Os impactos no Índice de Basiléia das instituições financeiras brasileiro do segmento S1, após implementação da Resolução n° 4.966/21 do Conselho Monetário Nacional

Abstract

This study aims to analyze the impacts of the implementation of CMN Resolution No. 4,966/21 on the Basel Capital Ratios of Brazilian financial institutions classified in the S1 segment. The research is justified by the systemic importance of these institutions to the stability of the National Financial System and by the need to understand the effects resulting from the convergence of Brazilian accounting standards to international standards established by IFRS 9, particularly regarding the expected credit loss model. The main hypothesis is that the adoption of Resolution No. 4,966/21 leads to changes in the capital indicators of S1 institutions due to increased requirements for credit loss provisions. Methodologically, the study is descriptive and documentary in nature, based on the analysis of financial statements published by S1 financial institutions before and after the mandatory implementation of the regulation in 2025. The results show that, although all institutions remain above the minimum regulatory capital requirements set by the Basel Accords, reductions in capital ratios are observed at varying levels, reflecting differences in risk management strategies and credit portfolio composition. The study concludes that Resolution No. 4,966/21 enhances prudential regulation and accounting transparency, while simultaneously imposing new challenges for capital planning within financial institutions