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Tax Home Page

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Trailer Information

Exemption for Motor Vehicles Sales Tax

Beginning Jan. 1, 2012, a person claiming an exemption from motor vehicle sales tax and limited sales tax on the purchase of certain items used in the production of agricultural and timber products will be required to have a Texas Agriculture and Timber Exemption Registration Number (Ag/Timber Number). This will not be their social security number. Farmers can apply for their 11 digit farm registration number at

Apply or obtain copy of AG/Timber permit


Farm License Plates

Effective September 1, 2013, an application for farm license plates, renewal of existing farm license plates, and application for excess weight permits for farm motor vehicles, trailers, and semitrailers requires the applicant to present proof of a Texas Agricultural and Timber Exemption Registration Number. Get your copy at

Apply or obtain copy of AG/Timber permit

Shopmade/Homemade Trailers 

All shopmade/homemade and farm trailers must have an identification number assigned. Please print our information guide for homemade trailers. Requirements may vary based on transaction. 

Additional Trailer Information

Texas Department of Motor Vehicles Trailer Information 

If you need law enforcement to inspect your trailer VIN and/or issue a 68A form, click here to view the inspection schedule on our calendar.  

For information regarding required documentation, fees and trailers with a gross weight exceeding 4,000 pounds, contact our office at 512-943-1602. 

All transactions require original signed documents. Faxed, scanned or emailed copies are not acceptable and signatures must be in ink. Information is  based on actual owner transactions

Office Calendar and Tax Office Closings

Tax Office Calendar

Click here to see a calendar of upcoming office closures and important dates.

Regular Office Hours

Georgetown, Round Rock, Cedar Park
Monday 8:00 a.m.- 5:30 p.m.
Tuesday thru Friday 8:00 a.m- 4:30 p.m.

Monday thru Friday 8:00 a.m.- 5:00 p.m

Payment drop boxes located inside office lobbies.

 The Georgetown office is the only location with an outside night deposit drop box.

   Mailing address for correspondence and payments

Williamson County Tax Office
904 S. Main Street
Georgetown, TX 78626

Checks and money orders should be made payable to Larry Gaddes, CTA.
Payments made by check may be converted to an electronic funds transfer.
Failure to use correct mailing address will cause processing delays.

Williamson County Courthouse
710 Main Street Georgetown, TX 78626
Main Telephone: (512)943-1100
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