Williamson County property taxEstimate your bill and protest your appraisal.
Your bill starts from the value Williamson County’s appraisal district puts on your home. Below are the 2025 rates for every unit that taxes Williamson County homes, a worked example, and the 2027 protest dates. Then put in your own numbers.
Opens the calculator set to Williamson County.
- Rates
- 2025
- School districts
- 16
- Cities
- 17
- Special districts
- 101
- Protest deadline
- May 17, 2027
2025 tax rates, Williamson County
Per $100 of taxable valuePart 1 Units that tax every home in the county
- 01Williamson County$0.413776
Part 2 The largest school district
- 02Round Rock ISD$0.8931
The district that covers the most taxable value in Williamson County. 15 other districts tax part of the county; they're listed below.
Part 3 Example: a $300,000 homestead in Round Rock ISD, outside city limits
| Unit | Taxable | Tax |
|---|---|---|
| Williamson County | $300,000 | $1,241 |
| Round Rock ISD | $160,000 | $1,429 |
Estimated yearly tax
$2,670
Each $10,000 cut from this appraisal saves about $131 a year.
An example value, not a typical Williamson County home. The school line subtracts the $140,000 state homestead exemption. It leaves out city and special district taxes and any local-option exemptions the county or school district offers, so your bill can differ.
Estimate My TaxSource Texas Comptroller of Public Accounts, Tax Rates and Levies (https://comptroller.texas.gov/taxes/property-tax/rates/). Adopted 2025 rates.
Checking Williamson County…
Tax Code 41.44
Protesting in Williamson County.
State law sets the protest rules, so they’re the same in Williamson County as in every Texas county. You file with the appraisal district, not the county.
- 01Apr 2027
Your notice arrives
It lists a market value and an appraised value. You’re taxed on the appraised value, less your exemptions.
- 02May 17, 2027
Protest deadline
File Form 50-132, the Notice of Protest, by May 15 or within 30 days after your notice was delivered, whichever is later. May 15 is a Saturday in 2027, so the deadline moves to Monday, May 17. Many districts take protests online.
- 03May to Jul
Informal meeting
Most districts offer a meeting with a staff appraiser before the hearing, and many protests settle there. Take an offer only if it matches your evidence.
- 04Summer
Review board hearing
If the meeting doesn’t settle it, the appraisal review board, a panel of local citizens, hears both sides and rules.
Tax Code 41.43(b)(3)
Equal appraisal
You can protest that your home is appraised unequally. The board has to rule for you unless the district shows your appraised value is at or below the median of a reasonable number of comparable homes, adjusted for their differences. Every home’s appraised value is public, so you can build this case without sale prices.
Tax Code 23.23
The 10% homestead cap
Once your home has a homestead exemption, its appraised value can’t rise more than 10% a year, plus the value of new improvements. The market value on your notice can rise faster. Check that the appraised value respects the cap.
Where you file
Williamson County appraisal district.
Every Texas county is served by an appraisal district, which sets values. The taxing units set the rates. Your notice, the protest form, and the hearing all go through the district.
- Website
- wcad.org
- Phone
- 512-930-3787
- Office
- 625 FM 1460, Georgetown, TX 78626-8050
Source Texas Comptroller, county directory, listing updated September 2, 2026. Confirm the details with the district before you file.
Every school district and city.
Which ones tax your home depends on where it sits. Your notice lists them. Rates are 2025, per $100 of taxable value. Williamson County also has 101 special districts in the rates file, including 76 municipal utility districts, 12 emergency services districts and 5 road districts. The calculator lists them.
| District | Rate |
|---|---|
| Bartlett ISD | $1.1604 |
| Burnet CISD | $0.8710 |
| Coupland ISD | $1.1922 |
| Florence ISD | $1.0182 |
| Georgetown ISD | $1.0506 |
| Granger ISD | $1.2093 |
| Hutto ISD | $1.2052 |
| Jarrell ISD | $1.1669 |
| Leander ISD | $1.0869 |
| Lexington ISD | $0.8610 |
| Liberty Hill ISD | $1.2389 |
| Pflugerville ISD | $1.1069 |
| Round Rock ISD | $0.8931 |
| Taylor ISD | $1.0638 |
| Thorndale ISD | $1.2072 |
| Thrall ISD | $1.2096 |
| City | Rate |
|---|---|
| Austin | $0.524017 |
| Bartlett | $0.6594 |
| Cedar Park | $0.3600 |
| Coupland | $0.222678 |
| Florence | $0.58255 |
| Georgetown | $0.3530 |
| Granger | $0.8400 |
| Hutto | $0.385928 |
| Jarrell | $0.394004 |
| Leander | $0.417282 |
| Liberty Hill | $0.469407 |
| Pflugerville | $0.5350 |
| Round Rock | $0.3720 |
| Taylor | $0.5850 |
| Thorndale | $0.55019 |
| Thrall | $0.44115 |
| Weir | $0.151118 |