The last day to file your rendition is between January 1 - April 15th annually Per Texas Property Tax Code 22.23(a).
The online or email versions must be submitted by April 15th, or if you mail your rendition, it must be postmarked by the U.S. Postal Service on or before April 15th.
There is a late filing provision available IF requested in writing by April 15th , with WCAD office. If approved, the deadline will be May 15th, Per Texas Property Tax Code 22.23(b).