she can carry on using £12,000 of cash and simply leave the rest of her allowance unused, or hold savings outside an ISA and pay tax on the interest above her personal savings allowance. What the change does is force a decision she had never needed to make before, around whether cash is the right asset to be holding for the long-term.
The trade-off nobody can wish away
The government's stated aim is to encourage more people into investing, on the basis that savers may get more from their money over the long term. That may well prove true for some, but it is not a promise, and the trade-off is real. Capital held in a stocks and shares ISA can fall in value as well as rise, and you may get back less than you put in. Past performance tells you nothing reliable about the future. Cash does not behave that way, which is exactly why it suits money you may need soon, an emergency fund, or a house deposit you are counting on next year.
Cash is not free of risk either, though, just a different one. Over a long stretch, interest that trails inflation leaves you with less buying power than you started with, even though the balance on the statement has gone up. That is the honest version of the choice. Neither option is safe in every sense, and the sensible split depends on when you actually need the money, not on which sounds more prudent.
What this means between now and April 2027
The current rules run until 5 April 2027, so this tax year is the last in which under-65s can put the whole £20,000 into cash. The limit also applies to what you pay in each year rather than to what you have already accumulated. A technical consultation is under way and the regulations are due to be laid in the autumn, so some of the finer mechanics may yet be tidied up before the start date.
The useful work in the meantime is not rearranging anything in a hurry. It is getting clear on which of your savings are genuinely short-term money and which have been sitting in cash out of habit. That distinction is what makes the April 2027 decision an easy one when it arrives.
In summary
From 6 April 2027 under-65s will be able to pay £12,000 a year into a cash ISA rather than £20,000, with the overall allowance unchanged and savers aged 65 and over unaffected. New rules will also charge interest on cash held inside a non-cash ISA and block transfers into cash ISAs. None of it forces you to invest, but it does ask a question of anyone who has used cash as the default, and the answer depends on when you need the money rather than on which option feels safer.
If you are wondering how much of your savings genuinely needs to stay in cash, and what the alternatives would mean for you, that is a conversation we have often. Do give the ACJ team a call and we can look at it properly with you before the rules change.