Credit Risk Versus Capital Requirements Under Basel Ii: Are SME Loans and Retail Credit Really Different?

29 Pages Posted: 18 Feb 2004

See all articles by Tor Jacobson

Tor Jacobson

Sveriges Riksbank - Research Division

Jesper Lindé

Sveriges Riksbank - Research Division

Kasper Roszbach

Norges Bank - Research Department; University of Groningen - Faculty of Economics and Business

Abstract

The new Basel II regulation contains a number of new regulatory features. Most importantly, internal ratings will be given a central role in the evaluation of bank loans' riskiness. Another novelty is that retail credit and SME loans will receive a special treatment in recognition of the fact that the riskiness of such exposure derives to a greater extent from idiosyncratic risk and much less from common factor risk. Much of the work done on the differences between the risk properties of retail, SME and corporate credit has been based on parameterized model of credit risk. In this paper we present new quantitative evidence on the implied credit loss distributions for two Swedish banks using a non-parametric Monte Carlo re-sampling method following Carey [1998]. Our results are based on a panel data set containing both loan and internal rating data from the banks' complete business loan portfolios over the period 1997-2000. We compute the credit loss distributions that each rating system implies and compare the required economic capital implied by these loss distributions with the regulatory capital under Basel II. By exploiting the fact that a subset of all businesses in the sample is rated by both banks, we can generate loss distributions for SME, retail and corporate credit portfolios with a constant risk profile. Our findings suggest that a special treatment for retail credit and SME loans may not be justified. We also investigate if any alternative definition of SME's and retail credit would warrant different risk weight functions for these types of exposure. Our results indicate that it may be difficult to find a simple risk weight function that can account for the differences in portfolio risk properties between banks and asset types.

Keywords: Internal ratings, credit risk, Value-at-Risk, banks, Basel II, retail credit, SME, risk weights

JEL Classification: C14, C15, G21, G28, G33

Suggested Citation

Jacobson, Tor and Linde, Jesper and Roszbach, Kasper F., Credit Risk Versus Capital Requirements Under Basel Ii: Are SME Loans and Retail Credit Really Different?. Journal of Financial Services Research, Forthcoming, Available at SSRN: https://ssrn.com/abstract=498882 or http://dx.doi.org/10.2139/ssrn.498882

Tor Jacobson

Sveriges Riksbank - Research Division ( email )

S-103 37 Stockholm
Sweden
+46 8 787 0000 (Phone)

HOME PAGE: www.riksbank.com

Jesper Linde

Sveriges Riksbank - Research Division ( email )

S-103 37 Stockholm
Sweden
+46 8 787 0873 (Phone)

HOME PAGE: http://www.riksbank.com

Kasper F. Roszbach (Contact Author)

Norges Bank - Research Department ( email )

P.O. Box 1179
Oslo, N-0107
Norway

University of Groningen - Faculty of Economics and Business ( email )

Department of Economics, Econometrics and Finance
Nettelbosje 2
Groningen, NL 9747 AE
Netherlands

HOME PAGE: http://www.rug.nl/staff/k.f.roszbach/

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