If you've been searching "What are the ISA reforms for 2027?" or "How will the new ISA rules affect me?", you're not alone. The UK Government has announced significant changes to Individual Savings Accounts (ISAs) that will come into effect from 6 April 2027.
The headline change is a reduction in the Cash ISA allowance for people under 65, alongside new anti-circumvention rules designed to prevent investment ISAs from being used as an alternative to Cash ISAs.
Here's everything you need to know.
At a glance: What are the ISA reforms for 2027?
From 6 April 2027:
| Current Rules | New Rules (from April 2027) |
|---|---|
| Cash ISA allowance: £20,000 | Cash ISA allowance: £12,000 for savers under 65 |
| Overall ISA allowance: £20,000 | Overall ISA allowance remains £20,000 |
| Stocks & Shares ISA allowance: up to £20,000 | No change |
| No restrictions on using Stocks & Shares ISAs to hold cash | New anti-circumvention rules introduced |
| Existing ISA savings remain tax free | Existing ISA savings remain unaffected |
The Government says these reforms are intended to encourage more long-term investing while maintaining tax-efficient saving options.
Why are ISA rules changing?
The Government believes that many people hold more cash than they need in savings accounts, potentially missing out on higher long-term returns from investing.
By reducing the amount that can be paid into a Cash ISA, policymakers hope to encourage more people to consider investing through a Stocks & Shares ISA, while still preserving the overall annual ISA allowance of £20,000.
The reforms are also designed to stop savers using investment ISAs purely as a workaround for the new Cash ISA limits.
What is changing with Cash ISAs?
For most savers, this is the biggest change.
From 6 April 2027, anyone under the age of 65 will be able to pay a maximum of £12,000 each tax year into a Cash ISA.
Previously, the full annual ISA allowance of £20,000 could be placed into cash.
The remaining £8,000 of the annual allowance can still be used, but it would need to be invested through another eligible ISA product, such as a Stocks & Shares ISA.
Is the overall ISA allowance changing?
No.
The annual ISA allowance remains £20,000.
This means you can still save or invest up to £20,000 tax-efficiently each tax year.
The only change is how much of that allowance can be allocated to a Cash ISA if you're under 65.
Who will be affected?
The reforms won't affect everyone equally.
You're most likely to notice the changes if you:
- regularly save more than £12,000 into a Cash ISA each year
- prefer keeping all your ISA savings in cash rather than investments
- temporarily leave large cash balances inside a Stocks & Shares ISA
- frequently transfer money between different ISA types
If you already invest most of your annual ISA allowance, the practical impact may be relatively small.
What are the new anti-circumvention rules?
Alongside the lower Cash ISA limit, the Government is introducing several measures to prevent savers from using investment ISAs as a substitute for Cash ISAs.
Restrictions on cash held inside Stocks & Shares ISAs
Many investors temporarily hold cash while deciding where to invest it.
Under the new rules, interest earned on cash balances held within non-Cash ISAs will generally be subject to a 22% charge, discouraging long-term cash holdings inside investment ISAs.
Temporary cash held while investments are bought or sold will still be permitted.
Restrictions on ISA transfers
Previously, it would have been possible to subscribe to a Stocks & Shares ISA before transferring the money into a Cash ISA.
The new legislation prevents this route being used to exceed the £12,000 Cash ISA limit for savers under 65.
Changes to money market funds
The reforms also address investments that closely resemble cash savings.
Money Market Funds can still form part of an investment portfolio, but they cannot be used in a way that effectively recreates a Cash ISA within a Stocks & Shares ISA.
What happens to my existing Cash ISA?
One of the biggest concerns among savers is whether existing ISAs will be affected.
The answer is no.
Money already held in your Cash ISA remains tax free.
The new limits only apply to new subscriptions made from 6 April 2027 onwards.
If you've built up substantial ISA savings over many years, those balances continue to benefit from the existing tax advantages.
What if I'm over 65?
If you're aged 65 or over, the Government has confirmed you'll still be able to contribute up to £20,000 each year into a Cash ISA.
This means the reduced £12,000 Cash ISA limit only applies to savers under 65.
Example: How the ISA reforms could affect you
Sarah contributes £20,000 into a Cash ISA every year.
Before April 2027
- £20,000 into a Cash ISA
- Entire allowance held as cash
- All interest remains tax free
From April 2027
- £12,000 into a Cash ISA
- Up to £8,000 could be invested in a Stocks & Shares ISA
- Overall ISA allowance remains £20,000
Sarah can still use her full ISA allowance, but she can no longer hold all of it in cash unless she qualifies for the over-65 exemption.
Should I change how I save?
There's no immediate need to change your savings strategy.
However, if you normally maximise your Cash ISA allowance each year, it's worth understanding how the reforms could affect future contributions.
Depending on your financial goals, you may wish to:
- continue using a Cash ISA for short-term savings
- consider investing part of your ISA allowance for longer-term growth
- review your ISA strategy before the reforms take effect in April 2027
Remember that while investing offers the potential for higher returns, the value of investments can go down as well as up.
FAQs about Accountants in Cambridge
When do the ISA reforms start?
The new rules come into effect on 6 April 2027, the start of the 2027/28 tax year.
What is the new Cash ISA allowance?
For savers under 65, the annual Cash ISA subscription limit will reduce from £20,000 to £12,000.
Is the £20,000 ISA allowance being abolished?
No.
The overall ISA allowance remains £20,000.
Only the amount that can be paid into a Cash ISA is changing.
Can I still have a Stocks & Shares ISA?
Yes.
The reforms do not reduce the Stocks & Shares ISA allowance.
Will my existing Cash ISA lose its tax-free status?
No.
Existing ISA savings remain protected and continue earning tax-free interest.
Can I transfer my existing Cash ISA?
Yes, although the new contribution limits and anti-circumvention rules may affect how future subscriptions and transfers work after April 2027.
Will Junior ISAs change?
The announced reforms focus on adult ISAs. At the time of writing, no equivalent changes have been announced for Junior ISAs.
Does this affect Lifetime ISAs?
The Government's announcement relates specifically to Cash ISAs and anti-circumvention measures. Lifetime ISA rules remain unchanged under the current proposals.
Why is the Government introducing these reforms?
According to HM Treasury, the changes are intended to encourage greater long-term investment while preventing savers from using investment ISAs primarily as cash savings accounts.
Final thoughts
The 2027 ISA reforms represent one of the most significant updates to ISA rules in recent years. While the overall annual ISA allowance remains unchanged, the reduction in the Cash ISA limit means many savers may need to rethink how they use their tax-free allowance.
For some, the impact will be minimal. For others—particularly those who regularly maximise their Cash ISA contributions—the reforms may prompt a broader review of their savings and investment strategy.
As further guidance becomes available ahead of April 2027, it's worth keeping up to date with the latest announcements and reviewing your options well before the new rules come into force.
