Suppose that you issue $1,000,000 par of 10-year, 6% coupon, annual-pay (to make it easier) bonds for $1,050,000 (i.e., at a premium). The effective interest rate (YTM) is 5.3417%, and you use the effective interest rate method to amortize the premium. Your fiscal year is a calendar year: 1/1 to 12/31; coupons are paid on 12/31 each year.
Every year, your interest incurred is $60,000 (= 6% × $1,000,000).
The first year your interest expense will be $56,088 (= 5.3417% × $1,050,000), and the bond premium amortization will be -$3,912 (= $56,088 – $60,000). Bonds payable at the end of the year will be $1,046,088 (= $1,050,000 – $3,912).
The second year, your interest expense will be $55,879 (= 5.3417% × $1,046,088), and the bond premium amortization will be -$4,121 (= $55,879 – $60,000). Bonds payable at the end of the year will be $1,041,966 (= $1,046,088 – $4,121, with slight rounding error).
And so on.
Suppose that, at the beginning of the second year, you have interest payable of $10,000. In the second year, you pay only $55,000 in coupon (maybe you have a cash flow problem). Then at the end of the second year your interest payable is $15,000 (= $10,000 + $60,000 – $55,000).
Here are some examples of the calculations (for year 2) that you might have to do on the exam:
- Given:
- Coupon of $60,000
- Premium amortization of $4,121
What is interest expense?
Answer:
$60,000 – $4,121 = $55,879
- Given:
- Interest expense of $55,879
- Premium amortization of $4,121
- Beginning interest payable of $10,000
- Ending interest payable of $15,000
What is interest paid (i.e., cash flow)?
Answer:
$15,000 – $10,000 – $55,879 – $4,121 = -$55,000
(Note: this is interest paid, so the cash flow is negative (an outflow).)
- Given:
- Interest expense of $55,879
- Premium amortization of $4,121
- Beginning interest payable of $10,000
- Interest paid of $55,000
What is ending interest payable?
Answer:
$10,000 + $55,879 + $4,121 – $55,000 = $15,000
And so on.