Amortized Bond

A bond with the principal amount is regularly paid down over the life of the bond

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What is an Amortized Bond?

An amortized bond is a bond with the principal amount – otherwise known as face value –regularly paid down over the life of the bond. The bond’s principal is divided up according to the security’s amortization schedule and paid off incrementally (often in one-month increments).

Amortized Bond


  • An amortized bond is a bond with a face value (or par) and interest that is paid down gradually until the bond reaches maturity; bond maturity may range up to 30 years.
  • Amortization is a helpful accounting tactic that is considerably beneficial to the company issuing the bond.
  • There are two methods through which amortization calculations are commonly performed – straight-line and effective-interest.

How an Amortized Bond Works

If the bond matures after 30 years, for example, then the bond’s face value plus the interest due is paid off in monthly installments. The bondholder essentially occupies the same type of position as a bank or other lender that extended a 30-year mortgage to a homebuyer – that is, they will receive regular payments of both principal and interest over the life of the bond, just as a mortgage lender receives regular payments over the term of a mortgage loan.

In most cases, the calculation for payments on an amortized bond is completed in such a way that each payment is the same amount. The only difference is the composition of the payment – the percentage of the payment going towards interest and the percentage of the payment going towards the principal varies, with more of the payment going towards interest early on and more going toward the principal as the bond gets closer to its maturation date.

Benefits of Amortized Bonds

A bond is a limited-life intangible asset. Amortizing a bond can be significantly beneficial for a company because the business can gradually cut down the bond’s cost value.

Accountants are able to respond to a bond as if it were an amortized asset. It essentially means that the entity issuing the bond gets to document the bond discount like an asset for the entirety of the bond’s life. It can only happen if the bond’s issuer is selling the bond at a discount, meaning the issuer lets the buyer purchase the bond for less than par, or face value.

Amortization is ultimately an accounting tactic that benefits an issuer when it comes time to filing taxes. An amortized bond’s discount is listed as a portion of the issuer’s interest expenses on its income statement. Interest expenses are non-operating costs and are crucial in helping a business to cut down on its earnings before tax (EBT) expenses.

Methods of Amortization: Straight-Line vs. Effective-Interest

The two most commonly used methods of amortization are :

1. Straight-Line: The simplest of the two amortization methods, the straight-line option results in bond discount amortization values, which are equal throughout the life of the bond.

2. Effective-Interest: The effective-interest method calculates different amortization amounts that must be applied to each interest expenditure per calculation period.

Amortization Methods

Example of Bond Amortization

For our example, let’s use a fixed-rate, 30-year mortgage, as it is one of the most common examples of amortization in action.

Assume that:

  • The value of the mortgage is $200,000.
  • There is a 5% fixed interest rate on the mortgage loan.

With the figures given above, the monthly payments are $1,073.64, which works out to be $12,883.68 per year. The majority of the payments early on are going toward interest. After the first year, even though payments total over $12,000, about $3,000 of the principal’s been paid off. By the end of the first year of payments, more than $197,000 of the loan’s principal amount remains.

Skip ahead a few years. At the end of your fifth year of payments, the monthly payment figure remains the same. However, the borrower’s paid off $16,342.54 of the principal balance. Still not much toward a total principal loan balance of $200,000 but making some progress in retiring the debt.

By the time the loan is preparing to reach maturity (around year 28 or 29), the majority of the yearly payments will go toward reducing the remaining principal. By the 29th year, roughly $11,000 of the annual payments of $12,883 are now going toward the principal rather than merely paying interest on the loan.

The best way to calculate an amortization schedule and amounts is to use an amortization calculator. These are widely available online and free to use from websites, such as Bankrate.

More Resources

CFI is the official provider of the global Commercial Banking & Credit Analyst (CBCA)™ certification program, designed to help anyone become a world-class financial analyst. To keep advancing your career, the additional CFI resources below will be useful:

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