Register a Foreign (Out of State) Family Support Order. You may use the forms on this page if the following factors apply to your situation.You can apply for child support services using our online application. Although Maricopa County did employ this method in the past, the court ultimately concluded that it was no longer appropriate. Learn how Arizona's child support guidelines work, including how to calculate support, collect support payments, and change your existing support order. You can choose to make your payment in whatever way is most convenient for you. Find the best family attorney serving Maricopa County. This Child Support Guidelines Calculator is for informational purposes only and is not a guarantee of the amount of child support that will be ordered. We have been effective in all manner of family law from child custody and support cases to alimony and modifications of prior agreements. The amount of child support you pay or receive for children of your relationship.