Three Pillars of Basel III and Credit Risk: PD, LGD, EAD Guide

The three pillars of Basel III are the architecture on which modern bank capital regulation rests. Developed by the Basel Committee on Banking Supervision after the 2008 global financial crisis and implemented in India by the RBI. Basel III strengthens the quantity and quality of bank capital, improves risk coverage, and adds liquidity and leverage safeguards. For IIBF risk management candidates. Understanding the three pillars of Basel III, together with the credit risk parameters PD, LGD and EAD, is central to both the exam and sound banking practice.

This article unpacks each pillar, the Basel III capital stack, and the building blocks of credit risk that feed into expected loss and capital calculations.

Pillar 1: Minimum capital requirements

The first of the three pillars of Basel III sets the minimum capital a bank must hold against its risk-weighted assets (RWA). Covering credit risk, market risk and operational risk. The headline ratio is a minimum total Capital to Risk-weighted Assets Ratio (CRAR) of 8% under Basel norms. Which the RBI has set higher at 9% for Indian banks, plus buffers.

Basel III sharpened the quality of capital by emphasising Common Equity Tier 1 (CET1), the most loss-absorbing form. Banks must hold CET1 of at least 5.5% of RWA in India, Tier 1 of at least 7%, and total capital of 9%, over and above a Capital Conservation Buffer of 2.5% in CET1. Risk-weighted assets are computed by assigning risk weights to exposures, so a sovereign exposure carries a low weight while an unrated corporate carries a higher one. Pillar 1 therefore links the riskiness of a bank's book directly to the capital it must carry. Current regulatory ratios are tracked on the RBI rates resource page.

Pillar 2: Supervisory review process

The second pillar recognises that Pillar 1 cannot capture every risk. The Supervisory Review and Evaluation Process (SREP) requires banks to run an Internal Capital Adequacy Assessment Process (ICAAP) in which they identify and quantify risks not fully covered in Pillar 1. Such as concentration risk, interest rate risk in the banking book, liquidity risk and reputational risk. The bank then determines the capital it needs for its specific risk profile.

Supervisors, in turn, review the bank's ICAAP, assess its risk management and governance, and may require additional capital or corrective action where they judge it necessary. This pillar is qualitative and judgement-driven, complementing the formulaic Pillar 1. Within the three pillars of Basel III, Pillar 2 is where stress testing, risk appetite frameworks and board oversight come together. Strong governance and a credible ICAAP are exactly what supervisors look for. Candidates can deepen this through the structured CAIIB course and validate learning with focused mock tests.

Pillar 3: Market discipline

The third of the three pillars of Basel III harnesses market discipline through disclosure. Banks must publish detailed. Standardised information on their capital adequacy, risk exposures, risk assessment processes and capital structure so that investors, depositors and counterparties can evaluate the bank's risk profile. Transparency creates incentives for prudent behaviour, because a bank that takes excessive risk faces a higher cost of funds and sharper market scrutiny.

Pillar 3 disclosures include the composition of regulatory capital, the CRAR, leverage ratio, liquidity coverage ratio and the breakdown of credit, market and operational risk. By complementing the regulatory minimum (Pillar 1) and supervisory oversight (Pillar 2) with public accountability, market discipline closes the loop. The Basel framework's authoritative texts and the RBI's implementation guidance are available at rbi.org.in, and you can follow regulatory updates on the IIBF news page.

Credit risk: PD, LGD and EAD

Credit risk, the risk that a borrower fails to repay, is the largest risk most banks face and the dominant driver of Pillar 1 capital. Under the Internal Ratings-Based (IRB) approaches that Basel permits, credit risk is decomposed into three parameters. Probability of Default (PD) is the likelihood that a borrower will default over a one-year horizon, expressed as a percentage. Loss Given Default (LGD) is the proportion of the exposure the bank expects to lose if default occurs, after accounting for collateral and recovery. Exposure at Default (EAD) is the amount outstanding the bank is exposed to at the moment of default.

These combine into the classic formula for Expected Loss (EL) = PD × LGD × EAD. Expected loss is covered by provisions, while unexpected loss is covered by capital. A bank with better risk selection (low PD), strong collateral (low LGD) and disciplined limits (controlled EAD) needs less capital and earns more reliably. Mastering how these parameters interlock is the heart of the three pillars of Basel III credit-risk syllabus. Reinforce the relationship with the concept-matching drill on the match game and read worked examples on the iibf.store blog.

Liquidity and leverage add-ons

Beyond the three pillars, Basel III added two macroprudential safeguards worth knowing. The Leverage Ratio caps a bank's Tier 1 capital relative to its total exposure, acting as a non-risk-based backstop against excessive balance-sheet growth. The Liquidity Coverage Ratio (LCR) requires banks to hold enough high-quality liquid assets to survive a 30-day stress.

And the Net Stable Funding Ratio (NSFR) promotes stable funding over a one-year horizon. These additions address weaknesses the crisis exposed that pure capital rules could not fix. A bank could be well capitalised yet fail if it could not roll over short-term funding.

Which is precisely what the LCR and NSFR guard against. For the exam. Remember that the leverage ratio is deliberately non-risk-based so that it catches risk that internal models might understate, acting as a simple, hard floor that complements the risk-weighted ratios of Pillar 1.

Conclusion

The three pillars of Basel III, minimum capital, supervisory review and market discipline, supported by PD, LGD and EAD-based credit risk measurement, define how resilient banks are built. Command the pillars, the capital stack and the expected-loss formula, and you will tackle a high-weight slice of the IIBF risk management syllabus with confidence. Test your readiness now with the full question bank at iibf.store/tests.