In Utah, if it states that he pay in the Divorce Decree/judgment then you can do an Order to Show Cause to show he is not complying with the Divorce Decree and therefore get a judgment against him to enforce such.
Brian Arnold Esq.
Arnold & Wadsworth
If he agreed to it, you should file a motion to enforce that agreement.
Robert Ricci, Jr., Esq.
1743 St. Georges Avenue
Rahway, NJ 07065
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Your former husband is in contempt of court if he has the ability to comply with the judgment. There is no waiting period. However, if the court finds that he does not have the ability to pay when you have a hearing, he may not be in contempt, but the court should at least enter a judgment for the amount or add it to what he owes in child support and maybe order it paid over a period of time.