
Basel III: CET1, Tier 1, Tier 2, RWA & Capital Buffers
BFM Paper 2 (BFM Module D — Basel III Capital Adequacy, RWA & Pillar 1/2/3 Disclosures) — 3 Solved Case Sets & Interactive Calculator
Master every Basel III Capital Adequacy calculation for CAIIB BFM: RBI’s 9% Minimum CRAR + 2.5% Capital Conservation Buffer (11.5% Total), CET1/AT1/Tier 2 ceilings, converting Market & Operational Risk Capital Charge into RWA (multiplying by 12.5), and the Basic Indicator Approach (15% of positive Gross Income).
Core Formulas, RBI Benchmarks & Examiner Traps
| Concept / Metric | Exact Mathematical Formula | RBI Regulatory Norm / Benchmark | Common IIBF Examiner Trap |
|---|---|---|---|
| RBI Basel III Minimum Capital Ratios (India) | CET1 ≥ 5.5% | Additional Tier 1 (AT1) ≤ 1.5% (Min Tier 1 ≥ 7.0%) | Tier 2 ≤ 2.0% | Min CRAR = 9.0% + CCB 2.5% = 11.5% | RBI minimum CRAR is 9.0% (1% higher than BCBS international 8.0% norm); Total with CCB = 11.5% | Capital Conservation Buffer (CCB of 2.5%) must be met 100% out of Common Equity Tier 1 (CET1), making effective CET1 requirement 5.5% + 2.5% = 8.0%! |
| Converting Capital Charge to RWA (Market & Operational Risk) | Equivalent RWA = Capital Charge × 12.5 (per BCBS 8% reciprocal) OR Capital Charge × (100 / 9) = 11.11 (per RBI 9% reciprocal) | IIBF BFM standard convention uses Multiplier = 12.5 (1 / 0.08) unless 1 / 0.09 is explicitly stated in the question | Check the options carefully: always compute RWA using × 12.5 first (standard IIBF textbook method). |
| Operational Risk: Basic Indicator Approach (BIA) | KBIA = [∑ (GI_1 ... n × α)] / n, where α = 15% and n = number of years with POSITIVE Gross Income out of last 3 years | Years with negative or zero Gross Income are excluded from BOTH numerator and denominator! | If 1 of the last 3 years had negative Gross Income, divide the sum of the 2 positive years by 2 (NOT by 3)! |
| Basel III Leverage Ratio | Leverage Ratio = Tier 1 Capital / Total Exposure Measure (On-Balance Sheet + Derivative + SFT + Off-BS CCF) | Minimum 4.0% for Domestic Systemically Important Banks (D-SIBs: SBI, HDFC, ICICI) and 3.5% for other banks | Leverage Ratio uses Tier 1 Capital (CET1 + AT1), NOT Total Capital (Tier 1 + Tier 2), and uses non-risk-weighted Total Exposure. |
Basel III Capital Adequacy, CET1, CCB Shortfall & Dividend Distribution Constraints
Pragati Commercial Bank Ltd. (a scheduled commercial bank in India, non-D-SIB) reports the following capital components and Risk-Weighted Assets (RWA) as on 31st March 2026:
| Capital / RWA Component | Amount (₹ Crore) |
|---|---|
| Paid-up Equity Share Capital & Free Reserves (CET1 before deductions) | ₹7,200 Crore |
| Intangible Assets (Goodwill & Deferred Tax Assets deducted from CET1) | ₹400 Crore |
| Perpetual Debt Instruments (Additional Tier 1 — AT1 Eligible) | ₹1,400 Crore |
| Subordinated Debt & General Provisions (Tier 2 Eligible) | ₹2,000 Crore |
| Credit Risk RWA | ₹76,000 Crore |
| Market Risk RWA | ₹14,000 Crore |
| Operational Risk RWA | ₹10,000 Crore |
What is the Net Common Equity Tier 1 (CET1) Capital and the CET1 Ratio (%) of Pragati Commercial Bank?
Net CET1 = Gross CET1 - Regulatory Deductions (Goodwill/Intangibles/DTA); CET1 % = Net CET1 / Total RWA- Step 1: Net CET1 Capital = ₹7,200 Cr - ₹400 Cr (Intangibles/DTA) = ₹6,800 Crore.
