You live in London, Dubai or New York. Your French company, a SAS (société par actions simplifiée, the flexible limited company most foreign founders choose) or a SARL (société à responsabilité limitée, the more rigid private limited company), runs its daily business in Paris, Lyon or Bordeaux without you. Then an email from your accountant lands in your inbox: the French tax administration has announced a vérification de comptabilité, a full on-site audit of the company’s books. A few weeks later, a second letter arrives at the company’s registered office, the siège social: URSSAF (the network of agencies that collects French social security contributions from employers) wants to inspect your payroll. Two audits at once, an ocean away from you, each with its own procedure, its own deadlines and its own bill at the end. This guide explains, in English and in practical terms, how each control works, which papers the inspectors must send you before they can touch a euro, and exactly how you challenge a tax reassessment or a social security bill from abroad before the time limits close the door.

French audit law looks intimidating because everything is written in dense administrative French. Its logic, however, is protective: no audit without prior written notice, no reassessment without a reasoned document you are invited to answer, and no final bill without an independent judge at the end of the road. The trap for foreign owners is never the substance of the tax rules. It is the calendar. Almost every right in this article dies if you exercise it late: the reply to the tax inspector, the formal tax claim, the objection to the URSSAF collectors, the appeal to the court. Read this article with a pen and mark every deadline. If you take only one message from these pages, take this one: the day a French audit letter reaches your siège social, forward it to your French adviser the same day, because several clocks start running on receipt, whether you are in France or not.

I. The audit itself: what French inspectors can and cannot do to your company

France runs two separate audit machines, and a foreign-owned company can meet both in the same year. The tax inspector works for the DGFIP (Direction générale des finances publiques, the French tax authority) through your local SIE (service des impôts des entreprises, the corporate tax office). The social inspector works for URSSAF (union de recouvrement des cotisations de sécurité sociale et d’allocations familiales, the agency collecting employer social contributions). Each follows a written adversarial procedure, called contradictoire, which means the administration must show you what it criticises and hear your answer before it bills you. Understanding each track is the condition for defending yourself on either.

A. The tax audit (vérification de comptabilité): the notice, the charter and the adversarial reassessment procedure

A tax audit of your company never starts with a surprise visit to the accounts. The law states that a verification of accounts cannot be started unless the taxpayer has been informed by the sending or delivery of an audit notice, and in the original French that notice obeys strict content rules: “Cet avis doit préciser les années soumises à vérification et mentionner expressément, sous peine de nullité de la procédure, que le contribuable a la faculté de se faire assister par un conseil de son choix.” In plain English: the avis de vérification must tell you which financial years are inspected and must expressly remind you, on pain of annulment of the whole procedure, that you may be assisted by an adviser of your choice. It also tells you that the taxpayer’s charter, the charte des droits et obligations du contribuable vérifié, is available online or on request. From abroad, this notice is your first alarm bell. Check the years covered, check that the counsel warning appears, and appoint your French accountant (expert-comptable) or tax lawyer as your representative immediately, because the inspector will deal with whoever is physically present and every statement made during the audit counts.

Do not confuse the full on-site audit with its lighter cousin, the desk audit or contrôle sur pièces, where the tax office simply asks for documents by mail without visiting your premises. The desk audit follows a simpler exchange of letters, while the vérification de comptabilité means the inspector comes to the company’s offices, sometimes for weeks. Small companies enjoy a precious statutory shield here: “Sous peine de nullité de l’imposition, la vérification sur place des livres ou documents comptables ne peut s’étendre sur une durée supérieure à trois mois en ce qui concerne” businesses below the turnover thresholds set by law. In other words, for a small operating company, the on-site presence of the inspector cannot legally drag beyond three months, failing which the resulting assessment is void. The three-month cap does not cover the later stages, such as the examination of your written observations after the fieldwork ends, but it stops the inspector from camping in your offices indefinitely. If your French subsidiary is still small, count the days of on-site presence from the first visit. If the inspector is still examining books on your premises in month four, your counsel should already be drafting the nullity argument.

