Williamson County, Texas
Filing deadline: May 15 (earliest possible)
The deadline to file a protest is May 15, or 30 days after the Notice of Appraised Value (NOAV) is mailed, whichever is later; if the deadline falls on a weekend or legal holiday it moves to the next business day.
What to file
protest
Approximate effective tax rate
1.61% (published estimate, 2026)
Look up your current assessed value on the county assessor's site →