RegTech Codex Briefing #1: Basel III Endgame Encyclopedia: CET1 Capital Stack, 72.5% RWA Output Floor, LCR & NSFR Mechanics
Definitive statutory reference for Basel III capital adequacy tiers (CET1, AT1, Tier 2), High-Quality Liquid Assets (HQLA) haircuts, and Net Stable Funding Ratio (NSFR) weights.
Key Institutional Takeaways
- Total regulatory capital comprises CET1 (≥4.5% minimum), Additional Tier 1 CoCo bonds (1.5%), and Tier 2 subordinated debt (2.0%) for an 8.0% Pillar 1 base before buffers.
- The 72.5% aggregate output floor limits the RWA reduction benefit that Internal Ratings-Based (IRB) banks can achieve relative to the Standardized Approach.
- Liquidity Coverage Ratio (LCR) requires unencumbered Level 1, Level 2A (15% haircut), and Level 2B (25%–50% haircut) HQLA to cover 100% of 30-day stressed net cash outflows.
Benchmark Quantitative Metrics & Period Comparison
| Metric / Indicator | Current Value | Prior Period / Baseline | Change (bps / %) | Primary Source Code |
|---|---|---|---|---|
| Minimum CET1 Ratio (Including Conservation Buffer) | 7.00% of RWA | 4.5% Pillar 1 + 2.5% CCB | +1.0%-3.5% for G-SIBs | [BCBS-RBC20] |
| Basel III Endgame IRB Output Floor | 72.5% Standardized RWA | Phased Implementation | Caps Internal Model Benefit at 27.5% | [BCBS-FLO10] |
| Liquidity Coverage Ratio (LCR) & NSFR Minimums | ≥ 100% (30-Day / 1-Year) | HQLA / Net Outflows & ASF / RSF | Mandatory Pillar 1 Liquidity | [BCBS-LCR-NSF] |
> **Executive Answer-First Summary (RegTech Codex):** Under the consolidated Basel III Endgame framework (BCBS CAP10 / RBC20), internationally active banks must maintain a minimum Common Equity Tier 1 (CET1) ratio of 4.5% of Risk-Weighted Assets (RWA) plus a 2.5% Capital Conservation Buffer (7.0% base), a 0%–2.5% Countercyclical Capital Buffer (CCyB), and a 1.0%–3.5% G-SIB surcharge, with internal model RWA floored at 72.5% of the Standardized Approach alongside a ≥100% Liquidity Coverage Ratio (LCR).
Key Institutional Takeaways
- Total regulatory capital comprises CET1 (≥4.5% minimum), Additional Tier 1 CoCo bonds (1.5%), and Tier 2 subordinated debt (2.0%) for an 8.0% Pillar 1 base before buffers.
- The 72.5% aggregate output floor limits the RWA reduction benefit that Internal Ratings-Based (IRB) banks can achieve relative to the Standardized Approach.
- Liquidity Coverage Ratio (LCR) requires unencumbered Level 1, Level 2A (15% haircut), and Level 2B (25%–50% haircut) HQLA to cover 100% of 30-day stressed net cash outflows.
Verified Quantitative Benchmark Table
| Benchmark Metric | Current Reading | Prior Period / Baseline | Delta / Spread | Primary Source Code | | :--- | :--- | :--- | :--- | :--- | | Minimum CET1 Ratio (Including Conservation Buffer) | 7.00% of RWA | 4.5% Pillar 1 + 2.5% CCB | +1.0%-3.5% for G-SIBs | `BCBS-RBC20` | | Basel III Endgame IRB Output Floor | 72.5% Standardized RWA | Phased Implementation | Caps Internal Model Benefit at 27.5% | `BCBS-FLO10` | | Liquidity Coverage Ratio (LCR) & NSFR Minimums | ≥ 100% (30-Day / 1-Year) | HQLA / Net Outflows & ASF / RSF | Mandatory Pillar 1 Liquidity | `BCBS-LCR-NSF` |
Linked Financial Entities & Regulatory Scope
- **Bank for International Settlements (BIS) & Basel Committee (BCBS) (`BIS-BCBS`)** — *Basel, Switzerland (International)*: [RegTech Codex Verified] International financial institution owned by 63 central banks that hosts the Basel Committee on Banking Supervision (BCBS), setting global CET1, LCR, NSFR, and FRTB prudential standards.
- **Christine M. Lagarde (`ECB-PRES`)** — *European Union (Eurosystem)*: [RegTech Codex Verified] President of the European Central Bank and Chair of the European Systemic Risk Board (ESRB), overseeing Eurozone monetary policy and Single Supervisory Mechanism (SSM) bank governance.
- **Common Equity Tier 1 (CET1) Capital Adequacy Ratio & RWA Floor (`BASEL-CET1`)** — *Global Banking Supervision (BIS / Fed / ECB / MAS)*: [RegTech Codex Verified] The highest-quality loss-absorbing regulatory bank capital metric, calculated as Common Equity Tier 1 capital divided by total Risk-Weighted Assets (RWA) subject to the 72.5% Basel III Endgame output floor.
- **Monetary Authority of Singapore (MAS) Capital Markets Services (CMS) License (`MAS-SFA-CMS`)** — *Singapore*: [RegTech Codex Verified] Statutory regulatory license under Section 82 of the Singapore Securities and Futures Act (SFA) required for dealing in capital markets products, fund management, REIT management, and custodial services.
Primary Source Verification & YMYL Methodology
All numerical claims in this RegTech Codex research briefing have been cross-checked against primary central bank, regulatory, or exchange disclosures (https://www.bis.org/basel_framework/index.htm, https://www.eba.europa.eu/regulation-and-policy/single-rulebook). Timestamps are recorded in canonical UTC and rendered in the site's local institutional timezone (`Europe/Brussels`).
Linked Financial & Regulatory Entities
View All Site Entities →[RegTech Codex Verified] International financial institution owned by 63 central banks that hosts the Basel Committee on Banking Supervision (BCBS), setting global CET1, LCR, NSFR, and FRTB prudential standards.
[RegTech Codex Verified] President of the European Central Bank and Chair of the European Systemic Risk Board (ESRB), overseeing Eurozone monetary policy and Single Supervisory Mechanism (SSM) bank governance.
[RegTech Codex Verified] The highest-quality loss-absorbing regulatory bank capital metric, calculated as Common Equity Tier 1 capital divided by total Risk-Weighted Assets (RWA) subject to the 72.5% Basel III Endgame output floor.
[RegTech Codex Verified] Statutory regulatory license under Section 82 of the Singapore Securities and Futures Act (SFA) required for dealing in capital markets products, fund management, REIT management, and custodial services.
Frequently Asked Questions (FAQSchema Verified)
What triggers an Additional Tier 1 (AT1) Contingent Convertible (CoCo) bond write-down or equity conversion?▼
Under Basel III CAP30, AT1 instruments going-concern loss absorption is triggered mechanically when an issuer’s CET1 ratio falls below 5.125% (or a higher contractual trigger such as 7.0%) or at the Point of Non-Viability (PONV) determined by the prudential regulator.
How are Level 1 vs. Level 2A High-Quality Liquid Assets (HQLA) treated in the LCR numerator?▼
Level 1 assets (central bank reserves and 0% risk-weight sovereign bonds) enter HQLA at 100% market value with no cap, whereas Level 2A assets (20% risk-weight sovereigns, GSE MBS, and AA- or higher corporate bonds) receive a mandatory 15% valuation haircut and cannot exceed 40% of total HQLA.