The aim of this paper is to present the different proposals of the Basel Committee on Banking Supervision (BCBS) on the internal ratings-based (IRB) approach for credit risk and to find out about the effects that such measures may have on the financial sector as well as assessing if the measures are sufficient to reach the aspirations of the BCBS.
The remainder of this paper is organized as follows. The next section briefly describes the IRB approach under the Basel II accord and its current design. Section 3 discusses the reasons for the excessive variability in the regulatory capital requirements for credit risk. The focus of this paper is placed on section 4. It presents the different proposals concerning the IRB approach of the BCBS consolation document. Section 5 investigates the effects of the proposed measures of the BCBS. The final section summarizes the main conclusions.
Table of Contents
1 Introduction
2 IRB approaches for credit risk
3 Reasons for variation in credit RWA
4 Proposals of the BCBS to the IRB approaches for credit risk
4.1 Applicability of internal modelling
4.2 Parameter floors
4.3 Parameter estimation practices and fixed parameters
4.4 Output floors
5 Assessment of the consultation items
6 Conclusion
Objectives and Key Topics
This paper examines the proposals set forth by the Basel Committee on Banking Supervision (BCBS) in 2016 regarding revisions to the Internal Ratings-Based (IRB) approach for credit risk, aiming to assess whether these measures effectively reduce excessive variability in risk-weighted assets while maintaining risk sensitivity and financial stability.
- The role and functioning of the IRB approach under the Basel framework.
- Primary drivers for the observed variability in credit risk-weighted assets across banks.
- Specific BCBS proposals, including parameter floors, modelling restrictions, and output floors.
- An evaluation of the regulatory trade-offs between standardization, simplicity, and risk sensitivity.
Excerpt from the Book
4 Proposals of the BCBS to the IRB approaches for credit risk
The excessive variability in the capital requirements for credit risk in the IRB framework has compromised comparability. Some market participants have therefore questioned the reliability of the IRB approach. To restore the trust in IRB models the BCBS published the consultation document BCBS 362 which proposes several measures to reduce the variation in credit RWA calculated by the IRB approach. The key proposals are described below.
4.1 Applicability of internal modelling
One proposal to reduce the variation in credit RWA is to restrict the scope of use of internal models. The BCBS presents three different criteria which must be met before an asset class is suitable for internal modelling. First, appropriate data must be available for the respective risk, second, the banks have to use individual data which are unavailable for the broader market so that they are an information advantage for the individual bank and third, robust and universally accepted modelling techniques must be available for the validation of the exposures.
The use of IRB approaches should be completely removed for the category banks, which also contains other financial institutions, because in the view of the BCBS it does not fulfil the criteria for modellability. Furthermore, banks should no longer be allowed to use the IRB approaches for exposures to corporates and corporates belonging to consolidated groups with total assets greater than €50bn. The BCBS argues that for banks, other financial institutions and large coporates there are no sufficient data available to produce reliable PD estimations. The mentioned asset classes are usually considered to be low-default exposures which require a lot of observations of defaults for reliable PD estimations. However, defaults are too rarely observed due to their rare appereance. In addition, banks usually do not have any information advantage with regard to exposures to banks, other financial institutions and large corporates which are usually the subject of many market analysis and rated by rating agencies. Therefore, banks’ internal models create no added value compared to the SA.
Chapter Summaries
1 Introduction: This chapter outlines the motivation for the BCBS's 2016 consultation document, specifically the need to address excessive RWA variability and restore market confidence in capital ratios.
2 IRB approaches for credit risk: This section details the historical context of the IRB approach under Basel II and describes the fundamental methodologies banks use to calculate regulatory capital requirements.
3 Reasons for variation in credit RWA: This chapter analyzes the primary factors behind RWA heterogeneity, distinguishing between underlying risk-based differences and practice-based factors like modelling choices.
4 Proposals of the BCBS to the IRB approaches for credit risk: This central chapter explains the specific measures proposed by the BCBS, including tighter modelling scope, parameter floors, estimation practices, and new output floors.
5 Assessment of the consultation items: This section evaluates the proposed reforms, discussing the potential impact on risk sensitivity and whether they truly achieve the BCBS's goals of consistency and comparability.
6 Conclusion: This final chapter synthesizes the main arguments, suggesting that while the proposals standardize the framework, they risk reducing the efficacy of banks' risk management and failing to fully restore market confidence.
Keywords
Basel Committee, BCBS, IRB approach, Risk-weighted assets, RWA, Credit risk, Capital ratios, Parameter floors, Output floors, Internal models, Regulatory capital, Basel framework, Banking supervision, Financial sector, Model variability.
Frequently Asked Questions
What is the primary focus of this academic paper?
This paper focuses on the 2016 BCBS proposals aimed at revising the Internal Ratings-Based (IRB) approach for credit risk to reduce the variability of risk-weighted assets across banking institutions.
What are the core themes addressed in the research?
The core themes include the regulatory trade-offs between model sensitivity and standardization, the drivers of RWA calculation differences, and the potential unintended consequences of the proposed Basel reforms.
What is the main research objective of this study?
The objective is to present the BCBS's consultation proposals and critically assess whether these measures are sufficient to achieve the desired improvements in comparability without undermining risk sensitivity.
Which scientific methodology does the author apply?
The author conducts a qualitative policy analysis, reviewing the consultation document alongside academic literature and industry feedback to evaluate the effectiveness of the proposed regulatory changes.
What specific content is covered in the main body?
The main body details the current IRB structure, identifies why RWA varies significantly, explores specific proposals like parameter floors and output floors, and critically assesses these items against industry and supervisory objectives.
Which keywords best characterize this work?
Key terms include BCBS, IRB approach, risk-weighted assets, capital ratios, model variability, and regulatory consistency.
How do the proposed parameter floors impact risk-taking in banks?
The paper discusses that while floors reduce variability, they may also create perverse incentives, potentially encouraging banks to shift toward riskier assets to avoid being constrained by the parameter floors.
What is the author's conclusion regarding the BCBS proposals?
The author concludes that the proposals represent a significant shift that limits model flexibility, but warns that they provide only a limited contribution to restoring market confidence while potentially biasing RWA outcomes.
- Arbeit zitieren
- Anonym (Autor:in), 2017, Reducing the variation of credit risk-weighted assets, München, GRIN Verlag, https://www.grin.com/document/504593
