Texas Government Code - GOV'T § 815.507. Plan Qualification

(a) It is intended that the provisions of this subtitle be construed and administered in a manner that the retirement system's benefit plan will be considered a qualified plan under Section 401(a) of the Internal Revenue Code of 1986 (26 U.S.C. Section 401). The board of trustees may adopt rules that modify the plan by adding, deleting, or changing a plan provision, including rules that modify benefits available under the plan.  

(b) A rule reducing a benefit provision may not be adopted unless the modification is necessary for the retirement system to be a qualified plan.

(c) A rule adopted under this section, other than a rule adopted under Subsection (b), must be made applicable to all members and annuitants whose credit or benefits are based on similar service.  A rule adopted under this section may include the making or revocation of any election permitted under Section 401(a) or any other provision of the Internal Revenue Code of 1986 (26 U.S.C. Section 401). A rule adopted under this section must comply with Section 811.006 and Section 401(a) of the Internal Revenue Code of 1986 (26 U.S.C. Section 401). Rules adopted by the board of trustees are to be considered a part of the plan and supersede conflicting portions of existing plan provisions.

(d) In determining qualification status under Section 401(a) of the Internal Revenue Code of 1986 (26 U.S.C. Section 401), the retirement system's benefit plan shall be considered the primary retirement plan for members of the retirement system.