Key Takeaways
- Remaining bond discount not yet amortized.
- Reduces bond carrying value on balance sheet.
- Amortization increases interest expense over time.
- Discount fully amortized by bond maturity.
What is Unamortized Bond Discount?
Unamortized bond discount is the remaining balance of a bond's original discount that has not yet been amortized as interest expense over the bond’s life. It arises when bonds are issued below their face value, reflecting the difference between the cash received and the bond’s par amount.
This discount is recorded as a contra-liability account, reducing the carrying value of bonds payable on the balance sheet until it is fully amortized by maturity.
Key Characteristics
The unamortized bond discount has distinct accounting and financial reporting features:
- Contra-liability account: It offsets the bonds payable balance, representing the unrecognized portion of the discount.
- Amortization impact: The discount is gradually amortized, increasing interest expense beyond coupon payments, aligning with GAAP principles.
- Effective interest rate: Amortization reflects the true cost of borrowing, often calculated using the effective-interest method.
- Balance sheet effect: The carrying value of the bond increases over time as the discount decreases, eventually matching face value at maturity.
- Financial statement link: Impacts both balance sheet and income statement by adjusting carrying amount and interest expense respectively.
How It Works
When a bond is issued at a discount, the initial proceeds are less than the face value, creating an unamortized bond discount that must be allocated over the bond’s term. This amortization increases reported interest expense gradually, ensuring your financial statements reflect the bond’s effective borrowing cost rather than just the coupon payments.
The amortization methods include the straight-line approach, which evenly spreads the discount, and the more accurate effective-interest method, which bases amortization on the bond’s carrying value and market interest rate. Using a T-account helps visualize the discount's reduction as interest expense is recognized.
Examples and Use Cases
Understanding unamortized bond discount is crucial for investors and companies managing debt instruments effectively:
- Airlines: Delta may issue bonds below par to reflect market conditions, creating unamortized discounts that impact their reported interest expense.
- Bond funds: Bond ETFs like those in best bond ETFs portfolios often hold bonds with unamortized discounts, affecting fund yields and valuations.
- Corporate bonds: Investors in BND, a broad bond fund, should understand how unamortized discounts influence net asset values and income distributions.
Important Considerations
When analyzing bonds with unamortized discounts, keep in mind that the amortization method can significantly affect reported interest expense and bond carrying values. The effective-interest method is preferred under GAAP for its accuracy, but some entities may opt for simpler approaches.
Additionally, unamortized discounts reveal the difference between coupon rates and prevailing market rates at issuance, helping you assess bond pricing and yield dynamics in your portfolio decisions.
Final Words
Unamortized bond discount reduces your bond’s carrying value and increases interest expense over time, reflecting the true borrowing cost. Review your amortization method and schedule regularly to ensure accurate financial reporting and cost assessment.
Frequently Asked Questions
Unamortized bond discount is the remaining portion of a bond's original discount that has not yet been expensed as interest over the bond’s life. It represents the difference between the bond's face value and the issuance price when sold below par.
Bonds have an unamortized discount when they are issued below their face value because the stated interest rate is lower than the market rate. This discount is gradually amortized over the bond’s term to reflect the true cost of borrowing.
On the balance sheet, the unamortized bond discount is recorded as a contra-liability account that reduces the carrying value of bonds payable. On the income statement, amortization of the discount increases interest expense beyond the cash interest paid.
The two common methods are the straight-line method, which evenly allocates the discount over the bond’s life, and the effective-interest method, which bases amortization on the bond’s carrying value and market rate. The effective-interest method is preferred under GAAP for accuracy.
Amortizing the bond discount increases reported interest expense because it adds a portion of the discount to the cash interest paid. This reflects the true borrowing cost by recognizing interest expense based on the effective interest rate.
At maturity, the unamortized bond discount is fully amortized to zero, and the bond’s carrying value equals its face value. The issuer repays the bond at par value regardless of the original issuance discount.
For example, if a $1,000 bond is issued at $950, there is a $50 discount. If $10 of this discount is amortized in the first year, the unamortized discount decreases to $40, and the carrying value increases from $950 to $960.

