A.R.S. § 43-434

In the case of nonresident employees who are residents of another state and are allowed a tax credit for income taxes paid to their state of residency or domicile under the provisions of section 43-1096, sufficient in amount to offset the tax required by this chapter to be withheld from the wages of an employee, the department may by rules and regulations relieve the employers of such employees from withholding requirements of this chapter with respect to such employees.