For UK businesses, this mismatch causes real friction. You might need an EU entity's identifier for a contract, a VAT check before invoicing, a customs declaration, or supplier due diligence, and each of those purposes usually points to a different number.
This guide covers how to work out exactly which identifier you need, where to search the right national register, how to validate VAT and EORI details separately, and the mistakes that trip up UK businesses most often since Brexit changed how GB and EU numbers interact.
Key Takeaways
- Confirm exactly which identifier is needed — national company number, VAT ID, or EORI — before you search anything.
- EU company registers are managed nationally; there's no single EU-wide lookup for registration numbers.
- Validate VAT numbers through VIES and EORI numbers through the EU's separate customs checker.
- Keep the entity's legal name, country, registered address, and incorporation documents on hand to resolve mismatches.
What You Need to Identify the Correct EU Company Number
Before opening a single register, work out what the number is actually for. A company registration number proves legal incorporation in a specific country.
A VAT identification number supports tax reporting. An EORI number exists purely for customs declarations. Treating these as interchangeable is the single biggest cause of delay.
Company Details to Gather
Collect these before you search anything:
- Exact legal name (as it appears on incorporation documents, not the trading name)
- Country of incorporation and registered office address
- Legal form: GmbH, SARL, BV, S.r.l., and similar suffixes matter
- Company website and any reference number already supplied
Names often appear differently across languages, transliterations, and abbreviations. Search using the legal name shown on invoices or contracts, not a marketing name.
Documents and References to Check First
Review whatever paperwork you already hold:
- Certificate of incorporation or commercial register extract
- Articles of association or constitutional documents
- Tax registration certificate, invoices, and customs paperwork
- Supplier onboarding forms
Watch for labels such as "company number," "commercial register number," "VAT ID," "tax identification number," or local-language equivalents. These labels don't refer to the same thing, so don't assume otherwise.
Determine Which Identifier the Requester Means
| Identifier | Identifies | Used for |
|---|---|---|
| Company registration number | The legal entity in its home country | Incorporation status, legal existence |
| VAT identification number | A business registered for VAT | Tax reporting, intra-EU invoicing |
| EORI number | An economic operator | Customs declarations, imports/exports |
If a request simply says "EU company registration number," ask the requester for the country, the identifier type, and what it's needed for. It saves several rounds of back-and-forth.
Methods to Find an EU Company Registration Number From the UK
The correct route depends on whether you need legal-registration evidence, VAT validation, or customs identification. Use the path that matches the document or check you actually need.
Search the Relevant National Business Register
- Identify the member state of incorporation. The registration number is issued and maintained by that country's own commercial register.
- Search the official register using the exact legal name, registered address, or any existing registration details you have.
- Compare the result (legal name, status, registered address, legal form, and directors where public) against what the company gave you.
Register names, languages, search fields, and fees all vary. Some useful starting points:
| Country | Register | Notes |
|---|---|---|
| Germany | Handelsregister | Register documents free online since 2022 |
| France | INPI / RNE | Search by name, SIREN, or SIRET |
| Netherlands | KVK Handelsregister | Basic details free; extracts paid |
| Ireland | CRO (CORE) | Search by name or number; English and Gaeilge |
| Italy | Registro delle Imprese | Limited info free; fuller records paid |
| Poland | KRS | Search by name, KRS number, NIP, or REGON |
| Belgium | BCE/KBO Public Search | Free; available in four languages |
As an alternative, the European e-Justice Portal's company search pulls from interconnected national registers by name or registration number. It's a useful shortcut, but it only surfaces information the national registers already provide free of charge.
It doesn't replace the underlying register for anything formal.
Check the Company's Own Documents and Request Confirmation
Before searching a register at all, check what you already have: incorporation certificates, official extracts, contracts, invoices, and the company's website legal notice often carry the number directly.
If it's not there, send a short confirmation request asking the entity to provide:
- Its exact legal name and country of registration
- Its company registration number
- Its VAT number, if applicable
- Its EORI number, if goods cross borders
For anything going into a bank application, tender, legal agreement, or tax filing, ask for a recent official register extract rather than relying on an email reply alone.
Validate VAT or EORI Details When That Is the Real Requirement
If VAT is actually what's needed, use the European Commission's VIES VAT number validator. It checks whether a VAT number is active for intra-EU transactions. It is not a general company-registration search tool, and it won't confirm the entity's incorporation status.
