5 CFR § 839.1116
If, because of the change in my retirement coverage, I will owe larger deposits for military and civilian service credit, will I have to pay the additional deposit due or will OPM actuarially reduce my annuity?
November 4, 2020
You can choose to pay the additional deposit amount. If you choose not to pay the deposit, OPM will actuarially reduce your annuity, as explained in 831.303(d) of this chapter.