You moved to France after Brexit, kept your UK shares with a British broker and left some savings in a UK bank account, and assumed the tax story ended in Britain. Then the first French tax notice arrives, the avis d’impôt, and it taxes your Tesco dividends and your UK savings interest as if they were French income. Many British residents discover at that moment that France taxes worldwide income, that the British dividend allowance counts for nothing in Montreuil or Lyon, and that a tax bill can quietly double when both countries claim the same pounds. This guide explains, for a British reader living in France, which country is entitled to tax your UK dividends and your UK bank interest, how the France-United Kingdom double tax treaty of 2008 divides the charge between London and Paris, how you declare the income on the French returns, when the French flat rate beats the progressive scale, and how you challenge a bill that ignores the treaty. French legal terms are explained the first time they appear, every decisive rule is tied to its official source, and the challenge routes described are the ones the French tax courts actually apply.
I. Which Country Taxes Your UK Dividends and Interest When You Live in France
Two questions decide everything before any figure is entered on a return. First, are you a French tax resident, so that France can tax your worldwide savings at all. Second, what does the France-United Kingdom treaty allow each country to take, because the treaty can cap, and sometimes remove, one side’s share. Readers who are still unsure about their residence position should start with the tie-breaker analysis that decides dual-residence cases between France and the United Kingdom, set out in the guide to the Franco-British tax residence tie-breaker, then return here for the savings-income mechanics.
A. How French Residence Pulls Your Worldwide Savings Into French Tax
Article 4 A of the French General Tax Code, the code général des impôts, states the worldwide principle in one sentence: “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.” In plain terms, once France regards you as fiscally domiciled here, your UK dividends and your UK bank interest fall inside French income tax exactly as French-source income does. Full text: Article 4 A of the code général des impôts.
Fiscal domicile, the domicile fiscal, is defined by Article 4 B: “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”. A British retiree whose family home and daily life are in Dordogne, a transferee working in Paris, or a remote worker whose main presence is in France each meets at least one of these tests, and meeting one test is enough. Full text: Article 4 B of the code général des impôts.
Once residence is settled, Article 120 of the same code sweeps foreign investment income into the French base. It provides: “Sont considérés comme revenus au sens du présent article : 1° Les dividendes, intérêts, arrérages et tous autres produits des actions de toute nature et des parts de fondateur des sociétés, compagnies ou entreprises financières, industrielles, commerciales, civiles et généralement quelconques dont le siège social est situé à l’étranger quelle que soit l’époque de leur création”. Dividends from a London-listed company and interest on a UK savings account are therefore French taxable income by statute, not by administrative practice. Full text: Article 120 of the code général des impôts. Article 158 then confirms the symmetry of the system: French net income rules apply “sans qu’il y ait lieu de distinguer suivant que ces revenus ont leur source en France ou hors de France”, with no distinction between French-source and foreign-source income. Full text: Article 158 of the code général des impôts.
Three misunderstandings cause most of the shock bills seen in practice. First, the British dividend allowance, currently £500 a year under official British guidance (British government guidance on tax on dividends), is purely a British computation rule. It reduces the British bill; it does not reduce the French base by a single pound, because France computes its tax on the gross dividend under its own code. Second, the fact that a British broker paid the dividend gross, with no British tax deducted, does not mean the income is untaxed anywhere. It means the United Kingdom took nothing, leaving France to tax the full amount, which is exactly what Articles 4 A and 120 require. Third, British tax-residence concepts such as the statutory residence test do not decide the French question. France applies Article 4 B first, and only if both countries claim you does the treaty’s tie-breaker intervene. Declaring the income in Britain, or paying British tax on it, never by itself removes the French charge; at most it opens the treaty credit examined below.
The practical consequence is straightforward and worth stating bluntly. If your home, your main stay, or your principal professional activity is in France, your UK dividends and UK savings interest must appear on your French return for their gross amounts, converted into euros, even when the money never leaves Britain. Omitted foreign income is routinely detected through the automatic exchange of information now operating between Britain and France, then reassessed with increases on top under Article 1758 A. Savings income is no exception.
