Credit Spreads – What They are and How They Work

Credit spreads are the difference in yield between any type of investment bond, and a US treasury of the same maturity.  Corporate bonds, which carry a risk of default, yield more than US Treasury Bonds, which carry no risk of default.  By looking at the difference in yield between a corporate bond and a Treasury of the same maturity, you can get an idea of the extra premium investors require for the extra credit risk inherent in the corporate bond.

If you are looking at a 10 year corporate bond which is yielding 5% for example, and at the same time the 10 Year treasury bond is yielding 2%, then the credit spread is 300 basis points (3%).


Treasuries are the Foundation of Bond Market Credit Spreads

Because US Treasuries are free of default risk, other bonds are compared to treasuries in order to get an idea of their credit risk.  When this article was written GE Capital Bonds with a 5 year maturity, were yielding 1.80%.  The equivalent US Treasury was yielding .61% so the credit spread was 119 basis points (1.19%).

The bonds of JCPenney (which is not in great financial shape) on the other hand, were yielding 8.3%.  As you can see the credit spread for JCPenney Bonds at 769 basis points is much “wider” than the spread for Exxon Mobile bonds at 119 basis points (a much “tighter” or “narrow” spread than JCPenny).

If you visited the trading floor of a major investment bank you would likely hear a bond trader say something like “Ford Sold 1.5 Billion 5 year bonds this week at T + 238”.  This means the yield that Ford is paying on these bonds is the yield on the 5 year treasury + 238 basis points (2.38%).  In other words bond traders look at the yield of a bond in terms of where it is trading vs. treasuries.  This gives them more context on how risky the market views Ford bonds than simply looking at the yield of the bond in isolation.


Charts of historical credit spreads

In addition to looking at credit spreads for individual bonds, investment account owners will also look at the credit spread of different categories of bonds.  For example, by comparing a group of corporate bonds (like investment grade corporate bonds)  vs. treasuries, you get a picture of where the average investment grade bond credit spread currently stands.

Luckily there are indexes available which make this comparison for you, so you do not have to calculate it yourself.  Two of the most popular are the:

  • BofA Merrill Lynch Corporate Master Option Adjusted Spread – represents the credit spread of the corporate bond market as a whole.
  • BofA Merrill Lynch High Yield Master II Option Adjusted Spread – Represents the credit spread of the high yield bond market as a whole.

You can find charts of both of these indexes as well as others here.


Interest rates change over time and so do credit spreads

Interest rate changes for different types of bonds do not normally occur in unison.  For example, when there is a lot of uncertainty in the market investors tend to park their money in super safe US Treasuries, causing the yield of US treasuries to drop.  The yields on high yield bonds on the other hand, tend to rise in times of uncertainty as investors shun risky assets.   So even though treasury yields are falling in this example, the credit spread is getting wider.

By looking at how the credit spread for a category of bonds is changing, you can get an idea of how “cheap” (wide credit spread) or “expensive” (tight credit spread) the market for those bonds is related to historical credit spreads.  Investors will also look at credit spreads for clues as to where the bond and other markets may be headed.  You can read more about how credit spreads change over time here.


Credit Spreads do not represent only credit risk

There is a common misconception that looking at credit spreads gives you a complete picture of the credit risk of one bond compared to another.  This is inaccurate, because there are other factors which combine with credit risk to make up the “spread premium” that other types of bonds have over treasuries.

For example, bonds with favorable tax treatment such as municipal bonds can actually trade at a yield which is below US Treasuries.  This is not because the market considers them less risky than US Treasuries, but because many municipal bonds are considered almost as safe as treasuries AND they have a big tax advantage over treasuries.  Similarly many corporate bonds are illiquid, meaning it can be difficult to sell the bond once you have bought it because there is not an active market for the bond.  Investors will therefore require a higher yield than would otherwise be the case for this bond, increasing its credit spread.

Here are a list of some of the other factors that can be included in the credit spread for different types of bonds in addition to credit risk:

For the definition and meaning of other bond related words visit the Learn Bond Glossary where we give explanation of many more terms.

This lesson is part of our Free Guide to the Basics of Investing in Bonds. Continue to the next lesson here.

All trading carries risk. Views expressed are those of the writers only. Past performance is no guarantee of future results. The opinions expressed in this Site do not constitute investment advice and independent financial advice should be sought where appropriate. This website is free for you to use but we may receive commission from the companies we feature on this site.
David Waring

David Waring was the founder of LearnBonds.com and has been a major contributor to the extensive library of investing news and information available on the site. Until the launch of Learnbonds.com in late 2011 there was no single site on the internet catering exclusively to the individual bond investor. This was true even though more individuals own stocks than bonds. Learn Bonds was launched to fill that gap.


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