Under such regulations as may be prescribed by the Director, a participant may voluntarily contribute additional sums in multiples of one percent of the participant’s basic pay, but not in excess of 10 percent of such basic pay.
The benefits provided by subsection (b)(2), (3), or (4) shall be actuarially equivalent in value to the payment provided for in subsection (b)(1) and shall be calculated upon such tables of mortality as may be from time to time prescribed for this purpose by the Director.
A voluntary contribution account shall be paid in a lump sum at such time as the participant dies or separates from the Agency without entitlement to an annuity. In the case of death, the account shall be paid in the order of precedence specified in section 2071(c) of this title.
Any benefit payable to a participant or to the participant’s beneficiary with respect to the additional contributions provided under this section shall be in addition to benefits otherwise provided under this subchapter.