Luxembourg · LU
The Luxembourg VAT number
Three identifiers for one company, each from a different administration, and none derivable from another.
Format: LU + 8 digits
Example: LU10137807
Issued by: the registration duties, estates and VAT authority (AED).
The format
A Luxembourg VAT number is always ten characters: the country code and eight digits, with no letters and no separators.
- LUThe country code.
- 101378Six identifying digits.
- 07Two check digits.
The last two digits are a modulus 89 check over the first six — one of the few checks in the Union that rests on neither modulus 11 nor modulus 97.
VAT number, matricule and RCS
Luxembourg runs three identifiers side by side, which is surprising for a country of its size.
The matricule — the national business identifier — is eleven digits and begins with the year of incorporation. It is used with social security and the administration generally.
The RCS number is issued by the trade and companies register in the form B 123456 for a commercial company, A 123456 for a trader or craftsman. It appears on correspondence and invoices but is not a tax identifier.
The VAT number comes from the AED and bears no computable relation to either the matricule or the RCS number.
Finding the company
The RCS
The trade and companies register can be consulted free of charge: name, legal form, seat, managers and filed annual accounts. It is searched by name or RCS number — never by VAT number — and there is no open bulk file to download.
The AED
The VAT authority offers a number check that confirms validity without returning the company name.
VIES
Luxembourg discloses the name and the address. The postcode carries an L- prefix — L-8232 — and the name often has the legal form appended after a comma, as in CERATIZIT LUXEMBOURG, SARL.
Luxembourg-specific pitfalls
- The VAT number is not the matricule. That is eleven digits and starts with the year of incorporation.
- The RCS number is not a tax identifier, despite appearing on invoices.
- The postcode carries an
L-prefix that has to be handled separately. - No open bulk file is published: the RCS is consulted one company at a time.
- The country holds a great many holding companies whose real activity cannot be read from the register.
One API for 27 member states
Vatlas turns a European VAT number into a company record: legal name, national identifier, legal form, status and address. Same call, same shape, for Luxembourg and for the other twenty-six.
curl "https://api.vatlas.dev/v1/vat/LU10137807" \
-H "Authorization: Bearer $VATLAS_KEY"Response:
200 OK
{
"data": {
"vatNumber": "LU10137807",
"countryCode": "LU",
"nationalNumber": "10137807",
"nationalId": null,
"name": "CERATIZIT LUXEMBOURG, SARL",
"legalForm": null,
"status": "active",
"address": {
"line1": "101, ROUTE DE HOLZEM",
"line2": null,
"postalCode": "L-8232",
"city": "MAMER",
"country": "LU"
}
},
"meta": {
"origin": "vies",
"source": "VIES",
"sourceUpdatedAt": "2026-08-28T10:16:57.336Z",
"checked": ["database", "VIES"]
}
}meta.origin says where the answer came from: database for a register imported locally, source for a national API queried live, vies as a last resort. The shape of the response never changes from one country to the next.
Free to try. An email address creates an account — no credit card, no sales call — with 100 requests a month and a working key in about a minute.
Frequently asked
The Luxembourg VAT number in short
How many digits does a Luxembourg VAT number have?
Eight after the LU prefix — ten characters in total.
Is the VAT number the national business identifier?
No. The matricule is eleven digits and starts with the year of incorporation; the VAT number is eight digits and comes from a different administration.
Is the RCS number a tax identifier?
No. It records the entry in the trade and companies register, in the form B 123456, and has no computable link to the VAT number.
Can I search the RCS by VAT number?
No. The register is searchable by company name or RCS number only.
How is the check computed?
The last two digits form a modulus 89 check over the first six — an unusual scheme in the Union.
VAT numbers in other countries
Last updated 28 August 2026.