You run a French company from abroad, the accountant mentions a missed acompte, and a few weeks later the tax office claims a 5% surcharge plus monthly interest. Panic is understandable, but this situation follows strict written rules, and two French appeal courts have already decided the exact disputes foreign founders raise most often. This article explains, in English and with the official texts, how corporate tax instalments work in France, what a late or short payment really costs, and the practical steps that fix the problem and prevent the next one.

French corporate tax is called impôt sur les sociétés, usually shortened to IS. It is paid in advance in four instalments (acomptes), then balanced once the year’s profit is known (relevé de solde). The standard rate is set by statute: “Le taux normal de l’impôt est fixé à 25 %.” Because the system is self-assessed, the company itself computes and pays each instalment without waiting for a tax bill, and because each deadline is a legal due date, a plain missed instalment exposes the company to both a surcharge and late interest, even when the full year’s tax is eventually paid. Narrow statutory exceptions exist, for instance where the taxpayer flagged the point expressly on the return, “par une indication expresse portée sur la déclaration ou l’acte, ou dans une note annexée”, or where a small understatement stays within tolerance, “lorsque l’insuffisance des chiffres déclarés n’excède pas le vingtième de la base d’imposition en ce qui concerne l’impôt sur le revenu et l’impôt sur les sociétés”, but simply paying late falls outside them. The good news is that the correction path is equally mechanical: pay the shortfall spontaneously, file the balance on time, and secure next year’s calendar. Readers who need the wider picture first can start with our overview of French corporate tax for foreign owners, from the 25% rate to branch versus subsidiary, then use this guide for the missed-instalment emergency.

I. When a Foreign-Owned French Company Must Pay Corporate Tax Instalments and How the Balance Is Settled

A. The Four Instalment Dates, the First-Year Exemption, and the Self-Assessed Payment Slip

Every company liable for French corporate tax, including a SAS or SARL held entirely by non-residents, pays its tax in quarterly instalments computed from the last closed financial year. The statute states: “L’impôt sur les sociétés donne lieu au versement, au comptable public compétent, d’acomptes trimestriels déterminés à partir des résultats du dernier exercice clos.” The same article fixes four hard deadlines: “Les paiements doivent être effectués au plus tard les 15 mars, 15 juin, 15 septembre et 15 décembre de chaque année.” These dates apply regardless of where the shareholders or the president live, because the taxpayer is the French company itself, acting through its legal representative and its accountant before the local business tax office, the service des impôts des entreprises (SIE), a branch of the Direction générale des finances publiques (DGFiP, the French tax administration).

Two relief valves inside the same article matter most to foreign founders, alongside other special regimes the same article organises for small bodies and very large turnovers. First, a newly created company gets breathing room: “Les sociétés nouvellement créées ou nouvellement soumises, de plein droit ou sur option, à l’impôt sur les sociétés sont dispensées du versement d’acomptes au cours de leur premier exercice d’activité ou de leur première période d’imposition arrêtée conformément au deuxième alinéa du I de l’article 209”. If your SAS was registered this year, no instalment is due yet, which surprises many founders who receive alarming reminder letters generated automatically. Second, a company that has already paid enough may stop paying: the administrative appeal court of Marseille recalls the rule in these terms, “L’entreprise qui estime que le montant des acomptes déjà versés au titre d’un exercice est égal ou supérieur à la cotisation totale d’impôt sur les sociétés dont elle sera redevable au titre de l’exercice concerné, avant imputation des crédits d’impôt, peut se dispenser de nouveaux versements d’acomptes.” Note the trap hidden in that sentence, confirmed by the same ruling: the comparison is made before tax credits, so a founder counting on research credits or sponsorship reductions to justify skipping an instalment is making exactly the mistake the courts punish, as shown below.

