Child Support payments may be made online. The payment may be made after you register with the State of Arizona Payment Gateway.AZ Child Support Portal. Make child support payments, view your account information, send emails and update your contact information. Complete one of the following application forms: Follow the instructions on the application and provide as much information and as many documents as possible. The courts provide a free calculator that can be used to determine what a divorcing parent's child support obligations might be. You may also fill out this form online at the Family Support Center Website. The Child Support Calculator is an interactive program that will calculate a child support amount based on the Arizona Child Support Guidelines. DISCLAIMER The Child Support Calculator is an interactive program that will calculate a child support amount based on the Arizona Child Support Guidelines. When the paying parent is employed, judges must require that payments be made through a wage assignment.