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Passing on your ISA allowance after death
You can choose to pass on your ISA allowance to your husband, wife or civil partner when you die. This gives them a one-off tax-free allowance of the whole value of the savings and investments in your ISA, which is added to their own ISA allowance. You can’t pass it on to anyone else.
This only applies to anyone in a marriage or civil partnership who has died since 3 December 2014. The surviving spouse will only get the increased ISA allowance from the start of the following tax year.
If you want your partner to inherit your tax-free ISA allowance, you need to make sure your Will leaves your ISA to them.