Tex. Tax Code § 111.205
(a) The limitation provided by Section 111.201 of this code does not apply and the comptroller may assess a tax imposed by this title at any time if:
Acts 1981, 67th Leg., p. 1509, ch. 389, Sec. 1, eff. Jan. 1, 1982.
Amended by Acts 1983, 68th Leg., p. 459, ch. 94, Sec. 4, eff. May 10, 1983;
Acts 1993, 73rd Leg., ch. 587, Sec. 10, eff. Sept. 1, 1993.