Williamson County Property Tax Protest Guide
In Williamson County, file your protest by May 15, 2026 at Williamson Central Appraisal District's online portal.
| Deadline | May 15, OR the 30th day after the appraisal district delivers the notice of appraised value, whichever is later. |
|---|---|
| Lien date | January 1, 2026 |
| Protest body | Appraisal Review Board (ARB) |
| Assessor / district | Williamson Central Appraisal District |
| Online portal | File online |
How to File a Protest in Williamson County
- Gather your assessment notice — it lists your account number and any access code
- File online through Williamson Central Appraisal District's portal or by mail
- State your grounds and submit evidence (comparable sales, a licensed appraisal, or photos of defects)
- Request an informal review to try to settle before a formal ARB hearing
- County note: Online Passcode from notice; virtual hearings