Tex. Parks & Wild. Code § 71.010

The license period for licenses issued under this chapter is September 1 or another date set by the commission through August 31 of the next year or another date set by the commission, and a license is current and valid only for the license period for which it is issued. The commission by rule may set the amount of a license fee for a license issued during a transition period at an amount lower than prescribed in this chapter and provide for a license term for a transition period that is shorter or longer than a year.