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Price-Yield Relationship

Spread Widening and Prices

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Spread Widening and Prices

Corporate bond yields are not determined by Treasury yields alone. A credit spread—the yield premium an issuer pays above Treasuries—widens or narrows based on perceived credit risk. When spreads widen, corporate bond prices fall even if Treasury yields are flat. This is a distinct source of loss that duration doesn't measure.

Key takeaways​

  • Credit spreads are the yield premium corporate bonds pay above Treasuries of equivalent maturity.
  • Spreads widen when credit risk increases (recession fears, issuer-specific problems, economic stress).
  • Spreads narrow when risk appetite improves (economic confidence, Fed easing, strong earnings).
  • Spread widening causes capital losses independent of Treasury yield changes.
  • Corporate bond duration captures only interest rate risk; spread risk is separate.

What Is a Credit Spread?​

On a given trading day in 2023, suppose:

  • 10-year Treasury yield: 4.2%
  • 10-year investment-grade corporate bond yield: 5.1%
  • Spread: 0.9% or 90 basis points

The corporate issuer pays 90 basis points above the Treasury because of default risk, illiquidity, and other credit-specific factors. If the Treasury yield is 4.2% and the spread is 90 basis points, the corporate yield must be 5.1%.

Spreads vary by credit quality:

  • High-quality corporates (AAA, AA rated): 30–50 basis points above Treasuries
  • Upper-medium quality (A, BBB rated): 80–150 basis points above Treasuries
  • High-yield (BB and below): 300–700 basis points above Treasuries
  • Distressed credits (CCC and below): 1,000+ basis points

These spreads are not fixed. They fluctuate constantly based on market conditions, and those fluctuations create gains and losses independent of Treasury rate changes.

Two Sources of Bond Price Change​

For a corporate bond, price changes come from two sources:

  1. Interest rate effect (captured by duration): When Treasury yields rise, all bonds lose value. A 10-year corporate bond with 8-year duration loses 8% when the 10-year Treasury yield rises 1%.

  2. Spread effect (not captured by duration): When the credit spread widens (increases), the bond's yield rises even if Treasury yields don't change, causing a price loss. When spread narrows (decreases), the bond's yield falls, causing a price gain.

Suppose a corporate bond has yield 5.1% (4.2% Treasury + 90 bps spread) and duration 8 years. It's currently trading at par (100). Now imagine:

Scenario A: Treasury yield rises to 5.2%, spread unchanged

  • New corporate yield: 5.2% + 0.9% = 6.1%
  • Price loss: approximately 8 × (6.1% − 5.1%) = 8 × 1% = −8%
  • New price: approximately 92

Scenario B: Treasury yield unchanged, spread widens to 150 bps

  • New corporate yield: 4.2% + 1.5% = 5.7%
  • Price loss: approximately 8 × (5.7% − 5.1%) = 8 × 0.6% = −4.8%
  • New price: approximately 95.2

Scenario C: Both happen simultaneously

  • New corporate yield: 5.2% + 1.5% = 6.7%
  • Price loss: approximately 8 × (6.7% − 5.1%) = 8 × 1.6% = −12.8%
  • New price: approximately 87.2

Scenario C illustrates why corporate bonds are riskier than Treasuries. They're exposed to two independent sources of loss: interest rates and credit spreads.

Historical Spread Movements​

2008 Financial Crisis: High-yield credit spreads blew out from 300 bps to 1,900+ bps within months. Corporates with stable revenues and investment-grade ratings saw spreads widen from 100 bps to 500+ bps. A bond investor holding 8-year duration corporate bonds faced 4% losses from Treasury rate changes and 3–4% additional losses from spread widening. Total loss: 7–8%, far exceeding the rate change alone.

2011–2012 European Debt Crisis: Spreads widened sharply for U.S. financial institutions and European exporters. Credit-sensitive sectors like banking and discretionary saw spreads blow out. Other sectors like utilities and consumer staples saw spreads widen less. A concentrated portfolio in financials would have suffered spread losses; a diversified portfolio would have been protected.

