Bonds: A Look at Credit Ratings

Bonds are attractive to investors for two reasons. First, they offer a reliable source of income, paying interest on a regular basis until maturity (presuming the issuer remains solvent). Second, at maturity an investor receives back the full amount of principal that he or she has invested.

Bonds are perceived as a less risky investment than stocks. But that perception must be tempered by the fact that, because they may be bought and sold prior to maturity, bonds are subject to market fluctuation and may be worth less than the original cost upon redemption. The formula is simple: When interest rates rise, the value of existing bonds that pay below-market rates falls. If an investor needs to sell the bond in a rising interest rate environment, he or she may suffer a loss. On the other hand, falling interest rates may boost the value of an existing bond, often allowing an investor to sell the bond at a gain.

Bond quality

Because a wide variety of bonds is available to the average investor, those who want to keep their risk to a minimum—ensuring that their income stream remains predictable and that their principal is safe—should seek the guidance of credit rating agencies.

Standard & Poor’s and Moody’s are the two credit rating agencies most familiar to investors, as well as the most influential. Their role is to assess the risk of a bond under their scrutiny by studying all available information about the issuing company and then assigning a grade to the issue that accurately reflects the company’s ability to meet the promised principal and interest payments.

Standard & Poor’s and Moody’s both use letter grades to rate bonds. Although a bit different in letter usage, they both rate bonds in descending order from A to C. (See “How to Interpret Credit Ratings” below.)

A rating’s impact

A bond’s rating will have a strong influence on its pricing and interest rate. Of course, a credit rating is not a recommendation to buy, sell or hold a particular bond. Still, there is no denying the fact that a bond’s initial rating, as well as well as any subsequent upgrades or downgrades, will affect significantly the attractiveness of a bond to investors. (Upgrades and downgrades occur when the financial health of the issuer changes.)

As a result, ratings will affect a bond’s yield (the percentage return that investors can expect to receive on their bond holding). Highly rated bonds typically offer a lower yield just by the fact that they attract so many investors. Investors need an incentive to choose a lower-rated bond over a higher, and thus these bonds offer a higher yield.
Bonds generally are classified into two major categories—investment-grade and speculative (“high-yield” or “junk”) bonds. Investment-grade bonds are those that are assigned to the top four categories by Standard & Poor’s (AAA, AA, A, BBB) and Moody’s (Aaa, Aa, A, Baa).

What bond is best for you?

Why do you hold bonds in your investment portfolio? If you are like most bond investors, you are looking for predictability, safety and a source of cash in troubled times. You many also may hope for performance superior to stocks when stock prices are in decline.

If these are your aims, you need to limit your exposure to risk, by focusing on investment-grade issues. If you intend to hold more speculative issues, remember the rule of diversification—balance your low-grade holdings with investment-grade issues. Finally, for stability, consider shorter maturities, which fluctuate less with changes in prevailing interest rates.

How to Interpret Bond Credit Ratings
  Standard & Poor's Moody's  
Investment
Grade
AAA Aaa Extremely strong
AA Aa Very strong
A A Strong (somewhat susceptible to negative changes)
BBB Baa Adequate (susceptible to adverse conditions)
Speculative BB Ba Uncertain (presently adequate, but likely to encounter unfavorable conditions)
B B Somewhat vulnerable (currently adequate, but likely to encounter unfavorable conditions)
CCC Caa Vulnerable (payment dependent on favorable conditions)
CC Ca Highly vulnerable
C C Currently vulnerable (may be filing for bankruptcy, but currently paying)
D   In default (interest payment missed or bankruptcy declared)

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