The Combined Nomenclature forms the basis for the declaration of goods (a) at importation or exportation or (b) when subject to intra-Union trade statistics. This determines which rate of customs duty applies and how the goods are treated for statistical purposes. The CN is thus a vital working tool for business and the Member States' customs administrations. The latest version is now available as Commission Implementing Regulation (EU) 2017/1925 in the EU Official Journal.