Tex. Tax Code § 172.109

(a) An entity that incurs eligible costs and expenses may sell or assign all or part of the credit that may be claimed for those costs and expenses to one or more entities, and any entity to which all or part of the credit is sold or assigned may sell or assign all or part of the credit to another entity. There is no limit on the total number of transactions for the sale or assignment of all or part of the total credit authorized under this chapter, however, collectively all transfers are subject to the maximum total limits provided by Section 172.106.

(b) An entity that sells or assigns a credit under this section and the entity to which the credit is sold or assigned shall jointly submit written notice of the sale or assignment to the comptroller on a form promulgated by the comptroller not later than the 30th day after the date of the sale or assignment. The notice must include:

(1) the date of the sale or assignment;

(2) the amount of the credit sold or assigned;

(3) the names and federal tax identification numbers of the entity that sold or assigned the credit or part of the credit and the entity to which the credit or part of the credit was sold or assigned; and

(4) the amount of the credit owned by the selling or assigning entity before the sale or assignment, and the amount the selling or assigning entity retained, if any, after the sale or assignment.

(c) The sale or assignment of a credit in accordance with this section does not extend the period for which a credit may be carried forward and does not increase the total amount of the credit that may be claimed. After an entity claims a credit for eligible costs and expenses, another entity may not use the same costs and expenses as the basis for claiming a credit.

(d) Notwithstanding the requirements of this chapter, a credit earned or purchased by, or assigned to, a partnership, limited liability company, S corporation, or other pass-through entity may be allocated to the partners, members, or shareholders of that entity and claimed under this chapter in accordance with the provisions of any agreement among the partners, members, or shareholders and without regard to the ownership interest of the partners, members, or shareholders in the rehabilitated certified historic structure, provided that the entity that claims the credit must be subject to the tax imposed under Chapter 171.

(e) An entity that incurs eligible costs and expenses or to which all or part of a credit is sold or assigned and that is subject to a premium tax imposed under Chapter 221, 222, 223, or 224, Insurance Code, may claim all or part of the credit against that tax. The provisions of this chapter, including provisions relating to the total amount of the credit that may be claimed for a report, the carryforward of the credit, and the sale or assignment of the credit, apply with respect to a credit claimed against a tax imposed under Chapter 221, 222, 223, or 224, Insurance Code, to the same extent those provisions apply to a credit claimed against the tax imposed under Chapter 171 of this code. An entity claiming all or part of a credit as authorized by this subsection is not required to pay any additional retaliatory tax levied under Chapter 281, Insurance Code, as a result of claiming that credit.