What a Credit Default Swap Actually Is
A credit default swap is an over-the-counter contract where one party pays periodic premiums to another in exchange for protection against a credit event on a reference entity. The protection buyer pays the premium. The protection seller pays out if the reference entity defaults, restructures, or experiences a similar credit event as defined in the contract. This is not insurance in the traditional sense. Insurance requires insurable interest. CDS contracts do not require you to own the underlying debt. The market trades on notional amounts. Standard sizes are $10 million, $50 million, or $100 million. Premiums are quoted in basis points per year. A 150 basis point spread on a $10 million notional means the buyer pays $150,000 annually, typically divided into four quarterly installments of approximately $37,500. The contract specifies the reference obligation, the seniority of the debt being referenced, the tenor, and the spread. Everything else follows from those terms.
Pricing Mechanics and the Recovery Rate Problem
CDS spreads reflect the market's estimate of default probability multiplied by the expected loss given default. Expected loss depends heavily on the recovery rate assumption. Recovery rates vary by issuer type, seniority, and jurisdiction. Senior secured debt recovers more than subordinated debt. Corporate issuers typically recover more than financial institutions in many historical periods. Structured finance tranches often have wildly different recovery assumptions than plain vanilla bonds. ISDA uses different recovery methodologies depending on the reference entity. For corporates, standard recovery rates are applied. For structured products, recovery can be modeled differently. I once modeled a portfolio of AAA CDO tranches using corporate recovery assumptions from ISDA historical data. When the actual defaults occurred in 2008 and 2009, those tranches recovered near zero. The model was off by more than 30 percentage points on recovery. The P&L impact from relying on incorrect recovery assumptions was substantial. Since then, I always cross-reference model output with actual auction results before making any trading decisions.
Unraveling The Mystery Of Credit Default Swaps A Beginners Complete Guide
The practical challenge in CDS is that spreads don't always move in line with what you'd expect from fundamental credit analysis. During calm periods, spreads compress to very low levels regardless of underlying credit quality. I managed a portfolio of BBB corporates in 2021 where CDS spreads were trading below 30 basis points for names with actual default probabilities estimated closer to 2 percent. The spread didn't reflect the fundamental risk. Relying solely on CDS spreads as a proxy for default probability is a mistake. Combine them with cash bond spreads, credit ratings, and actual financial analysis. When a credit event occurs, the protection buyer can choose between physical settlement and cash settlement. Physical settlement involves delivering the defaulted reference obligation to the protection seller in exchange for par value. Cash settlement uses an ISDA auction to determine the recovery price, and the seller pays the difference between par and the auction recovery value. Most modern CDS transactions use cash settlement. Physical settlement sounds straightforward but creates practical problems. I handled a trade where we needed to deliver bonds for physical settlement after a restructuring event. The bonds were severely illiquid. Finding enough sellers at reasonable prices took over two weeks. By the time we completed the delivery, the market had moved significantly against us. The cash settlement route would have resolved the same issue in days. Illiquidity of the reference obligation is a real risk that gets overlooked in textbook explanations.
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Documentation and Execution
CDS trades require an ISDA agreement between counterparties. The standard documentation is extensive. Getting an ISDA Master Agreement finalized typically takes a few days if both parties use standard terms. Custom provisions extend this considerably. I negotiated a cross-border CDS transaction for an emerging markets portfolio last year. Standard terms were settled in two days. Custom provisions around early termination rights and specific credit event definitions took three additional weeks. Legal fees on that transaction exceeded the expected profit from the trade itself. Execution happens through electronic platforms like Tradeweb or Greenlight, or via phone brokers. You specify the reference entity, seniority, notional, tenor, and spread. Liquidity varies dramatically by name. Investment grade sovereign and large corporate CDS trade tightly. Mid-cap corporates have wider spreads. Exotic references or subordinated tranches can have virtually no liquidity. Bid-ask spreads on illiquid names can exceed 100 basis points during normal conditions and widen to several hundred basis points during stress.
Basis Risk: The Hidden Problem
CDS spreads and cash bond spreads for the same reference entity and seniority do not move in perfect correlation. This divergence is called basis risk. During normal market conditions, the basis is usually small. During stress, it can become enormous. I experienced this during the March 2020 pandemic crash. CDS spreads on several investment grade names exploded by 200 to 300 basis points overnight. Cash bond spreads moved significantly less. The divergence was driven by funding constraints and collateral requirements that affected bond dealers differently than CDS dealers. Our hedging ratios became useless for several days. Basis risk exists because CDS and cash bond markets have different participant bases, different regulatory treatments, and different collateral requirements. CDS clearing through central counterparties after Dodd-Frank introduced margin requirements that don't apply to cash bond holdings. These structural differences cause persistent and sometimes large divergences between CDS and bond spreads.
Restructuring Events and Definition Changes
The definition of a restructuring credit event changed significantly after the 2009 ISDA amendments. Prior to these changes, certain bond exchange offers could trigger a credit event even without a payment default. The post-2009 rules require modifications to payment terms or consent solicitations to constitute a restructuring event. This matters enormously for CDS contracts issued before versus after the amendment date. I worked on a trade where we bought protection on a name that underwent a consent solicitation in 2014. The protection was on a contract governed by pre-2009 definitions. The restructuring qualified as a credit event under the old terms but might not have under new ones. Determining which definition applied required careful review of the specific contract language and the amendment date. A single misread sentence in the confirmation can mean the difference between a payout and nothing.
Liquidity Risk in Stress Situations
CDS markets can dry up extremely fast. I watched a mid-cap energy name go from a 50 basis point bid-ask spread to over 500 basis points within hours during the 2020 oil price collapse. Attempts to close positions during that window would have required accepting spreads that erased any remaining value. This isn't theoretical. It happened repeatedly across multiple names during that period. Always consider whether you can actually exit a CDS position when you need to, not just whether a quoted spread exists on the screen. Post-Dodd-Frank regulations require trade reporting for most CDS transactions and mandate central clearing for standardized CDS. Cleared CDS reduce counterparty risk but introduce initial and variation margin requirements that can tie up significant capital. For accounting purposes, CDS contracts are marked to market with changes flowing through earnings. This creates volatility in reported results that may not reflect the actual economic risk of your portfolio. Hedge accounting under ASC 815 or IFRS 9 can mitigate some of this but requires meeting strict effectiveness testing criteria. CDS are ineffective as early warning tools. Spreads react to news after it becomes public. By the time spreads move, the information is already incorporated into bond prices and other market indicators. Using CDS spreads to anticipate defaults is generally backwards. They confirm what you should already know from fundamental analysis, not predict it.
CDS also fail as perfect hedges for bond portfolios due to basis risk, recovery rate uncertainty, and liquidity mismatches. A CDS hedge on a bond position will never be exact. The hedge ratio needs frequent adjustment, and the residual basis risk can be material during stressed periods. If you're using CDS for hedging, expect imperfection and size your hedges accordingly. The market is also prone to structural imbalances. Protection sellers accumulate excessive short positions during calm periods because selling CDS is profitable when defaults are rare. When the cycle turns, unwinding those positions amplifies spreads beyond what fundamentals justify. This happened in 2008 and again in 2020. Understanding the structure of supply and demand in CDS markets is as important as understanding the contracts themselves.
