Fill out the Homestead Tax Credit, 54-028 form. Return the form to your city or county assessor.Eligible claimants who are 65 years of age or older on or before January 1 of the assessment year are now eligible for a homestead tax exemption. Address: City: State: ZIP: Phone: Answer these questions to determine eligibility: 1. Are you currently an Iowa resident? The Iowa Department of Revenue has amended the Homestead Tax Credit and Exemption form (54-028) to allow claimants to apply for the new exemption. Iowa law provides for a number of credits and exemptions. Application deadline date is September 1st of the current year.