Glossary term
Yield Spread
A yield spread is the difference between two yields, often used to compare a bond with a benchmark rate or another bond.
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What Is a Yield Spread?
A yield spread is the difference between two yields. In bond markets, it often compares the yield on one bond with the yield on a benchmark, such as a Treasury security, swap curve, or another bond with similar maturity. The spread is usually quoted in basis points, where 100 basis points equals 1 percentage point.
Yield spreads help separate the general level of interest rates from the extra compensation investors demand for credit risk, liquidity risk, structure, taxes, optionality, or market stress. A corporate bond yielding 5.25% when a comparable Treasury yields 4.00% has a 1.25 percentage point spread, or 125 basis points.
Key Takeaways
- A yield spread measures the gap between two yields.
- Bond spreads are commonly quoted in basis points.
- Wider spreads can signal higher perceived risk, weaker liquidity, or more compensation demanded by investors.
- Narrower spreads can signal stronger risk appetite or less compensation for taking risk.
- The benchmark matters; a spread to Treasuries, swaps, or another curve can tell different stories.
Basic Formula
The simplest spread calculation is:
Here, YieldA is the yield on the bond or asset being analyzed, and YieldB is the benchmark or comparison yield. If a bond yields 6.10% and the benchmark yields 4.70%, the spread is 1.40 percentage points, or 140 basis points.
What Spreads Can Signal
A spread is often a market price for uncertainty. Investment-grade corporate bonds usually trade at lower spreads than speculative-grade bonds because investors demand less extra compensation for default risk. Less liquid bonds may trade at wider spreads than more actively traded bonds. Callable or structured bonds may need spread analysis that accounts for embedded options.
Spreads can also move with the economic cycle. During periods of confidence, credit spreads often narrow because investors are willing to accept less compensation for risk. During recessions or funding stress, spreads can widen sharply as investors demand more yield or move toward safer assets.
Common Spread Types
Spread type | Comparison idea |
|---|---|
Credit spread | Corporate or risky bond yield versus a safer benchmark |
G-spread | Bond yield versus a government benchmark yield |
I-spread | Bond yield versus an interpolated benchmark curve rate |
Z-spread | Constant spread added to a spot curve to match a bond's price |
Reading the Benchmark
Yield spreads are only meaningful when the comparison is appropriate. Comparing a 10-year corporate bond with a 3-month Treasury bill mixes credit risk with maturity mismatch. Comparing a callable bond's yield with a noncallable benchmark may ignore the value of the call option. A spread can look attractive because the bond is cheap, but it can also look wide because the bond carries real risk.
Investors usually read spreads alongside duration, credit quality, call features, liquidity, tax treatment, and expected holding period. The spread is a starting point for risk compensation, not a full investment answer.
The Bottom Line
A yield spread is the gap between two yields. It is one of the core tools for reading bond risk and relative value, but its usefulness depends on choosing the right benchmark and understanding what risks the extra yield is meant to compensate.