The payment itself is made spontaneously by the company, with a standard slip, and sent to the tax office of the place of taxation. The implementing regulation provides: “Les acomptes mentionnés au 1 de l’article 1668 du code général des impôts sont calculés par le redevable et versés spontanément au comptable de la direction générale des finances publiques du lieu d’imposition défini à l’article 218 A du même code.” In practice the accountant prepares the standard instalment slip and pays the amount spontaneously to the DGFiP accountant: “Chaque versement est accompagné d’un relevé fourni par l’administration, daté et signé de la partie versante et indiquant la nature du versement, son échéance, les montants à payer ainsi que la désignation et l’adresse du principal établissement de l’entreprise.” A foreign founder should therefore check two very concrete things the day a problem appears: was the instalment slip actually filed for the disputed quarter, and was the payment received by the competent accountant by the 15th. Many missed-instalment cases are born in that gap between the accountant clicking file and the bank executing the transfer, especially when instructions travel across time zones and the signatory is abroad.

Each instalment normally equals one quarter of the tax computed on the last known results, with a regularisation mechanism when a new financial year closes between two due dates. The Marseille court describes it precisely: the results used as the base are those of the previous year, and an instalment falling between the closing date and the filing deadline is computed provisionally on the older known results, then adjusted at the next payment. For a foreign shareholder this means the March instalment of year N very often rests on year N-2 figures and is corrected in June once year N-1 is declared. Underpaying March because the company looked dormant, then forgetting the June catch-up, is the single most common path to the penalties examined in Part II.

B. The Year-End Balance: Tax Return, Payment Slip, and Possible Refund Within Thirty Days

Once the financial year closes, the company declares its profit and settles the difference between the tax finally due and the four instalments already paid. Companies liable for corporate tax must file the annual result: “Les personnes morales et associations passibles de l’impôt sur les sociétés sont tenues de souscrire les déclarations prévues pour l’assiette de l’impôt sur le revenu en ce qui concerne les bénéfices industriels et commerciaux”. That declaration is the annual results declaration with its appendices, and it sets the base on which the balance is computed.

The balance itself is self-assessed on a second standard slip: the regulation states that the settlement “est réalisée par le redevable et détaillée sur un relevé de solde”, the balance slip (relevé de solde): “S’il résulte de cette liquidation un complément d’impôt, il est acquitté lors du dépôt du relevé de solde au plus tard le 15 du quatrième mois qui suit la clôture de l’exercice.” “Si l’exercice est clos au 31 décembre ou si aucun exercice n’est clos en cours d’année, le relevé de solde est à déposer au plus tard le 15 mai de l’année suivante.” If a complement is due, it is paid with that slip; if the instalments overshoot the final tax, “l’excédent, défalcation faite des autres impôts directs dus par l’entreprise, est restitué dans les trente jours à compter de la date de dépôt du relevé de solde et de la déclaration prévue au 1 de l’article 223.” For a foreign-owned company this thirty-day refund rule is worth knowing, because overpaying deliberately to dodge the underpayment penalties described below simply parks cash with the Treasury for months, while calibrated instalments keep the money in the business.

Late filing of the annual declaration carries its own sanctions, separate from late payment, since the law punishes the failure to file on time anything that states items used for the base or the computation of the tax: “Le défaut de production dans les délais prescrits d’une déclaration ou d’un acte comportant l’indication d’éléments à retenir pour l’assiette ou la liquidation de l’impôt entraîne l’application, sur le montant des droits mis à la charge du contribuable ou résultant de la déclaration ou de l’acte déposé tardivement, d’une majoration de : a. 10 % en l’absence de mise en demeure ou en cas de dépôt de la déclaration ou de l’acte dans les trente jours suivant la réception d’une mise en demeure d’avoir à le produire dans ce délai ; b. 40 % lorsque la déclaration ou l’acte n’a pas été déposé dans les trente jours suivant la réception d’une mise en demeure d’avoir à le produire dans ce délai”. A foreign founder facing both a missed instalment and a late annual declaration therefore faces two stacks of charges running on different legal bases, 5% plus monthly interest on the payment side and 10% rising to 40% on the filing side, which is why the fix must cover payment and filing together, as Part II explains.

