The cost is defined as the monetary value of input used in the production of a new product or service. Therefore, the cost is a relevant information, according to which decisions are made. The users of accounting information can be internal and external. Managers are the most important internal users of information. Shareholders or investors, banks, government institutions, public etc. are external. There is a variety of classifications of the costs by various criteria. The classification criteria are divided by time of creation of the costs, by terms of functions and positions in the financial statements, the possibilities of including carriers, the response to the change of activity, the significance of the decision-making costs and the ability to control it. Costs that are important for internal reporting are material preparation, payroll preparation and general costs of making which are related to the cost of the product. The costs of marketing and sales and administrative or management costs refer to the costs of the period. In addition to these costs, real, standard, targeted and planned cost should be emphasized. Manager makes business decisions for the company. He is responsible for them. The goal of management is not to reduce the costs, but to strive for the greatest possible benefit from the current cost. The main task of cost management is to achieve better results, i.e. goals with lower costs and without negative effects on business results.