How is my property value determined? What are some exemptions?This video covers how to fill out Texas Residential Homestead Exemption with a focus on Bexar County. Complete list of Texas Comptroller Property Tax Forms and Applications click here. Texas Comptroller Property Tax Publications click here. 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. Created for homeowners and those looking to become homeowners, the ExpressNews explains the Bexar County property tax system. Use SmartAsset's free Texas mortgage loan calculator to determine your monthly payments, including PMI, homeowners insurance, taxes, interest and more. View information about property taxes and exemptions.