During the audit the inspector reviews everything that feeds French business taxation: corporate income tax (IS, impôt sur les sociétés), value added tax (TVA, taxe sur la valeur ajoutée, the French VAT), payroll withholding, and the consistency between your filed returns and your accounting software. Our companion guide on French VAT registration, invoicing and refunds for foreign-owned companies explains why VAT is the single most frequent source of reassessment for newcomers: wrongly applied rates, missing intra-EU declarations and foreign invoices without the required mentions. Keep in mind that the inspector may also look sideways at the individuals behind the company. Dividends, shareholder current accounts (comptes courants d’associés, the loans shareholders make to their own company) and director pay frequently migrate from the company’s audit into personal reassessments, which is why our guides on how a foreign director gets paid and which social security applies and on setting up a company in France as a foreign founder belong on the same shelf as this one.

The audit ends in one of two ways. Either the inspector found nothing and sends a notice of no reassessment, and you can breathe. Or the administration considers that your returns understated the tax due, and it must then follow the adversarial reassessment procedure, the procédure de rectification contradictoire. The statute frames it plainly: “les rectifications correspondantes sont effectuées suivant la procédure de rectification contradictoire définie aux articles L. 57 à L. 61 A.” Concretely, you receive a proposition de rectification, a reasoned letter stating each adjustment, its legal basis and its amount, and you are invited to accept or to reply with observations. The governing article says: “L’administration adresse au contribuable une proposition de rectification qui doit être motivée de manière à lui permettre de formuler ses observations ou de faire connaître son acceptation.” Motivation here is not decoration. The courts require the administration to state, in that letter, the grounds and amounts of the planned increases, their legal basis, the income category and the years concerned. The administrative court of appeal of Marseille put it this way: “l’administration doit indiquer au contribuable, dans la proposition de rectification, les motifs et le montant des rehaussements envisagés, leur fondement légal et la catégorie de revenus dans laquelle ils sont opérés, ainsi que les années d’imposition concernées” (CAA Marseille, 21 December 2023, no. 22MA00881). A vague letter that merely asserts you owe more, without figures, legal references and years, is vulnerable to annulment, and your reply should say so politely but firmly.

Your reply matters twice: it can convince the inspector to drop points, and it locks in your arguments for the later court stage. The basic reply period is thirty days, and the same article adds that on the taxpayer’s request received before expiry, the period is extended by thirty days, in the French words “Sur demande du contribuable reçue par l’administration avant l’expiration du délai mentionné à l’article L. 11 , ce délai est prorogé de trente jours.” From abroad, send the extension request immediately by a traceable channel and use the extra month to gather invoices, contracts and bank statements, because once the inspector answers your observations, the reassessment becomes final and only formal appeals remain. Also weigh the penalties from the start. Beyond the extra tax, the code provides that inaccuracies trigger a surcharge of “40 % en cas de manquement délibéré”, deliberate failure, rising to “80 % en cas de manœuvres frauduleuses”, fraud, plus late interest. Contesting the penalty rate is often as valuable as contesting the principal: showing good faith, first-time error and spontaneous cooperation can move the file from the 40 percent bracket back to simple interest. The tax authority’s own professional guidance confirms that during the control you may ask for hierarchical review, first by the inspector’s line manager and then by a specially appointed interlocutor, and that senior review can narrow or close points before any formal claim, as explained on the impots.gouv.fr page on remedies during a tax control. Use that ladder. A calm technical meeting in Paris, handled by your counsel while you join by video, resolves more files than angry letters ever will.

B. The URSSAF control: the notice, the observation letter and the recovery documents

The URSSAF control is the social twin of the tax audit, and for a company hiring in France it is statistically the more likely visit. Its legal mission is defined by statute: the control of employers’ compliance with social security law is entrusted to the collection agencies, in the French terms of article L. 243-7 of the Social Security Code. In practice the inspector checks that salaries, bonuses, benefits in kind, director pay and contractor invoices were correctly subjected to employer and employee contributions, and that the exemptions and reduced rates your payroll applied were genuinely available. If you hired your first French employee recently, read this section together with our guide on hiring, contracting, paying and declaring that first employee while living abroad, because most URSSAF reassessments against young foreign-owned companies come from three classics: a contractor who looks like a disguised employee, a benefit in kind never declared, and a director’s pay routed through the wrong contribution scheme.

