Renewal only rolls around once every four years, so the Texas A&M AgriLife Extension Service is reminding all agriculture producers that the Agricultural and Timber Exemption numbers they currently hold will expire on Dec. 31.The Texas Comptroller’s Office states: You must renew your number to continue to claim an exemption on qualifying agriculture and timber purchases made after that date. The Comptroller’s Office mailed out renewal letters in August, but if the renewal hasn’t been completed, the time is short.“This is one of those housekeeping items that is easy to overlook,” said Tiffany Lashmet, J.D., AgriLife Extension agriculture law specialist,