If the account holder passes away before the end of the fixed rate term, it will no longer qualify as an Isa from the date of the death. Beneficiaries will only be able to access funds once the executor closes the account, or once the administration of the estate has been completed. An Isa will form part of your estate for the purposes of inheritance tax. If you have a spouse or civil partner, they can inherit your fixed rate Isa and keep the tax benefits. Your Isa will only remain open until three years and one day after your death.