When a PIA used in computing a retirement annuity can be increased for DRC's.

§ 225.35 When a PIA used in computing a retirement annuity can be increased for DRC's. Delayed retirement credits earned at different times are added to the PIA used in computing a retirement annuity as follows: DRC's earned for month in Are added to PIA Years before the year the employee annuity begins On the date the annuity begins. Year the annuity begins On January 1 of the year after the annuity begins. Years after the annuity begins, and before the year the employee attains age 70 (72 before 1984) On January 1 of the year after the credits are earned. Year the employee attains age 70 (72 before 1984) In the month age 70 (or 72) is attained.