Your current Ag/Timber number expires on Dec. 31, 2019. You must renew your number in order to continue to claim an exemption on your qualifying agricultural and timber purchases made after that date. The Comptroller’s office has mailed renewal information to affected taxpayers. Renewals can be completed over the phone by calling 844-AGRENEW (844-247-3639) or online thru the Ag/Timber Registrations/Renewals eSystem using your WebFile number, which is included in your renewal letter. Cited from and for more information click on the link below. https://comptroller.texas.gov/taxes/ag-timber/   mailto:greg.baker@ag.tamu.edu