Sec. 21.107.  LIABILITY OF SHAREHOLDER.  The existence of or a performance under a shareholders' agreement authorized by this subchapter is not a ground for imposing personal liability on a shareholder for an act or obligation of the corporation by disregarding the separate existence of the corporation or otherwise, even if the agreement or a performance under the agreement:
(1)  treats the corporation as if the corporation were a partnership or in a manner that otherwise is appropriate only among partners;
(2)  results in the corporation being considered a partnership for purposes of taxation;  or
(3)  results in failure to observe the corporate formalities otherwise applicable to the matters governed by the agreement.
Acts 2003, 78th Leg., ch. 182, Sec. 1, eff. Jan. 1, 2006.