File this form and all supporting documentation with the appraisal district office in each county in which the property is located generally between Jan. Org online forms, or comptroller.texas.Use WCAD's online exemption form for quicker filing and expedited processing time. It's just five pages it's really pretty simple to fill it out it doesn't cost you anything you can only do it from January 1st through April 30th. An application must be completed and filed in the Property Valuation Office along with documentation verifying age. (NOTE: Exemptions are not auto-populated and are reset upon search.) HOMESTEAD. The county is providing this table of property tax rate information as a service to the residents of the county. If you bought a home last year don't forget to fill out your homestead exemption to lower your annual property taxes. There is a Texas property tax exemption for people over the age of 65, which offers temporary tax relief for seniors. Many counties remove an acre for buildings or a homestead.