Someone messaged me this week in a mild panic: "Is it true the government is cutting my ISA allowance to £12,000?"
Short answer: no.
Longer answer: the ISA rules ARE changing in April 2027, the headlines are doing a terrible job of explaining it, and I'd bet money that someone at your work or in your family group chat has it wrong right now.
So here it is in plain English. Read this once and you'll understand the new rules better than most of the people writing about them. Save it, forward it, win the group chat argument.
First, the 30 second version
Your total ISA allowance is still £20,000 a year. Nothing taken away.
What changes from April 2027: if you're under 65, only £12,000 of it can go into a cash ISA. The rest of your allowance still exists. It just has to be invested (in a stocks and shares ISA, for example) to stay tax free.
That's it. That's the change everyone is shouting about.
You didn't lose £8,000. The government is telling you where £8,000 of it can't sit anymore.
Before and after, side by side
| Now | From 6 April 2027 |
Total ISA allowance | £20,000 | £20,000 (unchanged) |
Cash ISA (under 65) | up to £20,000 | up to £12,000 |
Cash ISA (65 and over) | up to £20,000 | up to £20,000 (unchanged) |
Stocks & shares ISA | up to £20,000 | up to £20,000 (unchanged) |
Lifetime ISA | up to £4,000 | up to £4,000 (replaced by a new First Time Buyer ISA from April 2028) |
So an under-65 saver in the 2027/28 tax year could do, for example: £12,000 into a cash ISA and £8,000 into a stocks and shares ISA. Full £20,000 still sheltered from tax.
Two more bits of small print that will save you a headache:
Your existing savings are safe. The cap only applies to new money you add from April 2027. Everything already sitting in your cash ISA stays tax free and untouched, and you can still transfer old balances between providers to chase better rates.
Transfers become a one way street. From April 2027, under-65s can move money from a cash ISA into a stocks and shares ISA, but not the other way round. That restriction falls away from the start of the tax year you turn 65. So if you think you'll want money in cash, don't count on shuffling it back later.
Why is the government doing this?
Simple: they want savers to become investors.
Billions of pounds sit in cash ISAs earning modest interest and slowly losing to inflation. The government wants more of that money in markets, funding companies and (they hope) growing faster for savers over the long run. So instead of asking nicely, they've capped the cash bit.
You can think that's sensible or you can think it's heavy handed. Plenty of clever people are arguing both. Either way, the rule is the rule, and it's coming in April 2027.
The trap most people will fall into
Here's the bit the headlines are barely covering, and honestly it's the most important part of this email.
Some people will think: "Fine, I'll open a stocks and shares ISA, put my extra £8,000 in it, and just leave it sitting there as cash. Ha. Loophole."
The government thought of that.
⚠️ From April 2027, interest earned on cash sitting inside a stocks and shares ISA gets charged at 22%. And unlike normal savings, your Personal Savings Allowance doesn't help you here, because it has never applied inside ISAs. This charge applies at any age, even once you're over 65.
In other words: cash parked in an investment ISA becomes a worse deal than cash in an actual cash ISA. The message from the Treasury could not be clearer. If it's in the investment wrapper, they want it invested.
One wrinkle for the nerds (I say that with love): returns from money market funds inside a stocks and shares ISA escape the 22% charge, but from April 2027 you won't be allowed to hold your entire stocks and shares ISA in them. Cash-like hiding places are being closed off one by one.
So what should you actually do?
If you're a cash saver under 65: nothing changes until April 2027, and you can still use the full £20,000 cash allowance this tax year and next. If cash is genuinely what you want (house deposit soon, emergency fund, you sleep better), use those allowances while they're at full size. Savers clearly got the memo already: around £12 billion went into cash ISAs in April alone.
If your money is sitting in cash with no plan: this is your nudge. Money you won't touch for 5+ years has historically done far better invested in boring, diversified funds than sitting in cash. You don't need to become a stock picker. A simple global index fund inside a stocks and shares ISA is how most sensible people do it.
If you're 65 or over: genuinely, relax. Your £20,000 cash ISA allowance survives untouched. Just don't leave cash earning interest inside a stocks and shares ISA, because that 22% charge doesn't care how old you are.
If you're a first time buyer: heads up, the Lifetime ISA is being replaced by a new First Time Buyer ISA in April 2028. Nobody is taking your existing LISA away though. You can still open one now, keep the £4,000 a year limit and the 25% government bonus, and keep paying in under the current rules even after the new product arrives. If you're eligible today, it's still one of the best deals in UK personal finance. Just know its successor is coming.
💡 This week's takeaway: You still get £20,000 of tax free ISA space every year. From April 2027, £8,000 of it simply can't sit in cash if you're under 65. The smartest response for most people isn't outrage. It's finally learning how to invest that £8,000 properly, and you've got until April 2027 to learn at your own pace. That's what this newsletter is here for.
Know someone who thinks their ISA allowance got cut? Forward them this email. You'll save them a panic and me a repeat explanation.
📊 Want to keep an eye on all this yourself?
Follow the markets, check the latest inflation numbers and compare savings rates, all in plain English, on our free app simplemarket.app
And if you were sent this by a friend, this is what Money Simplified does every week: money news translated into normal human language. You can join for free at moneysimplified.uk.
Until next week,
Money Simplified
Making money make sense.
📬 Enjoying Money Simplified?
⚠️ Disclaimer: This newsletter is for education only and is not financial advice or a personal recommendation. Rules described are based on government announcements as of July 2026 and could change before or after April 2027. Tax treatment depends on individual circumstances. Investments can fall as well as rise, and past performance doesn't guarantee future results. Consider speaking to a regulated financial adviser before making decisions.
