It depends. In order to change the order, the court must have included in its order (or the parties in their agreement), a provision stating that the court retains jurisdiction to modify upon a change of circumstances. Sometimes the court orders or the parties only agree that the term of the order can be changed; sometimes the court orders or the parties only agree that the amount can be changed; and sometimes the court orders or the parties agree that both the term and the amount can be changed. “A change in the circumstances” of a party includes, but is not limited to, any increase or involuntary decrease in the party’s wages, salary, bonuses, living expenses, or medical expenses.