Standards
VAT identification number
A jurisdiction-specific tax registration identifier used in value-added tax administration.
- Kind
- Identifiers
- Steward
- National tax authorities; European Commission VIES for EU validation
- Official source
- https://ec.europa.eu/taxation_customs/vies/
What it describes
A VAT identification number identifies a tax registration within the rules of the issuing jurisdiction. In the European Union, the Commission's VIES service can validate whether an EU VAT number is recorded for cross-border transactions. Formats and validation rules differ by country; there is no single universal VAT-number syntax that can safely be applied to every jurisdiction.
A positive validation is evidence about a tax registration at the time checked, not a full legal-entity identity proof or a statement that a particular transaction qualifies for a tax treatment. Names and addresses returned by national systems can vary in availability. Store the jurisdiction, exact number, validation source, response, and observation time when using VAT data to reconcile counterparties.
Useful for
- Check tax-registration references.
- Separate similarly named taxable persons.
- Record time-specific VIES validation evidence.
Limits
- Formats vary by jurisdiction.
- Validation is time-specific.
- Does not decide the tax treatment of an invoice.
How it is used in practice
Tax registration numbers appear on invoices, in customer onboarding and in cross-border contracts. In the European Union, a supplier checks a customer's VAT number to decide whether an intra-Union supply can be invoiced without VAT, and the Commission's VIES service lets anyone ask whether a number is recorded as valid in the member state concerned. The VAT Directive sets the framework, while each member state issues numbers in its own format under national rules.
Outside the Union the equivalents have different names and different structures: goods and services tax numbers, business numbers, tax identification numbers. Treating them as one field is convenient for databases and misleading for evidence, because the legal meaning of the number, who may issue it and what a validation proves differ from one jurisdiction to the next.
A worked example
A fictional German buyer receives an invoice from Halden Laboratory Services GmbH (fictional), whose VAT number is printed on the invoice. The buyer submits the number to VIES and receives a response saying the number is valid, together with, where the member state makes it available, a name and an address.
The record that preserves this check contains the number as written, the member state, the response, the time of the query and the name and address returned. If the returned name differs from the invoice, the difference is noted rather than normalized away. Six months later the supplier is struck off. The earlier check remains a true statement about that date, and the later check is a new observation. Neither rewrites the other, and the record can show that the buyer relied on a valid registration when the invoice was accepted.
Evaluating a claim that rests on a VAT number
A positive validation shows that a number is registered for VAT purposes at the time of the query. It does not show that the company is solvent, that the invoice is genuine, or that the transaction qualifies for a particular tax treatment. It also does not prove that the party giving the number is the party registered under it: a number can be quoted by someone else. Matching the returned name and address with the other documents in the file is the practical test.
Format checks are weaker than lookups. A country prefix and a plausible length show that a string looks like a VAT number for that jurisdiction, and each jurisdiction has its own rules, so a single regular expression is not a safe validator. Where the VIES response is unavailable because a member state's system is down, the right entry is an explicit unknown with the date of the attempt, not an assumed pass or an assumed failure.
Confusions to avoid
A VAT number is not a company registration number and not an EORI. A company registry number shows that a legal person exists under national law. A VAT number shows a tax registration, which can belong to a branch, a sole trader or a group arrangement. An EORI number is a customs identifier that in some member states is derived from the VAT number and in others is not. The three should be stored as three fields with three sources.
It is also confused with a tax identification number for individuals or with a local-currency tax reference. Many countries issue several tax numbers to one taxpayer for different purposes, and only one of them is the VAT number. Recording the exact label the source used, and the jurisdiction, avoids mapping a taxpayer number into a VAT field because the column happened to be free.
Questions a reviewer can ask
Which jurisdiction issued the number, and what is its documented format? Was it validated by a lookup, and when? What name and address came back, and do they match the contract party? Was the lookup service available, and if not, is the status recorded as unknown? Does the claim concern a tax registration only, or is it being used to support a tax treatment, which needs further evidence? Are earlier lookups retained so that the status can be shown at the date of an invoice?
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Enquiry
Which of your sources carry VAT identification number?
Tell us which sources carry it, which key the same entity some other way and who may read which. We reply with whether and how a first record would use this identifier.
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