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What happens to any regular contributions when a Junior ISA matures?

Once a Junior ISA matures into an adult ISA we will stop collecting any regular savings payments that were going into the Junior ISA. Only the account holder will be able to pay into the new adult ISA.

Any contributions paid into a Junior ISA in the tax year when the account matures do not count towards the holder's adult ISA allowance for that year. For example, if a child turns 18 in January 2020 and their parents have paid the full £4,368 into their Junior ISA for the 2019/20 tax year, they still have the option of paying £20,000 into an ISA in the three months before the end of the tax year.