T1 / T2 / T- declarations are union procedures and transit customs declarations with the same name that allow the transportation of the products subject to foreign trade, without paying customs duties, in the countries that are parties to the Common Transit Convention. A unique tracking number called MRN is assigned to each declaration opened in T status.

T1 is the union procedure that allows a non-European property to be transported in the countries of the Transit Convention without customs duties. A unique tracking number called MRN is assigned to each declaration opened in T status. -Items origin is not important when determining the regime. For example, for a German-origin item, the declaration type initiated from Trieste would be T1. The important thing is that the T declaration is filed before the commodity leaves the EU territory and / or enters the Free Zone. In this case, it becomes T2.

T2 is the Union procedure that allows Community (EU) goods to be transported in countries that are parties to the Transit Convention without paying customs duties. T2 declaration opened in countries that are party to the Convention widely used in transport to Turkey.