You settled in France after Brexit, you kept your house in Kent, your British pension still lands in a UK bank account every month, and now two tax offices want a share of the same income. HM Revenue and Customs treats you as a British taxpayer, the French fisc (the tax administration) sends you an avis d’impôt (tax assessment notice) on your worldwide income, and each side points at the other. This double claim is exactly what the France–United Kingdom double tax treaty signed in London in 2008 was written to resolve. In force since 18 December 2009 and effective in France from 1 January 2010 (2008 UK-France Double Taxation Convention), it decides which country taxes what, and it gives you a mechanism — the tax credit — so the same pound is not taxed twice. This guide explains, in plain English and with the exact legal texts, how France decides you are its tax resident, what France can still tax when you are not, how the treaty splits pensions, rents and dividends between the two countries, and how to challenge a French assessment that ignores the treaty, step by step and within the deadlines.
I. Will France Treat You as a French Tax Resident — and What Can It Tax?
A. I Live Between Britain and France — Am I a French Tax Resident?
French domestic law starts with a blunt rule. Article 4 A of the Code général des impôts (the French general tax code) provides: “Les personnes qui ont en France leur domicile fiscal sont passibles de l’impôt sur le revenu en raison de l’ensemble de leurs revenus. Celles dont le domicile fiscal est situé hors de France sont passibles de cet impôt en raison de leurs seuls revenus de source française.” (Article 4 A of the General Tax Code) In other words, a French tax resident pays French income tax on worldwide income, while a non-resident pays only on French-source income. Everything therefore turns on the domicile fiscal (tax domicile), defined by Article 4 B of the same code: “1. Sont considérées comme ayant leur domicile fiscal en France au sens de l’article 4 A : a. Les personnes qui ont en France leur foyer ou le lieu de leur séjour principal ; b. Celles qui exercent en France une activité professionnelle, salariée ou non, à moins qu’elles ne justifient que cette activité y est exercée à titre accessoire” (Article 4 B of the General Tax Code) — followed by a third test, “c. Celles qui ont en France le centre de leurs intérêts économiques.” (Article 4 B of the General Tax Code) One single test is enough: if your foyer (family home) is in France, you are a French tax resident even if you work in London, and even if you spend fewer than 183 days a year in France. There is no day-count in the statute itself; days spent in each country are only evidence.
The foyer is where judges look first, and the Conseil d’Etat (the supreme court for tax disputes) has defined it precisely. In its decision of 9 June 2021, No. 431551, it held: “Pour l’application de ces dispositions, le foyer s’entend du lieu où le contribuable habite normalement et a le centre de ses intérêts familiaux, sans qu’il soit tenu compte des séjours effectués temporairement ailleurs en raison des nécessités de la profession ou de circonstances exceptionnelles, et le lieu du séjour principal du contribuable ne peut déterminer son domicile fiscal que dans l’hypothèse où celui-ci ne dispose pas de foyer.” (Conseil d’Etat, 9 June 2021, No. 431551) The home where you normally live, with the centre of your family interests — that is the foyer, and business travel elsewhere does not move it. In that case the taxpayer claimed Swiss residence, but the court upheld the French assessment because he paid the taxe d’habitation (the former residence tax) in France for the flat where his wife lived, had put his French address on his identity card when renewing it in 2011, had no family ties in Switzerland, and the court even cross-checked his everyday spending and the water consumption of his wife’s flat. Water meters, card addresses, everyday shopping: that is the level of detail at which residence is litigated.
A year later the Conseil d’Etat confirmed the method. On 21 June 2022, in decision No. 449408, it repeated the same definition — “le foyer s’entend du lieu où le contribuable habite normalement et a le centre de ses intérêts familiaux” (Conseil d’Etat, 21 June 2022, No. 449408) — and upheld a finding that a taxpayer who claimed Bulgarian residence was in fact French-domiciled: he kept a Paris flat where his wife and their son, born in France in 2009, lived, plus an occasionally occupied house in Seine-et-Marne, several French bank accounts, works of art, and he had declared his income in France for the years at issue, while producing nothing to show what his daily life in Bulgaria actually looked like. The lesson for British readers is direct. If your spouse and children live in the Dordogne house, if your post, your doctor, your bank and your declared returns are French, the fact that you kept a London pied-à-terre or that your employer sits in the City will not make you a non-resident. Conversely, a British retiree whose whole family life remains in Surrey, who rents a small studio in Paris for a three-month assignment and keeps every centre of interest in Britain, will normally fail all three Article 4 B tests — but will still need to prove it with documents, because the administration starts from appearances: French address on file, French utility bills, French bank account.
Two practical warnings follow. First, the United Kingdom applies its own Statutory Residence Test, which is completely different from Article 4 B, so you can perfectly well be resident in both countries in the same year — dual residence is common in the first years after a move, and the treaty exists precisely for that situation, as Part II explains. Second, Article 4 B itself contains the treaty override: “Les personnes qui satisfont à l’un au moins des critères fixés aux a à c du présent 1 ne peuvent toutefois pas être considérées comme ayant leur domicile fiscal en France lorsque, par application des conventions internationales relatives aux doubles impositions, elles ne sont pas regardées comme résidentes de France.” (Article 4 B of the General Tax Code) Even if French domestic law catches you, the treaty tie-breaker can take you back out — which is why the order of analysis is always domestic law first, treaty second.
B. I Am Not a French Tax Resident — Can France Still Send Me a Bill?
Yes. A non-resident is taxable on French-source income, and Article 164 B of the Code général des impôts lists what counts: “Sont considérés comme revenus de source française” (Article 164 B of the General Tax Code), starting with “Les revenus d’immeubles sis en France” (Article 164 B of the General Tax Code) — income from buildings situated in France — and continuing through French securities and other capital invested in France, businesses situated in France, and professional activity carried on in France. The classic British case is the second home rented out on a furnished or unfurnished basis: the rent of a house in the Luberon is French-source income by paragraph (a), taxable in France even if the landlord lives full-time in Manchester and the rent is paid into a British account. French-source dividends and interest under paragraph (b), profits of a French business under (c), and salary for work physically done in France under (d) complete the picture.
Capital gains follow the same logic. The code expressly treats as French-source capital gains where they relate to “des biens immobiliers situés en France” (Article 164 B of the General Tax Code) — buildings situated in France — and Article 244 bis A then subjects the gains of non-resident sellers of such property to a French levy, expressly subject to the tax treaties. So a British owner who sells a holiday home in Normandy while resident in Leeds faces a French charge on the gain, computed under French rules, with the treaty deciding whether France may tax and how Britain relieves the resulting double hit. The treaty never exempts you from declaring: France taxes first on its source income, and your country of residence then grants relief — the mechanism described in Part II.
One more British-specific trap deserves a flag here. Dividends from a French company paid to a British resident, interest from a French account, and directors’ fees from a French company are all within France’s domestic claim, subject to the treaty caps. Many British recipients discover this when the French payer applies a withholding (prélèvement or retenue à la source) at the full domestic rate instead of the treaty rate — a frequent, fixable error that is challenged through the treaty-rate refund procedure and, if refused, through the formal complaint described in Part II, Section B. Keep every withholding certificate (attestation de retenue), because without it neither the French refund nor the British foreign-tax credit can be proved.
II. How the France–UK Treaty Protects You — and How to Challenge a Bill
A. I Pay Tax in Both Countries — Which Treaty Rule Decides?
The treaty that answers is the Convention signed at London in 2008 between France and the United Kingdom, explained article by article in the French tax administration’s official commentary. On the British side, the official position is that the Double Taxation Convention entered into force on 18 December 2009 and took effect in France from 1 January 2010, with the 2008 convention since modified by the Multilateral Instrument for withholding taxes from 1 January 2019. Always work from the consolidated text as modified — the version published on the impots.gouv.fr treaty pages — and from the French tax administration’s official commentary, the BOFiP entry BOI-INT-CVB-GBR, which explains each article’s scope.
