Use the CompanyID element to model a party's Tax ID such as a VAT number. You can add a country code as a prefix to the ID.

Elements

Element	Topic
`Invoice/AccountingSupplierParty/Party/PartyTaxScheme/CompanyID`	Supplier
`Invoice/AccountingCustomerParty/Party/PartyTaxScheme/CompanyID`	Buyer
`Invoice/TaxRepresentativeParty/Party/PartyTaxScheme/CompanyID`	Supplier's Tax Representative

Restrictions

You must a country code from the ISO 3166-1 alpha2 list. Example here.

Example

The following example shows a Buyer's tax ID that is prefixed with the ISO 3166-1 alpha2 country code:

<Invoice>
    <!-- code omitted for clarity -->
    <cac:AccountingCustomerParty>
        <cac:Party>
            <!-- code omitted for clarity -->
            <cac:PartyTaxScheme>
                <!-- Prefixed with DE-->
                <cbc:CompanyID>DE123456789</cbc:CompanyID>
                <cac:TaxScheme>
                    <cbc:ID>VAT</cbc:ID>  
                </cac:TaxScheme>
            </cac:PartyTaxScheme>
            <!-- code omitted for clarity -->
        </cac:Party>
    </cac:AccountingCustomerParty>
    <!-- code omitted for clarity -->
</Invoice>