New homeowners must submit a residential property declaration to the county assessor within 90 days of receipt of the form. Here are the details: How to file for a Primary Residence Exemption: Step 1.Download and fill out a Primary Residence Application (PDF) Applications should be submitted to the Auditor's office through the Tax Exemptions Portal. Typically, you'll need to fill out a homestead exemption application with your county tax office. Is your mailing address different from your physical address? If so, UAC 59-2-103.5 (8) requires you to fill out a Residential Property Declaration.