To apply for a Homestead Exemption, you must submit the following to the Harris Central Appraisal District (HCAD):. The general deadline for filing an exemption application is before May 1.To apply for a Homestead Exemption online, you need to provide electronic copies of the documents listed below. See below for details regarding each exemption and to check your eligibility. Appraises property for ad valorem taxation of these taxing authorities. The residential homestead exemption application is located on our website tadd. Org under forms then homestead exemption. Please contact the Assessor's Office at 504-362-4100 to file for a homestead exemption. Homeowners in Louisiana are eligible for the homestead exemption, which can significantly reduce property taxes owed. The Harris County Appraisal District is mailing out postcards to homeowners with a homestead exemption on file.