At the beginning of this thesis i wrote about the customs system in the republic of croatia. Customs include the oldest public benefits that have aways been used as a source of revenue for a state. Customs duties are charged when goods are transported across the customs border then i wrote a permanent customs service to the organization. Customs service affairs are the tasks of detarmining the collection ande supervision of customs duties of excise duties, special taxes, checks of customs measures, checks on imports of substances, as well as other posts performed by customs officers and when crossing the border. The powers of customs officers are prescribed by the Law on customs service, which are the tasks of the authenticity and authenticity of documents. I have written the customs systems sector, which includes various services such as the customs procedure service, the customs procedure service, the customs labaratory service and other services. Customs regulations of the Republic of Croatia after accession to the European Union customs regulations cease to be valid when the Customs Code of the Union is applied. Colorful for the republic of croatia as well as for other member states of the union represent a special form of tax determined by the customs law. Customs clearence is subject to some goods that do not have the status of a community. European Union one of the largest customs areas in the largest customs areas in the world. common customs tariff prescribes customs duties levied on imports of goods into the Union and represent the revenue of the budget of the European Union. Submit a single customs declaration to the customs administration for approval the customs administration for administrative organizations within the Ministry of finance prepares an expert basis for determining economic and development policy In the field of customs and excise systems and customs protection and customs protection systems.