Yield-curve version built from hypothetical par bonds, used to compare coupon-bearing benchmarks across maturities.
A par yield curve shows the yields of hypothetical bonds that trade at par across different maturities. Each point on the curve represents a bond whose coupon rate equals its yield, so the bond price is roughly 100 on a face-value basis.
The par yield curve matters because many benchmark government issues are coupon-paying bonds rather than zero-coupon bonds. That makes the par curve a more intuitive bridge between raw market instruments and the underlying yield curve.
It is useful for:
| Measure | What it shows | Best use | Main limitation |
|---|---|---|---|
| Yield Curve | General maturity structure of yields | Macro and benchmark-rate discussion | Can blur how the curve is actually built |
| Par Yield Curve | Yields on hypothetical par coupon bonds | Market convention and benchmark comparison | Not a direct discount curve for each cash flow |
| Spot Rate | Discount rate for one exact maturity point or prompt settlement context | Zero-coupon discounting or prompt market price | The singular term is broader and can refer to FX or commodity settlement too |
Par curves are usually derived from market prices, coupon structures, and curve-building assumptions. Analysts often use the par curve as a presentation-friendly benchmark, while valuation models rely more directly on spot rates and discount factors underneath it.
Suppose the 5-year par yield is 4.10%. That means a hypothetical 5-year bond paying a 4.10% coupon would trade near par if priced from that curve.
A spot rate discounts one maturity point directly. A par yield reflects a coupon-paying bond that has cash flows before maturity.
For detailed bond valuation and spread work, analysts often move from the par curve to spot rates, forward rates, or discount-factor curves.