Texas Government Code - GOV'T § 814.602. Adjustment to Annuities

(a) Except as provided by Subsection (b), the board of trustees may adopt rules that adjust or modify annuities to the extent necessary to be consistent with changes in plan design.  Any adjustment or modification must be made applicable to all members and annuitants who are similarly situated.  Any rule adopted under this section supersedes conflicting portions of existing plan provisions and must be in compliance with Section 401(a) of the Internal Revenue Code of 1986 and Section 811.006.

(b) A rule adopted under this section may not result in a reduction in any existing annuity.