You formed your company in France from London, New York, Dubai or Singapore, you received the Kbis (the official company identity certificate issued by the greffe, the registry of the commercial court), you opened the bank account, and business started. Then a new set of letters arrives from the French tax administration (the DGFIP, Direction générale des finances publiques): corporate income tax, in French impôt sur les sociétés, universally shortened to IS. How much do you owe, when do you file, how do you pay from a foreign bank account, what happens if you pay late, and above all what do you do when the tax office sends a reassessment proposal while you live thousands of kilometres away? This guide answers those questions in the order a foreign founder actually meets them. It explains every French acronym on first use, it gives you the exact filing and payment calendar, and it shows you how experienced counsel defends an IS reassessment without you flying to France. The companion hub for the whole setting-up sequence, from bank account to Kbis to VAT to first hire, is our guide to setting up a company in France as a foreign founder; this article takes over where that hub stops and follows your company into its yearly tax life.
French corporate tax looks simple from the outside: one rate, one return, four instalments. The difficulty for a foreign-owned company is never the arithmetic. It is the calendar, the proof, and the distance. Returns filed late because nobody monitored the French mailbox, instalments missed because the foreign bank rejected the SEPA direct debit, charges rejected because the supporting document stayed in the founder’s home country, and reassessments accepted by silence because the 30-day reply period expired before anyone translated the letter. Each of those failures is avoidable once you understand the mechanism. This article follows two movements: first, how your company files and pays IS correctly from abroad, and second, how you fight back when the administration reassesses it.
I. How your French company pays corporate tax from abroad: return, instalments and deadlines
Paying IS correctly from abroad is a matter of organisation, not of tax science. Once you know which companies the tax catches, where France taxes the profit, which rate applies, when the return must reach the SIE (the Service des impôts des entreprises, the corporate tax office handling your file), and how the money must travel, the yearly routine becomes predictable. The paragraphs below give you that routine with the exact legal texts.
A. What French corporate tax (IS) taxes and when your company must file the return
Almost every company a foreign founder creates in France falls inside IS by construction. Article 206 of the Code général des impôts provides that “sont passibles de l’impôt sur les sociétés, quel que soit leur objet, les sociétés anonymes, les sociétés en commandite par actions, les sociétés à responsabilité limitée n’ayant pas opté pour le régime fiscal des sociétés de personnes”, together with cooperatives and, under conditions, public establishments and any legal person carrying on profit-making operations. In plain English: your SAS (société par actions simplifiée, the flexible joint-stock company most foreign founders choose), your SARL (société à responsabilité limitée, the closed limited-liability company), and your SASU (the one-person SAS) pay IS as a matter of principle, whatever their business. Partnerships and some small SARLs can opt for the pass-through regime of partnerships, but that option is the exception and it must be expressly chosen at formation; if you did not choose it, you are inside IS.
France taxes the profit your company earns in France, not its worldwide profit. Article 209 of the Code général des impôts taxes profits determined under articles 34 to 45 and 53 A to 57 “en tenant compte uniquement des bénéfices réalisés dans les entreprises exploitées en France”, plus the listed categories of French-source income and profits attributed to France by a double-tax treaty. For a foreign founder, this territorial rule has two practical faces. If your French company operates only in France, everything it earns is taxable in France. If it also operates abroad through a branch or sells across borders, only the French-enterprise profit plus treaty-attributed items belong to the French IS base, and the treaty with your home country decides the borderline. Keep the French accounts strictly separated from the foreign activity from day one, because the first question an auditor asks a foreign-owned company is where the profit was really made, and the company that mixes French and foreign flows in one account spends the whole audit proving the obvious.
The accounting base itself is familiar but strict. Article 38 of the Code général des impôts, made applicable to IS by article 209, defines the taxable profit as the net profit from all operations of every kind, and the Lyon administrative court of appeal restated the combined rule in a 2026 IS decision in terms every founder should memorise: Under the combined provisions of articles 38 and 209 of the Code général des impôts, taxable IS profit is the profit from operations of every kind carried out by the business, except operations that, by their purpose or their terms, fall outside normal commercial management. That sentence, taken from CAA Lyon, 2nd chamber, 2 July 2026, No. 25LY03073, SAS Gourbière TP, is the gateway to the whole law of non-deductible management faults developed in the second half of this guide: the tax base is everything the business does, minus what a normal business would never do. Your bookkeeping must therefore show a normal business. Article L123-12 of the Code de commerce states that “Toute personne physique ou morale ayant la qualité de commerçant doit procéder à l’enregistrement comptable des mouvements affectant le patrimoine de son entreprise”, with chronological recording, a yearly inventory, and annual accounts (balance sheet, profit-and-loss account, notes) forming an inseparable whole. Auditors love foreign-owned companies with thin files; a complete French ledger, kept in France by your accountant (expert-comptable) and reconcilable line by line with the bank statements, is your cheapest tax insurance.
