The directors of any domestic insurer are authorized to pay, and to appropriate money to pay, such taxes, charges and fees as have been or may be imposed against the property, business, income or franchises of such insurer by the laws of this or any other State or jurisdiction in which such insurer is doing business unless, prior to the payment of any such tax, charge or other fee, the law imposing the same shall have been expressly held invalid by the State court having final appellate jurisdiction in the premises or by the Supreme Court of the United States.
N.J.S. § 17B:18-50