In order to be timely, payment of taxes must be postmarked on or before January 31st. Your deadline for filing an exemption or protest will not be extended while awaiting your PIN.Application Deadlines. Residence Homestead Exemption Applications must be postmarked between January 1 and April 30 of the tax year. New city and county policies could bring homeowners' property tax bills down this fall. Applications to qualify remain open until July 25. Though April 30th is the deadline, the sooner you apply, the better. You can apply for a homestead exemption at any time. Or disabled, may be filed up to two years after the deadline for filing has passed. Bexar County Appraisal District representatives will also be present and answer your individual questions and help you complete your exemption form.