Williamson County Tax Assessor/Collector will not accept prepayments for 2018 property taxes. Recent information from the IRS indicates that prepayments held in escrow are not deductible. Further information is available at https://www.irs.gov/newsroom/irs-advisory-prepaid-real-property-taxes-may-be-deductible-in-2017-if-assessed-and-paid-in-2017.