You pay no property tax at all on your home if the VA compensates you at the 100 percent total and permanent service-connected disability rating or at the individual unemployability rate. Property tax in Texas is assessed and administered locally, so the county appraisal district where your home sits grants the exemption. If you qualify for more than one veteran property tax exemption you can only take one, so take the largest you qualify for.
File the Texas Residence Homestead Exemption Application, Comptroller Form 50-114, with the county appraisal district where your home is located, not with the state. Ask the county appraisal district, tax assessor or collector for their filing dates.
Your VA award letter showing a 100 percent total and permanent service-connected rating or individual unemployability, proof that you own the home, and proof that it is your principal residence.