- Step 2: Total RWA = Credit RWA (₹76,000 Cr) + Market RWA (₹14,000 Cr) + Operational RWA (₹10,000 Cr) = ₹1,00,000 Crore.
- Step 3: CET1 Ratio = (₹6,800 / ₹1,00,000) × 100 = 6.80%.
What is the Total Tier 1 Capital Ratio and Total CRAR (%) of the bank?
Tier 1 = Net CET1 + AT1; Total Capital = Tier 1 + Tier 2; Total CRAR = Total Capital / Total RWA- Step 1: Total Tier 1 Capital = Net CET1 (₹6,800 Cr) + AT1 (₹1,400 Cr) = ₹8,200 Crore -> Tier 1 Ratio = 8.20%.
- Step 2: Total Capital = Tier 1 (₹8,200 Cr) + Tier 2 (₹2,000 Cr) = ₹10,200 Crore.
- Step 3: Total CRAR = (₹10,200 / ₹1,00,000) × 100 = 10.20%.
As per RBI Basel III norms, the bank must maintain 5.5% Minimum CET1 + 2.5% Capital Conservation Buffer (CCB) = 8.0% CET1, and 11.5% Total CRAR (including CCB). What is the bank’s CET1 shortfall to fully meet the 2.5% CCB?
CET1 Shortfall (including CCB) = (8.0% Required CET1 - Actual CET1 %) × Total RWA- Step 1: Required CET1 including CCB = 5.5% (Min CET1) + 2.5% (CCB) = 8.0% of RWA = ₹8,000 Crore.
- Step 2: Actual Net CET1 = ₹6,800 Crore (6.80%).
- Step 3: CET1 Shortfall = ₹8,000 Cr - ₹6,800 Cr = ₹1,200 Crore (1.20% of RWA; available CCB is only 6.80% - 5.50% = 1.30%).
In addition to raising ₹1,200 Crore of CET1, how much additional Total Capital is required so that Total CRAR reaches the full 11.50% (9% + 2.5% CCB) regulatory requirement?
Total CRAR Shortfall = (11.50% - Actual CRAR %) × Total RWA- Step 1: Required Total Capital @ 11.50% of ₹1,00,000 Cr RWA = ₹11,500 Crore.
- Step 2: Existing Total Capital = ₹10,200 Crore (10.20%). Total Shortfall = ₹11,500 - ₹10,200 = ₹1,300 Crore.
- Step 3: Once ₹1,200 Crore of CET1 is raised, ₹100 Crore more (CET1 or AT1 up to 1.5% cap) is needed to reach ₹11,500 Crore.
If Pragati Commercial Bank has a Total Exposure Measure (On-Balance Sheet + Off-Balance Sheet Credit Equivalent) of ₹2,05,000 Crore, what is its Basel III Leverage Ratio, and does it comply with RBI norms for a non-D-SIB bank?
Basel III Leverage Ratio = Tier 1 Capital / Total Exposure Measure- Step 1: Tier 1 Capital = ₹8,200 Crore.
- Step 2: Total Exposure Measure = ₹2,05,000 Crore.
- Step 3: Leverage Ratio = (₹8,200 / ₹2,05,000) × 100 = 4.00%. Since 4.00% ≥ 3.50% (and even ≥ 4.00% D-SIB norm), it fully complies.
Standardized Credit RWA (Housing LTV, Sovereign, Retail, Corporate) & Operational Risk BIA
Calculate the Risk-Weighted Assets (RWA) and Capital Charge for Metro Bank from the following credit portfolio and 3-year Gross Income history:
| Asset Class / Operational Data | Exposure / Gross Income | Applicable Risk Weight / Parameter |
|---|---|---|
| Central Government G-Secs & Cash Balances with RBI | ₹5,000 Crore | 0% Risk Weight |
| State Government Guaranteed Advances (Standard) | ₹2,000 Crore | 20% Risk Weight |
| Regulatory Retail Portfolio (Qualifying SME & Personal) | ₹4,000 Crore | 75% Risk Weight |
| Standard Residential Housing Loans (Loan ≤ ₹30L, LTV ≤ 80%) | ₹3,000 Crore | 35% Risk Weight |
| Unrated Corporate Exposures (> ₹200 Cr banking exposure) | ₹2,000 Crore | 150% Risk Weight |
| Gross Income: FY24 = +₹1,400 Cr | FY25 = -₹300 Cr (Loss) | FY26 = +₹1,800 Cr | 3-Year History | BIA Alpha (α) = 15% |
What is the Credit Risk-Weighted Assets (RWA) for the Sovereign (Central + State Govt) and Regulatory Retail portfolios combined?
