Tenn. Code § 56-4-206
Every insurance company writing workers' compensation insurance under the Workers' Compensation Law, compiled in title 50, chapter 6, shall be subject to and pay a tax of four percent (4%) on gross premiums collected for workers' compensation insurance, plus a surcharge of four tenths of one percent (0.4%) on gross premiums, the surcharge to be earmarked for the administration of the Tennessee Occupational Safety and Health Act, compiled in title 50, chapter 3. This tax shall be paid at the same time and in the same manner as the tax levied upon insurance companies by § 56-4-205; provided, that the surcharge of four tenths of one percent (0.4%) on the tax on workers' compensation insurance premiums levied by this section does not apply to any employer who employs ten (10) or fewer employees, unless the employer is in the business of construction or manufacturing.
T.C.A. § 56-4-206