II. What a Missed Instalment Costs and How a Foreign Founder Fixes It

A. The 5% Surcharge and the Monthly Interest: Two Appeal Rulings Every Foreign Founder Should Read

Late payment of corporate tax triggers two charges at once: a flat surcharge and interest running month by month. The surcharge rule reads: “Donne lieu à l’application d’une majoration de 5 % tout retard dans le paiement des sommes qui doivent être versées aux comptables de l’administration fiscale au titre des impositions autres que celles mentionnées à l’article 1730”. Corporate tax falls into that residual category, so any late instalment draws the 5% increase on the amount paid late. On top of it runs late interest on every tax debt not paid by the legal deadline: “Toute créance de nature fiscale, dont l’établissement ou le recouvrement incombe aux administrations fiscales, qui n’a pas été acquittée dans le délai légal donne lieu au versement d’un intérêt de retard.” The rate is statutory and identical for every taxpayer: “Le taux de l’intérêt de retard est de 0,20 % par mois.” The clock starts “à compter du premier jour du mois suivant celui au cours duquel l’impôt devait être acquitté jusqu’au dernier jour du mois du paiement”, so a March instalment paid in May accrues interest from 1 April to 31 May, plus the 5% surcharge on the late amount.

The first ruling to read is that of the administrative appeal court (cour administrative d’appel, CAA) of Marseille of 21 December 2018, number 18MA00667, concerning a company taxed at over one million euros for 2011 that had paid its four instalments in full by year end but short-paid the first two. The court reconstructed the arithmetic quarter by quarter and concluded: “c’est à bon droit que l’administration fiscale a appliqué la majoration de 5 % prévue à l’article 1731 du code général des impôts et des intérêts de retard prévus à l’article 1727 du même code, au regard de l’insuffisance de deux premiers acomptes exigibles les 15 mars et 15 juin 2011.” Paying everything by December did not erase the March and June shortfalls, the modulation defence failed because the company had not actually covered the full year’s liability when it skipped ahead, and the operative part is blunt: “La requête de la SARL Promocom est rejetée.” For a foreign founder, the lesson is direct: each instalment deadline is judged on its own, catching up later stops the interest clock but never cancels the 5% already incurred, and invoking the stop-paying option only works when the instalments already made truly cover the whole year’s bill before credits.

The second ruling is even more recent and destroys the most tempting excuse. On 7 January 2026 the Paris appeal court, number 24PA05225, decided the case of a well-known sports company reassessed for about 563,000 euros of corporate tax plus some 60,000 euros of late interest, which argued that its unused sponsorship reduction and competitiveness tax credit, larger than the reassessment, meant the Treasury had suffered no harm. The court restated the principle first: “Le retard de paiement donnant lieu à l’application de l’intérêt de retard s’apprécie en fonction de la date d’exigibilité de chaque impôt ou de chacune des composantes du même impôt.” It then rejected the credit argument on the ground that the statute targets the full tax claims established or recovered by the administration, not the net amount that would have remained after deducting unclaimed carry-forward credits, so holding usable credits changes nothing when they were never set against that year’s liability. Result: “La requête de la SASP PSG Football est rejetée.” A foreign founder sitting on French tax credits while an instalment goes unpaid should therefore expect exactly the same answer: unclaimed credits do not backdate themselves onto a missed deadline.

Put together, the two decisions draw a clear map of what works and what does not before the tax judge (tribunal administratif at first instance, then the cour administrative d’appel). Defences succeed only on exact quarterly arithmetic and on the statutory modulation test decided in Marseille, while arguments based on later full payment or on unused, unclaimed credits do not move the court, as both rulings show. Any challenge must therefore start from the bank statements and the filed slips, not from fairness arguments, and must be aimed at the correct amount rather than at the principle of the charges.

B. The Practical Fix: Pay the Shortfall Now, File the Balance Cleanly, and Lock In Next Year’s Calendar

Step one is to stop the interest clock the same day the problem is discovered. Compute the missing amount per instalment with the accountant, file the missing instalment slip at once, and pay the shortfall immediately to the competent public accountant, keeping proof of payment. Every month boundary crossed adds another 0.20%, so a shortfall found on the 28th should never wait until the 5th. Step two is to check the 5% surcharge notice line by line against the slips: the surcharge applies per late instalment on the late amount, and errors in allocating a payment to the wrong quarter are common when a founder wires money with a vague reference. If the allocation is wrong, ask the SIE in writing for reallocation with the payment proofs attached before discussing anything else.

