Fill out the Homestead Tax Credit, 54-028 form. Return the form to your city or county assessor.Information regarding the homestead tax exemption including age requirements and filing details. New applications for homestead tax credit are to be filed with the Assessor on or before July 1 of the year the credit is first claimed. File the completed form with the Polk County Treasurer between January 1 and June 1. New applications for homestead tax credit and exemption are to be filed with the Assessor on or before July 1 of the year the credit is first claimed. Homeowners should sign up in person at the Scott County Assessor's Office to show ID when filling out a new homestead application. The Homestead Credit is available to all homeowners who own and occupy the residence. Iowa Property Tax Credit Claim 54-001. This exemption can be applied to all residential property up to five dwelling units of which at least one is owner occupied.