Like the tax audit, the URSSAF control cannot start silently. The regulation provides: “Tout contrôle effectué en application de l’article L. 243-7 est précédé, au moins trente jours avant la date de la première visite de l’agent chargé du contrôle, de l’envoi par l’organisme effectuant le contrôle des cotisations et contributions de sécurité sociale d’un avis de contrôle.” The avis de contrôle must reach the company’s legal representative at the registered office at least thirty days before the inspector’s first visit, and it refers to the charte du cotisant contrôlé, the audited contributor’s charter describing each step and each right. Only undeclared-work investigations, the travail dissimulé cases, may start without that advance notice. When the letter arrives at your siège social, verify the date math: a visit announced twenty days ahead is procedurally fragile. Then prepare exactly as for a tax audit, with one addition specific to payroll: pull every employment contract, payslip, contractor agreement, expense report and proof of working time for the inspected years, because the inspector will sample them and extrapolate.

At the end of the fieldwork the inspector sends the central document of the whole procedure, the lettre d’observations, listing each planned reassessment and each observation for the future. The Cour de cassation, the supreme court for private-law matters, recently restated the core timing rule: “Selon l’article R. 243-59 du code de la sécurité sociale, dans sa rédaction applicable au litige, à compter de la réception de la lettre d’observations par la personne contrôlée, celle-ci dispose d’un délai de trente jours pour y répondre.” (Cass. civ. 2e, 4 December 2025, no. 23-16.340). Thirty days from receipt to answer, point by point, with evidence. Note the trap the same decision illustrates: an informal extra delay granted by the inspectors to complete your reply does not automatically push back the legal starting point of recovery, so never treat a friendly extension as a suspension of the procedure. Answer within the thirty days even if discussions continue afterwards, and state expressly which heads of reassessment you accept and which you contest, because silence reads as agreement.

What follows depends on your answer. If the observations only concern future practice, URSSAF sends a confirmation closing the file. If money is claimed, it sends a mise en demeure, a formal demand stating the exact sums of contributions, surcharges and penalties, which you must pay within thirty days of receipt according to the official URSSAF control page, unless you challenge it through the remedies described below. If the formal demand stays unpaid, the agency may issue a contrainte, an enforceable order served by a bailiff (commissaire de justice, formerly huissier de justice) or by registered letter, which can lead to seizure without a prior court judgment. The contrainte is a fearsome paper, but it is fenced by strict formalities: it must mention the reference and amount of the order, the time limit for objection, the address of the competent court and the required form of referral, failing which it is void. Any objection, called opposition à contrainte, must then be filed by registered letter to the court clerk “dans les quinze jours à compter de la notification ou de la signification. L’opposition doit être motivée ; une copie de la contrainte contestée doit lui être jointe.” Fifteen days, reasoned, with a copy of the order attached. Miss it and the order becomes final. One more warning for foreign owners tempted by aggressive payroll optimisation: where undeclared work is formally recorded, the code wipes out your contribution reductions and exemptions, under article L. 133-4-2 of the Social Security Code, which can multiply the bill far beyond the missing contributions. Keep every hiring declaration, every DPAE (déclaration préalable à l’embauche, the mandatory pre-hiring declaration) and every contractor invoice, because in contribution disputes the paper you kept is the case you win.

II. Challenging the bill from abroad: objections, appeals and court action before the deadlines expire

Receiving a reassessment is not the end of the story. It is the start of a second procedure, the challenge procedure, where the foreign owner’s distance changes nothing about the rights available but changes everything about organisation. French challenge routes are layered: first convince the administration itself through observations, senior reviewers and formal claims, then, if the administration holds its ground, ask a judge. Each layer has its own clock, and the layers must be taken in order. The most common fatal error we see from abroad is skipping a mandatory preliminary step and filing directly with the court, which declares the case inadmissible and lets the bill stand. Follow the ladder rung by rung.

