A Credit Spread Is the Market Pricing the Chance You Do Not Get Repaid
Every corporate bond yields more than a government bond of the same maturity. That extra yield is a number with a job, and watching it move is a live read on risk appetite.
The Basic Comparison
A five year United States Treasury note yields whatever it yields. A five year bond from a corporate issuer yields more. The difference, quoted in basis points where one hundred basis points equals one percentage point, is the credit spread.
If the Treasury yields 3.0 percent and the corporate yields 4.6 percent, the spread is 160 basis points. The bond is offering that much extra to compensate for something the government bond does not carry.
What the Spread Is Paying For
Three things, in rough order of size.
Expected loss. Some issuers default, and holders recover only part of face value. If a category of bonds defaults at 2 percent a year and recovers 40 cents on the dollar, expected annual loss is around 120 basis points.
Risk premium. Defaults are not spread evenly. They cluster in recessions, precisely when investors can least afford them. Bearing a correlated risk requires payment above the expected loss.
Liquidity. Corporate bonds trade far less than Treasuries. Selling in size moves the price. That inconvenience carries a price too.
Historically only a minority of the investment grade spread has been explained by actual default losses. The rest pays for correlation and illiquidity, which is why spreads look generous in calm periods and insufficient in bad ones.
The Ratings Ladder
| Category | Typical spread | Character |
|---|---|---|
| AAA to AA | Very tight | Near government risk |
| BBB | Moderate | Lowest investment grade |
| BB to B | Wide | High yield, credit risk dominates |
| CCC and below | Very wide | Priced on recovery, not yield |
The jump from BBB to BB is the largest single step, because it crosses the line out of investment grade. Many institutions are mandated to hold only investment grade paper, so a downgrade across that boundary forces selling regardless of the analysis. That forced flow makes the boundary itself a source of price movement.
Spreads as a Signal
Spread levels track the economic cycle more reliably than most published indicators, because bondholders have asymmetric incentives. A bondholder receives a fixed return if things go well and takes losses if they go badly, so they focus on downside earlier than equity investors do.
Spreads widened well ahead of the 2008 recession while equities were still near highs. In March 2020 they gapped wider in days, then compressed rapidly once central bank support was announced.
The direction matters more than the level. Steadily widening spreads in a rising equity market is a disagreement between two groups of investors, and historically the bond market has been the one to trust.
Why Tight Spreads Are Not Comfort
A tight spread means the market sees little risk. It also means there is little cushion. When spreads are already at historically compressed levels, the potential gain from further tightening is small and the potential loss from widening is large.
This asymmetry is why credit is often described as picking up small returns in front of an occasional large loss. The strategy works for years and then does not.
The Duration Trap
Buying a corporate bond exposes you to two separate risks: the issuer's creditworthiness and the level of interest rates. A bond can perform badly because the company deteriorated or because rates rose, and those require different responses.
Investors who want only the credit exposure can hedge the rate component, isolating the spread. That is what a credit desk is usually trading, rather than the bond itself.
The Bottom Line
The credit spread is the extra yield a borrower pays over a government of equivalent maturity, and it compensates for expected default losses, the correlation of those losses with bad times, and illiquidity. Its movement is one of the cleanest available reads on risk appetite. Tight spreads mean confidence and thin compensation at the same time, which is exactly the condition that precedes the widening.