The risk that an investment's value will change due to a change in the absolute level of interest rates, in the spread between two rates, in the shape of the yield curve or in any other interest rate relationship. Such changes usually affect securities inversely and can be reduced by diversifying (investing in fixed-income securities with different durations) or hedging (e.g. through an interest rate swap). Interest rate risk affects the value of bonds more directly than stocks, and it is a major risk to all bondholders. As interest rates rise, bond prices fall and vice versa. The rationale is that as interest rates increase, the opportunity cost of holding a bond decreases since investors are able to realize greater yields by switching to other investments that reflect the higher interest rate. For example, a 5% bond is worth more if interest rates decrease since the bondholder receives a fixed rate of return relative to the market, which is offering a lower rate of return as a result of the decrease in rates.
Yield curve risk
The risk of experiencing an adverse shift in market interest rates associated with investing in a fixed income instrument. The risk is associated with either a flattening or steepening of the yield curve, which is a result of changing yields among comparable bonds with different maturities.
When market yields change, this will impact the price of a fixed-income instrument. When market interest rates, or yields, increase, the price of a bond will decrease and vice versa.
Call risk
The risk, faced by a holder of a callable bond, that a bond issuer will take advantage of the callable bond feature and redeem the issue prior to maturity. This means the bondholder will receive payment on the value of the bond and, in most cases, will be reinvesting in a less favorable environment (one with a lower interest rate). Typically, bond issuers will call a bond because of the high rate they are paying on the bond. If interest rates have declined since it first issued the bonds, issuers will often call the bond once it becomes callable and will create a new issue at a lower rate. The bondholders will then lose out on the high rate of their bond and will have to invest in a lower rate environment.
Prepayment risk
The risk associated with the early unscheduled return of principal on a fixed-income security. Some fixed-income securities, such as mortgage-backed securities, have embedded call options which may be exercised by the issuer, or in the case of a mortgage-backed security, the borrower.
The yield-to-maturity of such securities cannot be known for certain at the time of purchase since the cash flows are not known. When principal is returned early, future interest payments will not be paid on that part of the principal. If the bond was purchased at a premium (a price greater than 100) the bond's yield will be less than what was estimated at the time of purchase.