Brazil’s national waterway transportation agency, ANTAQ, has initiated a formal regulatory review of its container demurrage framework under Resolution 62/2021, putting one of South America’s most contentious ocean carrier charging practices back on the policy agenda. The regulator has issued a public call for evidence to examine the transparency, calculation methodologies, and fairness of detention and demurrage penalties imposed by ocean liners on cargo owners and freight forwarders. This intervention follows ANTAQ’s recent push toward stricter oversight of carrier fees, including tighter reporting mandates on low-water Amazon surcharges. By re-evaluating demurrage rules, Brazilian authorities aim to prevent excessive fee abuses, streamline port clearance bottlenecks, protect local importers and exporters from uncompetitive practices, and align national maritime regulations with evolving global standards on liner tariff accountability.