Ariz. Rev. Stat. § 43-1089 – Credit for contributions to school tuition organization

A. A credit is allowed against the taxes imposed by this title for the amount of voluntary cash contributions by the taxpayer or on the taxpayer's behalf pursuant to section 43-401, subsection G during the taxable year to a school tuition organization that is certified pursuant to chapter 16 of this title at the time of donation. Except as provided by subsection C of this section, the amount of the credit shall not exceed:
1. 1. Five hundred dollars in any taxable year for a single individual or a head of household.
2. 2. One thousand dollars in any taxable year for a married couple filing a joint return.
B. A husband and wife who file separate returns for a taxable year in which they could have filed a joint return may each claim only one-half of the tax credit that would have been allowed for a joint return.
C. For each taxable year beginning on or after January 1, the department shall adjust the dollar amounts prescribed by subsection A, paragraphs 1 and 2 of this section according to the average annual change in the metropolitan Phoenix consumer price index published by the United States bureau of labor statistics, except that the dollar amounts shall not be revised downward below the amounts allowed in the prior taxable year. The revised dollar amounts shall be raised to the nearest whole dollar.
D. If the allowable tax credit exceeds the taxes otherwise due under this title on the claimant's income, or if there are no taxes due under this title, the taxpayer may carry the amount of the claim not used to offset the taxes under this title forward for not more than five consecutive taxable years' income tax liability.
E. The credit allowed by this section is in lieu of any deduction pursuant to section 170 of the internal revenue code and taken for state tax purposes.
F. The tax credit is not allowed if the taxpayer designates the taxpayer's contribution to the school tuition organization for the direct benefit of any dependent of the taxpayer or if the taxpayer designates a student beneficiary as a condition of the taxpayer's contribution to the school tuition organization. The tax credit is not allowed if the taxpayer, with the intent to benefit the taxpayer's dependent, agrees with one or more other taxpayers to designate each taxpayer's contribution to the school tuition organization for the direct benefit of the other taxpayer's dependent.
G. For the purposes of this section, a contribution, for which a credit is claimed, that is made on or before the fifteenth day of the fourth month following the close of the taxable year may be applied to either the current or preceding taxable year and is considered to have been made on the last day of that taxable year.