Tex. BUS. ORGS Code § 401.001. DEFINITIONS.
In this title:
(1) "Mandatory application date" means:
(A) for an entity subject to this code under Section 402.001 , January 1, 2006;
(B) for an entity subject to this code under Section 402.003 or 402.004 , the date of completion of the action required by that section but no earlier than January 1, 2006; and
(C) for any other entity, January 1, 2010.
(2) "Prior law" means the applicable law in effect before January 1, 2006.