Exemptions are only available to permanent. To receive the 100 percent disabled veteran exemption, you may file for the exemption up to five years after the delinquency date for the taxes on the property.Complete the form online and select the state's e-file option. Next, follow the instructions on each section of the form carefully. Submit all applications and documentation to the property appraiser in the county where the property is located. This video covers how to fill out Texas Residential Homestead Exemption with a focus on Bexar County. The veteran's surviving spouse is eligible for the same exemption provided he or she remains unmarried and remains in the home.