The EU budget is the most important strategic document for financing the Union as a whole, which determines the total level of commitment and payment appropriations for the calendar year. It consists of the revenue and expenditure required for the functioning of the EU. Budget revenues consist of own resources in the form of traditional own resources (customs and agricultural levies), part of value added tax, GDP-based revenue and other revenue. GDP-based revenue was first introduced as a balance system, eventually becoming the largest source of Union revenue. In 2017, it accounted for 56% of all budget revenues. Traditional sources of revenue account for 15% and VAT revenues 12% of budget revenues for the last observed year of 2017. The expenditure side of the budget covers the administrative expenditure of the Union institutions (around 6%) and the policy costs (about 94%) that are part of the MFF. It limits expenditures for a minimum of 5 years and defines the maximum amounts available for each spending category and is currently valid Financial Perspectives 2014-2020. The EU budget is divided into 6 expenditure areas, namely: Sustainable growth, Smart and Inclusive Growth, Security and Citizenship, Global Europe, Administration and Compensation. Currently, most of the funds are spent on stimulating growth and job creation and reducing economic inequalities between regions. Regardless of the fact that budget expenditures are directed to the growth, development and improvement of life within the Union, there is always a risk of irregularities and fraud and a large number of participants involved in managing the risk of fraud. It is important to distinguish between irregularities and fraud, where an irregularity signifies any violation of EU or national law that could have an adverse impact on the EU budget, and fraud signifies the most serious form of irregularity committed with a view to generating illegal profits. All irregularities are not frauds at the same time, because irregularity may not always be intentional. The European Court of Auditors (Court of Auditors) is an independent EU auditor who examines the legality and regularity of all intra-budget transactions on the basis of a representative sample and estimates the "most likely error rate" for each VFO title. The Commission and the Member States have a shared responsibility for protecting their financial interests and fighting, and the European Anti-Fraud Office (OLAF) plays a key role. On the basis of the information received from the public and private sectors, an investigation process begins after the preliminary examination phase of the data, and if there is a reasonable suspicion of fraud. Upon completion of the investigation, OLAF sends a recommendation to the national judicial authorities. Through an analysis of the work, we have analyzed how well the EU's budgetary control systems perform their functions. In the future, there should certainly be work to increase the cooperation of the institutions in charge of controlling and extending powers. Also, the importance of controls and preventive actions should be better informed, as well as the development of national anti-fraud strategies that are harmonized at EU level.