Tax relief is a Tennessee state law that provides for property tax relief for low-income elderly (must be 65 by 12/31 of the current year) and disabled homeowners, as well as disabled veteran homeowners or their surviving spouse. This is a state program that is funded by appropriations authorized by the General Assembly.
https://comptroller.tn.gov/office-functions/pa/property-taxes/property-tax-programs/tax-relief.html
Applications must be completed annually and submitted by the collecting agency.