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Seller VAT identifier

BT-31 (Seller VAT identifier) is a business term of EN 16931, the European e-invoicing standard. This page shows where the field lives in a UBL invoice, how often it may appear and which validation rules check it.

Seller's VAT number; required for reverse charge.

Group: BG-4 (Seller)

Cardinality: 0..1

UBL element: cac:AccountingSupplierParty/cac:Party/cac:PartyTaxScheme/cbc:CompanyID (VAT)

Example value: NL123456789B01

Validation rules that check this field

• BR-CO-9VAT identifier is missing its country prefix