A. How to answer, escalate and formally claim: observations, senior reviewers, tax claims and the friendly-appeals commission

On the tax side, your first weapon is the written reply to the proposition de rectification described above: thirty days, extendable by thirty on timely request, addressed point by point to the inspector’s reasoning. Attach the missing invoices, the contracts proving the business purpose of an expense, the bank statements proving payment, the transfer-pricing documentation if the adjustment concerns dealings with your foreign parent. If disagreement persists after the inspector’s answer, climb the internal ladder documented by the tax authority itself: meet the inspector’s line manager, then the appointed interlocutor, who re-examines the file with fresh eyes, as described on the official remedies page. These meetings are not court hearings. They are technical discussions where a well-prepared file, presented in clear French by your counsel, regularly halves the reassessment. For complex valuation or accounting disputes, a specialised body, the commission des impôts directs et des taxes sur le chiffre d’affaires, can also be asked to give an opinion, which the administration often follows in practice.

If the administration confirms the reassessment, the next rung is the formal claim, the réclamation contentieuse. The statute gives it a wide scope: “Les réclamations relatives aux impôts, contributions, droits, taxes, redevances, soultes et pénalités de toute nature, établis ou recouvrés par les agents de l’administration, relèvent de la juridiction contentieuse lorsqu’elles tendent à obtenir soit la réparation d’erreurs commises dans l’assiette ou le calcul des impositions, soit le bénéfice d’un droit résultant d’une disposition législative ou réglementaire.” In everyday terms, you write to the tax office asking it to cancel or reduce the assessment because the base was wrong or the law was misapplied, and that letter opens the path to the judge if the office refuses. Watch the filing deadline with extreme care, because it is a limitation period, not a suggestion: “Pour être recevables, les réclamations relatives aux impôts autres que les impôts directs locaux et les taxes annexes à ces impôts, doivent être présentées à l’administration au plus tard le 31 décembre de la deuxième année suivant celle, selon le cas” of collection, payment or the triggering event. A reassessment collected in 2025 must therefore generally be claimed by 31 December 2027. File by registered letter with acknowledgment of receipt or through the company’s online professional account, keep the proof of filing, and diary the administration’s six-month reply period: silence for six months counts as an implied rejection and opens the court door, which is the subject of the next section.

Practical caution for the foreign owner: filing the claim does not by itself freeze collection. The assessment remains payable while you argue, unless you separately secure a stay backed by guarantees, which your counsel should arrange at the same time as the claim. Never let a reassessment sit unpaid without either a formal stay or a payment plan, because penalties and enforcement costs accumulate while the file sleeps. And keep paying your current taxes normally during the dispute. Nothing weakens a good faith argument faster than fresh arrears appearing while you contest old ones.

On the URSSAF side, the ladder is shorter but just as strict. First, answer the lettre d’observations within thirty days, as the Cour de cassation requires. Second, if the mise en demeure or the confirmation of observations maintains the bill, challenge it before the CRA (commission de recours amiable, the friendly-appeals commission) of your URSSAF office. This preliminary appeal is free, filed online, and mandatory before any court: the statute states that “Les recours contentieux formés dans les matières mentionnées aux articles L. 142-1 , à l’exception du 7°, et L. 142-3 sont précédés d’un recours préalable, dans des conditions prévues par décret en Conseil d’Etat.” The official URSSAF guidance confirms you have two months from notification of the contested decision to seize the commission, and that the commission procedure costs nothing and requires no personal attendance. File the CRA appeal by registered letter or through the online account, attach your observations and evidence, and state each ground separately: wrong legal characterisation of a bonus, benefit in kind overvalued, contractor wrongly reclassified, exemption wrongly denied. A frequent winning line for foreign-owned companies is the genuine independence of a contractor who works for several clients, sets his own hours and uses his own equipment, documented by contracts and invoices; a frequent losing line is asserting independence with no paper at all. If the CRA rejects the appeal expressly or stays silent, the court stage opens. Meanwhile, if a contrainte arrives, remember the fifteen-day opposition rule quoted above and act within days, not weeks, because the bailiff’s calendar does not wait for international mail.

