County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in Williamson County, Texas

Williamson County has an effective property tax rate of 1.61%. On the median home value of $447,000, that's roughly $7,205 per year. Median household income is $111,340.

Effective Property Tax Rate1
1.61%
median tax $7,205 ÷ median home $447,000
Median Home Value1
$447,000
owner-occupied
Median Household Income1
$111,340
per-capita $53,505
Est. Annual Tax on Median Home1
$7,205
at 1.61% effective rate

What you'll pay, at a glance

Property taxes are the largest local tax most homeowners pay. The effective rate measures the real tax bill as a share of home value — a more useful number than the nominal “mill rate,” because assessment practices vary county to county.

MetricWilliamson CountyTexas (state context)
Effective property tax rate11.61%1.18%
Median home value1$447,000
State income tax3No state income taxNo state income tax
State sales tax38.20% combined8.20% combined

How this is calculated

The effective property tax rate is the median real-estate tax bill divided by the median home value — both for owner-occupied homes, from the U.S. Census Bureau's American Community Survey (ACS 5-year estimates)1. Median income is also from the ACS1. Federal and state income-tax figures use IRS2 and Tax Foundation3 data.

About Williamson County, TX

Williamson County’s effective property tax rate of 1.612% sits well above both the Texas median of 1.183% and the national median of 0.794%. That gap signals a heavier reliance on property taxes to fund local services than is common elsewhere. A median home value of $447,000 produces an annual tax bill of about $7,205, a meaningful expense even against a median household income of $111,340. The county ranks 26th out of 250 Texas counties for its rate, placing it in the higher tier statewide. Communities such as Round Rock and Georgetown anchor this fast-growing area north of Austin, where rising home values and elevated rates combine to shape what owners owe each year.

Frequently asked questions

What is the property tax rate in Williamson County, TX?
The effective rate is 1.61% — meaning the median tax bill equals about 1.61% of the median home value.
How much are property taxes on a median home?
On the median home ($447,000), the estimated annual bill is about $7,205.
Is Williamson County's rate high or low?
Compare it to the state median of 1.18% and the national average near 1.1%.
How does the effective rate differ from my mill rate?
A mill rate is the nominal levy per $1,000 of assessed value. The effective rate reflects what you actually pay after exemptions and assessments — it's the median tax bill as a share of median home value, so it better predicts your real cost.
Will a reassessment raise my tax bill?
Not necessarily. If your home's assessed value rises, your bill can go up, but only if the mill rate and exemptions stay flat. Contact the Williamson County assessor's office to review your current assessment.
Can I appeal my property tax assessment?
Yes. Most counties allow an appeal when you believe the assessed value exceeds the market value. File with the Williamson County assessor within the local deadline, typically with comparable sales as evidence.
Sources
[1] U.S. Census Bureau — ACS 5-Year (2023) — Median home value (B25077), median real-estate taxes (B25103), median household income (B19013), per-capita income (B19301).
[2] IRS — Statistics of Income — County income, AGI, and real-estate taxes paid.
[3] Tax Foundation — State income, sales, corporate, and estate/inheritance tax rates.