Oregon Revised Statutes Procedure in Civil Proceedings § 25.015

(1) The Department of Justice shall notify the parties to a support order that payment is to commence on the first due date following the date of the notice when:

(2) The department shall include in the notice under subsection (1) of this section a statement that the department will adjust the account to reflect an accrued arrearage for the period of time between the effective date of the order and the date of the notice unless, within 30 days after the date of the notice, a party requests that the department establish the arrearage on the account as provided in ORS 25.167 or 416.429.

(3) If, within 30 days after the date of the notice under subsection (1) of this section, a party requests the department to establish the arrearage as provided in ORS 25.167 or 416.429, the department may not reflect an accrued arrearage on the account until the arrearage has been established.

(4) If a party does not request the department to establish the arrearage as provided in subsection (3) of this section, the department shall adjust the account to reflect the arrearage for the period of time between the effective date of the order and the date of the notice.