A call provision decreases the bond's duration because a call provision introduces prepayment risk that should be factored in the calculation.
For the investor, one of the most significant risks of callable (or prepayable) bonds is that they can be called/retired prematurely. Because bonds are nearly always called for prepayment after interest rates have decreased significantly, the investor will find it nearly impossible to find comparable investment vehicles. Thus, investors have to replace their high-yielding bonds with much lower-yielding issues. From the bondholder’s perspective, a called bond means not only a disruption in cash flow but also a sharply reduced rate of return.
Generally speaking, the following conditions apply to callable bonds:
- The cash flows associated with callable bonds become unpredictable, since the life of the bond could be much shorter than its term to maturity, due to the call provision.
- The bondholder is exposed to the risk of investing the proceeds of the bond at lower interest rates after the bond is called. This is known as reinvestment risk.
- The potential for price appreciation is reduced, because the possibility of a call limits or caps the price of the bond near the call price if interest rates fall (also known as price compression).