Basel III Endgame Evolution: Banking Agencies Propose Major Capital Overhaul (Again)

On March 19, 2026, the federal banking agencies issued a package of proposed changes to the regulatory capital requirements for banking institutions of all sizes, from the largest GSIBs and super-regional banks to community banks (the “Proposed Rules”). This package of proposals is a second full attempt at implementing the 2017 “Basel III Endgame” international framework—following the agencies’ initial package of proposals in July 2023 (the “2023 NPR”)—to better reflect credit, trading and operational risk in the calculation of minimum regulatory capital ratios. If finalized, the rules would mark the culmination of a nearly decade-long effort to complete the fundamental overhaul of bank capital requirements initially spurred by the 2008-2009 financial crisis.