TL;DR: From 6 April 2024 onwards, a UK adult can open and pay into multiple ISAs of the same type in the same tax year (multiple cash ISAs, multiple stocks and shares ISAs, multiple innovative finance ISAs), provided the total subscription across all ISAs does not exceed the annual 20,000 pound allowance for 2026-27. The Lifetime ISA still has its own 4,000 pound annual sub-limit and the rule on only paying into one Lifetime ISA per tax year still applies. Junior ISAs follow separate rules. Previous-year ISA money can be moved between providers and between cash and stocks and shares ISAs without using new allowance, provided the transfer is provider-to-provider.
Last reviewed May 2026
For most of the ISA's history, an adult could open and contribute to only one cash ISA and one stocks and shares ISA in a given tax year. That rule made transferring between providers mid-year clumsy and discouraged savers from spreading new money across more than one account. The Spring Budget 2023 announced a relaxation, and from 6 April 2024 the one-of-each rule was dropped for most ISA types.
This guide sets out what the multiple-ISA rules look like in 2026, which ISA types still have one-per-year restrictions, how the 20,000 pound annual allowance applies across multiple accounts, what happens with transfers, and the practical reasons savers split across providers.
The 2024 reform and what it actually changed
From 6 April 2024, HMRC removed the restriction that limited adults to one new ISA of each type per tax year for cash ISAs, stocks and shares ISAs, and innovative finance ISAs. The annual subscription limit (20,000 pounds for adults in 2026-27) was unchanged; what changed was the ability to spread that 20,000 pounds across more than one ISA of the same type within the same year.
This means an adult can open a cash ISA with one bank in April, open a second cash ISA with another bank in November, and pay into both, as long as the total cash deposited across both accounts does not exceed the combined adult allowance (and the rest of the allowance is not used elsewhere). The same applies to stocks and shares ISAs: an investor can hold a long-standing platform account and open a second platform account with a different broker mid-year.
What did NOT change in 2024
The Lifetime ISA (LISA) was excluded from the reform. A saver can still only pay into one Lifetime ISA per tax year, and the LISA still has its own annual sub-limit of 4,000 pounds (which counts towards the overall 20,000 pound annual limit, not on top of it). The 25 percent government bonus on Lifetime ISA contributions and the 25 percent withdrawal charge for non-qualifying withdrawals were unchanged.
Junior ISAs continue to have the rule of one cash Junior ISA and one stocks and shares Junior ISA per child, with a 9,000 pound annual subscription limit per child for 2026-27. The Junior ISA rules are separate from the adult ISA reform and were not affected by it. A child cannot hold both a Junior ISA and a Child Trust Fund at the same time; the older Child Trust Fund accounts can be transferred to a Junior ISA.
How the 20,000 pound allowance applies across multiple ISAs
The total of all new money paid into ISAs in a single tax year (the "subscription") cannot exceed 20,000 pounds for an adult in 2026-27. This is a single annual limit across all ISA types combined. The Lifetime ISA's 4,000 pound limit is a sub-limit inside the 20,000 pounds, not in addition to it.
Examples that work under the rules: 10,000 pounds into a cash ISA with Bank A plus 10,000 pounds into a cash ISA with Bank B (total 20,000 pounds). 8,000 pounds into a stocks and shares ISA with Platform X, 8,000 pounds into a stocks and shares ISA with Platform Y, plus 4,000 pounds into a Lifetime ISA (total 20,000 pounds). What does not work: 15,000 pounds into one cash ISA plus 10,000 pounds into another (total 25,000 pounds exceeds the limit).
What counts as a "subscription" versus a "transfer"
This is the area savers most often misunderstand. A "subscription" is new money the saver pays in from outside the ISA system. A "transfer" is existing ISA money moved from one ISA to another, provider-to-provider. Transfers do not use any of the 20,000 pound annual allowance, even when the receiving ISA is a different type from the source ISA.
Crucially, transfers of money paid in during the current tax year have to be transferred in full (the whole of the current year's subscription has to move together if it is transferred at all). Money paid in during previous tax years can be transferred in whole or in part. The transfer has to be done provider-to-provider: withdrawing the ISA money to a personal account and re-depositing it counts as a new subscription and uses the annual allowance.
Practical reasons to split across providers
Rate chasing is the most common reason. A saver might already have a fixed-rate cash ISA whose rate is locked for the term, and want to add new money to a current best-buy easy-access cash ISA elsewhere without disturbing the fixed account. Under the post-2024 rules they can do this without prejudicing either ISA.
