34 Tex. Admin. Code § 121.6
All applications for retirement, whether for service or for disability, must be filed not less than 30 nor more than 90 days prior to the date specified by the member as the effective date of his or her retirement; the date specified as the effective date for retirement must be the last day of a calendar month and may not be a date preceding the termination of the member's employment with the participating municipality. A member who files an application for retirement with the system on or before the effective date of retirement shall be deemed to have waived the requirement to file the application at least 30 days before the effective date of retirement. An application is filed when it is actually received at the office of the director of the system in Austin.
Source Note:The provisions of this §121.6 adopted to be effective January 22, 2001, 26 TexReg 980; amended to be effective April 22, 2002, 27 TexReg 3363.