(a) Commencement; service; answer.Except as provided in Utah Code Section 30-3-37, proceedings to modify a divorce decree or other final domestic relations order must be commenced by filing a petition to modify. Service of the petition, or motion under Section 30-3-37, and summons upon the other party must be in accordance with Rule 4. The responding party must serve the answer within the time permitted by Rule 12.

(b) Temporary orders.

(1) The judgment, order or decree sought to be modified remains in effect during the pendency of the petition. The court may make the modification retroactive to the date on which the petition was served. During the pendency of a petition to modify, the court:

(A) may order a temporary modification of child support as part of a temporary modification of custody or parent-time; and

(B) may order a temporary modification of custody or parent-time to address an immediate and irreparable harm or to ratify changes made by the parties, provided that the modification serves the best interests of the child.

(2) Nothing in this rule limits the court’s authority to enter temporary orders under Utah Code Section 30-3-3.