Pay off debts. At the end of the loan term, the principal repaid by bonds is called debt repayment, and the maturity repayment is also called maturity repayment. Refers to the debt repayment method of repaying the principal in one lump sum according to the time specified at the time of bond issuance. Interim repayment, also known as midway repayment, refers to the repayment of part or all of the principal before the final maturity of the bond.