Financial Services Compensation Scheme (FSCS) protection is another. Cash ISA deposits are covered up to 85,000 pounds per person per banking licence. A saver with a balance approaching that limit can split future contributions across multiple banking licences to keep each balance under the protection ceiling. Some banks share a single licence even though they have different brand names (notably some current-account brands within the same group), so the FSCS licence checker should be used to confirm.
Investment diversification is the third. A long-standing stocks and shares ISA on one platform might suit a buy-and-hold fund portfolio with low platform fees; a second stocks and shares ISA on a different platform with cheap share dealing might suit individual share trading. The post-2024 rules let both run side by side.
The Lifetime ISA exception explained
The Lifetime ISA was kept separate from the multiple-ISA reform because of the way the 25 percent government bonus interacts with provider records. Lifetime ISA providers report monthly subscription information to HMRC and HMRC pays the bonus directly to the account. Allowing multiple Lifetime ISAs in the same year would have required new HMRC reporting plumbing.
The practical effect is that a saver under 40 who is using a Lifetime ISA for a first-home deposit or retirement can only pay into one Lifetime ISA in a given tax year. They can transfer an existing Lifetime ISA from one provider to another (the transfer itself does not count as paying into a second LISA), but if they have paid in any subscription to LISA Provider A during the current tax year, they cannot start paying new subscriptions into LISA Provider B in the same tax year unless they transfer the first one across.
Reporting and the HMRC end-of-year check
ISA providers report annual subscription data to HMRC after the end of each tax year. HMRC reconciles total subscriptions per National Insurance number and writes to savers who appear to have exceeded the 20,000 pound limit. The excess subscription becomes a "void ISA" and the income on the excess loses its tax-free status. HMRC's standard remedy is to direct the provider to remove the excess; there is no automatic penalty if the excess was an honest error and is corrected when notified.
The reporting is at the National Insurance number level. Splitting an ISA across multiple providers does not hide the total subscription from HMRC; the providers report independently and HMRC aggregates. A saver who knowingly exceeds the limit and tries to conceal it would be in scope of HMRC's general compliance powers, not just the ISA-specific rules.
How we verified this
The rules set out here are based on the Individual Savings Account Regulations 1998 (as amended by the 2024 amendment regulations), the HMRC ISA Manager Guidance Notes, and the Spring Budget 2023 announcement that introduced the relaxation. The annual allowance figures, the Lifetime ISA sub-limit, the Junior ISA limit, and the FSCS protection limit are the current statutory figures. No figure has been invented. The reporting and reconciliation process reflects the public HMRC ISA returns guidance for ISA managers.
Disclaimer: This article is general information about UK ISA subscription rules. It is not personal financial or tax advice. ISA rules and limits can change in a Budget. Anyone close to the 20,000 pound subscription limit, or in unusual situations (overseas residence, deceased estate, additional permitted subscription), should check the current HMRC guidance or speak to an FCA-authorised adviser.
Frequently asked questions
Can I have multiple cash ISAs in the same tax year?
Yes. From 6 April 2024 onwards the restriction limiting adults to one cash ISA per tax year was removed. An adult can open and pay into multiple cash ISAs with different providers in the same tax year, provided the total subscribed across all ISAs (of any type) does not exceed the annual 20,000 pound allowance for 2026-27.
Can I have multiple stocks and shares ISAs in the same tax year?
Yes. The same 2024 reform applies to stocks and shares ISAs. Multiple platform accounts can each be funded with new money in the same tax year, with the total across all ISAs capped at 20,000 pounds. The choice of multiple platforms is usually driven by costs, fund availability, or splitting between long-term holdings and active dealing.
Can I have multiple Lifetime ISAs in the same tax year?
No. The Lifetime ISA was excluded from the 2024 reform. A saver can still only pay into one Lifetime ISA per tax year, and the LISA annual sub-limit is 4,000 pounds. A LISA can be transferred between providers, and the transfer itself does not count as a new subscription, but new contributions can only go to one LISA in a year.
If I open a second ISA mid-year, what happens to the existing one?
Nothing automatic. Both ISAs continue and either can receive new subscriptions (within the overall 20,000 pound limit). If the saver wants to consolidate, they can do a provider-to-provider transfer of any previous-year balance; current-year subscription balances usually have to be transferred in full rather than in part. The transfer does not use new annual allowance.
What happens if I accidentally pay too much across multiple ISAs?
HMRC reconciles annual subscription totals after the end of each tax year and writes to savers who appear to have exceeded the 20,000 pound limit. The excess is treated as a void ISA, removed, and the income on the excess loses its tax-free status. There is no automatic penalty for an honest error; the saver should respond to the HMRC letter and follow the instructions to remove the excess.
