The Franchise Tax Board shall notify the Controller of both the amount of money paid by taxpayers in excess of their tax liability and the amount of refund money that taxpayers have designated pursuant to Section 18701 to be transferred to the State Children’s Trust Fund, as established by Section 18969 of the Welfare and Institutions Code. The Controller shall transfer from the Personal Income Tax Fund to the State Children’s Trust Fund an amount not in excess of the sum of the amounts designated by individuals pursuant to Section 18701 for payment into that fund.