Ariz. Rev. Stat. § 15-992
B. At the same time of levying taxes as provided in subsection A of this section, the county board of supervisors shall annually levy an additional tax in each school district that is not eligible for equalization assistance as provided in section 15-971 in an amount determined as follows:
F. At the same time of levying taxes as provided in subsection A of this section, the county board of supervisors shall annually levy an additional tax in each common school district not within a high school district that is equal to the lesser of:
2. A rate that would result in a levy that equals the statewide average per pupil funding for high school pupils multiplied by the student count as defined in section 15-901 of resident high school pupils in the common school district not within a high school district during the prior school year. On or before July 1 of each year, the department of education shall provide each common school district not within a high school district with the student count as defined in section 15-901 of resident high school pupils in the district during the prior school year. On or before July 1 of each year, the department of education shall provide each county board of supervisors with the statewide average per pupil funding for high school pupils, the student count as defined in section 15-901 of resident high school pupils in the common school district not within a high school district during the prior school year and any other information requested by the county board of supervisors for the purposes of levying the tax prescribed in this subsection. For the purposes of this paragraph, "per pupil funding" means the amount calculated pursuant to section 15-943, paragraph 2, subdivision (a) for grades nine through twelve multiplied by the sum of the following:
G. At the time of levying taxes as provided in subsection E of this section, the county school superintendent shall annually validate any additional primary school district tax levy amount requests from each school district and levy the sum of the following amounts: