A credit default swap (CDS) is a credit derivative in which a protection buyer pays agreed premiums and a protection seller promises a payment if a specified credit event occurs and the contract's settlement conditions are met. It lets an investor hedge or take exposure to a borrower's credit without buying or selling that borrower's debt.
The borrower whose credit is referenced is the reference entity. It is separate from the two CDS counterparties. Buying protection can reduce exposure to that borrower while creating exposure to the seller's ability to pay. The ESRB's account of CDS mechanics also explains why ownership of the underlying debt is not inherent to the contract structure; legal restrictions may still apply to particular uses.
Read the contract before reading the spread
Three specifications determine what the protection actually covers:
- Entity and obligations. The reference entity identifies the credit being transferred. A reference obligation helps identify the debt and contractual characteristics; obligations relevant to a trigger or eligible for delivery are governed by the documentation. Coverage need not be confined to the single bond an investor happens to hold.
- Covered credit events. Bankruptcy, failure to pay and restructuring are examples of credit events that may apply. Their definitions, thresholds, notices and any grace periods matter. A rating downgrade or falling bond price alone does not establish a covered event under an ordinary CDS.
- Settlement. Physical settlement involves delivery of eligible obligations for the contractual payment. Cash settlement uses the specified valuation mechanism. Auction settlement can supply a reference price where the terms provide for it; fallback rules matter if an auction does not occur.
These are contract choices, with conventions varying across markets. ISDA's disclosure annex, especially “Specification of Credit Events” and “Settlement Methods,” explains why identifying economic distress is only part of identifying a payment entitlement.
Two separate cashflow cases
Consider a wholly fictional single-name CDS with USD 10 million notional. The notional scales contractual payments; it is not an amount the buyer necessarily invests or transfers at inception.
Case A: a complete period without a covered event. Stipulate a running coupon of 100 basis points per year, equal to 1%, and an accrual fraction of . The buyer pays the seller
This is one period's premium. The fraction is stipulated for this example, rather than inferred from actual calendar dates. If an event occurs earlier, use the contract's event-period accrual and termination provisions; do not carry the full USD 25,000 into that different case automatically.
Case B: a covered event followed by cash settlement. Separately, stipulate that all required conditions are met and the contractual reference settlement price is 40% of par. The protection seller owes
The 40% is a settlement input. It need not equal the eventual recovery rate on the buyer's own bond. The USD 6 million is a protection payment, not net trading profit: premium, any upfront amount, funding and the investor's other positions require their own ledger.
Separate contractual scenarios, not a combined profit calculation. The issuer is referenced; the protection seller must perform. Event-period premium is outside this illustration.
Coupon, par spread and value answer different questions
The running coupon is the annual contractual rate used to calculate periodic premium amounts. The par spread is the running rate that would balance the valued protection and premium legs for the specified terms without an upfront balancing payment. Standardized contracts can keep the coupon fixed while an upfront payment adjusts for the difference from current market terms. Its direction depends on that difference.
A CDS can therefore change market value before any credit event. Valuation concerns the present value of remaining contingent cash flows, not the notional itself. The Federal Reserve primer, §§6–7, develops the mark-to-market and standardized-coupon distinctions. A quoted spread is also not simply a physical default probability: recovery assumptions, risk premia and market conditions enter its interpretation.
What the hedge leaves behind
Protection is only as useful as its coverage and performance. A mismatch in entity, seniority, maturity or deliverable obligations can leave basis risk against the debt being hedged. A solvent reference entity does not make the protection seller solvent; counterparty credit risk remains relevant, including when seller weakness coincides with the need for protection. Collateral and clearing arrangements change that exposure under their own terms.
For an application beyond the basic payment mechanism, CDS overlays in convertible arbitrage sizes a hedge by credit-spread sensitivity and examines documentation and recovery mismatches. The full lesson requires membership; its public preview is available without it.
Sources
- ISDA, Credit Derivatives Disclosure Annex, July 2021: specification of events and obligations; settlement methods and contractual conditions. ISDA-authored text hosted by Deutsche Bank.
- Antulio N. Bomfim, Credit Default Swaps, FEDS 2022-023: payment mechanics, valuation and standardized coupons/upfront payments, especially §§3, 6–7.
- ESRB, Credit default swaps — analysis and policies, November 2025, §2.1: counterparties, reference entities and synthetic credit exposure.
- John C. Hull, Options, Futures, and Other Derivatives, ninth Global Edition (Pearson, 2018), §25.1, pp. 594–597: local textbook grounding for CDS cash flows and settlement.