5 CFR § 838.231
Commencing date of payments
November 4, 2020
(a) A court order acceptable for processing is effective against employee annuity accruing beginning the first day of the second month after OPM receives the court order.
(b)
(1) OPM will not begin payments to the former spouse until OPM receives all the documentation required by §838.221 (b) and (c).
(2) If payments are delayed under paragraph (b)(1) of this section, after OPM receives all required documentation, it will authorize payment of the annuity that has accrued since the date determined under paragraph (a) of this section but the payment of which was delayed under paragraph (b)(1) of this section.