The granting of tariff preferences at import depends on the presentation of specific proofs of origin that are defined in the preferential agreements. Formal proofs are usually issued by the national customs authorities on specific forms.
In most of the EU's preferential agreements with third countries, the movement certificate EUR.1 is the designated proof of preferential origin. As the EU and Turkey form a customs union, a special certificate is used for most goods movements between the EU and Turkey (movement certificate A.TR). The movement certificate A.TR proves that the goods imported from or exported to Turkey are goods in free circulation of the EU and Turkey respectively.
The USMCA does not define a formal certificate of origin. A claim for preferential treatment under the USMCA, however, must contain nine minimum data elements that may be provided on any commercial document.
The EU's preferential agreements with third countries also provide for informal proofs of preferential origin. If a company has the status of an approved exporter, it may submit an invoice declaration, using the prescribed wording from the agreement on the commercial invoice. As a rule, the invoice declaration may be used by any exporter if the originating goods supplied are valued at less than EUR 6,000.
Some of the more recent agreements do not provide for formal proofs of origin. Instead, the certification of the origin of goods is solely based on self-certification: The economic operators themselves declare the origin of goods in so-called statements on origin. The prerequisite for this procedure is the registration of the economic operators as "registered exporters"(REX) with their national customs authorities.