What is the current ISA allowance?
The overall annual deposit allowance for adult ISAs is £20,000. This is for the 2026/27 tax year which runs from 6 April 2026 to 5 April 2027.
The ISA allowance refers to how much money you can deposit into ISAs in a tax year. You can split the £20,000 allowance across different types of ISAs, like cash ISAs and stocks and shares ISAs.
The allowance for children’s ISAs (Junior ISAs) is currently £9,000 per child.
How ISA allowances work
While there’s a limit on how much you can deposit into ISAs each tax year, there’s no cap on the total value you can accumulate over time. For example, if you pay the maximum of £20,000 into ISAs each tax year for three years, you'll have invested £60,000, which remains, free from UK Income Tax and Capital Gains Tax while you keep the money in ISAs.
Your ISA allowances do not roll over, so if you deposit £10,000 one year, you cannot deposit £30,000 the next year to make up the difference.
Are ISA allowances changing in 2027?
No. On 28 October 2026, the government announced that ISA allowances would not be changing in 2027. Any previous plans to change allowances are now cancelled. The cash ISA allowance for 2027/28 will remain £20,000.
Learn more about ISAs
If you’d like to know more about ISAs, including the different types, please read our 'What is an ISA?' article. NS&I offer a cash ISA with a variable interest rate called a Direct ISA
Saving with NS&I
NS&I is the UK government savings bank. We believe that everyone should be able to save confidently for what matters to them. If you’re ready to start your saving journey, explore our range of products and join the millions of people already saving with us.
