This study delves into the multifaceted world of management accounting, exploring its crucial role in organizational success. It examines the key functions of management accounting, including cost control, inventory management, and planning, and analyzes the effectiveness of various systems like absorption costing and marginal costing. The study also evaluates the efficacy of three prominent planning tools: responsibility budgeting, standard costing, and net present value (NPV), providing insights into their strengths and limitations. By analyzing the financial statements of Tate and Lyle and Kerry Group Plc, the study provides a comparative analysis of their financial performance using key performance indicators and financial ratios.