Ariz. Rev. Stat. § 43-1147
A. Except as provided by subsection B of this section, sales, other than sales of tangible personal property, are in this state if either of the following applies:
B. For taxable years beginning from and after December 31, 2013, a multistate service provider may elect to treat sales from services as being in this state based on a combination of income-producing activity sales and market sales. If the election under this subsection is made pursuant to subsection C of this section, the sales of services that are in this state shall be determined for taxable years beginning from and after:
1. December 31, 2013 through December 31, 2014, by the sum of the following:
2. December 31, 2014 through December 31, 2015, by the sum of the following:
3. December 31, 2015 through December 31, 2016, by the sum of the following:
C. A multistate service provider may elect to treat sales from services as being in this state under subsection B of this section as follows:
1. The election must be made on the taxpayer's timely filed original income tax return. The election is:
2. During the election period, the election may be terminated as follows:
E. For the purposes of this section:
3. "Multistate service provider" means any of the following: