On April 8, the Federal Reserve Board, the FDIC, and the OCC adopted a final rule, effective January 1, 2018, requiring certain top-tier U.S. bank holding companies (BHCs) to maintain a minimum supplementary leverage ratio buffer of 2% above the minimum supplementary leverage ratio requirement of 3%. The final rule applies to BHCs with more than $700 billion in total consolidated assets or more than $10 trillion in assets under custody (Covered BHCs), and to insured depository institution subsidiaries of those BHCs (Covered Subsidiaries). A Covered BHC that fails to maintain the supplemental leverage buffer would be subject to restrictions on capital distributions and discretionary bonus payments. Covered Subsidiaries must also maintain a supplementary leverage ratio of at least 6% to be considered “well capitalized” under the agencies’ prompt corrective action framework. The final rule is substantially similar to the rule the agencies proposed in July 2013. Concurrent with the final rule, the agencies also (i) proposed a rule that would modify the denominator calculation for the supplementary leverage ratio in a manner consistent with recent changes agreed to by the Basel Committee, which would apply to all internationally active banking organizations, including those subject to the enhanced supplementary leverage ratio final rule; and (ii) proposed a technical correction to the definition of “eligible guarantee” in the agencies’ risk-based capital rules. The agencies are accepting comments on both proposals through June 13, 2014. Separately, the FDIC Board adopted as final its Basel III interim final rule, which is substantively identical to the final rules adopted by the Federal Reserve Board and the OCC in July 2013.