Learn how to apply for child support services and find procedures for establishing parentage and custody, as well as payment and enforcement. Complete the income withholding documents.Complete Form W-4MN so your employer can withhold the correct Minnesota income tax from your pay. Withholding must begin no later than the first pay period that occurs after 14 days following the date of receipt of the order for or notice of withholding. Enter "MN" in the "State" space and fill in the amount of Minnesota income tax withheld for that recipient during the year, if any.