5 U.S.C. § 8421: Annuity supplement

Subject to paragraph (3), an individual shall, if and while entitled to an annuity under subsection (a), (b), (d)(1), or (e) of section 8412, or under section 8414(c), also be entitled to an annuity supplement under this section. Subject to paragraph (3), an individual shall, if and while entitled to an annuity under section 8412(f), or under subsection (a) or (b) of section 8414, also be entitled to an annuity supplement under this section if such individual is at least the applicable minimum retirement age under section 8412(h). An individual whose entitlement to an annuity under section 8412 or 8414 does not commence before age 62 is not entitled to an annuity supplement under this section. An individual entitled to an annuity supplement under this section ceases to be so entitled after the last day of the month preceding the first month for which such individual would, on proper application, be entitled to old-age insurance benefits under title II of the Social Security Act, but not later than the last day of the month in which such individual attains age 62. an amount determined under paragraph (2), multiplied by a fraction, as described in paragraph (3). only basic pay for service performed (if any) shall be taken into account in computing the total wages and self-employment income of the annuitant for a benefit computation year; for a benefit computation year which commences after the date of the separation with respect to which entitlement to the annuitant’s annuity under this subchapter is based and before the date as of which such annuitant is treated, under the preceding sentence, to have attained age 62, the total wages and self-employment income of such annuitant for such year shall be deemed to be zero; and the average total wages of all workers for that year, multiplied by the numerator of which is the total basic pay of the individual for service performed in the first year thereafter in which such individual performed a full year of service; and the denominator of which is the average total wages of all workers for the year referred to in subclause (I). the numerator of which is the annuitant’s total years of service (rounding a fraction to the nearest whole number, with ½ being rounded to the next higher number), not to exceed the number under subparagraph (B); and the denominator of which is 40. the term “benefit computation year” has the meaning provided in section 215(b)(2)(B)(i) of the Social Security Act; the term “average total wages of all workers”, for a year, means the average of the total wages, as defined and computed under section 215(b)(3)(A)(ii)(I) of the Social Security Act for such year; and the term “service” does not include military service. An amount under this section shall, for purposes of section 8467, be treated in the same way as an amount computed under section 8415.