Advances or reimbursements received pursuant to agreements executed under this section in which reimbursement will not be completed within one hundred and eighty days after the close of the fiscal year in which such services and commodities are delivered:
Provided, That such agreements require the payment of interest at the current rate established pursuant to
section 635(b)(1)(B) of title 12, and repayment of such principal and interest does not exceed a period of three years from the date of signing of the agreement to provide the service:
Provided further, That funds available for this paragraph in any fiscal year shall not exceed $1,000,000 of the total funds authorized for use in such fiscal year by part I of subchapter I of this chapter, and shall be available only to the extent provided in appropriation Acts. Interest shall accrue as of the date of disbursement to the agency or organization providing such services.