Switzerland has concluded free trade agreements with a number of countries. The preferential treatment granted under these agreements applies only to goods which comply with the origin provisions and procedural rules, however.
Are you exporting your goods? In order for goods exported from Switzerland to benefit from preferential tariffs (duty reduction or exemption) in the country of destination (free trade partner country) within the framework of the relevant agreement, a corresponding proof of origin must be made out/requested.
On the following websites, you will find further information in French, German and Italian: