ROUND ROCK Sales Tax Overview
As of 2026, ROUND ROCK, Texas has an average combined sales tax rate of 8.25%, with rates varying across 3 zip codes from 8.25% to 8.25%. This rate includes the Texas state tax of 6.25% plus applicable county and local taxes.
Different areas within ROUND ROCK may have different rates due to special tax districts, transit authority taxes, or other local levies. It is important to use your exact zip code when calculating taxes for purchases, business filings, or compliance purposes.
ROUND ROCK Tax Examples
* Based on average rate of 8.25%. Verify with your exact zip code.
ROUND ROCK Zip Codes & Tax Rates
Frequently Asked Questions
What is the sales tax rate in ROUND ROCK, TX?
The average sales tax rate in ROUND ROCK, TX is 8.25% as of 2026. This includes the 6.25% Texas state tax plus any county and city taxes.
How many zip codes are in ROUND ROCK, TX?
ROUND ROCK, TX has 3 zip codes in our database: 78680, 78682, 78683.
How much is sales tax on a $100 purchase in ROUND ROCK?
On a $100 purchase in ROUND ROCK, TX you would pay approximately $8.25 in sales tax at the average rate of 8.25%, for a total of $108.25.
Is ROUND ROCK's sales tax rate higher than the Texas average?
Use our calculator to compare ROUND ROCK's rate of 8.25% against other cities in Texas. Visit the Texas state page for the statewide average.