Arizona Arbitrage Calculation Request is a form used to request a calculation of past-due child support payments owed to a custodial parent by a non-custodial parent. The form is used to determine the total amount of unpaid child support payments, also known as arbitrage, that is owed by the non-custodial parent. There are two types of Arizona Arbitrage Calculation Request forms: one for a lump sum arbitrage calculation, and one for a monthly arbitrage calculation. The lump sum form is used to obtain the total amount of money owed in a single payment. The monthly form is used to determine the amount of money owed each month for a specified period of time. Both forms require the custodial parent to provide detailed information about the non-custodial parent, including name, address, and Social Security number, as well as information about the child, including name, date of birth, and other relevant information.