Counterparty Risk and CVA › Counterparty Risk and CVA

When you enter into a derivative contract with another party, you face a risk that goes beyond market movements: the risk that your counterparty might default before fulfilling their obligations. This counterparty credit risk became painfully apparent during the 2008 financial crisis when the collapse of Lehman Brothers left thousands of derivative counterparties with enormous unexpected losses. The event transformed how financial institutions think about and price derivatives, leading to a fundamental shift in valuation practices.

Credit Valuation Adjustment (CVA) emerged as the industry standard for quantifying this risk. Unlike traditional credit risk on loans where the exposure is the principal amount, derivative exposures fluctuate with market conditions and can swing from positive to negative over the contract's life. This creates a unique challenge: you need to project future exposure profiles, estimate default probabilities, and integrate these over time to arrive at a fair price for counterparty risk.

In this chapter, we develop the theoretical framework for measuring counterparty risk and calculating CVA. We build exposure profiles using simulation techniques from Part III, connect default probabilities to CDS spreads as covered in Chapter 13 of Part II, and implement practical CVA calculations. We also examine how CVA desks manage this risk and briefly introduce the broader family of valuation adjustments that modern derivatives pricing requires.