- Amortizing loan
bankingand finance, an amortizing loan is a loan where the principal of the loan is paid down over the life of the loan, according to some amortization schedule, typically through equal payments.
Similarly, an amortizing bond is a bond that repays part of the principal (
face value) along with the coupon payments. Compare with a sinking fund, which amortizes the total debt outstanding by repurchasing some bonds.
Each payment to the lender will consist of a portion of interest and a portion of principal.
Mortgage loans are typically amortizing loans. The calculations for an amortizing loan are those of an annuity using the time value of moneyformulas, and can be done using an amortization calculator
An amortizing loan should be contrasted with a
bullet loan, where a large portion of the loan will be paid at the final maturity date instead of being paid down gradually over the loan's life.
Amortization of debt has two major effects:;Credit risk: First and most importantly, it substantially reduces the
credit riskof the loan or bond. In a bullet loan(or bullet bond), the bulk of the credit risk is in the repayment of the principal at maturity, at which point the debt must either be paid off in full or rolled over. By paying off the principal over time, this risk is mitigated.
;Interest rate risk: A secondary effect is that amortization reduces the duration of the debt, reducing the debt's sensitivity to
interest rate risk, as compared to debt with the same maturity and coupon rate. This is because there are smaller payments in the future, so the weighted-average maturity of the cash flows is lower.
weighted averageof the times of the principal repayments of an amortizing loan is referred to as the weighted-average life(WAL), also called "average life". It's the average time until a dollar of principal is repaid.
In a formula,:where:
* is the principal,
* is the principal repayment in coupon , hence
* is the fraction of the principal repaid in coupon , and
* is the time from the start to coupon .
[http://abe5.com/88d Amortizing Loan]
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