Can You Open A New Cash ISA Each Tax Year
A new tax year creates a fresh ISA subscription allowance, but it does not wipe away or reset the accounts you already hold. The useful planning question is whether opening another Cash ISA on or after 6 April improves rate, access or transfer flexibility enough to justify another account. Old ISA balances can remain tax-free, be left in place or be transferred separately from the new year's subscriptions.
A new tax year gives you a new subscription allowance
You can open a new Cash ISA in a new tax year if you meet the eligibility rules and the provider accepts your application. The tax year runs from 6 April to 5 April. Your unused subscription allowance does not carry forward, so 6 April starts a fresh allowance rather than adding unused capacity from the previous year.
Your old Cash ISAs do not expire when the tax year changes. They can remain open and continue earning tax-free interest. You can leave them where they are, transfer them, or consolidate them later using the official ISA transfer process.
Opening a new account does not require closing the old one
A common misconception is that each tax year should have exactly one Cash ISA. Current ISA rules allow more flexibility. You can keep older ISAs and, since April 2024, subscribe to more than one Cash ISA in the same tax year as long as your total subscriptions stay within the relevant limits and provider rules are satisfied.
The practical reason to open a new account is usually better terms, not calendar neatness. Check whether the new product improves the rate, access or transfer flexibility enough to justify another account to manage.
Worked example across two tax years
Imagine you subscribed £15,000 to a Cash ISA during 2025/26. On 6 April 2026, that £15,000 remains inside its wrapper. You then open a different Cash ISA and add £20,000 of new money during 2026/27. The old balance does not reduce the new year's £20,000 overall ISA subscription allowance.
If the old account becomes uncompetitive, you can ask the new provider to transfer it. A formal transfer preserves the wrapper; withdrawing the £15,000 yourself and redepositing it could consume new allowance or create an avoidable problem.
Rate chasing needs a transfer plan
Opening a new Cash ISA every April can become messy if you never review the old accounts. Keep a maturity diary for fixed terms and record which providers accept transfers. An old ISA that drops to a poor follow-on rate can erode years of tax-efficient saving without any obvious warning.
Once a year, compare the full ISA portfolio rather than only the new allowance. The right move may be to open a new account, transfer old money, or do neither. The answer depends on the rate gap, access needs and any early-exit cost.
What changes from 6 April 2027
For 2026/27 the overall ISA subscription limit is £20,000. From 6 April 2027 the annual Cash ISA limit is scheduled to be £12,000 for people under 65, while those aged 65 or over retain a £20,000 Cash ISA limit. The overall ISA limit remains £20,000.
That reform changes how much new cash can enter the wrapper for younger savers, not whether they can keep old Cash ISAs. Existing protected balances remain relevant, so transfer quality and maturity management become even more important.
BankOfferScout editorial view
We would open a new Cash ISA each tax year only when the new account solves a real problem: a better rate, a better access profile, or a more suitable home for new subscriptions. Calendar habit alone is not a reason. The more important annual routine is to review old fixed maturities and weak follow-on rates so previous years' ISA money does not drift into poor value.
Treat the arithmetic in Can You Open A New Cash ISA Each Tax Year as a method rather than a quote. Except where a statutory limit is stated, the example figures are illustrative; rerun them with the provider rate available to you, your own balance, tax circumstances and the timing of any withdrawal.
Questions readers often ask
Do old Cash ISAs close at the end of the tax year?
No. They can remain open and continue to hold tax-free savings.
Can I open another Cash ISA on 6 April?
Yes, subject to provider eligibility and the ISA subscription rules for the new tax year.
Does unused ISA allowance carry forward?
No. Unused annual ISA subscription allowance is lost when the tax year ends.
Sources and verification
The tax-year timing in this guide comes from GOV.UK's current ISA rules. For any new account, the provider's own opening and funding conditions control what can actually be done after 6 April. The April 2027 Cash ISA reform affects the amount of new cash that can be subscribed by age group, but it does not close older ISAs or cancel their tax status.
- GOV.UK ISA overview for 2026/27
- GOV.UK Cash ISA limit change from April 2027
- FSCS current deposit protection limit
- MoneyHelper Cash ISA guidance
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