The heart of the treaty is Article 4, residence and the tie-breaker. Paragraph 1 first excludes paper-only claims: a person liable to tax in a State only on income and capital gains from sources inside that State does not count as a treaty resident of that State (Article 4, paragraph 1 of the 2008 Convention). Someone taxable in France only on French-source income — a pure non-resident landlord in Manchester — is not a French treaty resident at all. Then paragraph 2 settles dual residence in a strict cascade that the two States must apply in order: the permanent home comes first, and a person with a permanent home in both States is treated as resident only where personal and economic ties are closest, the centre of vital interests; if that centre cannot be fixed, or there is no permanent home in either State, habitual stay decides; and only if habitual stay also ties does nationality settle the matter (Article 4, paragraph 2 of the 2008 Convention). Permanent home first, centre of vital interests second, habitual stay third, nationality last. In practice the fight is almost always at step one and two: which house is truly permanent, and with which country are personal and economic ties closest. The Conseil d’Etat cases in Part I show exactly what evidence wins — family location, daily spending, consumption records, declared returns — and the same bundle serves for the treaty test. Note the treaty’s foyer d’habitation permanent (permanent home) is close to but not identical with the domestic foyer; run both analyses and keep the evidence for both.
Once residence is settled, each category of income has its own article. Rents and property income fall under Article 6, which gives the State where the property sits the right to tax income from it, including farm and forestry income (Article 6, paragraph 1 of the 2008 Convention). Your Dordogne rents are taxable in France, full stop — Britain then relieves, not the other way round. Paragraph 1 covers direct use, letting and farming alike, and paragraph 5 extends the rule to income from shares or rights that give enjoyment of French-situated property, which matters for certain sociétés civiles immobilières (SCI, the French family property companies) holding French houses for British families. Dividends fall under Article 10, which makes dividends paid by a company of one State to a resident of the other taxable in that other State (Article 10, paragraph 1 of the 2008 Convention) — with further paragraphs capping source-state tax and, for a company holding at least 10% of the payer, removing it. Interest and royalties follow the same residence-state logic in their own articles. The practical reflex: identify the treaty article before arguing — a refund claim that cites the wrong article is refused on that ground alone.
Pensions deserve their own paragraph because they are the number one British worry in France. The treaty rule for private pensions is Article 18, which gives the State of residence the sole right to tax pensions and similar payments made for past employment, subject only to the government-service exception (Article 18 of the 2008 Convention). A British retiree resident in France receiving a former employer’s occupational pension or the UK State Pension is taxable only in France — which means declaring the pension on the French return and claiming exemption or credit in Britain, not the reverse. The exception is public-service pensions. Article 19, paragraph 2 provides that pensions paid by a State or its local authorities for work performed for them are taxable only in the paying State, except where the pensioner lives in the other State and holds solely that other State’s nationality, in which case only that other State may tax (Article 19, paragraph 2 of the 2008 Convention). A British civil-service, local-authority, police, teacher or NHS pension paid out of the British public purse therefore stays taxable in the United Kingdom — unless the recipient is both French-resident and French-national without British nationality, the narrow exception at the end. Misclassifying a public pension as a private one (or the reverse) is the single most common pension error in Franco-British files; check the payer and the scheme before filing.
When both countries may tax — French rents of a French resident taxed first in France, British dividends of a French resident with capped British withholding — double taxation is eliminated by credit, not by exemption. For France, double taxation is removed as follows: income that the treaty leaves taxable in the United Kingdom is still declared for the computation of French tax, and the French resident then receives a tax credit against the French bill, within the sub-limits that depend on the income category (the elimination article of the 2008 Convention). In plain terms: declare the British income in France, compute French tax on it, then set the British tax against the French bill up to the French amount. The mirror rule gives a British resident credit in the United Kingdom for French tax on French-source income. Two frequent failures follow: forgetting to declare the foreign income at all (which turns a credit problem into a penalty problem), and claiming a credit without the foreign assessment and proof of payment. Finally, the treaty’s non-discrimination article protects individuals against taxation or connected obligations that are heavier than those imposed on nationals of the other State in the same situation, residence in particular (the non-discrimination article of the 2008 Convention). A surcharge or procedure applied only to British nationals in the same residence situation is challengeable on this ground in addition to domestic equality arguments.