Credit RWA = ∑ (Exposure × Risk Weight %)- Step 1: Central Govt G-Secs & RBI Cash = ₹5,000 Cr × 0% = ₹0 Crore.
- Step 2: State Govt Guaranteed Advances = ₹2,000 Cr × 20% = ₹400 Crore.
- Step 3: Qualifying Regulatory Retail Portfolio = ₹4,000 Cr × 75% = ₹3,000 Crore.
- Step 4: Combined RWA = ₹0 + ₹400 + ₹3,000 = ₹3,400 Crore.
What is the Total Credit Risk-Weighted Assets (RWA) across all 5 asset classes listed in the table?
Total Credit RWA = Sovereign/Retail RWA + Housing RWA (35%) + Unrated Corporate RWA (150%)- Step 1: Sovereign + Regulatory Retail RWA = ₹3,400 Crore.
- Step 2: Residential Housing Loans (≤ ₹30L, LTV ≤ 80%) = ₹3,000 Cr × 35% = ₹1,050 Crore.
- Step 3: Unrated Corporate Exposures (> ₹200 Cr aggregate banking exposure) = ₹2,000 Cr × 150% = ₹3,000 Crore.
- Step 4: Total Credit RWA = ₹3,400 + ₹1,050 + ₹3,000 = ₹7,450 Crore.
Calculate the Operational Risk Capital Charge under the Basic Indicator Approach (BIA) from the 3-year Gross Income data (FY24: +₹1,400 Cr, FY25: -₹300 Cr, FY26: +₹1,800 Cr).
KBIA = 15% × Average of POSITIVE Annual Gross Income over last 3 years- Step 1: Exclude FY25 (-₹300 Cr negative Gross Income) from both numerator and denominator.
- Step 2: Average Positive Gross Income (FY24 & FY26) = (₹1,400 Cr + ₹1,800 Cr) / 2 = ₹1,600 Crore.
- Step 3: Operational Risk Capital Charge (KBIA) = 15% of ₹1,600 Crore = ₹240 Crore.
Convert the Operational Risk Capital Charge of ₹240 Crore into Equivalent Operational Risk RWA (using standard 12.5 multiplier).
Operational Risk RWA = Operational Risk Capital Charge × 12.5- Step 1: Operational Risk Capital Charge = ₹240 Crore.
- Step 2: Equivalent Operational Risk RWA = ₹240 Crore × 12.5 = ₹3,000 Crore.
If Market Risk Capital Charge is ₹160 Crore (Equivalent Market RWA = ₹160 × 12.5 = ₹2,000 Crore), what is the bank’s Total RWA (Credit + Market + Operational) and Minimum Required Capital @ 11.5% (including CCB)?
Total RWA = Credit RWA + Market RWA + Operational RWA; Required Capital = Total RWA × 11.5%- Step 1: Total RWA = ₹7,450 Cr (Credit) + ₹2,000 Cr (Market) + ₹3,000 Cr (Operational) = ₹12,450 Crore.
- Step 2: Required Capital @ 11.5% (9% CRAR + 2.5% CCB) = ₹12,450 × 0.115 = ₹1,431.75 Crore.
Off-Balance Sheet Credit Conversion Factors (CCF) & Credit Risk Mitigation (Haircuts)
A corporate borrower (Rated A, carrying 50% Risk Weight under Standardized Approach) has the following non-fund-based facilities and collateral with your bank:
| Facility / Collateral Detail | Amount / Parameter |
|---|---|
| Financial Guarantee (Bank Guarantee substituting financial obligation) | ₹200 Crore (CCF = 100%) |
| Performance Bank Guarantee (Bid Bond / Supply Performance) | ₹300 Crore (CCF = 50%) |
| Self-Liquidating Documentary Letter of Credit (LC for Merchandise) | ₹250 Crore (CCF = 20%) |
| Unconditionally Cancellable Undrawn Cash Credit Commitment | ₹400 Crore (CCF = 0%) |
| Cash Margin / Fixed Deposit Collateral (0% Haircut) against Financial BG | ₹40 Crore |
What is the Credit Equivalent Amount (CEA) before collateral deduction for the Financial Bank Guarantee (₹200 Cr) and Performance Bank Guarantee (₹300 Cr) combined?
