Application deadline date is September 1st of the current year. This exemption applies to all homeowners.Q1. NEW CLAIMS: Applicant has submitted copies of the following documents: ⃣. Letter describing specific use(s) and occupancy of the property. This exemption does not apply to municipal (city) taxes. Anyone in here have a property tax exemption with Maricopa county in AZ? Application for Property Tax Exemption. To establish eligibility for property tax exemption, the claimant must sign and file an affidavit with the County.