Tenn. Code Ann. § 40-3-206

Any fees collected pursuant to this part shall be collected by the clerk of the court in the same manner in which other costs are collected. The clerk shall be entitled to a reasonable handling fee not to exceed five percent (5%) of the amount collected; provided, that in counties having a population of more than seven hundred thousand (700,000), according to the 1990 federal census or any subsequent federal census, the fee shall not exceed ten percent (10%) of the amount collected.