In: Accounting
When the bond is issued at discount or premium it needs to be written off during its life.
Straight-line amortization is a method of allocating discount to a bond equally throughout its life. This method amortizes the premium/discount over the life of the bond similar to the straight-line method of depreciation.
To amortize the discount, first, we need to calculate the amortization discount to be written off with every semi annual interest payments:
| Particulars | Amount | |
| Face Value of 11% Bonds | A | $180,000 | 
| Issue Value of 10% Bonds | B | $170,000 | 
| Discount on issue | C=A-B | $10,000 | 
| Period = 10 Years i.e. 20 Semi annual | D | 20 | 
| Semiannual amortization amount | E=C/D | $500 | 
(a) Journal Entry for issuance of the bonds:
| Date | Account and explanations | Debit | Credit | 
| Dec .31, 2018 | Cash | $170,000 | |
| Discount on Bonds Payable | $10,000 | ||
| Bonds Payable | $180,000 | ||
| (To Record issuance of Bonds) | 
(b) Journal Entry for payment of interest and the discount amortization on June 30, 2019.
| June .30, 2019 | Interest Expense | $10,400 | |
| Discount on Bonds Payable | $500 | ||
| Cash | $9,900* | ||
| (To Record issuance of Bonds) | |||
| (* Interest to be paid = $180,000*11%/2 = $9,900) | |||
(c) Journal Entry for payment of interest and the discount amortization on December 30, 2019.
| Date | Account and explanations | Debit | Credit | 
| Dec .31, 2019 | Interest Expense | $10,400 | |
| Discount on Bonds Payable | $500 | ||
| Cash | $9,900* | ||
| (To Record issuance of Bonds) | |||
| (* Interest to be paid = $180,000*11%/2 = $9,900) | |||
(d) Journal Entry for the retirement of the bonds:
| Date | Account and explanations | Debit | Credit | 
| Dec .31, 2028 | Bonds Payable | $180,000 | |
| Cash | $180,000 | ||
| (To Record Redemption of Bonds) |