Texas Transportation Code - TRANSP § 548.257. Timing of Inspection for Registration-Based Enforcement

(1) for initial registration, not earlier than 90 days before the date of registration;

(2) for a renewal of registration, not earlier than 90 days before the date of expiration of the vehicle's registration;

(3) if the vehicle is a used motor vehicle sold by a dealer, as defined by Section 503.001, in the 180 days preceding the date the dealer sells the vehicle;  or

(4) if the vehicle is subject to the federal motor carrier safety regulations, in a period that complies with those regulations.