Home
/US Property Taxes
/Texas
/Williamson County
/Round Rock

Round Rock, Williamson County, Texas Property Taxes

$774 avg. annual savings
No Upfront Costs
You only pay if we save

Property Taxes in Round Rock, Texas

  • Median Round Rock, Texas effective property tax rate: 1.45%, significantly higher than the national median of 1.02%, and lower than the Texas state median of 1.48%.

  • Median Round Rock, Texas home value: $419,972

  • Median annual Round Rock, Texas tax bill: $6,226, $3,826 higher than the national median property tax bill of $2,400.

How are property taxes in Williamson County calculated?

Property taxes in Round Rock, Texas are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.

Understanding Round Rock's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Round Rock, knowing local tax details benefits homeowners and investors.

Last Updated April 13, 2026

Round Rock, Williamson County, Texas Property Tax Bill Calculator

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

1.45%

Estimate Property Tax Bill

$6,090

$5,651

SAVE WITH OWNWELL

$774

Average Annual Tax Savings

How Does the Round Rock Property Tax Calculator Work?

Use this Round Rock property tax calculator to estimate your annual tax bill. Enter your property's assessed value and our calculator applies Round Rock's median effective tax rate of 1.45% — based on actual property records in Williamson County — to generate your estimate.

Enter your property's estimated assessed value — the figure the local appraisal district uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Round Rock's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.

Your bill may vary by ZIP code within Round Rock: rates range from 1.45% in 78664 to 1.45% in 78665, primarily due to differences in school district levies and local assessment districts.

If your estimate is higher than expected, Ownwell can appeal your Round Rock assessment — you only pay if we save you money.

About Round Rock Property Taxes

About Property Taxes in Round Rock, Williamson, Texas

Round Rock’s median effective property tax rate of 1.45% is lower than the Texas state median of 1.48% and higher than the national median of 1.02%. This rate reflects the Williamson County base levy combined with local school district levies and Municipal Utility Districts that vary by subdivision throughout the city.

Property tax rates are not uniform across Round Rock. Homeowners in the 78665 ZIP code carry a median effective rate of 1.49%, while those in 78664 pay 1.35%. This spread reflects how school district boundaries and local assessment districts are drawn across Williamson County. Understanding which part of Round Rock you live in can make a meaningful difference to your annual tax bill.

Round Rock homeowners who believe their assessed value is too high can file a formal appeal with the local Appraisal District before the May 15, 2026 deadline each year.

If your estimated bill above seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.

Property Tax Rates Across Round Rock, Williamson County, Texas

As noted earlier, local government entities set tax rates, which can vary widely within a state.

Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.

While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.

Below, you can compare Round Rock's effective property tax rate to other cities in Texas and the median property tax rates in Texas and the U.S.

Property Tax Rates Across Round Rock, Williamson County, Texas

Source: Ownwell

0.98%

1.52%

2.06%

Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.

Median Effective Round Rock Tax Rate

1.45%

Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.

Median Effective Williamson County Tax Rate

1.53%

Median Effective Texas Tax Rate

1.48%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Round Rock, Williamson County, Texas

Zip10th Percentile25th PercentileMedian Tax Rate75th Percentile90th Percentile
786640.66%1.17%1.35%1.75%1.75%
786651.02%1.27%1.49%1.75%1.98%
786810.78%1.29%1.44%1.71%1.75%

Source: Ownwell

Property Tax Assessment Values Across Round Rock, Williamson County, Texas

When examining property taxes in Round Rock, Texas, understanding the distinction between "market value" and "assessed value" is crucial.

The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The Williamson County appraisal district estimates the market value for tax purposes.

The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.

Assessment notices:

In Williamson County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of April.

Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in Round Rock.

For example, the median home price in Round Rock is $419,972, with tax bills ranging significantly across the county. 78681 has the highest median home price at $469,728.

Property Tax Assessment Values Across Round Rock, Williamson County, Texas

Source: Ownwell

$34,594

$349,717

$664,840

Median Round Rock Market Value

$419,972

Median Williamson County Market Value

$408,017

Median Texas Market Value

$258,851

Median United States Market Value

$235,294

Property Tax Assessment Values Across Round Rock, Williamson County, Texas

Zip10th Percentile25th PercentileMedian Home Price75th Percentile90th Percentile
78664$279,251$310,874$351,665$432,150$580,573
78665$334,046$373,279$430,702$520,508$639,174
78681$308,706$379,306$469,728$589,725$717,320

Source: Ownwell

Property Tax Bills Across Round Rock, Williamson County, Texas

Property tax bills in Round Rock are based on the assessed value of a home and the local tax rates set by taxing authorities. For homeowners, that means a higher market value can lead to a higher bill, while exemptions and successful appeals can help lower what is owed. In Williamson County, the median home price is $419,972, and property tax bills vary widely across the city. The 25th percentile tax bill is $4,609, the 75th percentile is $8,111, and the 90th percentile reaches $10,147. That range shows how much a property tax bill can affect household budgets.

Ownwell helps homeowners challenge unfair assessments and find exemptions that may reduce their property tax bills. By reviewing your property’s assessed value and identifying savings opportunities, Ownwell can help you keep more money in your pocket while making sure you only pay your fair share.

Property Tax Bills Across Round Rock, Williamson County, Texas

Source: Ownwell

$462

$5,212

$9,962

Median Round Rock Tax Bill

$6,226

Median Williamson County Tax Bill

$6,257

Median Texas Tax Bill

$3,441

Median United States Tax Bill

$2,400

Property Tax Bills Across Round Rock, Williamson County, Texas

Zip10th Percentile25th PercentileMedian Tax Bill75th Percentile90th Percentile
78664$2,235$3,835$5,065$6,517$8,357
78665$3,849$5,137$6,683$8,467$10,115
78681$3,210$4,977$6,682$8,776$10,932

Source: Ownwell

Don't miss the deadline to protest!

Frequently Asked Property Tax Questions in Round Rock, Texas

How are property taxes calculated in Round Rock, Texas?
Property taxes in Round Rock, Texas are calculated by multiplying your property's assessed value by the applicable tax rate set by local taxing authorities. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions.
How do I appeal my property taxes in Round Rock, Texas?
To appeal your property taxes in Round Rock, Texas, you typically need to file a formal protest or appeal with your local appraisal district or assessor's office by the stated deadline. You'll need evidence such as comparable sales, a recent independent appraisal, or documentation of property condition issues. Ownwell can handle this entire process for you.
What property tax exemptions are available in Round Rock, Texas?
Common property tax exemptions in Round Rock, Texas include homestead exemptions for primary residences, senior citizen exemptions, veteran exemptions, and disability exemptions. Exemption amounts and eligibility requirements vary by county. Contact your local appraisal district or check Ownwell for details specific to your property.
When are property taxes due in Round Rock, Texas?
Property tax deadlines in Round Rock, Texas vary by county but typically include an assessment notice period in spring or early summer, followed by an appeal deadline, and a tax payment due date in the fall or winter. Check with your county assessor's office for specific dates in your area.
How can Ownwell help reduce my property taxes in Round Rock, Texas?
Ownwell provides professional property tax appeal services in Round Rock, Texas. Our team analyzes your assessment, gathers evidence, files all paperwork, and represents you at hearings — all with no upfront cost. You only pay a percentage of your savings if we successfully lower your tax bill.