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Credit Default Swap: How CDS Transfers Default Risk
A credit default swap is a contract in which one party pays a periodic premium to a second party, who agrees to compensate the first if a specified borrower defaults. It is the most traded credit derivative in the world.
Key Takeaways
- A CDS is economic insurance on a bond: the protection buyer pays a quarterly premium and receives (1 minus auction recovery price) times notional if a credit event occurs.
- Lehman Brothers settled at approximately 8.6 cents on the dollar in 2008's ISDA auction, meaning buyers of Lehman CDS received roughly 91.4% of notional as a payout.
- Treating recovery as zero is the most common CDS modeling error; senior unsecured corporates historically recover around 40 cents on the dollar, significantly reducing the expected payout.
- Post-2009 Big Bang Protocol standardized North American CDS to a fixed coupon of 100 or 500 basis points, enabling central clearing and eliminating the bespoke coupons that made earlier contracts hard to net.
Key Takeaways
- A CDS is economic insurance on a bond: the protection buyer pays a quarterly premium and receives (1 minus auction recovery price) times notional if a credit event occurs.
- Lehman Brothers settled at approximately 8.6 cents on the dollar in 2008's ISDA auction, meaning buyers of Lehman CDS received roughly 91.4% of notional as a payout.
- Treating recovery as zero is the most common CDS modeling error; senior unsecured corporates historically recover around 40 cents on the dollar, significantly reducing the expected payout.
- Post-2009 Big Bang Protocol standardized North American CDS to a fixed coupon of 100 or 500 basis points, enabling central clearing and eliminating the bespoke coupons that made earlier contracts hard to net.
What It Is
A CDS is, in essence, insurance on a bond or loan. The protection buyer pays a quarterly fee, quoted in basis points on the notional amount. The protection seller pockets the premium in exchange for agreeing to pay out if a predefined credit event occurs on the reference entity.
If a credit event happens, the contract is settled. The seller pays the buyer an amount equal to par minus the recovery value of the defaulted obligation. Recovery is not assumed, it is determined by an ISDA-run auction.
CDS contracts are governed by ISDA Master Agreements and standardized Credit Derivatives Definitions, which spell out exactly what counts as a credit event and how settlement works.
The Intuition
A bank that holds a corporate bond has credit risk on the issuer. One way to offload that risk is to sell the bond. Another, more flexible way is to buy CDS protection. The bank keeps the bond, keeps the coupons, and pays a premium to a counterparty who agrees to make them whole if the issuer fails.
The market also includes participants with no bond exposure at all. A hedge fund that thinks an issuer will weaken can buy CDS protection as a pure short on credit. That flexibility, isolating credit risk from funding and interest-rate risk, is why the CDS market grew from a niche bank product in the 1990s into a multi-trillion-dollar market used by insurers, pension funds, hedge funds and central clearing houses.
How It Works
The ISDA credit events most commonly referenced are:
- Bankruptcy of the reference entity.
- Failure to pay on direct or guaranteed debt above a threshold.
- Restructuring in certain forms (Full, Mod-R, Mod-Mod-R, or No-R) that reduces economic value to creditors.
When a credit event is confirmed, an ISDA Credit Derivatives Determinations Committee calls an auction. Dealers submit bids and offers for the defaulted reference obligations. The auction produces a final price, and the protection buyer receives (100 minus final price) times the notional.
CDS payout = notional * (1 - Auction Final Price)
Recovery rates vary. Senior unsecured corporate debt historically settles around 40 percent, but individual events have ranged from near zero to above 90 percent. Lehman Brothers settled near 8.6 percent in 2008. The auction mechanism replaced the older physical-delivery process, where buyers had to hunt for the cheapest deliverable bond.
Post-2009, standard North American CDS contracts trade with a fixed coupon of 100 basis points (investment grade) or 500 basis points (high yield), with the economic difference from the market spread paid as an upfront amount at trade date. This change, part of the Big Bang Protocol, was designed to allow central clearing.
Worked Example
A pension fund owns $10 million of bonds issued by Corporation X. It buys 5-year CDS protection quoted at a par spread of 200 basis points on $10 million notional.
Premium: 2.00% * $10M = $200,000 per year, paid quarterly at $50,000.