B. Going to court from abroad: which judge hears you, how to file, and how to stop enforcement

Tax disputes and social disputes go to different judges, and sending your case to the wrong court is the classic way to lose on procedure. Tax reassessments, once the formal claim is rejected expressly or implicitly, belong to the administrative court, the tribunal administratif of the place where the tax office sits. The time limit is short: “La juridiction ne peut être saisie que par voie de recours formé contre une décision, et ce, dans les deux mois à partir de la notification ou de la publication de la décision attaquée.” Two months from the rejection decision. Your petition must attach the claim, the rejection, the reassessment notices and every piece of evidence, translated where necessary, and it must repeat every ground already raised in the claim, because new grounds raised for the first time before the judge face admissibility hurdles. The strongest substantive lines, in our experience with foreign-owned companies, are procedural defects (missing counsel warning in the audit notice, vague proposition de rectification that fails the motivation test the Marseille court restated), wrong legal characterisation (a genuine business expense treated as a hidden profit distribution), and penalty challenges (good faith negating the 40 percent surcharge). If the tribunal rules against you, appeal lies to the administrative court of appeal and then, on points of law, to the Conseil d’État, each with its own two-month clock. Budget for duration: a full tax case commonly spans years, which is precisely why the administrative settlement rungs above deserve your best efforts first.

Social disputes belong to the judicial courts, specifically the social division, the pôle social, of the judicial tribunal (TJ, tribunal judiciaire). After the mandatory CRA stage, you summon URSSAF before that court, and for contrainte cases you file the fifteen-day opposition directly with its clerk. Foreign owners should note the territorial rule the regulation writes for them: debtors living abroad file with the court of the collecting agency’s area, since the text directs them, in French, to the clerk of the competent court for the agency’s district, “pour les débiteurs domiciliés à l’étranger, au secrétariat du tribunal compétent dans le ressort de l’organisme créancier”. In practice your French lawyer handles filing, service and hearings while you provide statements and documents from abroad; personal attendance is rarely required at first instance. Ask the court, where available, for payment scheduling (délais de grâce) if the principal is due but cash is tight, and separately ask URSSAF for a payment plan and a remission of late surcharges, because collection agencies routinely grant facilities to debtors who engage early and document their cash position. What you must never do is ignore a contrainte hoping distance protects you: it is enforceable, it carries provisional execution, and the judge’s decision on opposition is itself immediately enforceable.

Three organisational habits decide, more than legal talent, whether a foreign owner wins or loses these cases. First, centralise French mail. Every deadline in this article runs from notification to the siège social or from the bailiff’s service, not from the day you happen to read the letter. A domiciliation provider that scans daily, an accountant with a mandate to receive copies, or a lawyer with an election of domicile turns distance from a trap into a non-issue. Second, keep French-language evidence as events happen, not when the inspector calls: contracts, invoices with the mandatory mentions, proof of payment, working-time records, contractor independence files. Reconstructing three years of payroll evidence from abroad under a thirty-day deadline is how good cases die. Third, instruct one French coordinator, typically the expert-comptable for figures and the avocat for procedure, with written powers to request extensions, attend meetings and file appeals. Inspectors and judges both accommodate represented foreign parties generously; they accommodate silence never.

Conclusion

A French tax audit and an URSSAF control arriving together feel like a storm, but they are a navigable one. Both procedures are written, adversarial and deadline-driven: a prior notice you can check, a reasoned document you can answer, senior reviewers you can meet, a formal claim or commission appeal you can file, and finally a judge who annuls defective assessments. The foreign owner’s disadvantage is purely logistical, and logistics can be bought: same-day forwarding of every French letter, a thirty-day reply discipline on both the tax and social tracks, systematic challenges to vague reasoning and excessive penalties, and a French representative empowered to act while you sleep in another time zone. Companies that follow this discipline usually settle or win on at least part of the bill. Companies that learn the deadlines after they expire pay the full amount plus the lesson. If the inspector’s letter is already on your desk, start today: confirm the notice’s validity, calendar every time limit in this article, and get your reply drafted within the thirty days. The French system rewards the diligent contradiction it promises on paper, including for owners who run their French company from the other side of the world.

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