For 2020/21 the ISA allowance limit is £20,000 for each financial year. The total can be divided between cash and stocks and shares. Any unused allowance will not roll over to the next year, so it’s worth making the most of it, if you can afford to. It’s your choice if you want to set aside a regular amount or deposit a lump sum. There are limits on other types of ISA such as a Lifetime ISA, which has an annual limit of £4,000. A Junior ISA has an annual limit of £9,000 until the child turns 18 years of age.