Credit Spread

A credit spread — or spread — is the difference in yield between a corporate bond (or other risky bond) and a Treasury security of the same maturity. A 10-year corporate bond yielding 4.2% and a 10-year Treasury yielding 3% have a 120-basis-point spread. The spread compensates investors for bearing credit risk — the risk that the corporation defaults.

How spreads work

A Treasury is risk-free (backed by the U.S. government). A corporate bond carries default risk. Investors demand extra yield to compensate for that risk.

The additional yield demanded is the credit spread. A 10-year AAA corporate bond might yield 50–100 basis points more than a 10-year Treasury. A 10-year B-rated junk bond might yield 500–800 basis points more.

The spread directly reflects the market’s assessment of default risk. A wider spread signals higher perceived default risk; a narrower spread signals lower perceived risk.

Spread changes and market sentiment

Credit spreads are highly cyclical:

Tight spreads (risk-on): In economic expansions, when default risk is low and investor risk appetite is high, spreads compress. BBB spreads might narrow to 200 basis points.

Wide spreads (risk-off): In recessions, when default risk is high and investor risk appetite is low, spreads widen. BBB spreads might exceed 600 basis points.

The 2008 financial crisis saw spreads explode — investment-grade spreads exceeded 600 basis points; high-yield spreads exceeded 2,000 basis points. Investors fled risk entirely, and corporate bonds crashed.

Investment-grade vs. high-yield spreads

Investment-grade spreads (investment-grade bonds rated BBB or higher) are tighter — typically 100–300 basis points. These are stable, profitable companies with low default risk.

High-yield spreads (high-yield bonds rated BB or lower) are much wider — typically 400–1,000+ basis points. These are leveraged companies with material default risk.

The spread differential compensates for the higher default probability and lower recovery rates in high-yield bonds.

Option-adjusted spread (OAS)

For bonds with embedded options (callable bonds, convertible bonds), the simple spread understates the credit risk because part of the spread compensates for the option rather than credit risk.

The option-adjusted spread (OAS) removes the option value to isolate the credit component. A callable bond might have 150 basis-point simple spread but only 100 basis-point OAS, with 50 basis points reflecting the call option.

Spread measurement and indices

Credit spreads are tracked by indices:

• Bloomberg Barclays Corporate Bond Index — Tracks investment-grade corporate spreads
• Bloomberg Barclays High-Yield Index — Tracks high-yield spreads
• ICE BofA — Publishes similar indices

These indices show daily changes in average spreads, helping investors gauge market sentiment and credit conditions.

Spread trading and pair trades

Bond traders exploit spread movements:

Tightening (spreads narrow): If you believe spreads will tighten (due to improving credit conditions), buy corporate bonds and short Treasuries. If spreads narrow as expected, you profit.

Widening (spreads widen): If you believe spreads will widen (due to deteriorating credit), short corporate bonds and buy Treasuries.

These pair trades isolate credit risk by neutralizing interest-rate risk.

Liquidity premium

Some of the spread is not pure credit risk but liquidity risk. Corporate bonds trade less liquid than Treasury securities. A small-cap company’s bonds might trade infrequently, requiring investors to accept a wider bid-ask spread.

This liquidity component of the spread typically represents 20–50 basis points for investment-grade bonds and up to 100+ basis points for less-liquid junk bonds.

Spread widening and losses

When credit spreads widen, bond prices fall. A corporate bond yielding 4% that widens to 5% (100 basis-point spread widening) loses value. If you bought at par, the market value falls.

This is why bondholders suffer losses in recessions and risk-off periods — not just from defaults, but from spread widening.

See also