42-5012. Sales between affiliated persons In determining value as applied to sales from one to another of affiliated corporations or persons, or other circumstances where the relation between the buyer and seller is such that the gross proceeds from the sale are not indicative of the true value of the subject matter of the sale, the department shall prescribe uniform and equitable rules for determining the value upon which the tax shall be levied, corresponding as nearly as possible to the gross proceeds from the sale of similar products of like quality or character by other taxpayers where no common interest exists between the buyer and seller, but otherwise under similar circumstances and conditions.
Arizona Legal Code