Why do you have to make a customs declaration ?

Customs declarations are mandatory for all parcels shipped to countries outside the European Union as well as for specific territories and French Overseas Territories. The information on the customs declaration is used by the customs authorities to establish customs duties and taxes, compile international trade statistics and conduct targeted checks.*

*Source French Customs : https://www.douane.gouv.fr/articles/a10847-a-l-import-ou-a-l-export-une-obligation-declarer-sa-marchandise

For more information, please consult our « customs formalities » section for the Colissimo Box.