Fill out the Homestead Tax Credit, 54-028 form. Return the form to your city or county assessor.The application filing period is from January 1st through December 31st. 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. Disabled applicants must complete form DTE 105E,. Address: City: State: ZIP: Phone: Answer these questions to determine eligibility: 1. Are you currently an Iowa resident? Iowa law provides for a number of credits and exemptions. Homestead Exemption. Pre-populated Homestead Tax Credit Application Forms are available to be printed from within your parcel on our website.