The Secretary may obtain such information as is reasonably necessary regarding the income of a borrower (and the borrower’s spouse, if applicable) of a loan made under this part that is, or may be, repaid pursuant to income contingent repayment, for the purpose of determining the annual repayment obligation of the borrower. Returns and return information (as defined in section
6103 of title
26) may be obtained under the preceding sentence only to the extent authorized by section
6103
(l)(13) of title
26. The Secretary shall establish procedures for determining the borrower’s repayment obligation on that loan for such year, and such other procedures as are necessary to implement effectively income contingent repayment.