Wis. Stat. § 755.21

The municipal court may contract with a collection agency for the collection of unpaid forfeitures, assessments, and surcharges under s. 66.0114 (1) (a) . The contract shall provide that the collection agency shall be paid from the proceeds recovered by the collection agency. The net proceeds that the municipal court receives after the payment to the collection agency shall be considered the amount of forfeitures, assessments, and surcharges collected for distribution under s. 66.0114 (1) (bm) and (3) (b) and (c) .