The instrument referred to as a credit security bond or repayment guarantee functions as a form of collateral intended to secure the repayment of either a commercial or private loan. Typically, the issuance of a loan is contingent upon the borrower, or a third party, providing collateral. Consequently, the borrower acquires this guarantee to serve as an alternative to traditional loan collateral for the benefit of the lender. In general, the lender is entitled to make claims under this guarantee by formally notifying in writing that the borrower has failed to repay the loan or any remaining balance upon its due date.