Credit risk is the risk of loss because counterparties fail to meet all or part of their obligations. This risk type is normally the largest risk exposure for retail banks. Credit risk includes country risk and settlement risk.
- Country risk is the risk of losses arising from the economic or political circumstances in a country. Country risk also encompasses the risk of nationalisation, expropriation and debt restructuring.
- Settlement risk is the risk arising from with the settlement of payments for securities, derivatives and other trades when a bank remits payments before it can ascertain that the offsetting payments have been transferred to one of the bank's accounts.
The CRD acknowledges three methods for estimating credit risk:
- Standardised Approach
- Internal Rating Based, Foundation (IRB F or FIRB)
- Internal Rating Based, Advanced (IRB A or AIRB)
The three approaches are described below.
Standardised ApproachThe Standardised Approach was introduced in Basel I (1988), and includes four different risk classes: 0%, 20%, 50% and 100%. The CRD replaces all these risk classes with a more sensitive framework based on ratings from an external credit rating agency that is able to fulfil strict criteria. The result is a more comprehensive risk-weighting framework, with risk classes ranging from 0 to 1,250%.
For example of calculation see
FSA's homepage (59kb, PDF).
Internal Rating Based Approach - Foundation and AdvancedThere are two versions of the IRB Approach, the Foundation and the Advanced Approach. The IRB Foundation can be used from January 1, 2007, and the IRB Advanced can be used from January 1, 2008. The main difference is that the latter permits the use of more internal inputs.
Both models build on estimations of three important components:
- Probability of Default (PD), which is the probability that a borrower will default over a one-year period. The component is also known as "Expected Default Frequency" (EDF).
- Loss Given Default (LGD) expresses the expected share (%) of loss on an established facility with a borrower.
- Exposure at Default (EAD), or "Usage Given Default" (UGD), is the exposure at the time of default. Conversion Factor (CF) is included in the calculation of EAD.
These three parameters are multiplied together in order to calculate the Expected Loss (EL). The Expected Loss is combined with a maturity estimate and forms the basis for the required capital.
Read more about the PD, LGD, CF and EAD.