Step three is to secure the year-end balance so the file shows one isolated incident instead of a pattern. File the annual results declaration on time, compute the balance slip carefully, and pay any complement by its own deadline, because a late balance would stack a second round of 5% and interest on top of the instalment charges, plus the 10% late-filing increase on the declaration itself. Where the instalments overshoot, claim the thirty-day refund mechanically rather than leaving the credit to drift. Step four concerns the modulation option for the current year: it may be used only when the instalments already paid genuinely equal or exceed the full estimated liability before credits, exactly as the Marseille court framed it. As a matter of good practice, have the accountant prepare and keep a dated supporting computation with the company’s tax file, so the basis of the estimate can be shown contemporaneously rather than reconstructed afterwards.

Step five is organisational and prevents recurrence, which is where foreign ownership usually fails. Put the four statutory dates, 15 March, 15 June, 15 September and 15 December, into a shared calendar with a ten-day advance alert for the accountant and a three-day alert for the bank signatory, with a named backup signatory for holiday periods. Give the accountant a SEPA direct-debit mandate or standing transfer instructions so payment does not depend on the founder being awake in another time zone. Reconcile every quarter: slip filed, amount debited, value date on or before the 15th, allocation to the right quarter, and written confirmation archived. New companies should diary the end of the first-year exemption, because the first instalment of year two arrives fast and is computed on year-one profit, which founders routinely underestimate after a strong first year. Finally, keep the two appeal rulings above in the file: showing a bank, an investor, or a incoming director that the charges follow published case law, rather than negotiation, shortens every discussion about who pays for the mistake.

The regularisation mechanism deserves one more concrete illustration, because it is where foreign-held companies most often drift. Suppose the March instalment was computed on year N-2 profit because year N-1 had not yet been declared, and year N-1 then turns out far more profitable. The June instalment must catch up the difference so that the first two quarters together match one half of the tax on the year N-1 base. The Marseille judges performed exactly that recomputation, quarter by quarter, before upholding the charges on the resulting shortfall. An accountant serving a foreign client should therefore send, every June, a one-page reconciliation showing the base used in March, the newly declared base, and the catch-up amount paid, with the filing proof and the payment proof. That single page defeats most disputes at the claim stage, long before any judge sees the file.

Both rulings also teach a procedural lesson about costs. In Marseille the court expressly refused to charge the State with any sum for legal expenses, “qui n’est pas la partie perdante dans la présente instance”, and in Paris the costs claim under article L. 761-1 of the administrative justice code was rejected as a consequence of the dismissal, “il y a lieu de rejeter également ses conclusions présentées sur le fondement de l’article L. 761-1 du code de justice administrative”. A foreign founder should therefore budget litigation as a cost centre with no guaranteed recovery, and should treat the administrative claim and court appeal as a way to correct a wrong amount rather than as a way to punish the administration for applying the statute. The realistic win is a recomputed base, for example where a payment was allocated to the wrong quarter or where the provisional March instalment was never regularised on the correct prior-year profit, and not a declaration that the surcharge system itself is unfair.

Conclusion

A missed corporate tax instalment in France is a mechanical event with mechanical consequences: each quarterly deadline stands alone, the 5% surcharge attaches to every late amount, monthly interest at 0.20% runs until actual payment, and neither catching up by year end nor holding unused tax credits erases the charges, as the Marseille and Paris appeal courts have each confirmed with a straight rejection. The fix is equally mechanical and entirely within a foreign founder’s reach: pay the shortfall at once with the correct slip, verify the allocation to the right quarter, file the annual declaration and the balance cleanly, use the stop-paying option only with a documented full-coverage estimate, and wire next year’s four dates into the company’s routines with backup signatories. Handled this way, one missed acompte stays a line item instead of becoming a dispute, and the French company keeps the clean tax record that banks, landlords, and future buyers all ask to see.

Need a quick opinion on your case

Facing a missed instalment, a surcharge notice, or a disputed balance for your French company? Our firm offers a consultation by telephone within 48 hours with an attorney of the firm. Call +33 6 46 60 58 22 or reach us through our contact page, and keep your payment slips and proof-of-payment documents ready for the call.