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Loss given default or LGD is the share of an asset that is lost if a borrower defaults. It is a common parameter in risk models and also a parameter used in the calculation of economic capital , expected loss or regulatory capital under Basel II for a banking institution .
The key variables for (credit) risk assessment are the probability of default (PD), the loss given default (LGD) and the exposure at default (EAD).The credit conversion factor calculates the amount of a free credit line and other off-balance-sheet transactions (with the exception of derivatives) to an EAD amount [2] and is an integral part in the European banking regulation since the Basel II ...
Estimate the risk parameters—probability of default (PD), loss given default (LGD), exposure at default (EAD), maturity (M)—that are inputs to risk-weight functions designed for each asset class to arrive at the total risk weighted assets (RWA) The regulatory capital for credit risk is then calculated as 8% of the total RWA under Basel II.
Credit default risk – The risk of loss arising from a debtor being unlikely to pay its loan obligations in full or the debtor is more than 90 days past due on any material credit obligation; default risk may impact all credit-sensitive transactions, including loans, securities and derivatives.
The risk of default is derived by analyzing the obligor's capacity to repay the debt in accordance with contractual terms. PD is generally associated with financial characteristics such as inadequate cash flow to service debt, declining revenues or operating margins, high leverage, declining or marginal liquidity, and the inability to ...
The exposure factor is usually a subjective value that the person assessing risk must define. It is represented in the impact of the risk over the asset, or percentage of asset lost. As an example, if the asset value is reduced two thirds, the exposure factor value is 0.66. If the asset is completely lost, the exposure factor is 1.0.
This value does not take account of guarantees, collateral or security (i.e. ignores Credit Risk Mitigation Techniques with the exception of on-balance sheet netting where the effect of netting is included in Exposure At Default). For on-balance sheet transactions, EAD is identical to the nominal amount of exposure.
Expected loss is not time-invariant, but rather needs to be recalculated when circumstances change. Sometimes both the probability of default and the loss given default can both rise, giving two reasons that the expected loss increases. For example, over a 20-year period only 5% of a certain class of homeowners default.