Deductible charges are where foreign founders lose the most money through neglect. Article 39 of the Code général des impôts allows deduction of all charges including general expenses, personnel costs and rent, but adds the famous brake on managers’ pay: “les rémunérations ne sont admises en déduction des résultats que dans la mesure où elles correspondent à un travail effectif et ne sont pas excessives eu égard à l’importance du service rendu.” If you pay yourself as président (chairman of the SAS) or gérant (manager of the SARL) while living abroad, document the actual work: board minutes, missions, contracts signed, trips to France, time sheets. The administration systematically tests cross-border pay for effectiveness and excess, and the file that proves real management from abroad keeps the deduction while the file with a monthly transfer and no paper loses it. The same discipline applies to rent paid to yourself, service fees billed by your foreign holding, and loans between your companies: every cross-border flow needs a contract, an invoice, a market price, and a payment trace.
The rate itself is the simplest part of the system. Article 219 of the Code général des impôts states that “Le taux normal de l’impôt est fixé à 25 %.” That 25 percent applies to the rounded taxable profit of standard operations; long-term capital gains on qualifying holdings and specific items follow separate rates set out in the same article, but a young operating company owned from abroad almost always lives under the normal rate. Reduced SME treatment and surcharges for very large turnovers exist at the margins, yet the working assumption for your forecast is 25 percent of the French taxable profit, before foreign tax credits under the applicable treaty. Do not confuse this corporate rate with the 30 percent flat tax (prélèvement forfaitaire unique) on dividends paid to you personally, which belongs to your personal taxation, not to the company’s IS.
Losses are not lost. When your first French year ends in the red, which is common for a newly implanted company paying a Paris lease, a first salary and setup fees, the deficit becomes a charge carried forward against later profits. Article 209 of the Code général des impôts carries the deficit forward within an annual cap of 1,000,000 euros plus 50 percent of the taxable profit above that amount, with the excess pushed to later years. Alongside that forward carry, an older relief survives for profitable companies hit by one bad year: CAA Douai, 4th chamber, 2021, No. 19DA01289, SMAG recalls the carry-back option of article 220 quinquies, under which “Par dérogation aux dispositions du troisième alinéa du I de l’article 209, le déficit constaté au titre d’un exercice ouvert à compter du 1er janvier 1984 par une entreprise soumise à l’impôt sur les sociétés peut, sur option, être considéré comme une charge déductible du bénéfice de l’exercice précédent, dans la limite de la fraction non distribuée de ce bénéfice”, creating a non-taxable state credit refundable after five years or usable against later IS. From abroad, the operational lesson is to file the loss year as carefully as a profitable year: the deficit is an asset recorded on the tax return, and the company that files late or files roughly forfeits the exact carry-forward amount it will need when profits arrive.
Filing is where distance kills. Article 223 of the Code général des impôts requires companies liable to IS to file the profit-or-loss return “dans les trois mois de la clôture de l’exercice. Si l’exercice est clos le 31 décembre ou si aucun exercice n’est clos au cours d’une année, la déclaration est à déposer au plus tard le deuxième jour ouvré suivant le 1er mai.” In practice, a company closing on 31 December files by early May, with the balance sheet, profit-and-loss account, annexes, minutes and allocation statements attached. The return travels electronically through your accountant to the SIE, and the supporting bundle (minutes of the shareholders’ meeting, management report where required, auditor’s report where one exists) must be consistent with what you file at the greffe for the annual accounts. Foreign founders should impose one internal rule: the accountant receives the complete documents by the end of February, the draft return is validated by you in March, and the filing leaves a full month of margin. Every late-filing story we see starts with a missing foreign invoice or an unsigned minute discovered on 30 April.
B. How to pay IS from abroad: quarterly instalments, balance and late interest
IS is not paid once a year after the return; it is prepaid in four instalments computed on last year’s result. Article 1668 of the Code général des impôts provides that IS gives rise to quarterly instalments (acomptes) determined from the last closed year, and that “Les paiements doivent être effectués au plus tard les 15 mars, 15 juin, 15 septembre et 15 décembre de chaque année.” Newly created companies, or companies newly liable to IS, are spared instalments for their first year of activity, and very small turnovers under the stated threshold are also spared; everyone else pays four times a year by reference to the tax on the ordinary-rate result, the reduced-rate result and the article 238 result of the last year. The balance (solde) is then paid when the return is filed, once the true profit of the year is known. From abroad, this means your French bank account must be funded before each of the four dates, with a SEPA transfer ordered several days ahead and a mandate authorising the direct debit where you use one. Foreign banks sometimes block first-time debits to the French Treasury as suspicious; test the payment channel with the first instalment and keep the proof of each transfer, because in a dispute the Treasury’s ledger decides and your bank advice is your only reply.
Missing an instalment or the balance is expensive by design. Article 1727 of the Code général des impôts states that “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.” Late interest accrues month by month on top of the principal, and the code adds penalties where the delay reveals deliberate failure (article 1729, 40 percent for deliberate breach (manquement délibéré), 80 percent for abuse of rights or fraud), plus the surcharge for late filing of the return itself. The SAS Gourbière TP case cited above shows the full stack in one sentence: the reassessed company received the IS principal, the VAT reminder, with late interest and the 40 percent surcharge for deliberate breach under article 1729(a) of the Code général des impôts. From abroad, treat any Treasury letter about a missed instalment as an emergency: pay or regularise within days, keep the receipt, and have the accountant reconcile the Treasury account online. Interest stops only when the principal is paid, and every month of postal delay between your home country and the SIE is billed to you.
A final payment trap specific to foreign founders is the dividend stage. Once IS is paid, distributing the after-tax profit to yourself abroad triggers withholding tax (retenue à la source) under article 119 bis of the same code, reduced or eliminated by the applicable double-tax treaty, plus your home-country taxation with a foreign tax credit. Founders who empty the company by current-account withdrawals (compte courant d’associé, the shareholder’s running account recording advances and withdrawals) instead of voted dividends discover at audit that the withdrawals are reclassified as disguised distributions with interest, penalties and personal taxation. Vote the distribution in a proper shareholders’ meeting, record it in minutes, file the dividend return, pay the withholding through the company, and only then transfer the net amount abroad with the treaty form attached. The company that separates IS (the company’s tax), withholding (the tax on the cross-border payment), and personal tax (your tax at home) never confuses the three drawers; the company that mixes them pays all three at once with penalties.
II. When the tax office reassesses your French company: defend the result and contest from abroad
A reassessment (redressement) is not a fine dropped from the sky; it is a procedure with mandatory steps, fixed reply periods, and several exits. Foreign-owned companies are reassessed on the same grounds as French ones, but distance magnifies three risks: management faults between related companies, unjustified liabilities sitting in the balance sheet, and files too thin to prove anything. The paragraphs below map those three triggers to the 2026 case law, then give you the defence path from the first letter to the administrative court, all workable without living in France.
A. What triggers an IS reassessment: management fault, unjustified liabilities and missing proof
The most frequent IS adjustment against groups with a foreign founder is the abnormal management act (acte anormal de gestion): a decision no normal business would take, whose cost the administration adds back to the taxable profit. The Lyon court restated the test in the Gourbière TP judgment in words to quote exactly: Debt waivers granted by a company to a third party are as a rule outside normal commercial management, unless it appears that by granting the advantage the company acted in its own interest. The same judgment adds the burden-of-proof rule that decides most cases: once the administration shows an advantage without apparent consideration, the administration is deemed to have proved abnormal management as soon as the company cannot show what consideration it received in return. In that case, the company had invoiced building works to another company sharing common shareholders, left 418,496.58 euros unpaid out of 909,246.24 euros billed in 2009 and 2010, then issued credit notes including 75,000 euros excluding tax on 28 April 2017; the court upheld the add-back of the 75,000 euros to the 2017 result with the 40 percent deliberate-breach surcharge, rejecting the informal-group-interest argument because the two companies had only that single commercial relationship. For a foreign founder, the translation is direct: loans, waivers, free services or under-priced sales between your French company and your foreign holding, your sister company, or a company owned by your family are presumed abnormal unless you prove the French company’s own interest with contemporaneous evidence. An interest in the foreign group, common shareholders, or the wish to save a partner’s business does not count; a French commercial return does. Before any intra-group waiver, secure a written analysis showing what the French company gains (preserved outlet, avoided loss, reciprocal commitment), price the transaction at market level with a comparable, and minute the decision as directors of the French company, not as owners of the group.
The second classic trigger is the unjustified liability: a debt sitting in the balance sheet whose reality the company cannot demonstrate, which the administration taxes as a profit in the first non-prescribed year under the opening-balance intangibility rule (article 38, 4 bis). The Marseille court gave a complete 2026 illustration in CAA Marseille, 3rd chamber, 2 July 2026, No. 24MA03123, SCI Burazur. A property company carried a 7-million-euro loan allegedly granted in 2004 by a Swiss company under a notarised deed, with no disbursement trace, no repayment and no cash movement, interest booked yearly, and the term pushed to 2023 at 1 percent during the proceedings; the administration, after a verification of accounts, treated the unexplained liability as taxable and disallowed the related interest. The court first validated the procedure, holding that “La proposition de rectification du 15 décembre 2016 adressée à la SCI Burazur mentionne les impositions, les exercices concernés, les textes applicables et le montant des rehaussements envisagés”, so that the company had been put in a position to reply usefully even though the notice did not spell out the intangibility mechanism of article 38, 4 bis. It then confirmed the substance: a notarised deed that was never challenged by forgery proceedings and admission of a claim in an old collective proceeding do not prove that the funds were actually made available, successive changes of accountant do not excuse the absence of disbursement proof, and interest on an unproven loan is not deductible. Foreign founders should read this case as a checklist for every shareholder loan, foreign-parent advance or historic liability in the French balance sheet: keep the bank transfer advice showing the money entering the French account, the signed loan agreement with rate, term and repayment schedule, the yearly statements, and the actual repayments with their traces. A liability without a money trail is a future reassessment; a liability with a complete trail is a normal financing line that auditors close in minutes.
The third trigger is simpler and more common than the first two: missing proof of charges, stock, or revenue completeness during a verification of accounts (vérification de comptabilité). The auditor arrives with a notice, examines the computerized accounts on site or from the office, compares bank movements with declared turnover, tests margins against the sector, and asks for the documents behind the largest charges. Foreign-owned companies fail this test when the decision-maker lives abroad and the proof lives elsewhere: supplier contracts in the founder’s home language without translation, payroll evidence with the foreign payroll provider, cash movements explained orally months later, or an inbox where the auditor’s interim letters wait unread. The administration then reconstructs turnover from bank credits, disallows undocumented charges, and notifies the add-backs with the late interest and surcharges described above. Prevention from abroad is unglamorous and decisive: give your French accountant a complete monthly file (sales invoices, purchase invoices, bank statements, loan documents, payroll summaries from the DSN, the déclaration sociale nominative that reports French wages each month), answer every auditor request in writing within the stated time, and never let the auditor discover a document at the meeting that you could have sent the week before. Audits reward the company that looks administered; they punish the company that looks remote.
B. How to contest the reassessment from abroad: reply, claim and go to the administrative court
Every IS reassessment follows the adversarial (contradictoire) procedure, and each step gives you a lever that works by post and by representative. It starts with the rectification proposal (proposition de rectification). Article L57 of the Livre des procédures fiscales provides that “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.” That proposal must state the tax, the years, the legal basis, the factual reasons and the amounts, as the Marseille judgment confirms, and article L48 of the same book requires the administration to indicate the amount of duties, taxes and penalties resulting from the envisaged adjustments before you reply. You then have 30 days to answer (article L11), extendable by 30 more days on request made before expiry, which the same article L57 grants expressly: request the extension systematically from abroad, because translation, document gathering across two countries, and coordination between accountant and lawyer always take longer than the printed deadline. Your reply should accept what is correct (spontaneous acceptance reduces penalties and interest), rebut point by point what is wrong with numbered exhibits, and propose the alternative treatment with its texts. In the Gourbière TP file, the company challenged the motivation of the proposal under articles L57 and R57-1 and invoked the unfavourable opinion of the direct-tax commission; the court rejected those procedural pleas on the facts, which shows that motivation challenges win only when the notice truly lacks taxes, years, amounts or reasons, not when you simply disagree with them. From abroad, the winning reply is therefore substantive: prove the French company’s own interest for each disputed advantage, produce the missing money trail for each disputed liability, and attach the translation of every foreign-language exhibit by a sworn translator where needed.
If the administration maintains the adjustment, it sends its reply to your observations, then the assessment notice (avis de mise en recouvrement), which opens the formal claim stage (réclamation). File the claim to the SIE within the statutory period printed on the notice, restating the facts, the law and the exhibits, and asking for discharge or reduction with suspension of payment where available (sursis de paiement with guarantees). Attach everything: the rectification proposal, your dated reply with its proof of sending, the administration’s answer, the assessment, the bank proofs, the contracts, the minutes, and the accountant’s reconciliation. A claim that merely repeats “we disagree” without exhibits dies; a claim that shows the auditor factually or legally wrong on each head, with a complete bundle a stranger can follow, often obtains a partial discharge at this administrative stage, because the SIE reviewer was not the auditor and reads the file cold. Where the claim is rejected expressly or by silence after six months, you have two months to bring the case to the tribunal administratif (administrative court) of the place of taxation, which for a Paris company is the Paris court, with appeal to the cour administrative d’appel and, on points of law, to the Conseil d’État. The three 2026 judgments cited in this guide all reached the courts of appeal years after the adjustments (2017 facts judged in 2026 in Lyon, 2013-2014 facts judged in 2026 in Marseille), which tells you the honest timeline: contesting is a multi-year commitment, and the file you build in the first 30 days determines the outcome in year three. Litigation itself needs no travel: your French lawyer files, pleads in writing, and appears alone, while you supply testimony-quality evidence from abroad and approve strategy by video call.
Deadlines and money discipline during the dispute decide as much as the legal arguments. Interest under article 1727 runs until payment, so consider paying the disputed principal under reservation and litigating for restitution where the cash allows it; the claim for repayment then carries its own interest if you win. Never miss the claim and court deadlines printed on each notice: French tax judges dismiss late filings without examining the merits, however strong the case on management fault or liability proof. Keep a single dispute calendar shared by you, the accountant and the lawyer, with the 30-day reply period, the assessment date, the claim deadline, the six-month silence period, and the two-month court deadline each entered with an alert one week ahead. For Paris and Île-de-France companies, state the competent SIE and the competent tribunal administratif correctly on every letter, keep a Paris address where mail is actually opened weekly (domiciliation contract or lawyer’s office with a forwarding mandate), and prepare the standard local bundle in advance: Kbis less than three months old, RBE receipt (the beneficial-owners register filing), lease or domiciliation contract, representative mandate, last three IS returns with payment proofs, and the full correspondence with the auditor. The two borders drawn by the 2026 case law should stay on your wall: Lyon punishes advantages without French consideration, Marseille punishes liabilities without money trails. The company that documents consideration and trails from day one litigates from strength; the company that reconstructs them after the proposal arrives litigates uphill.
Conclusion
French corporate tax for a company owned from abroad rewards the founder who treats it as a yearly production line: clean monthly accounts, a filed return by the article 223 deadline, four instalments funded before 15 March, 15 June, 15 September and 15 December, a voted and declared dividend circuit instead of informal withdrawals, and a complete money trail behind every cross-border flow. The 25 percent rate of article 219 is only the visible part; the real tax cost is decided in article 39 deductions, article 209 territoriality, deficit carry-forward discipline, and above all the twin evidentiary rules of 2026, being that waivers without French consideration are added back and liabilities without disbursement proof are taxed. When the proposal of rectification arrives, answer within the extended period with numbered exhibits, claim with a complete bundle, and take the case to the administrative court within its two-month window if the administration holds its ground. Run from Paris or from another continent, the method is the same: prove the French company’s own interest in every advantage it grants, prove the money behind every debt it carries, and never let a deadline pass in silence. Do that, and IS becomes what it should be for a serious foreign investor, a predictable 25 percent on real French profit rather than a chain of surprises ending in surcharges.