Ariz. Rev. Stat. § 15-185
B. Financial provisions for a charter school that is sponsored by the state board of education, the state board for charter schools, a university, a community college district or a group of community college districts are as follows:
1. The charter school shall calculate a base support level as prescribed in section 15-943, except that:
(b) The small school weights prescribed in section 15-943, paragraph 1 apply if a charter holder holds one charter for one or more school sites and the average daily membership for the school sites are combined for the calculation of the small school weight. The small school weight shall not be applied individually to a charter holder if one or more of the following conditions exist and the combined average daily membership derived from the following conditions is greater than six hundred:
D. Charter schools are allowed to accept grants and gifts to supplement their state funding, but it is not the intent of the charter school law to require taxpayers to pay twice to educate the same pupils. The base support level for a charter school or for a school district sponsoring a charter school shall be reduced by an amount equal to the total amount of monies received by a charter school from a federal or state agency if the federal or state monies are intended for the basic maintenance and operations of the school. The superintendent of public instruction shall estimate the amount of the reduction for the budget year and shall revise the reduction to reflect the actual amount before May 15 of the current year. If the reduction results in a negative amount, the negative amount shall be used in computing all budget limits and equalization assistance, except that: