Foreign companies regularly need a French business identifier before they can invoice a customer, employ a person, rent operational premises or answer a bank’s compliance request. That does not automatically mean incorporating a French SAS or SARL. A company formed abroad may, depending on the reality of its French activity, register an establishment, a branch or another qualifying presence while keeping its original legal personality. The French identifier is then connected to the foreign legal entity and to the French establishment; it is not proof that a new French subsidiary exists.

Three questions must be kept separate. First, does the company have a French establishment or an activity that requires a French registration? Second, which filing creates the SIREN and SIRET numbers, and which register or administration records them? Third, does the company also need a French VAT registration, an employer account with URSSAF (the body that collects social-security contributions), or an e-reporting process? A SIRET answers only part of that chain. The firm’s French corporate law and company-formation service page provides the broader context for a board planning its French presence. This guide is for foreign legal entities and their boards. It does not treat the separate situation of an individual moving to France, and it does not turn a French tax analysis into a registration shortcut.

I. Can a foreign company obtain a French SIRET without creating a French subsidiary?

A. What do SIREN, SIRET, RCS, RNE and SIRENE actually identify?

The first practical mistake is to treat every French number as if it meant the same thing. The SIREN is the nine-digit identifier of a legal unit. The SIRET is the fourteen-digit identifier of an establishment: it combines the legal unit’s nine-digit SIREN with a five-digit NIC, or “Numéro Interne de Classement”, for that particular location. The official INSEE definition of the SIREN and its definition of the SIRET should be kept with the company’s filing records. A company can therefore have one SIREN and several SIRET numbers if it operates several French establishments.

The SIRET is not itself a company form. It does not create an SAS, a SARL or a French subsidiary. It does not prove that the company has a permanent establishment for corporate-tax purposes, and it does not activate a VAT number. It identifies an establishment in the French statistical and administrative registers. The VAT number, usually beginning with “FR” and containing the SIREN, follows a separate tax procedure. The number shown on a bank form, a purchase order or an invoice must therefore be matched with the exact legal entity, establishment address and tax status rather than copied without verification.

The Registre du commerce et des sociétés, or RCS, is the commercial and companies register. It is handled by the competent greffe, meaning the registry office attached to the commercial court. A Kbis is an official extract showing information recorded for an entity or establishment in the RCS; it is not a synonym for the SIRET and it is not always the document that proves an entity recorded only in another register. The Registre national des entreprises, or RNE, is the wider national register. The Guichet unique, operated through the INPI business formalities service, receives the electronic formalities and routes the information to the relevant bodies. SIRENE is the national register managed by INSEE for enterprises and establishments; its purpose and scope are explained in the official SIRENE information.

The starting point is Article L. 123-1 of the French Commercial Code. Its first paragraph states: « I.-Il est tenu un registre du commerce et des sociétés auquel sont immatriculés, sur leur déclaration: » The same provision expressly includes, in point 3°, « Les sociétés commerciales dont le siège est situé hors d’un département français et qui ont un établissement dans l’un de ces départements ». The current text is available on Légifrance, Article L. 123-1. This is the legal bridge between a foreign commercial company and registration in France when it opens a qualifying establishment. It does not say that every foreign company with a French customer must create a French subsidiary.

The distinction is reinforced by Article L. 210-6 of the Commercial Code, which provides that « Les sociétés commerciales jouissent de la personnalité morale à dater de leur immatriculation au registre du commerce et des sociétés. » That rule concerns the legal personality of French commercial companies. A foreign parent that registers a French establishment does not thereby acquire a second legal personality. The parent remains the contracting entity, subject to the consequences of the branch or establishment it operates. The exact text is on Légifrance, Article L. 210-6.

The RNE also matters in cases where the company does not have a traditional French permanent establishment. Article L. 123-36 of the Commercial Code includes « 6° Les entreprises étrangères sans établissement stable en France. » The provision is available through Légifrance, Article L. 123-36. That wording is a warning against a simplistic rule that “no permanent establishment” always means “no French administrative identity”. A foreign company can have French formalities, VAT or reporting obligations even when the tax analysis does not classify its activity as a permanent establishment. The filing route and the tax route must be analysed together but not confused.

Finally, the legal number and the public notice are different items. A change, opening or closure can be reflected in the RNE, RCS, SIRENE records and, where required, in the BODACC, the “Bulletin officiel des annonces civiles et commerciales”. A counterparty may ask for a Kbis, an INSEE SIRENE notice, a SIRET certificate, a VAT certificate or a tax letter. Before responding, identify what the request is meant to prove: legal existence, French establishment, VAT status, authority to contract, or the identity of the beneficial owner. One document rarely proves all five points.

B. Which French presence creates the right to an establishment number?

The central question is not whether the founder wants a SIRET. It is what the foreign company actually does in France. A branch or succursale is a French establishment without a separate legal personality. An agency or representative office may also require analysis when it has a real operational function. A warehouse, workshop, staffed sales office, customer-support centre or place from which contracts are habitually performed can be materially different from a purely preparatory liaison office. A French address on a website, by itself, is not a safe test in either direction.

Article L. 123-11 of the Commercial Code requires a legal person seeking registration to justify premises, and it refers to « l’agence, la succursale ou la représentation établie sur le territoire français » where the head office is abroad. The current wording is on Légifrance, Article L. 123-11. The evidence can include a commercial lease, a domiciliation agreement, a document proving the right to occupy the premises, or a coherent explanation of the establishment’s function. A domiciliation address cannot be used to disguise a materially different operation. If the filing says “administrative address” while the company stores stock, receives customers and employs staff there, the description may invite a correction request or a deeper tax review.

The Cour de cassation has adopted a practical approach to a foreign company’s French activity. In its decision of 20 June 2017, no. 14-85.879, the criminal chamber stated: « une société commerciale immatriculée dans un pays étranger est tenue de s’immatriculer au registre du commerce et des sociétés français » when it opens an establishment in a French department, on the basis of Articles L. 123-1, I, 3°, L. 123-11 and R. 123-35 of the Commercial Code. The decision is available on the official Cour de cassation record, no. 14-85.879. The useful point for a board is not merely the citation: registering in the home country does not replace French registration for a French establishment.

An earlier decision illustrates the risk of leaving an autonomous activity unrecorded. In its decision of 26 October 2004, no. 03-86.970, the criminal chamber described the conduct in these terms: « Holger X… a exercé en France, une activité réelle et permanente de transport routier de marchandises sans avoir requis l’immatriculation » of the enterprise he directed. The exact decision is published by the Cour de cassation, no. 03-86.970. That case is not a universal formula for every cross-border sale. It does show why the company’s operational facts, not its preferred label, control the registration risk.

The most useful classification for a foreign board is the following.

• Remote cross-border sales. A company may sell to French customers from abroad without operating a French establishment. That does not automatically produce a SIRET. It can nevertheless create French VAT, customs, consumer-law, product, platform or e-reporting obligations depending on the transactions.
• Liaison office. A genuine liaison office usually performs information, market research or coordination that does not amount to an autonomous commercial activity. It must be described honestly. If staff negotiate, conclude contracts, hold stock or deliver services from France, the facts may move the operation toward an establishment or branch.
• Branch or succursale. The foreign company keeps its original legal personality, but the French establishment has an operational address and is registered through the applicable French formalities. The parent remains exposed to contracts and liabilities connected with the branch.
• French subsidiary. An SAS, SARL or other French company is a separate legal person once its own incorporation and registration are completed. It has a separate SIREN and SIRET. It may be commercially appropriate, but it is not the only route to a French establishment number.

There are also cases where a foreign company has no French permanent establishment but still needs a French administrative record. It may have French employees, a French VAT obligation, a regulated activity, a taxable event or a reporting duty. Article L. 123-36 should be read with the precise formalities and tax instructions applicable to the activity. The Ministry of the Economy’s guide to establishing a foreign company in France distinguishes the liaison office, branch and subsidiary and explains why the Guichet unique can be relevant even when the foreign company is not incorporating a French subsidiary.

The decision should therefore be based on four factual tests: where people work, where assets or stock are held, where contracts are negotiated or performed, and which French obligations have already arisen. Add a fifth test for regulated sectors: a financial, health, transport, food, construction or employment activity may require an authorisation or registration that has nothing to do with the SIRET itself. A French identifier cannot cure the absence of a required licence, and the absence of a SIRET cannot be used as evidence that no French activity exists.

II. How should a foreign founder file for the French number and protect the next steps?

A. What should be filed through the INPI Guichet unique?

Once the facts justify a French establishment or another qualifying registration, use the Guichet unique rather than sending disconnected requests to several administrations. Article L. 123-33 of the Commercial Code states: « Ce dossier est déposé par voie électronique auprès d’un organisme unique désigné à cet effet. » The current article, including the rule that a complete and regular filing is treated as the declaration, is available on Légifrance, Article L. 123-33. The official business formalities portal also explains that the system applies to foreign businesses developing activity in France.

The formalities are routed from one electronic dossier to the bodies that need the information. Article R. 123-1 describes a single dossier and includes « y compris les informations relatives au bénéficiaire effectif ». That reference to the beneficial owner is important for foreign groups: an extract from the parent’s home register is not always enough if the chain of ownership, control or voting rights is not clear. Read the current text on Légifrance, Article R. 123-1 and prepare the ownership chart before the filing is started.

For a foreign legal person, Article R. 123-54 requires information about the foreign entity and its registration abroad. The rule refers to the public register’s « numéro et lieu d’immatriculation dans un registre public ». The full provision is on Légifrance, Article R. 123-54. A recent certified extract from the home register, the company’s constitutional documents and the resolution approving the French establishment should be assembled in a consistent evidence pack. If the foreign country uses a different legal vocabulary, add an English explanation for the filing team and a French translation where the authority requires it.

The minimum preparation list should usually cover the following items, with the exact list adapted to the company and the activity:

• the foreign company’s current registry extract or certificate of existence, showing its legal name, registration number, registered office and legal form;
• the constitutional documents and any recent amendment relevant to the company’s authority to open an establishment abroad;
• the board or shareholder decision approving the French establishment, together with the appointment and powers of the person who will represent it in France;
• identity, address and role information for the foreign directors, the French establishment representative and the beneficial owners, with a group chart when the ownership chain is layered;
• proof of the French premises or the legal basis for the establishment’s address, such as a lease, a domiciliation contract or another document showing the right to occupy the premises;
• a precise description of the French activity, the expected start date, the establishment’s trade name if different, the number of employees and the locations where services, stock or customer operations are handled;
• documents proving any regulated authorisation or professional qualification that the activity requires;
• an apostille, legalisation or equivalent authentication when the origin country and the document type make it necessary, followed by a French translation when required by the receiving authority; and
• a tax and VAT note stating whether the company expects to make French taxable supplies, import goods, use the reverse-charge mechanism, employ people or operate under a tax treaty.

The filing should not use a generic “French office” description if the company is actually opening a branch, employing staff or storing inventory. The description should state what the establishment does and what it does not do. That precision helps separate the commercial-registration question from the permanent-establishment question. It also gives the tax administration, social-security bodies and a bank a common factual record.

Article R. 123-77 confirms that an application or document deposit is made through the single body: « Toute demande d’inscription ou tout dépôt d’acte ou de pièce au registre du commerce et des sociétés est effectué par l’intermédiaire de l’organisme unique ». The provision is available on Légifrance, Article R. 123-77. The same article addresses electronic copies and signatures in the registration process. Article R. 123-5 also governs electronic signing and provides that, for the creation or modification of a business formalities file, a simple electronic signature can be used in the circumstances set out by the code. Its current text is on Légifrance, Article R. 123-5. Always follow the signature level displayed by the portal for the specific formalities rather than assuming that a scanned handwritten signature is sufficient.

After submission, save the dossier number, the receipt, every message requesting a correction and the final registration evidence. Article R. 123-6 explains that the electronic receipt identifies the recipients and authorities and informs the declarant of decisions or requests for additional documents. The current wording is on Légifrance, Article R. 123-6. A foreign founder should nominate one person to monitor the portal and one lawyer or compliance lead to answer substantive requests. A request for a home-country extract, translation or premises proof should be answered with one dated and indexed package, not with a series of inconsistent uploads.

Do not file a second, slightly different establishment merely because the first SIRET has not appeared quickly. A duplicate can create two addresses, two commencement dates or two activity descriptions that later need to be reconciled. First identify whether the delay concerns INPI validation, a request from the greffe, an INSEE allocation, a tax registration or a missing document. The INPI explanation of the Guichet unique workflow describes the transition from the pre-SIREN stage through validation, the final SIREN and transmission to the relevant administrations. The exact status shown on the portal should drive the next response.

B. What must be done after the SIRET is assigned?

The first post-registration task is to create a reconciliation table. Record the foreign legal name and registration number, the French SIREN, every French SIRET, the establishment address, the activity code, the RCS or RNE evidence, the VAT number if assigned, and the relevant tax service. Give that table to the bank, accountant, payroll provider and invoicing team. A SIRET may be assigned before a VAT number is activated, and a VAT number may be needed for a foreign company without a conventional branch. Those are different administrative events.

For VAT, start with the official French tax administration guidance on VAT registration and the page for foreign companies. The company may need to register because it makes taxable supplies in France, imports goods, holds stock, sells through a particular channel or must report transactions under the applicable rules. A company established in another European Union state and a company established outside the European Union do not always follow the same representative and filing rules. In particular, the tax administration may require a fiscal representative for a non-EU company that is liable for French VAT, subject to the applicable exceptions and treaty or statutory rules. Confirm the responsible tax service, often the Service des impôts des entreprises étrangères, or SIEE, and the document list before invoicing.

The SIRET does not replace the VAT number. It also does not make every invoice subject to French VAT. A customer may need to apply reverse charge, a transaction may be outside French VAT, or a specific exemption may apply. The invoice should match the legal entity that made the supply, the establishment involved, the VAT place-of-supply analysis and the VAT number actually issued. If the French identifier is used on an invoice while the VAT registration is pending, explain the status to the customer and obtain tax advice before treating a number as proof of VAT entitlement.

The French electronic-invoicing and e-reporting reform adds a time-sensitive layer. The English guidance from the French tax administration on e-reporting for foreign companies without a permanent establishment addresses foreign businesses that may have French VAT reporting obligations even without a French permanent establishment. The timetable announced by the administration distinguishes the first implementation date of 1 September 2026 for large and intermediate-sized businesses from the later 1 September 2027 date for small and medium-sized businesses, subject to the legal scope of the transactions and the company’s category. The implementation must be tested against the company’s turnover, customer type, VAT liability and invoicing flows. A SIRET is a useful identifier in that project, but it is not the e-reporting analysis.

If the company hires its first person in France, review the employer route separately. URSSAF is the French body that collects most social-security contributions; an establishment number is not an employer account, a payroll registration or a determination of the employee’s social-security legislation. The payroll provider needs the exact French establishment, the employer’s legal entity, the employee’s place of work and the applicable employment status. A foreign company that sends an employee temporarily to France may also need an A1 certificate or another cross-border social-security document. A company that directly employs someone working in France may need a much broader employer setup. Do not present the SIRET as a substitute for those checks.

Corporate tax and permanent-establishment analysis must run in parallel. The French tax administration’s page on a foreign company carrying on activity in France is a useful starting point, but the facts of the group, treaty residence, authority of French staff, premises and revenue-producing functions still matter. The same address can be a simple correspondence address in one business model and a tax-sensitive operating location in another. The company should keep minutes, contracts, delegation documents, staff roles and premises descriptions aligned with the tax position it adopts.

For an establishment registered in the RCS, the Kbis or equivalent registry extract should be checked against the SIRET and the actual activity. For an entity recorded through the RNE or another route, use the official Annuaire des entreprises, the INSEE evidence and the applicable filing record. BODACC notices may be relevant for creation, modification, insolvency or closure events. A bank or customer that asks for a “Kbis” may be using the word generically; give it the document that proves the requested fact and explain the difference if the foreign company is not in the same registry category as a French subsidiary.

The company must also maintain the establishment record. Article L. 123-33 governs the electronic route for amendments, and Article R. 123-75 contains the specific rule that « La radiation de l’immatriculation secondaire de toute personne morale est demandée dans le mois de la cessation d’activité dans le ressort du tribunal. » The exact provision is on Légifrance, Article R. 123-75. When an office closes, staff leave, a branch stops trading or the company changes the establishment’s activity, update the record promptly. Leaving a dormant SIRET active can lead to inconsistent tax, payroll, bank and public-register information.

When INPI, the greffe, INSEE or the tax administration says that the file is incomplete, use the following response sequence:

1. Download the message, receipt and file history, and identify the authority that made the request. “INPI pending” is not the same as “greffe refusal”, and neither is the same as a VAT application being reviewed.
2. Translate the request into a single list of missing facts or documents. Check that the corporate name, home registration number, representative, French address and activity description match across every document.
3. Prepare a dated evidence pack with a contents page, the current registry extract, the corporate decision, address evidence, identity and beneficial-owner information, and the certified French translation or authentication required for the document.
4. Answer in the existing file or through the channel named by the authority. Keep the submission receipt and do not open a duplicate formalities file merely to obtain a different tracking number.
5. If the answer affects a pending contract, employee start date, bank account or tax filing, tell the counterparty exactly what is pending and give the evidence that is already available. Do not represent a SIRET as a VAT number or a pending file as a completed registration.

A formal refusal can sometimes be challenged or corrected, but the remedy depends on who refused the file and why. Article L. 123-3 allows the judge to order a registered person to make the required registration or amendment; the provision states that « le juge peut enjoindre, le cas échéant sous astreinte » the person to make the required formalities. Read the current text on Légifrance, Article L. 123-3. That legal route is not a substitute for answering a routine missing-document request, but it explains why a carefully documented refusal should not simply be abandoned.

The most frequent operational errors are avoidable: using the parent’s foreign number in a French establishment field, describing a branch as a subsidiary, filing an untranslated corporate extract, omitting the beneficial-owner chain, giving a domiciliation address with no evidence of the right to use it, or treating an assigned SIRET as proof that VAT is active. Correct those errors before the company sends the identifier to customers, banks, payroll providers or electronic-reporting software.

Conclusion

A foreign company can often obtain a French SIRET without creating a French subsidiary, but the correct route follows the real French activity. A branch or qualifying establishment may be registered while the foreign parent keeps its original legal personality. A company with no permanent establishment may still need an RNE record, a VAT registration, an employer process or e-reporting compliance. The number itself does not answer those questions.

Before filing, document the French premises, people, contracts, stock, services and start date. Decide whether the presence is a liaison office, a branch, an establishment or a French subsidiary. Prepare the home-country registry evidence, constitutional documents, corporate authority, beneficial-owner information, address proof, translation and authentication in one coherent file. After filing, preserve the Guichet receipt and separate the SIREN, SIRET, RCS, RNE, SIRENE, Kbis and VAT evidence. After assignment, reconcile the number with tax, URSSAF, payroll, invoicing and e-reporting obligations. When the facts change, update or close the establishment within the applicable time limit. This process gives a foreign board a usable French identifier without pretending that registration alone resolves tax, employment or regulatory exposure.

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