Payments under this chapter may be made in installments, and in advance or by way of reimbursement, as the Office may determine, with necessary adjustments on account of overpayments or underpayments. ( Pub. L. 91–648, title V, § 512 , Jan. 5, 1971 , 84 Stat. 1929 ; 1978 Reorg. Plan No. 2, § 102, eff. Jan. 1, 1979 , 43 F.R. 36037 , 92 Stat. 3783 .) Editorial Notes References in Text This chapter, referred to in text, means the provisions of subchapters I, II, III, and IV of this chapter. See section 4761 of this title . Executive Documents Transfer of Functions “ Office ”, meaning Office of Personnel Management , substituted in text for “Commission”, meaning Civil Service Commission, pursuant to Reorg. Plan No. 2 of 1978, § 102, 43 F.R. 36037 , 92 Stat. 3783 , set out under section 1101 of Title 5 , Government Organization and Employees, which transferred functions vested by statute in Civil Service Commission and Chairman thereof to Director of Office of Personnel Management (except as otherwise specified), effective Jan. 1, 1979 , as provided by section 1–102 of Ex. Ord. No. 12107 , Dec. 28, 1978 , 44 F.R. 1055 , set out under section 1101 of Title 5 .