For customs matters, use the EU's EORI validation service. An EORI number should never be substituted for a company registration number — they serve entirely different purposes.
Either way: check the country prefix, legal name, and address against your own records, and save a dated screenshot or confirmation for your compliance file.
How to Interpret and Verify the Result
Finding a number isn't the end of the job. It has to match the correct entity, country, legal status, and purpose.
National Company Registration Number
A reliable result should show the entity's legal name, incorporation status, registered address, legal form, and the competent register that issued it.
Number length, prefixes, and separators differ by country. Don't reject a result just because it doesn't look like a UK Companies House number.
For reference, formats vary widely:
- French SIREN: 9 digits
- Dutch KVK number: 8 digits
- Belgian company number: 10 digits, starting with 0 or 1
Record the number exactly as shown, including any letters or spacing, plus the name of the issuing authority.
EU VAT Identification Number
VAT numbers carry a country prefix and can display differently across invoices and validation tools. The format alone doesn't prove the underlying company details are correct.
A successful VIES result confirms the number is active for intra-EU transactions on the date checked. It doesn't confirm the trading relationship, invoice accuracy, or that the company is who it says it is.
EORI Number
An EORI is relevant to import and export activity, not proof of incorporation. A business can hold a valid EORI even when you don't need one for your purpose.
If a Number Isn't Found
- Check for typing or prefix errors first
- Allow for newly issued or restricted records
- Ask the entity to confirm directly
- Contact the relevant national authority if it still doesn't resolve
Documentation and Compliance Record
Keep a compliance record with:
- Source URL and the date you checked
- The result itself
- Supporting documents
- Any correspondence confirming the identifier
Registry and tax information changes. For anything material, use a recent extract or current validation result rather than relying on an old record.
Common Errors and Best Practices
Most mistakes come from mixing up identifiers or trusting the wrong source. Watch for:
- A UK company number, EU national registration number, VAT ID, tax number, and EORI each serve a different legal purpose. None substitutes for another.
- Brand or trading-name searches often miss the exact legal entity, local-language spelling, company suffix, or registered country.
- Directory listings, invoice footers, and marketplace profiles are not final proof. Confirm details on the official register or validation service.
- Outdated register extracts can show the wrong legal name, address, or company status. Reconcile differences before you rely on them.
Post-Brexit, GB-prefixed EORI and VAT numbers are no longer available to check through EU systems. VIES stopped validating GB VAT numbers in 2021, and GB EORIs aren't recognised for EU customs formalities. Northern Ireland's XI-prefixed numbers follow different rules. If a UK number and an EU number both apply to your transaction, don't treat them as interchangeable.
If you're juggling multiple EU entities alongside UK operations, the reconciliation work adds up quickly. VJM Global supports foreign businesses with cross-border accounting, tax compliance, and document verification as part of broader bookkeeping and reporting work. That support helps when you manage several jurisdictions at once, but it is not a substitute for the official national register or EU validation tools.
Conclusion
There is no single EU company registration number. The correct identifier depends on whether you need legal-registration evidence, VAT validation, or customs identification, and each one comes from a different source.
The reliable process stays the same regardless of country:
- Identify the EU member state and the exact legal entity
- Search the official national register or the relevant validation service
- Compare the result against supporting documents
- Keep a dated record of what you checked
When a request is ambiguous, confirm it before submitting anything. When the number affects tax filings, customs clearance, banking, or contractual due diligence, get professional advice rather than guessing.
Frequently Asked Questions
What is a UK company registration number?
It's the unique number Companies House issues when a UK company incorporates, shown on the certificate of incorporation. It's distinct from a UK VAT number and a Unique Taxpayer Reference (UTR).
Is there an EU company registration number?
No. The EU doesn't issue one universal company registration number — each member state maintains its own commercial or business register with its own numbering system.
How do I find an EU company's registration number?
Identify the member state of incorporation, then search that country's official business register using the exact legal name and registered address. Always confirm the result against official documents.
Is an EU VAT number the same as a company registration number?
No. A VAT number identifies a business for VAT purposes, while a company registration number confirms legal incorporation. Only use VIES when VAT validation is actually what you need.
Is an EORI number the same as a company registration number?
No. EORI identifies an economic operator for customs activity and isn't a substitute for the company's national registration number.
Can I search for an EU company from the UK?
Yes. UK-based users can search the relevant member state's online register or request official documents remotely, though access, language, and fees vary by country.
