EFFECTIVE DATE OF RETIREMENT.
Tex. GOV'T Code § 814.003.
in effect(a) The effective date of a member's service retirement is the date the member designates at the time the member applies for retirement as provided by Section 814.101 , but the date must be the last day of a calendar month.
(b) If a person elects to receive a standard service retirement annuity and dies during the first calendar month that begins after the effective date of the person's retirement, the person is considered to have been a contributing member at the time of death.
(c) The retirement system may allow an applicant for retirement time after the effective date of the person's retirement to make a selection of a retirement annuity. If the applicant dies within the time allowed without having given the retirement system notice of a selection, the person is considered to have been a contributing member at the time of death.
(d) The effective date of a member's disability retirement is the date designated on the application for retirement filed by or for the member as provided by Section 814.201 , but the date must be the last day of a calendar month.
(e) If a person elects to receive a standard disability retirement annuity and dies during the first calendar month that begins after the effective date of the person's retirement, the person is considered to have been a contributing member at the time of death.