ISAs explained: a simple guide for the 2026/27 tax year

An ISA is a way of holding savings or investments with UK tax advantages. It is not a guarantee of a good interest rate or a profitable investment. Start by deciding what the money is for, then look at the account.

The allowance for 2026/27

GOV.UK states that the overall adult ISA subscription limit is £20,000 for the 2026/27 tax year. The allowance can be spread across accounts, subject to the rules for each ISA type. Eligibility matters: do not assume that being paid in pounds makes you eligible. Check the current residence and age requirements before applying.

Cash or stocks and shares?

A cash ISA holds cash savings. A stocks and shares ISA holds investments whose value can fall. The tax wrapper does not remove investment risk. Access terms also matter: a fixed-term cash account may charge for early withdrawal, so read the provider's terms.

Imagine you have £3,000 for a move next spring and separate money for a much later goal. Those pots have different jobs. Choosing an account simply because its headline rate looks attractive could leave the moving money difficult to access.

Before opening an account

• Write down when you expect to need the money.
• Compare the rate alongside access restrictions, charges and any introductory period.
• Check your total ISA contributions for the tax year.
• If moving an existing ISA, check the official transfer process before withdrawing it yourself.

Source checked: 8 October 2026. Read GOV.UK's ISA overview and how ISAs work. Rules can change between tax years.

Next: understand savings protection, or explore a savings goal in pounds.

General education, not personalised tax or investment advice.