Customs duties are a form of tax payable to the State mainly when importing goods into a customs territory. From a protectionist perspective, protective duties play an important role as they are designed to afford domestic producers some protection against foreign competition. In most countries, customs duties are levied as an ad valorem duty, which means the level of duty payable is calculated as a percentage of the value of a given product. By contrast, Switzerland applies the “specific tariff” system for most goods. The specific tariff here is payable per 100 kg net weight. Given the numerous customs duty reductions under the General Agreement on Tariffs and Trade (GATT; now the World Trade Organization), customs are now much less important in terms of international trade. In Switzerland, the Swiss Federal Customs Administration (FCA) is responsible for levying customs duties. Internationally, customs administration authorities are members of the broader World Customs Organization (WCOOMD).