Three years in, Corporation X files for bankruptcy. The ISDA auction determines the final price of the cheapest deliverable senior unsecured bond at 35.
Protection payout: (1 - 0.35) * $10M = $6.5M.
The pension fund has paid 3 years of premium, $600,000, and receives $6.5M. Its net recovery is $6.5M plus whatever it realizes from the bonds themselves. Without the CDS, it would have been left with only the recovery value of the bonds.
Common Mistakes
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Treating recovery as zero. A defaulted senior unsecured bond usually recovers something, often around 40 percent for corporates. Modeling a CDS payoff as full notional in a default materially overstates both expected protection and implied default probability.
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Confusing the CDS spread with an interest-rate spread. A CDS spread is the premium for credit risk only, quoted in bp per year on notional. A bond's credit spread over Treasuries embeds liquidity, convexity, and funding differences in addition to default risk. The two are related but not equal, and the difference is called the CDS-bond basis.
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Ignoring auction settlement mechanics. Under the Big Bang Protocol, the recovery price is set by an ISDA-run auction, not by individual negotiation. Traders who assume they can physically deliver any eligible bond are working from a pre-2009 rulebook.
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Treating a CDS buy as pure hedging. If you hold no underlying bond, owning CDS protection is a short position on the issuer's credit. That is legitimate, but it is speculation rather than insurance. Regulators and tax authorities treat "naked" CDS positions differently in several jurisdictions, notably under the EU short-selling regulation for sovereign CDS.
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Misunderstanding cheapest-to-deliver. Historically, protection buyers could choose which qualifying bond to deliver into a default, picking the one with the lowest price. That created value for buyers and dispute for sellers. Auctions mostly eliminated the problem, but bespoke trades and loan-only CDS still retain cheapest-to-deliver dynamics that need careful attention.
Frequently Asked Questions
Q: What is a credit default swap in simple terms? A CDS is effectively bond insurance. The protection buyer pays a quarterly fee based on the notional amount, and the protection seller agrees to pay out (par minus recovery value) if the reference company defaults. The buyer keeps the bond and its coupons; the CDS provides the credit hedge.
Q: How does a credit default swap affect investment decisions? CDS lets investors separate credit risk from interest-rate risk. A bank holding a corporate bond can buy CDS protection to eliminate default exposure while keeping the bond's yield and duration characteristics. Hedge funds can short credit by buying CDS without needing to borrow and sell bonds.
Q: What is a real-world example of a credit default swap? A pension fund owns $10 million of a corporate bond and buys 5-year CDS protection at 200bp, $200,000 per year in premiums. Three years and $600,000 in premiums later, the company files for bankruptcy. The ISDA auction sets recovery at 35%, and the fund receives $6.5 million, a net recovery of $5.9 million above what it paid in premiums.
Q: How can investors use credit default swaps in a portfolio? Institutional investors use single-name CDS to express issuer-specific credit views without trading the bonds, hedge concentrated credit exposure in loan books, and gain or reduce credit beta efficiently. CDS indexes (CDX, iTraxx) allow one-ticket access to broad investment-grade or high-yield credit risk.
Q: How is a credit default swap different from a corporate bond? A corporate bond requires full purchase price and earns coupon income. A CDS is a derivative that transfers credit risk without owning the underlying bond, the premium is much smaller than the notional, making CDS highly leveraged. Bonds include interest-rate risk and liquidity risk in addition to credit risk; CDS isolates credit risk more cleanly.
Sources
- ISDA. "Single-Name Credit Default Swaps: A Review of the Empirical Academic Literature." Culp, van der Merwe, Staerkle. https://www.isda.org/a/KSiDE/single-name-cds-literature-review-culp-van-der-merwe-staerkle-isda.pdf
- IOSCO. "The Credit Default Swap Market Report." https://www.iosco.org/library/pubdocs/pdf/ioscopd385.pdf
- FDIC. "Restructuring Risk in Credit Default Swaps: An Empirical Analysis." Berndt, Jarrow, Kang. https://www.fdic.gov/analysis/cfr/2006/apr/berndt-jarrow-kang.pdf
- ISDA. "The Credit Event Process." https://www.isda.org/a/cKwEE/TheCreditEventProcess.pdf
Disclaimer
This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.