How Many ISAs Can I Have? Rules, Limits and Exceptions

There is no limit on how many ISAs a UK resident can hold. The governing rule is the annual ISA allowance of £20,000 per person, per tax year, which must not be exceeded across all accounts combined.

Since 6 April 2024, savers can open and contribute to multiple ISAs of the same type in one tax year. From April 2027, a new sub-limit applies to cash ISAs for savers under 65.

Key Takeaways

• There is no cap on the number of ISAs a saver can hold – the £20,000 annual allowance is the only hard limit, and it is shared across all accounts.
• Since 6 April 2024, UK savers can open and contribute to multiple ISAs of the same type within the same tax year, including multiple cash ISAs or multiple stocks and shares ISAs.
• The Lifetime ISA is the critical exception, only one Lifetime ISA can receive contributions per tax year, with a £4,000 sub-limit that counts toward the overall £20,000 allowance.
• From 6 April 2027, the annual cash ISA allowance for savers under 65 will be cut from £20,000 to £12,000, following the Autumn Budget 2025 announcement by Chancellor Rachel Reeves. Savers aged 65 and over retain the full £20,000 cash ISA allowance.

What Is an ISA?

An ISA (Individual Savings Account) is a UK savings or investment account that shelters your money from Income Tax, Dividend Tax, and Capital Gains Tax. You can hold cash, stocks and shares, or a mix of both, up to the annual £20,000 allowance.

There’s no tax to pay on interest, dividends, or growth inside an ISA, however much it earns.

How Many ISAs Can I Have in a Single Tax Year?

There is no limit on the number of ISAs a UK saver can hold or open in a single tax year. Total contributions across all ISAs must not exceed £20,000, the annual ISA allowance set by HMRC under the Individual Savings Account (ISA) Regulations 1998.

Since 6 April 2024, contributing to multiple ISAs of the same type within the same tax year is fully permitted.

The tax year runs from 6 April to 5 April the following year. Any portion of the £20,000 allowance not used by 5 April is permanently lost. The ISA subscription rules do not permit unused allowance to carry forward into the next tax year.

Many savers assume that unused allowance rolls over; it does not. Before April 2024, savers could only pay into one ISA of each type per tax year.

The 2023 Autumn Budget changed those rules, removing the one-per-type restriction for cash ISAs, stocks and shares ISAs, and Innovative Finance ISAs.

The allowance cap, not the number of accounts, is what determines how many ISAs a saver can use in any given tax year.

Can I Have More Than One ISA?

Yes. Since 6 April 2024, you can hold and pay into more than one ISA, including more than one of the same type, as long as your total contributions across all of them stay within the £20,000 annual allowance.

The only exception is the Lifetime ISA, which restricts contributions to one account per tax year.

What Types of ISA Can I Have and How Many of Each?

How many cash ISAs can I have? As many as you like. Since April 2024, there’s no cap on the number of cash ISAs you can open or pay into in a single tax year, provided your total cash ISA contributions plus any other ISA contributions don’t exceed £20,000 combined.

The same applies to Stocks and Shares ISAs and Innovative Finance ISAs. If you hold a Help to Buy ISA, it is classed as a cash ISA.

Under the new rules, you can pay into both a Help to Buy ISA and a standard cash ISA in the same tax year, provided your combined contributions do not exceed the overall £20,000 limit, and you stick to the strict monthly deposit limits of the Help to Buy scheme.

How many stocks and shares ISAs can I have? There’s no limit here either; you can open and contribute to multiple stocks and shares ISAs in the same tax year, as long as the combined total across all your ISAs stays within £20,000.

The Lifetime ISA is the critical exception. Only one Lifetime ISA (LISA) may receive contributions per tax year, and the annual sub-limit is £4,000 regardless of how much of the overall £20,000 allowance remains unused.

The Financial Conduct Authority (FCA) regulates all ISA providers in the UK. Each ISA type carries its own eligibility conditions and restrictions, separate from the question of how many accounts a saver holds.

