The purpose of the study is to study the organization and procedure for conducting an audit of operating expenses of the enterprise. Materials and methods. The study used research methods such as monographs and synthesis (when analyzing existing publications), analysis, induction and deduction, comparisons and key components. Research results. The essence of the audit is to provide practical assistance to the management and economic services of the enterprise in the management and management of its finances, as well as the establishment of financial and management accounting, providing various consultations. Audit can be divided into the following stages: organizational, pilot, final. Operating expenses are a major component of an enterprise's costs. These are the costs associated with the main activity of the enterprise (production of products, services, performance of work). According to P (C) BO 16 “Expenses” to operating expenses include administrative expenses, sales expenses, other operating expenses. Expenditure audit entities may include: accounting policies, cost accounting transactions, records in primary documents, accounting records and reporting, information on accounting misconduct, and abuses that have been documented in audit acts, audits, auditors' reports. The audit of costs should begin with the verification of the statement of financial results to confirm the accuracy of its performance, the study of the organization of production (if the enterprise is engaged in production) and technological processes, the study of cost estimates, planned calculations and other conditions. When reviewing the accumulation and write-off of administrative expenses, sales costs and other operating expenses, the auditor should check the correctness of the classification of expenses to administrative, sales and other operating expenses. The following techniques are used to collect audit evidence: document verification, confirmation, counting, surveys, analytical procedures. Through the procedures of observation, questioning and confirmation, they obtain the supporting information contained in the accounting records. The calculation procedure consists in checking the arithmetic accuracy of the primary documents and accounting records or in performing the calculations independently (inventory). Analytical procedures involve the analysis of the most important indicators and ratios, including a summary study of deviations and relationships that conflict with other information relevant to the case or deviate from the expected indicators. During the cost audit, the auditor checks the appropriateness of the formulas used in the calculations, the correctness of the calculation procedures (the amount of tests depends on the materiality of the estimated values). Conclusions. Operating expense audit is an integral part of an enterprise's overall audit. Improving organizational aspects of cost audit is associated with deepening the practice of analytical procedures at all stages of the audit. For organization of internal audit of expenses at the enterprise it is necessary to carry out regular control of correctness of their formation.