Texas Government Code - GOV'T § 813.201. Current Service

(a) Except as otherwise provided by this section, service is credited in the applicable membership class for each month in which a member holds a position and for which the required contributions are made by the member and the state.

(b) A member may not accrue or establish service credit in the employee class of membership when the total amount of service credit, multiplied by the percentage in effect for computing annuities under Section 814.103, 814.105, or 814.107 would exceed the number 100.  When the maximum amount of service credit is accrued or established by a member in the employee or elected class, member and state contributions cease, although the member retains membership subject to Section 812.005.

(c) Service may not be credited in both membership classes for the same period unless one of the credits is for service established under Section 813.402 of this subtitle.