CFR /  Title 5  /  Part 839  /  Sec. 839.1116 If, because of the change in my retirement coverage, will I have to pay the additional deposit due or will OPM actuariallyreduce my annuity?

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.