To elect an Arizona withholding percentage, an employee must complete Arizona Form A-4, and submit it to their employer. AZ Child Support Portal.Make child support payments, view your account information, send emails and update your contact information. Find out how to establish a child support order or medical support. Forms and information for filing for child support or requesting child support direct deposits in Arizona. The Child Support Calculator is an interactive program that will calculate a child support amount based on the Arizona Child Support Guidelines. DISCLAIMER