2020 COVID Crash: Spreads on investment-grade corporates widened from 100 bps to over 400 bps in a matter of weeks as businesses shut down and bankruptcy fears spiked. High-yield spreads exceeded 1,000 bps. By mid-year, as Fed emergency support became apparent, spreads compressed sharply, creating gains for investors who held through the panic. An investor who sold in March suffered; one who held was rewarded.

2022 Normalization: Spreads remained historically tight despite rising Treasury yields. Corporate earnings held up better than feared, unemployment stayed low, and Fed support prevented a financial crisis. While Treasury yields rose from 1.5% to 3.9%, spreads actually narrowed from 90 bps to 80 bps. This is unusual—spreads typically widen in rising-rate environments. But strong fundamentals prevented it. Investors in investment-grade corporates (LQD) underperformed Treasuries due to duration, but spread compression cushioned losses relative to the 2022 Treasury bear market.

Spread Duration vs Rate Duration​

Corporate bond investors should distinguish:

  • Rate duration: Sensitivity to Treasury yield changes. A 10-year corporate bond with rate duration 8 years loses 8% if Treasury yields rise 1%.

  • Spread duration: Sensitivity to spread changes. The same bond with spread duration 8 years loses 8% if spreads widen 1% (100 bps).

A bond's total duration ≈ rate duration + spread duration (approximately, ignoring convexity effects).

A corporate bond with rate duration 8 years and spread duration 8 years has total sensitivity of 16 years to a combined shock where Treasuries rise 1% and spreads widen 1%. But it only loses 8% if Treasuries rise 1% (with spreads stable) and loses 8% if spreads widen 1% (with Treasuries stable).

Professional managers track both metrics to understand total risk.

Spread Widening in Recessions​

Spreads reliably widen in recessions. The recession of 2001 saw investment-grade spreads widen from 100 bps to over 200 bps. The Great Recession saw them hit 600+ bps. The COVID downturn saw them spike to 400 bps briefly.

This creates a major risk for corporate bond investors: recessions hurt stocks first (drawdowns of 20–50%), then bonds suffer if spreads widen. The "diversification benefit" of bonds—that they're uncorrelated with stocks—fails precisely when you need it most.

Conversely, in expansions when equity valuations are high and earnings are strong, spreads compress and corporate bonds outperform Treasuries. The trade-off for higher yield is exactly this cyclical risk.

Spread Compression and Opportunity​

The flip side: when spreads are unusually wide (recession fears, credit event, market panic), investors who buy corporate bonds lock in high yields. If the feared event doesn't materialize, spreads compress, and investors get capital gains on top of coupon income.

This was true in March 2020. High-yield spreads hit 1,100 bps, offering 10%+ yields to maturity (yield-to-maturity on high-yield bonds; measured as expected annual return if held to maturity). Investors who bought then—or held and didn't panic-sell—captured enormous gains as spreads compressed back to 300 bps by year-end.

Similarly, in late 2011 during European fears, European bank bonds offered 8–10% yields for 5-year maturities. By 2015, as central banks stabilized conditions, those bonds had delivered 8–10% total returns. Risk was real, but compensation was adequate.

Hedging Spread Risk​

How do you protect against spread widening? Several strategies:

  1. Hold Treasuries only (SHV, VGSH, BIL): Eliminates spread risk but sacrifices yield. In 2022, Treasuries underperformed if your goal was total return, but they avoided spread risk (though not rate risk).

  2. Shorten duration (SHV, VGSH): Limits rate duration loss if spreads widen in a recession. But you sacrifice yield and potential spread compression gains.

  3. Hold high-quality corporates only (AAA, AA rated): These have narrower spreads and typically narrow less in recessions. LQD, for instance, has about 50% government/agency bonds, 50% investment-grade corporates. VWOB is similar.

  4. Diversify by sector: Utilities and consumer staples are defensive—their spreads widen less in recessions. Financials and discretionary are cyclical—their spreads widen more. A diversified portfolio blends both.

  5. Use options or CDS: Advanced investors hedge spread risk with credit default swaps or bond options, but this is beyond typical individual investors.

Spread Changes in Different Environments​

Next​

Credit spreads are one way corporate yields differ from Treasury yields. But even Treasury yields themselves contain multiple components—real rates, inflation expectations, and term premiums. Understanding these components reveals what's really changing when yields move and helps identify whether bonds are attractive or expensive.