What is the sales tax rate in Round Rock, Texas?

The combined sales tax rate in Round Rock, Texas is 8.300% as of 2026. This includes the Texas state rate of 6.300% plus local jurisdiction taxes.

How is the Round Rock sales tax calculated?

Multiply your purchase amount by 8.300% (or 0.00830) to get the tax owed. For example, a $100 purchase incurs $8.30 in sales tax.

What is the Texas state sales tax rate?

The base Texas state sales tax rate is 6.300%. Local jurisdictions may add additional taxes on top of this rate.

Does Round Rock have a county sales tax?

Round Rock does not levy an additional county-level sales tax beyond the state base rate.

When was the Round Rock sales tax rate last updated?

The Round Rock sales tax rate was last verified on March 27, 2026. We cross-reference all rates against the official State Department of Revenue data.

Live Data: April 2026

Round Rock, TX Sales Tax Rate 2026

The combined sales tax rate in Round Rock, Texas is 8.300%.

Combined Rate 8.300%

State6.300%

Round Rock Sales Tax Breakdown

Jurisdiction	Rate
Texas State Sales Tax	6.300%
Special District Tax	2.000%
Total Combined Rate	8.300%

Which County Is Round Rock In?

Round Rock falls within Williamson, Texas. Williamson imposes a 0.000% county-level sales tax in addition to the Texas state base rate.

Round Rock ZIP Codes

The following ZIP codes are mapped to Round Rock for sales tax purposes. All listed codes apply the 8.300% combined rate.

78664 78665 78681

Nearby Tax Rates

Pflugerville 6.4 mi

8.300%

Combined Rate

View Local Rates

Business Nexus in Texas

Economic Nexus Threshold

Selling into Texas from out of state? Once you exceed $500,000 in annual sales or 0 transactions, you must register and collect Texas sales tax.

FAQ: Round Rock Sales Tax

The combined sales tax rate in Round Rock, Texas is 8.300% as of 2026.

Multiply your purchase price by 8.300% to find the tax owed. A $500 purchase would include $41.50 in sales tax.

Groceries are generally taxable in Texas. Check the official Department of Revenue for specific exemptions.

Vehicle purchases in Round Rock are subject to the 8.300% combined rate, though some states apply different rules for vehicle sales. Verify with the Texas Department of Revenue or DMV.

Register for a sales tax permit through the official Texas Department of Revenue website. Registration is typically free and required before collecting any sales tax.

Sales Tax Calculator

Using 8.300% rate for Round Rock, TX

Purchase Amount ($)

Tax Amount $0.00

Total with Tax $100.00

Rate applied: 8.300% combined

Official Tax Authority

Texas Comptroller of Public Accounts

Filing Deadline: Monthly returns due the 20th; quarterly/annual returns vary. File via Texas Comptroller eSystems.

Visit Official Portal (800) 252-5555