CEA = Notional Off-Balance Sheet Principal × Credit Conversion Factor (CCF %)- Step 1: Financial Guarantee CEA = ₹200 Cr × 100% CCF = ₹200 Crore.
- Step 2: Performance Guarantee CEA = ₹300 Cr × 50% CCF = ₹150 Crore.
- Step 3: Combined CEA = ₹200 Cr + ₹150 Cr = ₹350 Crore.
What is the Credit Equivalent Amount (CEA) for the Documentary Merchandise LC (₹250 Cr) and Unconditionally Cancellable Undrawn CC Limit (₹400 Cr)?
Short-term Self-Liquidating Trade LC CCF = 20%; Unconditionally Cancellable Commitment CCF = 0%- Step 1: Self-liquidating Trade LC CEA = ₹250 Cr × 20% CCF = ₹50 Crore.
- Step 2: Unconditionally cancellable undrawn working capital commitment CEA = ₹400 Cr × 0% CCF = ₹0 Crore.
What is the Total Net Credit Exposure (E*) across all facilities after deducting the ₹40 Crore Cash Margin (0% haircut, same currency)?
Net Exposure (E*) = Total CEA - Eligible Financial Collateral after Haircut- Step 1: Total Gross CEA = ₹200 Cr (Fin BG) + ₹150 Cr (Perf BG) + ₹50 Cr (Trade LC) + ₹0 Cr = ₹400 Crore.
- Step 2: Less Cash/FD Margin in same currency (0% Haircut) = ₹40 Crore.
- Step 3: Net Credit Equivalent Exposure (E*) = ₹400 Cr - ₹40 Cr = ₹360 Crore.
Given the corporate borrower is externally rated "A" (50% Risk Weight), what is the Risk-Weighted Assets (RWA) and Minimum Capital Required @ 9% CRAR?
RWA = Net Exposure (E*) × Counterparty Risk Weight %; Min Capital = RWA × 9%- Step 1: RWA = ₹360 Crore × 50% Risk Weight = ₹180 Crore.
- Step 2: Minimum Capital @ 9% CRAR = ₹180 Crore × 9% = ₹16.20 Crore (or ₹20.70 Cr @ 11.5% with CCB).
If instead of Cash Margin, the borrower pledged ₹100 Crore of AAA Corporate Debt (Haircut Hc = 4%) in a mismatched currency (FX Haircut Hfx = 8%) against a ₹100 Crore exposure (He = 0%), what is the Adjusted Collateral Value?
Adjusted Collateral Value = C × (1 - Hc - Hfx)- Step 1: Under Basel III Comprehensive Approach formula: E* = max{0, [E × (1 + He) - C × (1 - Hc - Hfx)]}.
- Step 2: Adjusted Collateral Value = ₹100 Cr × (1 - 0.04 - 0.08) = ₹100 Cr × 0.88 = ₹88.00 Crore (or ₹88.32 Cr if multiplicative; Basel formula is additive: 1 - Hc - Hfx = 0.88 -> ₹88.00 Cr).
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Frequently Asked IIBF Exam Questions (BFM Paper 2)
What are the domestic corporate external rating risk weights under RBI Basel III Standardized Approach?
AAA = 20%, AA = 30%, A = 50%, BBB = 100%, BB & below = 150%, Unrated = 100% (or 150% if aggregate exposure from the banking system exceeds ₹200 Crore).
How does the Countercyclical Capital Buffer (CCCyB) work under Basel III?
CCCyB ranges from 0% to 2.5% of RWA (to be met with CET1) and is activated by RBI only when credit-to-GDP gap and supplementary indicators signal excessive systemic credit growth. Currently in India, CCCyB is maintained at 0%.

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