Application deadline date is September 1st of the current year. How do you apply for Arizona Senior Homeowners Tax Relief?The application deadline for filing is September 1. Application for Property Tax Exemption. To establish eligibility for property tax exemption, the claimant must sign and file an affidavit with the County. If Qualified, How Does One Benefit? The property owner must be 65 or older. Explore the Arizona Homestead Act with Gottlieb Law: Key protections, eligibility, and how it affects divorce and bankruptcy. The affidavit and eligibility form necessary to file an application for exemption can be obtained from the assessor. If you're over age 65 in Arizona and are on a fixed income, you may be eligible to significantly reduce your property tax bill.