; or (2) the amount of the payments received by the candidate under this title. (b) Exception for expenditures incurred but not paid as of date of remittance (1) In general Subject to subsection (a), a candidate may withhold from the amount required to be remitted under paragraph (1) of such subsection the amount of any authorized expenditures which were incurred in connection with the candidate’s campaign but which remain unpaid as of the deadline applicable to the candidate under such subsection, except that any amount withheld pursuant to this paragraph shall be remitted to the Commission not later than 120 days after the date of the election to which such subsection applies. (2) Documentation required A candidate may withhold an amount of an expenditure pursuant to paragraph (1) only if the candidate submits documentation of the expenditure and the amount to the Commission not later than the deadline applicable to the candidate under subsection (a). D Administrative provisions 531. Administration by Commission The Commission shall prescribe regulations to carry out the purposes of this title, including regulations to establish procedures for— (1) verifying the amount of qualified contributions with respect to a candidate; (2) effectively and efficiently monitoring and enforcing the limits on the raising of qualified contributions; (3) effectively and efficiently monitoring and enforcing the limits on the use of personal funds by participating candidates