The textbook deals with the basics of cost accounting - a subsystem of business accounting of an enterprise. The processes implemented by this subsystem are an integral part of modern management technologies, without which no successfully developing enterprise can do without. Methodological and organizational support of these processes, increase of their practical importance becomes the important element of accountancy harmonization, making it flexible and adaptive, and integration into the management of business entity. The application of advanced methodologies of cost accounting is one of the key tools for forming a comprehensive information base for decision-making on the economical and rational use of material, labor, financial, intellectual and other resources of the enterprise, elimination of losses.