Under state law, agricultural and timber producers can claim sales tax exemptions for some items they use to produce products for sale. The office of State Comptroller Glen Hegar issues registration numbers for these exemptions. If you’re in farming, ranching or timber, it’s time to renew your registration. All ag/timber registration numbers are expiring on Dec. 31, 2015, regardless of when they were issued. If you claim this important exemption, and you haven’t already renewed your registration, you need to do so now if you want to keep it. To continue claiming the exemption, you can renew by phone, online or by mail. You can get detailed information on renewals online at comptroller.texas.gov or by calling toll-free 1-844-AG RENEW (1-844-247-3639).