(a) The comptroller by interagency contract shall charge and collect fees from each state agency to which this subchapter applies for the comptroller's services under this subchapter.
(b) The total amount charged a state agency under this section may not exceed the amount of the agency's appropriated funds for outgoing first-class mail, as determined by the Legislative Budget Board, minus the agency's fixed costs for these services.
(c) The comptroller shall transfer to the general revenue fund the amount of a fee charged a state agency under this section that is greater than the amount of the comptroller's actual expenses for performing the services for the agency.