The classification of technically sophisticated products under a customs tariff can be difficult. The importer and customs authorities might therefore disagree on the correct classification of a particular product. A disagreement becomes more likely if the duty rates applicable to the eligible customs tariff numbers differ considerably. It might even result in retrospective duty demands and a legal dispute.
To avoid such conflicts, the EU established the Binding Tariff Information (BTI) as an instrument to provide legal certainty for economic operators with respect to the classification of a product. A BTI is issued on application by the national customs authorities. It is valid for a period of three years. A BTI is binding on the holder and every customs authority in the EU.
All BTIs are published in the "European Binding Tariff Information" (EBTI) database on the Web site of the European Commission (https://ec.europa.eu/taxation_customs/dds2/ebti/ebti_home.jsp?Lang=en).

The BTI reference must be indicated in import as well as export declarations.