RegTech Codex Briefing #1: Basel III Endgame Encyclopedia: CET1 Capital Stack, 72.5% RWA Output Floor, LCR & NSFR Mechanics
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).