22 U.S. Code § 4055 - Lump-sum payments
Whenever an annuitant becomes separated from the Service following a period of recall service without becoming eligible for a supplemental or recomputed annuity under section 4063 of this title, the compulsory contributions of the annuitant to the Fund for such service, together with any special contributions the annuitant may have made for other service performed after the date of separation from the Service which forms the basis for annuity, shall be returned to the annuitant (and any former spouse of the annuitant who was married to the participant during the period of recall service, in accordance with subsection (i)).
If all annuity rights under this part based on the service of a deceased participant or annuitant terminate before the total annuity paid equals the lump-sum credit to which the participant or annuitant is entitled, the difference shall be paid in accordance with subsection (f).
If a participant or former participant dies and is not survived by an individual eligible for an annuity under this part or by such an individual or individuals all of whose annuity rights terminate before a claim for survivor annuity is filed, the lump-sum credit to which the participant or annuitant is entitled shall be paid in accordance with subsection (f).
If an annuitant who was a former participant dies, any annuity accrued and unpaid shall be paid in accordance with subsection (f).
 Amounts deducted and withheld from basic salary of a participant under section 4045 of this title from the beginning of the first pay period after the participant has completed 35 years of service computed under section 4056 of this title (excluding service credit for unused sick leave under section 4056(b) of this title), together with interest on the amounts at the rate of 3 percent a year compounded annually from the date of the deduction to the date of retirement or death, shall be applied toward any special contribution due under section 4045(d) of this title), and any balance not so required shall be refunded in a lump sum to the participant after separation or, in the event of a death in service, to a beneficiary in the order of precedence specified in subsection (f).
 See Amendment of Section note below.
Section 1(a) and (c) of Ex. Ord. No. 12446, Oct. 17, 1983, 48 F.R. 48443, set out as a note under section 4067 of this title, provided that the first sentence of subsection (h) of this section, applicable (i) to contributions for civilian service performed on or after the first day of Nov. 1983, (ii) to contributions for prior refunds to participants for which application is received by the employing agency on and after such first day of Nov. 1983, and (iii) to excess contributions under section 4055(h) of this title and voluntary contributions under section 4065(a) of this title from the first day of Nov. 1983, is deemed to be amended to provide that interest shall be compounded at the annual rate of 3 percent per annum through December 31, 1984, and thereafter at a rate equal to the overall average yield to the Fund during the preceding fiscal year from all obligations purchased by the Secretary of the Treasury during such fiscal year under section 4059 of this title, as determined by the Secretary of the Treasury.
1988—Subsec. (a). Pub. L. 100–238 amended subsec. (a) generally. Prior to amendment, subsec. (a) read as follows: “Whenever a participant becomes separated from the Service without becoming eligible for an annuity or a deferred annuity under this subchapter, a lump-sum credit shall be paid to the participant (and to any former spouse of the participant, in accordance with subsection (i) of this section). A participant who becomes subject to part II of this subchapter shall be entitled to payment of the lump-sum credit if, and to the extent that, such lump-sum credit relates to service of a type described in clauses (i) through (iii) of section 302(a)(1)(C) of the Federal Employees’ Retirement System Act of 1986.”
1986—Subsec. (a). Pub. L. 99–335, § 413, inserted provision relating to payment of a lump-sum credit for a participant who becomes subject to part II of this subchapter.
Subsecs. (c), (d). Pub. L. 99–335, § 402(a)(2), substituted “part” for “subchapter”.
Subsec. (i). Pub. L. 99–335, § 404(c), inserted provision defining “creditable service” as service creditable under part I or II of this subchapter.