The table below sets out how many ISAs of each type a saver can hold and contribute to in 2026/27.

The Junior ISA (JISA) allowance of £9,000 per child is entirely separate from the adult £20,000 allowance. A child may hold one Junior Cash ISA and one Junior Stocks and Shares ISA simultaneously.

If a child holds a Child Trust Fund (CTF), it cannot be held alongside a Junior ISA, but it can be transferred into one. 

Can I Have Two ISAs With £20,000 in Each or £40,000 Over Two Years?

Yes, but only by using the £20,000 allowance across two separate tax years, not within a single one. Two ISAs can each hold £20,000 if contributions were made in different tax years. No single tax year permits more than £20,000 in total ISA contributions, regardless of how many accounts are held.

Savers researching this question often confuse the account balance with the annual contribution limit; the two are not the same thing.

A saver who contributed £20,000 in 2025/26 and a further £20,000 in 2026/27 holds £40,000 in ISAs in total, spread across as many accounts as they choose.

The steps below show exactly how the £20,000 ISA allowance works across tax years.

1. The £20,000 limit applies per tax year, 6 April to 5 April, per person, not per account.
2. Unused allowance from one tax year cannot be rolled into the next. It expires at midnight on 5 April.
3. Each new tax year brings a fresh £20,000 allowance regardless of how many ISAs are already held or what balances they carry.
4. Over two tax years, a saver can contribute up to £40,000 in total, £20,000 in year one and £20,000 in year two, split across as many ISAs as chosen.
5. Two ISAs can each hold £20,000 if funded in separate tax years. This is fully compliant with HMRC rules.
6. The total across all accounts in any one tax year is always capped at £20,000. The number of accounts held is irrelevant to that ceiling.

How Many ISAs Can I Have With the Same Bank or Provider?

Legally, there is no limit, but in practice, the exact number depends entirely on your bank’s internal policies. While HMRC’s April 2024 rule changes allow you to hold multiple ISAs of the same type, financial institutions are not legally obligated to offer them. Each provider sets its own operational limits.

Because of this, you can be completely within HMRC rules and still be declined a second cash ISA or stocks and shares ISA by your current bank. The rule change created the option for individual providers to decide whether to offer it, it didn’t create an obligation.

Before assuming a second cash ISA or second stocks and shares ISA is available with an existing provider, you should verify the following:

• Whether the provider explicitly permits multiple same-type ISAs under their current terms, check online or call the provider directly before making an application.
• Whether a second account would be a new standalone ISA or a sub-account sitting under the same product wrapper, which affects how interest and withdrawals are handled.
• Whether the provider applies different interest rates to additional accounts of the same type held with them compared to the primary account.
• Whether their flexible cash ISA terms apply across multiple accounts held with them, or only to the first account opened.
• Whether fixed-rate ISA terms restrict the ability to open a second fixed-rate ISA with the same provider in the same tax year.

Always confirm directly with a specific bank before proceeding.

How Much Can I Put in an ISA? Can I Put £20,000 in Every Year?

How much can you put in an ISA? Up to £20,000 per tax year, and that allowance resets every 6 April. A saver who contributes the full £20,000 in 2025/26 starts with a fresh £20,000 allowance on 6 April 2026.

Key allowance facts to remember:

• The limit is combined: The £20,000 figure covers total contributions across all ISA types combined. A saver placing £4,000 into a Lifetime ISA has £16,000 remaining to allocate to other ISA types.
• The limit is frozen: According to MoneyHelper, the government-backed financial guidance body, the £20,000 annual ISA allowance is confirmed frozen until 2030.
• Inflation impact: In practice, that freeze means the real value of the allowance is eroding year on year, a consideration for savers deciding how urgently to maximise contributions.

Savers who contributed the full allowance every year since 2017 will have sheltered up to £180,000 from Income Tax, Dividend Tax, and Capital Gains Tax inside their ISA wrappers by the 2025/26 tax year.

What Is the Cash ISA Allowance Changing to and When?

