Tennessee Code Title 67. Taxes and Licenses § 67-3-1309

(a) A farmer whose use of diesel fuel is predominately for agricultural purposes and non-highway use, and who owns or operates one (1) or more passenger cars or trucks in the weight class shown in this section, may apply for a diesel tax prepaid user authorization. Such authorization requires the holder to prepay an annual tax on the diesel fuel purchased from a wholesaler for the holder's own consumption. Prepayment of tax is at the rate prescribed for each motor vehicle based on the class of registered gross weight. The tax paid pursuant to a prepaid user authorization shall be paid on a calendar year basis. A farmer whose purchases of diesel fuel are predominately for non-agricultural purposes or highway use does not qualify for a diesel tax prepaid user authorization.

(b) Whenever the holder of a diesel tax prepaid user authorization ceases to farm within this state, the authorization is void, and the prepaid user shall notify the commissioner in writing within fifteen (15) days after discontinuance. The commissioner shall refund such portion of the prepaid tax attributable to the remaining portion of the calendar year.