Comparison of Amortization Methods
Below is a comparison of the amount of interest expense reported under the effective interest rate method and the straight-line method. Note that under the effective interest rate method the interest expense for each year is decreasing as the book value of the bond decreases. Under the straight-line method the interest expense remains at a constant annual amount even though the book value of the bond is decreasing. The accounting profession prefers the effective interest rate method, but allows the straight-line method when the amount of bond premium is not significant.
Notice that under both methods of amortization, the book value at the time the bonds were issued ($104,100) moves toward the bond's maturity value of $100,000. The reason is that the bond premium of $4,100 is being amortized to interest expense over the life of the bond.Reference:
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