Texas Government Code - GOV'T § 824.803. Computation of Participant's Service and Annuity

(a) A person participating in the plan remains a member of the retirement system during the period of participation, unless the member terminates membership under Section 822.003, but the member may not, during participation, accrue additional service credit.  The member shall make employee contributions to the retirement system, and the state and the member's employing district, if applicable, shall make contributions for the member's service performed during the member's participation in the plan.  Member contributions made during the period of participation in the plan are not eligible for withdrawal by the participant and are deposited in the retired reserve account.  The member and the state retain the obligation to contribute under Sections 1575.202 and 1575.203, Insurance Code, during the member's participation in this plan.

(b) For purposes of the plan, the computation of the service retirement annuity of a member participating in the plan is determined as of the effective date of participation.  A participating member is not eligible to receive a postretirement increase made applicable to annuitants during the member's participation in the plan.

(c) An election to participate in the plan constitutes a deadline for the purchase of special service credit.