Cost information forms the basis for a range of business decision-making and is also needed for financial reporting. The requirements to such information are differentiated, which leads to the need for application of costing methods and procedures, with their variants established in internal company regulations. This paper presents the results of a study aiming to prove the research question about insufficient regulation of costing procedures in contemporary Russia, which results in risks of making inefficient managerial decisions due to presentation of irrelevant information. The paper substantiates the conclusion that accounting policies present a narrow and non-alternative list of items related to costing. Reasons behind this phenomenon are analysed and organized by factors. The paper suggests developing cost accounting policies for companies on the grounds of necessary conditions and key parameters.