You must file an Application for Residential Homestead Exemption with the
county appraisal district between January 1 and April 30 of the tax year -- up
to one year after you pay your taxes. During the year, if you turn 65 or become
disabled, you must apply for the 65 or older or disabled exemption no later
than one year from the qualification date. Once you receive the exemption, you
do not need to reapply unless the chief appraiser sends you a new application.
In that case, you must file the new application.