We created a software package to valuate the Credit Value Adjustment (CVA) of a swap portfolio. Our client, active in banking and capital management in the Netherlands, wanted to evaluate its CVA position for the existing portfolio and see impact of new deals for a given counter party. The tool is specifically designed to consider the distribution of the exposure of a given counter party. This functionality allows for comparison between the regulatory value (BASEL III) and the economic value.
The tools was implemented on the Microsoft platform, using C#, Microsoft Visual Basic for Applications (VBA) and Excel.
In this blog we consider the hazard (or default) rate implied by Credit Default Swaps (CDS). In specific we compare a simplified CDS-spreads-based model against a bootstrap procedure. Surprisingly we find that the simplified approach works well in the current low-interest rate market. Our findings are based on a piecewise linear hazard rate curve. The nodes for these curves are obtained using either the simple model or the bootstrap approach.
A Credit Default Swaps (CDS) is a derivative to transfer default risk from one party to the next. The default protection is granted on the reference entity which can in principal be any entity, for example a single company, a group of companies or even a country. The protection buyer makes (quarterly) payments as compensation for the protection until either the end of the contract or the moment of default of the reference entity. This structure results in the pricing of this leg containing a part for the value of the payout in case of default and a part for the accrued premium until default. This side of the swap is called the premium leg.
The protection seller pays out a fixed amount in case of default of the reference entity. This amount is usually quoted as the notional amount times a recovery fraction. This side of the swap is called the protection leg.
To get a feel for the pricing of these kind of swaps please consider the simple attached example based on the book of Hull. In this example the CDS price is computed based on deterministic default probabilities and a fixed interest rate. To get a more realistic pricing, we could change the fixed interest rate with an interest rate model and the deterministic default probability with a stochastic model. However, that aside, we think this example gives a good basic understanding of how a CDS works.
The CDS example spreadsheet is available here : cds example