The court may make a financial order designated “family support” as a substitute for child support orders under s. 767.511 and maintenance payment orders under s. 767.56 . Subject to s. 767.511(6m) , a party ordered to pay family support under this section shall pay simple interest at the rate of 1 percent per month on any amount in arrears that is equal to or greater than the amount of child support due in one month. Subject to s. 767.511(6m) , if the party no longer has a current obligation to pay child support, interest at the rate of 1 percent per month shall accrue on the total amount of child support in arrears, if any. Interest under this section is in lieu of interest computed under s. 807.01(4) , 814.04(4) , or 815.05(8) and is paid to the department or its designee under s. 767.57 . Except as provided in s. 767.57(1m) , the department or its designee shall apply all payments received for family support as follows:
Wis. Stat. ยง 767.531