B. I Have Just Received a French Assessment on My British Income — How Do I Challenge It?
Do not start with the court — start with the paper. Read the avis d’impôt line by line: which income is taxed, in which category (traitements et salaires, pensions, revenus fonciers for property, revenus de capitaux mobiliers for dividends and interest), whether the treaty credit appears, and whether a withholding was applied at the domestic rate instead of the treaty rate. Then match each line to its treaty article — Article 6 for the Bergerac rents, Article 10 for the TotalEnergies dividends, Article 18 or 19 for each pension — and compute what the assessment should have been. Most winnable files are won here: wrong category, missing credit, treaty article ignored, or a pension classified under the wrong article. Assemble the proof bundle at once: the British P60 or pension statements, withholding certificates, the lease and rental accounts for French property, travel records and utility bills if residence is disputed, and the foreign assessment plus proof of payment for any credit claim. A challenge without the foreign proof of payment fails on evidence, however good the law.
The first legal step is compulsory and written. Article R*190-1 of the Livre des procédures fiscales (the French tax procedure code) provides: “Le contribuable qui désire contester tout ou partie d’un impôt qui le concerne doit d’abord adresser une réclamation au service territorial, selon le cas, de la direction générale des finances publiques ou de la direction générale des douanes et droits indirects dont dépend le lieu de l’imposition.” (Article R*190-1 of the Tax Procedure Code) You must first write to the tax office for the place of assessment — a direct court application without this prior complaint is inadmissible. File through your personal account on impots.gouv.fr (messagerie sécurisée) or by recorded-delivery letter, in French, citing the exact domestic article and the exact treaty article and paragraph, showing the correct computation, and attaching the bundle. Ask expressly for discharge (dégrèvement) of the wrongly assessed amount and, where relevant, for the treaty-rate refund of excess withholding.
The deadline is strict and runs fast. Article R*196-1 of the same code provides: “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” (Article R*196-1 of the Tax Procedure Code) of the collection notice, the payment, or the event giving rise to the claim. For income tax assessed by notice, that is 31 December of the second year after the year the assessment was put in collection — miss it and even a perfect treaty argument is time-barred. If the administration rejects the complaint, in whole or in part, or stays silent for six months (an implied rejection), the second step is the tribunal administratif (administrative court) for the place of assessment, within the short appeal period stated in the rejection letter — read that letter immediately and diary the date. Before the court, residence disputes are fought with the Conseil d’Etat toolkit from Part I — family home, daily-life evidence, declared returns — and treaty disputes with the article-by-article analysis from Section A above. Where the two countries’ administrations each insist you are their resident and neither yields, the treaty’s mutual-agreement machinery between the competent authorities is the last-resort route; raise it early through the complaint rather than discovering it after the court deadline has passed.
Three final reflexes protect British files specifically. First, never ignore a French assessment because you “already paid in Britain” — non-payment triggers surcharges and enforced recovery (recouvrement forcé) while the treaty credit or the complaint is pending; pay, challenge, and be repaid, rather than refusing to pay. Second, keep a single chronological file — assessments, returns, British documents, complaints with proof of sending, replies — because treaty files are won on paper trails spanning two administrations. Third, watch the calendar every autumn: the French assessment arrives, the British self-assessment follows in January, and the treaty credit claimed in one must match the tax paid in the other for the same income and the same year. Mismatched years are the quietest cause of refused credits.
Conclusion
France taxes its residents on worldwide income and non-residents on French-source income; the treaty then corrects the overlaps through residence tie-breakers, source rules for property, residence rules for pensions and dividends, and a credit mechanism that leaves each pound taxed once. The British taxpayer who identifies the right treaty article, declares in both countries, keeps the foreign proof of payment, complains first to the tax office before 31 December of the second year, and goes to the administrative court only after, holds every card the system offers. The order never changes: domestic law first, treaty second, evidence throughout — and the file that respects that order is the file that wins.
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Legal sources: CGI, art. 4 A; CGI, art. 4 B; CGI, art. 164 B; CGI, art. 244 bis A; 2008 UK-France Double Taxation Convention; CE, 9 June 2021, No. 431551; CE, 21 June 2022, No. 449408; LPF, art. R*190-1; LPF, art. R*196-1; GOV.UK – France: tax treaties; BOFiP BOI-INT-CVB-GBR-10-30.