The Cash ISA Cap Is Changing in April 2027 — What It Means If You’re Under 65

If you’re under 65 and you keep money in a cash ISA, the rules change on 6 April 2027. It’s the biggest shake-up to ISAs in years, and it lands squarely on people your age. Here’s what’s actually changing, what it means in practice, and what you can do about it before the deadline.

What’s changing

Right now you can put up to £20,000 a year into ISAs, and you can put every penny of that into a cash ISA if you want to.

From 6 April 2027, for anyone under 65:

• The overall ISA allowance stays at £20,000.
• But only £12,000 of it can go into a cash ISA.
• The remaining £8,000 has to go into a Stocks & Shares ISA, an Innovative Finance ISA, or a Lifetime ISA — or it goes unused.

If you’re 65 or over, nothing changes: you keep the full £20,000 cash allowance. So this is, quite specifically, a change aimed at younger savers.

Why the government is doing this

The stated aim is to nudge people from cash saving toward investing. The reasoning goes: the UK holds an unusually large amount of household money in cash, cash tends to lose value against inflation over long periods, and that money isn’t working in the economy either.

Whether you agree with the policy or not, the practical effect is the same — the tax-free wrapper for cash is getting smaller for you specifically.

Does this actually affect you?

Be honest about the numbers. For most people in their teens and twenties:

• If you save less than £12,000 a year in cash — which is the overwhelming majority of people starting out — this changes nothing at all for you. You’ll never hit the new cap.
• If you’re saving hard for a house deposit and putting large sums into cash each year, this is worth planning around.
• If you have a lump sum — inheritance, a matured Child Trust Fund, a big bonus — the 2026/27 tax year is your last chance to shelter up to £20,000 of it in cash.

The honest answer for most readers is: not yet, but know it’s coming. Don’t let headlines panic you into moving money you’ll need soon into investments.

The bit that matters more than the cap

There’s a genuine trade-off here and it’s worth being clear about it.

Cash is the right home for money you’ll need within about five years. Your emergency fund, next year’s rent deposit, a holiday, a car. The value doesn’t move. That certainty is the whole point, and no cap changes it — you can still hold cash outside an ISA, you just might pay tax on the interest above your Personal Savings Allowance.

Investing suits money you genuinely won’t touch for five years or more. It can fall as well as rise, and over short periods it very often does. The policy is pushing people toward investing; that doesn’t mean investing is right for every pot of money you own.

What you can actually do

1. Work out whether you’re anywhere near £12,000 a year in cash savings. If you’re not, file this away and get on with your life.
2. If you have a lump sum sitting in a normal savings account, using your 2026/27 cash ISA allowance before 5 April 2027 shelters it permanently — money already inside an ISA stays inside it.
3. Check whether a Lifetime ISA fits if you’re saving for a first home and you’re 18–39. The 25% government bonus is worth more than the cap change either way. See our LISA guide for the catches.
4. Learn how investing works before April 2027, not after. If part of your allowance is going to have to go somewhere other than cash, you want to understand it in advance rather than making a rushed decision at a deadline.

Common questions

Does money already in my cash ISA get moved?

No. This is a cap on new contributions from April 2027. Money already sheltered stays sheltered.

Can I still hold more than £12,000 in cash overall?

Yes. You can hold as much cash as you like — the cap is on how much of your annual ISA allowance can go into cash. Interest earned outside an ISA may be taxable above your Personal Savings Allowance.

What if I’m 64 now?

The full £20,000 cash allowance applies from 65. Between now and then you’d be subject to the £12,000 cap.

This is education, not financial advice. Rules change and the detail can shift before implementation — check the current position on GOV.UK before acting, and your capital is at risk when you invest.