(a) Subject to the availability of funds, the Department of Family and Protective Services shall pay, in addition to any other amounts due, a monetary incentive to a licensed child-placing agency for the completion of an adoption:
(1) of a child, as defined by Section 162.301, receiving or entitled to receive foster care at department expense; and
(2) arranged with the assistance of the agency.
(b) The incentive may not exceed 25 percent of the amount the department would have spent to provide one year of foster care for the child, determined according to the child's level of care at the time the adoption is completed.
(c) For purposes of this section, an adoption is completed on the date on which the court issues the adoption order.