The article compares the customs codes of the Eurasian Economic Union and the European Union to find ways to simplify customs procedures and boost international trade. The goal is to reduce administrative barriers that slow down the movement of goods between countries. By analyzing the approaches of both unions, the study aims to identify common principles for harmonizing customs affairs. The key finding is that harmonization of customs procedures is crucial for enhancing the efficiency of international trade and reducing material and time costs associated with customs formalities.