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Fields & identifiers

VAT identification number

The VAT identification number identifies a business in the European single market and is mandatory for cross-border supplies — in EN 16931 it sits with the seller as BT-31.

Also:
USt-IdNr · UID · VAT ID · BT-31
Reviewed on 2026-08-26.

There is no long-form article for this term yet. The definition above is the complete entry; the related terms lead onwards.