This report provides an overview of management accounting and its system. It discusses the various methods and tools used for management accounting reporting. The report also highlights the benefits of management accounting system and its application in making strategic decisions. It further explores the calculation of income statement using marginal and absorption costing method. Additionally, it discusses the merits and demerits of planning tools used in budgetary control. The report is based on the financial consultancy firm AJ and Sons and their client Innocent Drink, who faced financial problems during COVID-19.