You can have multiple ISAs providing you do not exceed the annual pay-in limit currently £20,000 for the 2020/21 financial year. This allowance can be split between different types of ISA but you can only pay into one type of ISA each financial year. You can however retain ISAs from previous years.

You may for example, choose to put £4,000 into a Lifetime ISA (the maximum you can save in this type of account) to benefit from the 25% bonus offered by the Government and then split the remaining £16,000 however you choose.