File this form and all supporting documentation with the appraisal district office in each county in which the property is located generally between Jan. This video covers how to fill out Texas Residential Homestead Exemption with a focus on Bexar County.Most counties have the homestead exemption form online. Applying for the homestead exemption is FREE and easy. 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. The regular filing deadline is February 15th to receive the full exemption. Bought a primary residence within the past year in Texas? It's time to file for your Texas Homestead Exemption. How do I apply for a homestead exemption? To qualify for the homeowners' exemption, the home must have been the principal residence of the owner as of January 1 of that tax year.