25 U.S.C. § 1481: Loan guaranties and insurance

(a) In generalIn order to provide access to private money sources which otherwise would not be available, the Secretary may—(1) guarantee not to exceed 90 per centum of the unpaid principal and interest due on any loan made to any organization of Indians having a form or organization satisfactory to the Secretary, and to individual Indians; or (2) insure loans under an agreement approved by the Secretary whereby the lender will be reimbursed for losses in an amount not to exceed 15 per centum of the aggregate of such loans made by it, but not to exceed 90 per centum of the loss on any one loan. (b) Eligible borrowersThe Secretary may guarantee or insure loans under subsection (a) to both for-profit and nonprofit borrowers.