(1) After service of a notice of retained support under WAC 388-14A-5510, if the person, firm, corporation, association, or political subdivision or any officer or agent thereof fails to answer in a timely manner, the claim of the department is final and subject to collection action as a support debt according to chapter 74.20A RCW.

(2) To be timely, a hearing request or response must be received by the division of child support within twenty days of service of the notice.