customs tariff customs tariff A listing of the goods on which a country’s government requires customs duty to be paid on being imported into that country, together with the rate of customs duty applicable. For the UK the Customs Tariff is published by the Stationery Office. customs union A union of two or more states to form a region in which there are no import or export duties between members but goods imported into the region bear the same import duties. The European Union is an example. |