Moneys in the Estate Tax Refund Fund shall be expended exclusively for the purpose of paying refunds resulting from overpayment of tax liability under this Act, except that, whenever the State Treasurer determines that any such moneys in the Fund exceed the amount required for the purpose of paying refunds resulting from overpayment of tax liability under this Act, the State Treasurer may transfer any such excess amounts from the Estate Tax Refund Fund to the General Revenue Fund.
The Treasurer shall order payment of refunds resulting from overpayment of tax liability under this Act from the Estate Tax Refund Fund only to the extent that amounts have been deposited and retained in the Fund.
Public Act 97-732 shall constitute an irrevocable and continuing appropriation from the Estate Tax Refund Fund for the purpose of paying refunds upon the order of the Treasurer in accordance with the provisions of this Act and for the purpose of paying refunds under this Act.
35 ILCS 405/13