Wis. Stat. § 48.37: Costs and fees.

(1) A court assigned to exercise jurisdiction under this chapter and ch. 938 may not impose costs, fees, or surcharges under ch. 814 against a child under 14 years of age but may impose costs, fees, and surcharges under ch. 814 against a child 14 years of age or older.

(2) Notwithstanding sub. (1), no costs, fees, or surcharges may be imposed under ch. 814 against any child in a circuit court exercising jurisdiction under s. 48.16.