From 6 April 2027, the annual cash ISA allowance for savers under 65 will be reduced from £20,000 to £12,000. Savers aged 65 and over retain the full £20,000 cash ISA allowance. The overall ISA allowance of £20,000 remains entirely unchanged, only the cash component carries a new sub-limit for younger savers.

Chancellor Rachel Reeves confirmed the change as part of the Autumn Budget 2025, alongside wider tax measures such as the investment ISA levy.

HM Treasury’s stated rationale is to redirect savings toward investment, with the remaining £8,000 of the overall allowance designated for investment ISAs such as stocks and shares ISAs.

MoneySavingExpert confirmed the age-65 exemption following advocacy by Martin Lewis, who had publicly called for older savers to be protected from the change.

The cash ISA allowance reduction from April 2027 does not reduce the overall £20,000 ISA allowance. For under-65s, it redirects £8,000 of that allowance exclusively toward investment ISAs.

Savers who currently use the full £20,000 as a cash ISA will need to place the remaining £8,000 into a stocks and shares ISA, Innovative Finance ISA, or Lifetime ISA from 2027/28 onward.

Savers under 65 who currently maximise their cash ISA have until 5 April 2027 to do so under the existing rules, and should review their ISA strategy before that date.

How Does HMRC Know How Many ISAs You Have?

Every HMRC-approved ISA manager is required to submit an annual ISA return to HMRC at the end of each tax year. HMRC cross-references those returns across all providers to identify any saver whose combined ISA contributions have exceeded the £20,000 annual allowance.

No single ISA provider has visibility of what a saver holds with other providers. The ISA overpayment detection mechanism operates at HMRC level, not at the provider level.

This is why tracking total contributions across all accounts is the saver’s own responsibility during the tax year, not the bank’s. The process HMRC follows when a breach is identified runs as follows.

• Every ISA manager approved by HMRC must submit an annual ISA return covering the tax year ended 5 April, reporting all contributions made by each saver.
• HMRC cross-references those returns across all providers to identify any individual whose combined contributions exceed £20,000 in a single tax year.
• If an ISA overpayment is detected, HMRC writes to the saver directly with instructions to withdraw the excess amount from the relevant account.
• Any income or gains earned on the overpaid amount during the period it sat in the ISA wrapper may be subject to Income Tax or Capital Gains Tax.
• The saver, not the provider, bears responsibility for tracking total ISA contributions across all accounts held in a given tax year.

Keeping a running total of contributions across all accounts is the most straightforward way to stay within the limit and avoid HMRC contact.

Conclusion

The number of ISAs you can hold is entirely dictated by the £20,000 annual allowance. Split it across one account or several, the ceiling does not move. With the cash ISA allowance reducing for under-65s from April 2027, reviewing how to split your allowance across different ISA types is a decision worth making now.

FAQ

Is it a good idea to have multiple ISAs?

Yes. It lets you split your £20,000 allowance across different financial goals—like using a cash ISA for short-term savings and a stocks and shares ISA for long-term growth. Just remember to track your total contributions across all providers so you don’t breach the limit.

Can I open a new ISA every year?

Yes. You can open one or more new ISAs every tax year, including multiple of the same type. Your older ISAs from previous years will remain open and continue growing tax-free, even if you stop paying into them.

Can I transfer an ISA without losing my tax-free status?

Yes, but you must use the official provider-to-provider ISA transfer process. If you manually withdraw the cash and deposit it elsewhere, it counts as a brand-new contribution. Since April 2024, you can also request partial transfers of your current-year contributions.

Can a child have a Junior ISA and a Cash ISA?

Generally, no. The Junior ISA (£9,000 limit) is the standard option for under-18s today. The only exception is for 16- and 17-year-olds who already had an adult cash ISA open before 6 April 2024; they can keep and fund it until April 2026.

 

Disclaimer: This article is for informational purposes only and does not constitute financial advice. Always consult a qualified financial adviser before making savings or investment decisions.