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L.6 · ADVANCED · 3 MIN

Credit Default Swaps: Insurance on Bonds

A credit default swap (CDS) is insurance against a bond issuer defaulting. The buyer pays a periodic premium (the CDS spread, in basis points) and receives a payout if the reference entity defaults. CDS spreads are the market’s real-time assessment of credit risk.

Quiz · 5 questions ↓

Who pays and receives in a CDS

CDS FeatureDetail
Buyer paysCDS spread (e.g., 150 bps/year on notional)
Buyer receivesPar − recovery value if default occurs
Seller receivesPremium income
Seller paysThe loss if default occurs
No default neededCDS trades in secondary market based on spread changes

The CDS premium formula

Annual CDS Premium = Notional × CDS Spread (bps) / 10,000

Why CDS spreads beat rating grades

CDS spreads are often a better real-time indicator of credit risk than rating agency grades. When CDS spreads spike, the market is pricing in deteriorating creditworthiness — often before the rating agencies downgrade.

Watching spreads widen in credit stress

During major credit events, CDS spreads for affected companies spike from 100–200 bps to 1,000+ bps. Monitor financial news for CDS spread movements as an early warning of credit stress.

When spreads move before ratings

A company’s CDS spread widens from 80 bps to 350 bps over three months. The credit rating hasn’t changed. What’s the market telling you?

How CDS fueled the 2008 crisis

CDS played a central role in the 2008 financial crisis — AIG sold massive amounts of CDS protection on mortgage-backed securities without adequate reserves. Understanding CDS is essential for understanding systemic financial risk.

What buying CDS protection actually is

You own $10M of XYZ corporate bonds. XYZ CDS trades at 200bp (meaning cost of protection is 2%/yr). If you buy protection, what are you buying?

Reading CDS spreads as implied ratings

CDS SpreadImplied RatingMarket View
< 50 bpsAA/AAAVery low default risk
50–150 bpsA/BBBInvestment grade
150–400 bpsBB/BHigh yield territory
400–1000 bpsCCCDistressed
> 1000 bpsDefault likelyNear-default or restructuring expected

Estimating default probability from the spread

Fixed-income desks also read a CDS spread as a default-probability estimate: the approximate annual probability of default is the CDS spread divided by (1 minus the recovery rate). A 5-year CDS at 300 bps with an assumed 40% recovery implies roughly 300 / (1 - 0.40) = 5% default probability per year. Related read: the CDS-bond basis -- the CDS spread minus the cash-bond spread -- should theoretically sit near zero; when it turns significantly positive, CDS protection is expensive relative to bonds, a signal of market stress or technical dislocation.

Check your understanding

Sit with the ideas.

A company's CDS spread widens from 80 basis points to 350 basis points over three months, but its stock price has barely moved. What should an equity investor conclude?

Why:
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