Tex. Agric. Code § 55.007
(a) The board of directors of an association formed under this chapter may authorize the purchase of the association's capital stock at the book value conclusively determined by the board and pay cash for the stock within one year thereafter if:
Acts 1981, 67th Leg., p. 1122, ch. 388, Sec. 1, eff. Sept. 1, 1981.