Cash ISA rules for 2026/27: allowance, withdrawals and transfers

Cash ISA rules are simple at the headline level but easy to muddle when you mix new contributions, transfers and withdrawals. The 2026/27 tax year still uses the existing £20,000 overall ISA allowance.

The 2026/27 ISA allowance remains £20,000

For the tax year running from 6 April 2026 to 5 April 2027, the overall Individual Savings Account subscription limit is £20,000. Cash ISAs are one of the available ISA types. Interest earned inside a cash ISA is not subject to UK Income Tax, and you do not include ISA interest on a tax return. The allowance applies to money subscribed during the tax year, not to the total historical value of ISAs you built up in earlier years.

You can divide the annual allowance across eligible ISA types rather than placing the full amount in cash. The exact mix is a personal choice based on risk, time horizon and access needs. A cash ISA protects the tax treatment of interest, but it is still worth comparing the actual interest rate with ordinary savings accounts because tax-free does not automatically mean highest net return for every saver.

Withdrawals depend on whether the ISA is flexible

GOV.UK distinguishes flexible and non-flexible ISAs. If a cash ISA is flexible, money withdrawn can normally be replaced within the same tax year without reducing the remaining current-year allowance. With a non-flexible ISA, withdrawing money does not automatically restore that subscription room. The provider’s terms decide whether the account has flexibility and may impose notice periods or withdrawal penalties on particular products.

For example, somebody who has subscribed £10,000 in the year and withdraws £3,000 could have different remaining contribution room depending on flexibility. That is why the word “easy access” and the word “flexible” should not be treated as interchangeable. One describes access to the product; the other has a specific ISA allowance consequence.

Use the ISA transfer process instead of withdrawing cash yourself

If you want to move an existing ISA to another provider, use the receiving provider’s ISA transfer process. Withdrawing the money into your current account and then paying it into a new ISA can turn an ISA transfer into a new subscription and may use allowance unnecessarily. Transfer rules can also differ depending on the type of ISA and whether the money is from the current tax year or previous years.

Before transferring a fixed-rate cash ISA, check for an interest penalty or notice requirement. A higher advertised rate elsewhere can be outweighed by an exit charge. Keep the transfer confirmation until the old provider has closed or reduced the account correctly and the new provider shows the transferred funds as ISA money.

What changes from April 2027?

The government has announced reforms due from 6 April 2027. Under the planned rules, the annual Cash ISA subscription limit for people under 65 will be £12,000 within the unchanged £20,000 overall ISA limit, while those aged 65 and over will retain a £20,000 Cash ISA limit. These are future rules and do not reduce the 2026/27 Cash ISA capacity described in this article.

Because tax policy can change between announcement and implementation, anyone planning contributions close to April 2027 should check the final GOV.UK rules at that time. For 2026/27, keep the calculation straightforward: track what you subscribe during the current tax year, use official transfers for existing ISA money and confirm whether your chosen account is flexible before replacing withdrawals.

Transfers, flexible withdrawals and the mistakes that can waste ISA allowance

Moving an ISA is not the same as withdrawing the money and paying it into a new account yourself. If you want to preserve the ISA tax wrapper, use the receiving provider’s formal ISA transfer process. Taking the cash out personally can turn the movement into a new subscription and may use allowance unnecessarily. The exact transfer options depend on the type of ISA, the provider and whether you are transferring current-year or previous-year subscriptions, so read the receiving account’s transfer terms before moving money.

Flexible ISAs add another layer. Where an ISA is explicitly flexible, certain withdrawals can be replaced within the permitted rules without using additional annual allowance, usually within the same tax year and with conditions set by the legislation and product. Not every Cash ISA is flexible. The word “easy access” describes withdrawal access; it does not by itself mean the ISA is flexible for allowance purposes.

For 2026/27 the overall ISA subscription limit remains £20,000. Policy changes announced for later tax years should not be applied early when planning this year’s contributions. Keep a simple record of subscriptions across providers, especially if you use more than one ISA type. Providers can tell you what you paid into their product, but they do not necessarily know every subscription you made elsewhere.

Sources and verification

• GOV.UK — Individual Savings Accounts
• GOV.UK — Withdrawing your money from an ISA
• GOV.UK — ISA reform 2027 factsheet

MyBankAnswers uses official provider and UK regulatory sources wherever practical. Information is general and does not constitute financial advice.