A number assigned to a company that is used when reporting foreign trade activities to the customs authorities. The name and length of the VAT identification number vary depending on the country and language. A European VAT identification number consists of a country and 8 to 12 additional digits, depending on the country. In SAP Business One, it can be entered in the object Business partner be recorded.

1. use of the UID number
- Intra-Community supplies: It is required when goods or services are exchanged between companies in different EU countries.
- Proof of entrepreneurial status: The VAT number confirms the company's status as a taxable business partner.
- Invoicing: The VAT number must be stated on invoices for intra-Community deliveries.
2. format of the UID number
- The UID number begins with a Country code (e.g. "DE" for Germany, "ATU" for Austria) followed by a Number sequence.
- the Number of digits varies from country to country.
- In SAP Business One the system checks the country-specific structure during input.
3. validity of the VAT number
- the The buyer's VAT number must be valid be necessary for an intra-Community delivery can be made tax-free.
- There is a EU-wide online confirmation procedure to verify the correctness of VAT numbers (e.g. via the MIAS system).
- SAP Business One only checks the Formatnot the content validity of the VAT number.
4. maintenance of the UID number in SAP Business One
- the own UID number can be found in the Company data of the company.
- For business partners (customers and suppliers), the VAT number is entered in the base data maintained:
- Field UID number in the business partner master data
- It can up to three UID numbers per business partner.
- The system checks whether the number of digits corresponds to the standard of the respective country.
5. effects on invoicing
- With intra-Community supplies the invoice must include both the own UID number as well as the VAT number of the customer must be specified.
- The invoice must also include a reference to the Tax exemption of the delivery stand.
6 Tax relevance
The UID number is a central element for the correct Tax treatment of intra-Community supplies and the Correct recording of the value added tax.
7. third countries and additional tax number
- Third countries: It can also be important for customers outside the EU to provide a VAT number in order to process cross-border business transactions correctly.
- Additional tax number: SAP Business One offers an additional field for further tax numbers, which can be used for identification in a company group, for example.
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