The ISA allowance for the 2023/24 tax year is £20,000. This means you can save £20,000 of new money into your ISA in this tax year. Our Cash ISA maximum balance is £250,000 so you can transfer other ISA balances into your new Shawbrook ISA up to £250,000. If these balances are from previous tax years, they do not count towards the £20,000 limit in the current tax year 2023/24.