A sum to be determined by the Director of Finance, of amounts deposited in the disability fund, may be used for the necessary expenses of administration of this part and Sections 17061 and 17061.5 of the Revenue and Taxation Code in addition to any other fund or money available for such purpose. Such sum shall be available to the department for the payment of the expenses of administration of this part and Sections 17061 and 17061.5 of the Revenue and Taxation Code by the department and the Franchise Tax Board only to the extent that money received from the United States or any of its agencies is not available for such purposes.