Using the effective-interest method, the amount of bond discount to be amortized for a given period is calculated by:
- deducting the amount of cash interest for the period from the amount of interest expense for the period.
- adding the amount of cash interest for the period and the amount of interest expense for the period.
- deducting the amount of interest expense for the period from the carrying value of the liability.
- multiplying the carrying value of the bond at the beginning of the period by the stated interest rate.