Short answer. Buy from a licensed dealer or a private seller who holds the title in their own name, run the VIN for recalls and title brands, get an inspection, and file the title at the Williamson County tax office within 30 days. Williamson County is an emissions county, so a passing emissions test is required before you renew registration.
About Round Rock, TX
- Dell Technologies global headquarters is at One Dell Way, Round Rock, Texas (Dell FY2026 Form 10-K).
- Texas State University runs a Round Rock Campus (101 acres).
Guides for Round Rock, TX buyers
Texas rules that apply in Round Rock, TX
- Title transfer deadline. In a private sale, the buyer must title the vehicle in their name within 30 days from the date of sale. The seller gives the buyer a properly signed title (with date of sale and odometer reading) and a signed Form 130-U showing the sales price, and the buyer files at the county tax assessor-collector office.
- Sales tax. Texas motor vehicle sales tax is 6.25 percent of the sales price minus any trade-in allowance. In a dealer sale, the dealer collects the tax and remits it to the county; in a private sale, the buyer pays the county tax assessor-collector when titling.
- New to Texas. New residents have 30 days from moving to Texas to register their vehicle, and must get a Texas driver license within 90 days of moving to the state.
- Inspection. Under House Bill 3297, non-commercial vehicles no longer need a safety inspection to register, starting January 1, 2025. Instead, all non-commercial vehicles pay a $7.50 inspection program replacement fee at registration; vehicles never registered before pay $16.75 to cover the first two years.
Where to title and register
Williamson County Tax Office - Georgetown (main)
1848 Texas Trail, Georgetown, TX 78626
Official site
Closer offices listed by the county:
- Williamson County Tax Office - Round Rock, 1801 E Old Settlers Blvd, Suite 115, Round Rock, TX 78664
Next steps
- How to buy a used car in Texas, step by step
- Look up recalls and owner complaints for the car you want
- How to spot a flood-damaged car
Frequently asked questions
Do I need an emissions test in Round Rock, TX?
Williamson County is an emissions county, so a passing emissions test is required before you renew registration.
Where do I transfer a car title in Round Rock, TX?
At the Williamson County tax assessor-collector, which handles titles and registration. Address and link are on this page.
Can Hunt Auto Group sell me a car in Round Rock, TX?
No. This site is educational. We are not a licensed Texas dealer and do not sell or arrange the sale of vehicles in Texas.
Sources
- U.S. Census Bureau population estimates
- https://www.sec.gov/Archives/edgar/data/1571996/000157199626000008/dell-20260130.htm
- https://brand.txst.edu/resources/press-kit/facts-and-data.html
- TCEQ vehicle emissions inspection counties
- TxDMV - Buying or Selling a Vehicle
- Texas Comptroller - Motor Vehicle Sales and Use Tax
- TxDMV - New to Texas
- Texas DPS - Vehicle Safety Inspection Program Changes Now in Effect
- Williamson County Tax Office - Georgetown (main)
Educational content. Anthony does not sell, broker or arrange vehicle sales in Texas. Confirm fees and rules with the office named in each source before you pay anything.
