what is williamson county tn sales tax
TN Auto Sales Tax Calculator. The following information is for Williamson County, TN, USA with a county sales tax rate of 2.25%. Other counties in TN may have a higher or lower county tax rate (applied to the first $1600). See the State tax list PDF for rates in your city/county. Note: the highest the combined city/county rate can be is 2.75%, so your sales tax will be at most 0.50% higher than the calculation on this page.