Can Corporate Bond Prices Fall Even When Credit Spreads Narrow?
Separate corporate bond yields into benchmark government yields and credit spreads. Check basis points, option-adjusted spreads, and comparable maturities to distinguish improving credit from actual bond returns.
A credit spread shows the extra yield investors require on corporate and similar bonds over a benchmark bond. Even if the spread narrows, a larger rise in the benchmark government yield can raise the corporate bond’s overall yield and lower its price. Read the direction of credit risk separately from the direction of bond prices.
The additional yield reflects more than default probability
Corporate bondholders demand compensation for illiquidity and market uncertainty as well as the risk of missed principal and interest payments. A widening spread should therefore not be converted directly into a company’s default probability. Expected recovery rates, maturities, collateral, and subordination differ. Use Investor.gov’s explanation of corporate bonds to first examine the issuer’s payment capacity and contractual terms. Even with similar financial conditions, infrequently traded bonds can be priced differently from actively traded ones, so check actual trading activity and bid–ask spreads too.
Choose a benchmark in the same currency with a similar maturity
Subtracting a won-denominated government bond yield from a dollar corporate bond yield mixes currencies and interest rate environments. Align currency, remaining maturity, and interest rate structure first. Bonds with early-redemption options are difficult to compare using a simple yield difference alone. The ICE BofA option-adjusted spread available through FRED adjusts for option effects and should be distinguished from a spread calculated by simple subtraction. Such adjustments involve models and assumptions, and an index-wide average does not directly represent a specific company’s issuance terms.
Record spread changes and overall yield changes separately
Government bond yields can rise because of inflation or policy expectations even while improving corporate credit narrows spreads. When reviewing performance, record benchmark yield changes separately from spread changes and connect them to the interest rate sensitivity of the bonds held. Conversely, a corporate bond price increase driven by falling government yields can coexist with widening credit spreads that signal worsening corporate risk. Also note that these two yield changes do not fully explain total return, which includes interest received, default losses, and reinvestment results.
Worked example
Hypothetical example: A corporate bond has a required yield of 5.0%, consisting of a 3.0% benchmark government yield and a simple spread of 2.0 percentage points. If the government yield subsequently becomes 4.0% and the spread is 1.5 percentage points, the corporate yield is 5.5%. The spread has narrowed by 50 bp, but the overall yield has risen by 50 bp. With modified duration of 4 and other conditions unchanged, the small-yield-change price approximation is −4 × 0.005 = −2%. This approximation omits options and curvature.
What to check
- Have you aligned currencies and maturities in the spread comparison?
- Have you applied the fact that 100 bp equals 1 percentage point?
- Have you distinguished simple spreads from option-adjusted measures?
- Have you separated the price effects of government yield changes and credit changes?
Sources and primary materials
This is educational material about research methods. For an actual company decision, verify the filings and primary sources for the relevant period.