Tennessee Code Title 9. Public Finances § 9-3-210

(a) For the purpose of contributing to the expenses and compensation of the auditors, each county shall pay into the office of the comptroller of the treasury, on or before June 30 of each year, the same to be paid into the state treasury by the comptroller of the treasury, an amount to be determined on the basis of thirty-six cents (36¢) for each person in the county as shown by the population of the county under the last or any future federal census.

(b) Beginning July 1, 2017, and using that year as a base, the foregoing thirty-six cents (36¢) shall be annually increased by three percent (3%), with fractional changes rounded to the nearest one cent (1¢). However, the comptroller of the treasury may, at the comptroller's discretion, reduce the amount required to be paid under this section when the work performed justifies the reduction.