Credit Spread (Bonds)
A credit spread is the yield difference between a corporate or non-government bond and a comparable-maturity US Treasury, compensating investors for the additional credit risk of lending to a non-sovereign borrower.
Credit spreads are the primary mechanism through which the bond market prices default risk. When a five-year corporate bond yields 5.40% and a five-year Treasury yields 4.00%, the credit spread is 140 basis points (1.40 percentage points). That gap represents the market's collective judgment about the probability and severity of default, the liquidity of the bond in secondary markets, and any sector-specific risks.
Spreads vary significantly by credit quality. Investment-grade corporate bonds (rated BBB- or higher by S&P) have historically traded 50-200 basis points over Treasuries during calm markets, while high-yield bonds (rated BB+ and below) may trade 300-800 basis points over, and distressed credits can trade at spreads of 1,000 basis points or more. During periods of financial stress — such as the 2008-2009 financial crisis and the March 2020 COVID-19 shock — spreads can widen dramatically as investors demand higher compensation for perceived risk.
Credit spreads are tracked as an indicator of broader financial conditions. Tight spreads (low relative to historical averages) suggest investor confidence, ample liquidity, and a willingness to take on credit risk. Widening spreads signal growing concern about corporate health, potential defaults, or deteriorating economic conditions. The ICE BofA US Corporate Index Option-Adjusted Spread is one widely watched aggregate measure of US investment-grade corporate spreads.
Spread changes affect bond prices inversely. If a bond's spread widens by 50 basis points after issuance — meaning the market now demands more yield relative to Treasuries — the bond's price falls. For bonds with long durations, even moderate spread widening can cause substantial price declines. This is distinct from interest rate risk (which affects all bonds) and represents pure credit risk.
For equity investors, monitoring credit spreads can provide early warning signals. Spreads often widen ahead of recessions as credit markets tend to price risk faster than equity markets. A sustained widening of spreads across multiple sectors without an obvious single-company explanation is a signal worth monitoring alongside equity valuations.