Property tax in Texas is a locally assessed and locally administered tax. There is no state property tax. Property tax brings in the most money of all taxes available to local government to pay for schools, roads, police and firemen, emergency response services, libraries, parks and other services provided by local government.

Texas offers a variety of partial or total (absolute) exemptions from appraised property values used to determine local property taxes. A partial exemption removes a percentage or a fixed dollar amount of a property’s value from taxation. A total (absolute) exemption excludes the entire property from taxation. Taxing units are mandated by the state to offer certain (mandatory) exemptions and have the option to decide locally on whether or not to offer others (local option).

Read More at http://comptroller.texas.gov/taxinfo/proptax/exemptions.html