Credit Spread
Credit spread is the yield or model-implied spread over a reference benchmark that reflects credit, liquidity, uncertainty, and bond-specific risks.
Select among nominal credit spread, G-spread, Z-spread, and option-adjusted spread based on benchmark curve, cash flows, and embedded options.
Benchmark spread measures express how much yield or model-implied spread a bond offers over a reference curve. The appropriate measure depends on whether the analysis needs one benchmark point, the full spot curve, or path-dependent option modeling.
| Situation | Preferred starting measure | Why |
|---|---|---|
| Quick plain-bond comparison | G-Spread | Compares yield with an interpolated government-curve point |
| Option-free bond with known cash flows | Z-Spread | Discounts every cash flow over the full spot curve |
| Callable, putable, or prepayable security | Option-Adjusted Spread | Models changing cash flows across rate paths |
| General market discussion | Credit Spread | Provides the umbrella concept and basic nominal calculation |
Record the benchmark source, curve type, currency, price and quote time, settlement, accrued interest, interpolation, day count, compounding, and model assumptions. A Treasury constant-maturity yield may be an interpolated par-curve point rather than the yield on one actual security, while a Z-spread requires a spot curve.
Spread can include expected credit loss, credit-risk premium, liquidity, structure, options, tax or regulatory effects, and technical flows. It does not isolate default risk by itself. A wide spread can indicate opportunity, severe risk, poor liquidity, a valuable embedded option, or some combination.
For distressed debt where promised maturity cash flows are no longer a realistic base case, move from yield-spread analysis to probability-weighted recovery amount and timing.
This section is educational only. Modeled precision does not remove benchmark, data, or model risk.
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Credit spread is the yield or model-implied spread over a reference benchmark that reflects credit, liquidity, uncertainty, and bond-specific risks.
G-spread is a bond's yield minus the interpolated government-curve yield at the same maturity; learn the formula, benchmark choices, and limitations.
Option-adjusted spread is the model-solved spread over benchmark rate paths after accounting for embedded calls, puts, or prepayment behavior.
Z-spread is the constant spread added to each benchmark spot rate so an option-free bond's discounted cash flows equal its market price.