Ariz. Rev. Stat. § 31-254
D. If the compensation due a prisoner is less than two dollars per hour, mandatory deductions shall be taken for the following purposes in the order specified:
E. If the compensation due a prisoner equals or exceeds two dollars per hour, the director shall credit to the prisoner's spendable account established pursuant to section 31-230 an amount equaling fifty cents per hour for each hour compensation is due plus ten percent of the adjusted balance remaining after the mandatory deductions are taken. Mandatory deductions shall be taken for the following purposes in the order specified: