(a)#
If a person liable under sub. (2) fails to make payment or enter into or comply with an agreement for payment, the department may bring an action to enforce the liability or may issue an order to compel payment of the liability. Any person aggrieved by an order issued by the department under this paragraph may appeal the order as a contested case under ch. 227 by filing with the department a request for a hearing within 30 days after the date of the order.
(b)#
If judgment is rendered in an action brought under par. (a) for any balance that is 90 or more days past due, interest at the rate of 12 percent per year shall be computed by the clerk and added to the liable person’s costs. That interest shall begin on the date on which payment was due and shall end on the day before the date of any interest that is computed under s. 814.04 (4).
(c)#
If the department issues an order to compel payment under par. (a), interest at the rate of 12 percent per year shall be computed by the department and added at the time of payment to the person’s liability. That interest shall begin on the date on which payment was due and shall end on the day before the date of final payment.