Texas Tax Code - TAX § 171.151. Privilege Period Covered by Tax

(1) an initial period beginning on the taxable entity's beginning date and ending on the day before the first anniversary of the beginning date;

(2) a second period beginning on the first anniversary of the beginning date and ending on December 31 following that date; and

(3) after the initial and second periods have expired, a regular annual period beginning each year on January 1 and ending the following December 31.