This Certificate is prescribed by the Department of Revenue pursuant to A.R.S. § 42-5009. The purpose of the Certificate is to document and establish a basis for state and city tax deductions or exemptions. It is to be filled out completely by the purchaser and furnished to the vendor at the time of the sale. The vendor shall retain this Certificate for single transactions or for the specified period as indicated below. Incomplete Certificates are not considered to be accepted in good faith. Only one category of exemption may be claimed on a Certificate.