2.1.4 Withdrawing an application
If the Registrar has not made a decision either to accept or to refuse an application for a child support assessment, the applicant can withdraw their application.
CSA Act section 32
The person who made an application for a child support assessment can withdraw it if the Registrar has not made a decision on the application, either to accept it or to refuse to accept it (section 32).
If a person withdraws their application, it is as if the application had not been made (section 32(4)).