Cost management in banks is important for budgeting, planning and decision making. It allows banks to predict expenditures and reduce costs. Cost management techniques include understanding cost drivers, implementing management accounts, using the 80/20 approach to prioritize opportunities, benchmarking against competitors, and adopting continuous improvement practices. Key areas of cost management are managing personnel costs through pay structures and productivity improvements, negotiating supplier costs through consolidation and intelligent bargaining, and reducing overhead costs in areas like rent, utilities, printing and travel. Strong leadership, accountability, and a cost-conscious culture are needed to effectively manage costs in banks.