The department shall provide child support incentive payments to counties from one of the following appropriations:
(a)#
Unless par. (b) applies, from the appropriation under s. 20.437 (2) (bc).
(b)#
If federal legislation provides for the matching of federal funds for federal child support incentive payments at a rate of 66 percent or more, from the appropriation under s. 20.437 (2) (k) while the federal legislation is in effect. Total payments under this paragraph may not exceed $5,690,000 per year.