Wis. Stat. § 66.0518: Defined benefit pension plans.

A local governmental unit, as defined in s. 66.0131 (1) (a), may not establish a defined benefit pension plan for its employees unless the plan requires the employees to pay half of all actuarially required contributions for funding benefits under the plan and prohibits the local governmental unit from paying on behalf of an employee any of the employee’s share of the actuarially required contributions.