What it means
The most common accounting meaning concerns issue discount or premium. A bond issued for less than face value creates a discount that is written off over the term, raising interest expense above the cash coupon and lifting the carrying value towards face value by maturity.
This matters because the cash coupon alone tells you very little about true borrowing cost. A company that issues $500,000 of bonds and receives only $460,000 is paying for that shortfall, and spreading the $40,000 across the term is what makes reported interest expense reflect economic reality.
The required approach in most accounting frameworks is the effective interest method. You multiply the opening carrying value by the market yield at issue to get interest expense, compare it with the cash coupon paid, and the difference is the amount of discount or premium written off that period.
The second meaning describes repayment structure. An amortising bond repays a slice of principal with each payment, in the manner of a mortgage, so the outstanding balance falls steadily and the holder's exposure shrinks over time.
The nuance worth remembering is that both meanings reduce a nasty surprise at the end. Whether it is a discount being absorbed gradually or principal being repaid gradually, the point is to avoid a large uneven hit in the final period.
In practice
Real-world examples.
Example
A packaging manufacturer issues ten-year bonds at a discount because its coupon was set before rates moved. Its income statement shows interest expense noticeably above the cash coupon each year, which the investor relations team explains carefully in the annual results call.
Example
A housing association issues bonds that repay principal in equal instalments over 25 years. Investors accept a slightly lower yield because their capital returns steadily rather than sitting at risk until a single maturity date.
Example
An airline buys back its own discounted bonds early. Because the carrying value has only partly climbed towards face value, the buyback price is compared against carrying value to determine the gain or loss recorded on extinguishment.
Formula
Calculation
Interest expense = opening carrying value x effective interest rate; discount written off = interest expense - cash coupon
A company issues bonds with a face value of $500,000 carrying a 5% coupon, but because market yields are higher it raises only $460,000, creating a discount of $500,000 - $460,000 = $40,000. The effective market yield at issue is 6%. In the first year, interest expense is $460,000 x 0.06 = $27,600, while the cash coupon paid is $500,000 x 0.05 = $25,000. The discount written off is $27,600 - $25,000 = $2,600, so the carrying value rises to $460,000 + $2,600 = $462,600 and will continue climbing until it reaches $500,000 on the redemption date.Case study
Seen in the real world.
The following example is illustrative and fictional. Thornbury Rail Freight, an invented regional operator, issued $80 million of eight-year bonds at 94 cents on the dollar because its 4% coupon was below the yield investors demanded at the time. The company received $75.2 million and recorded a discount of $4.8 million.
For the first two years the finance team reported only the $3.2 million cash coupon as interest expense, which flattered the interest cover ratio used in its banking covenants. The auditors picked this up in year three and required the effective interest method to be applied retrospectively, adding roughly $560,000 a year of additional interest expense.
Restated interest cover fell from 3.4 times to 3.0 times, which was still inside the covenant but close enough to prompt a refinancing conversation with the lending bank. Thornbury's treasurer later described the episode as a reminder that cash paid and cost incurred are not the same number.
Watch out
Common mistakes.
- Equating the cash coupon with interest expense. On a bond issued at a discount or premium these two figures differ every single period.
- Using straight-line spreading by default. The effective interest method is generally required, and straight-line is only acceptable when the difference is immaterial.
- Confusing the two meanings of the word. One refers to spreading a discount or premium through the income statement, the other to repaying principal in instalments.
Questions
People also ask.
How does this affect reported profit?
Discount write-off increases interest expense and lowers profit, while premium write-off reduces interest expense and raises it.
Does the carrying value always end at face value?
Yes, if the bond is held to maturity, which is exactly why no gain or loss appears on redemption.
What happens on early repayment?
The redemption price is compared with the current carrying value and the difference is recorded as a gain or loss on extinguishment of debt.
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