By conducting any business activities in the company, a cost will be incurred. Therefore, costs in the company are constantly re-created and are present during the performance of any actions in the company. They represent the monetary expression of all elements present and used in the business process. This indicates that costs are a very important segment of the company's business and for this reason they need to be constantly monitored, supervised and adequately managed. For adequate accounting monitoring and understanding of costs, it is necessary to know the structure and theory and legality of costs. Costs can be classified and monitored in several ways in order to achieve the desired results and gain the status of a successful company. The possibilities of monitoring and managing costs are shown on costs of the company Kraš. It is a company that belongs to one of the most profitable industries in the manufacturing sector in the Republic of Croatia. By considering costs, the goal is to determine trends and the structure of cost movements over a certain period of time. This is the first step towards deciding on the application of certain valuation and cost management methods. The costs of manufacturing companies are more complex and therefore their monitoring is more complex. Costs can be valued using a variety of methods. It is possible to achieve a different picture of the financial result and performance of companies in the manufacturing sector by changing some of the methods of valuing certain types of costs. This is possible only if a short period of time is observed. In the long term, the method of calculating costs has no impact on the business success.