You must apply to HCAD for any exemptions for which you qualify. Most of these exemptions have specific application forms that can be found through the exemption forms link in the resource list above. Resources.Model forms, exemption applications, and special-use applications are made available here as a public courtesy. How to Complete the Application. Fill out the other side of this application completely. The exemptions are not automatically applied. All eligible facilities must submit Form 50-844, the application.