Credit Spread

A credit spread is the extra return you demand for buying a company’s bond instead of a government bond. A Treasury yields 3%, a corporate bond yields 4.5%—the 150 basis point spread is your compensation for taking on credit risk. Spreads widen in stress (investors flee risky debt) and tighten in calm markets (investors reach for yield). Reading the spread is how you gauge the market’s fear.

How spreads work

A corporate bond yield is composed of two parts:

Risk-free rate. The yield on a U.S. Treasury of matching maturity. This reflects the time value of money and expected inflation, but no default risk.

Credit spread. The extra yield above the Treasury, compensating you for the risk that the company defaults.

For example, if a 5-year Treasury yields 2.5% and a 5-year investment-grade bond yields 3.65%, the credit spread is 115 basis points (3.65% − 2.5%).

The spread reflects:

• Default probability. Higher for junk-rated companies.
• Recovery in default. Worse for subordinated bonds, better for senior bonds.
• Liquidity. Less-traded bonds demand wider spreads.
• Market risk appetite. In panic, all spreads widen; in euphoria, they compress.

Investment-grade vs. high-yield spreads

Investment-grade bonds (AAA to BBB–) typically trade at 50–200 basis points over Treasuries. High-yield bonds (BB+ and below) trade at 300–1000+ basis points. The difference reflects dramatically different default probabilities and recovery expectations.

A BBB bond (lowest investment-grade) might spread at 150 bps, while a BB bond (highest junk) spreads at 350 bps. That 200 bp gap is the market saying: “BB bonds default 10x more often than BBB bonds, so you need significantly more yield.”

Spread widening and tightening

Credit spreads are dynamic. When market conditions deteriorate (earnings warnings, sector stress, macro downturn), investors demand higher spreads to hold corporate bonds. This is “spread widening”—the corporate yield rises faster than the Treasury yield, increasing the gap.

For example:

• Normal day: 5-year Treasury 2.5%, corporate 3.65%, spread 115 bps.
• Stress day: 5-year Treasury 2.3% (flight to safety), corporate 4.0% (de-risking), spread 170 bps.

The spread widens by 55 basis points in a day. In severe credit stress (2008, 2020, 2023 SVB crisis), spreads widen by 300–500 basis points.

The opposite happens in “risk-on” markets. Investors flood into credit, driving yields down faster than Treasuries fall, compressing spreads. In a sustained risk-on rally, spreads might compress to their “tightest” levels, signaling complacency.

What spreads tell you

Credit spreads are the market’s real-time price of credit risk. They’re forward-looking and responsive. A company whose credit rating is stable but whose bonds suddenly widen by 200 bps is sending a signal: the market thinks the company’s risk has risen, even if the rating agencies haven’t moved yet. Sophisticated investors watch spreads like a vital sign.

Conversely, a company rated junk whose spreads compress to 250 bps (tight for high-yield) signals market confidence in a recovery. The rating lags the spread; the spread is the leading indicator.

Spread duration and rate duration

When interest rates rise, both Treasury yields and corporate yields rise, but not symmetrically. The “rate duration” is your sensitivity to Treasury yields (same for all bonds of a given maturity). The “spread duration” is your sensitivity to credit spread changes. A bond with 5 years duration and 4 years spread duration means:

• A 1% rise in Treasury rates costs you roughly 5% of principal
• A 100 bp widening in credit spreads costs you roughly 4% of principal

In a risk-off shock (rates up, spreads wider), these effects compound. In a risk-on move (rates down, spreads tighter), they reinforce positively.

Sector spreads and name-specific spreads

Corporate bond spreads vary by industry. Utilities and highly-rated companies trade tight (75–125 bps for a large utility). Cyclical companies (autos, retailers) trade wider. Within a sector, individual company spreads vary based on company-specific credit metrics. A poorly-performing company might trade 200 bps wide, while a stable peer trades 100 bps.