A Basel III Deep Dive | What to Know About How It Will Transform Banking Globally

The U.S. banking system stands on the brink of a transformative regulatory shift with the long-delayed implementation of Basel III's 'endgame' reforms—yet as of 2026, they remain largely unimplemented. Chen Xu, a corporate counsel at Debevoise and Plimpton, explains that while the Basel Committee finalized the framework in December 2017, the U.S. has stalled due to political and bureaucratic inertia. The reforms aim to standardize risk weights globally, reduce reliance on banks’ internal models, and make capital requirements more risk-sensitive. For U.S. banks, this means a net reduction in capital requirements—especially for residential mortgages, investment-grade corporate loans, and commercial real estate—while trading and high-leverage lending face modest increases. However, these gains are partially offset by changes to stress testing and the G-sub surcharge, which could lower required capital. The real winners? Main Street banks and lenders focused on low-risk, high-quality credit. The reforms also introduce new scrutiny on undrawn credit commitments and operational risk, while leaving liquidity regulation and the discount window unchanged—despite the 2023 Silicon Valley Bank collapse. Meanwhile, the rise of private credit and non-bank financial institutions continues to grow, largely unchallenged by the new rules.