B. What the France-United Kingdom Treaty Lets Each Country Tax
The treaty that divides these claims is the France-United Kingdom double tax convention signed in 2008 and in force, whose official British text is published at the 2008 United Kingdom and France Double Taxation Convention. Its numbering differs from older treaties: dividends are dealt with in Article 11, interest in Article 12, and the elimination of double taxation in Article 24. Each rule below is quoted from that official text.
For dividends, the treaty gives the residence country, France in our case, the primary right, but it expressly preserves a limited British taxing right. Article 11 provides that dividends arising in one State and paid to a resident of the other may be taxed in that other State, and adds that they may also be taxed in the State where they arise, subject to a ceiling of 15 per cent of the gross dividend where the recipient is its beneficial owner. The 15 per cent figure is a ceiling, not a fixed charge: British domestic law decides whether Britain actually levies anything, and on dividends paid to individual shareholders Britain in practice deducts nothing at source, so the shareholder receives the dividend gross. The ceiling matters when British tax is genuinely levied, and it caps what France must later relieve. A qualifying British dividend allowance or a zero British bill does not create a French credit out of thin air; France relieves tax actually paid in Britain, within the treaty limit, as Article 24 confirms.
For interest, the treaty is cleaner and more generous to the French resident. Article 12, paragraph 1 reserves interest to a single taxing State: interest arising in one State and beneficially owned by a resident of the other is taxable only in that other State. Interest on a UK bank or savings account beneficially owned by a French resident is therefore taxable only in France. If a British bank has deducted British withholding on that interest, the deduction should not have happened under the treaty, and the remedy sits on the British side: a treaty claim to HM Revenue and Customs for repayment, using the residence certification France provides. France, for its part, taxes the gross interest in full. Confusing the two remedies is a classic and expensive error: asking France for a credit for British withholding that the treaty says should never have been levied invites refusal, while the correct British repayment claim goes unfiled and time runs out.
The French-side relief for genuine British tax is organised by Article 24. France takes into account income that Britain may tax under the treaty, the British tax is not deducted from the income itself, but the French resident receives a tax credit against French tax, measured by reference to the treaty article covering the income, with the decisive cap that the credit can never exceed the French tax attributable to that same income. Three consequences follow. The credit is computed income by income, so British tax on dividends cannot shelter French tax on interest or on salary. The credit can never exceed the French tax on that same income, so when the British levy is heavier than the French charge on those pounds, the surplus is lost rather than refunded or carried forward. And the credit requires proof of British tax actually paid in accordance with the treaty, which means keeping the British assessments, deduction certificates, and payment evidence alongside the French return. A British dividend taxed in Britain within the 15 per cent ceiling thus produces a French bill reduced by the British tax paid, capped at the French tax on that dividend; a British dividend that bore no British tax produces a French bill with no credit at all.
One final treaty boundary deserves emphasis because British clients often assume the opposite. The treaty divides taxing rights; it does not harmonise allowances, rates, or wrappers. The British £500 dividend allowance, British personal savings allowances, and British individual savings account rules have no equivalent effect in France. France taxes the gross receipt under Articles 120 and 158, applies its own flat rate or scale, and grants only the Article 24 credit. The treaty spares you from paying twice on the same pounds, but it never promises you the lighter of the two systems.
II. How You Declare, Pay and Challenge the French Bill on UK Savings Income
The mechanics reward method and punish approximation. Gross amounts must be declared, the choice between the French flat rate and the progressive scale must be made deliberately, the British account itself must be reported on a separate form, and every challenge runs through a formal claim procedure with hard time limits. Each step below follows the official publications of the French tax administration, the direction générale des finances publiques, and the statute.
A. How You Declare UK Dividends and Interest and Choose Between the Flat Rate and the Progressive Scale
French-resident individuals declare foreign investment income on the foreign-income return, form 2047, and carry the totals onto the main income return, form 2042. The return must show gross income before any British deduction, because France computes its tax on the gross and then applies the treaty credit separately. Exchange conversion uses the euro value at receipt, and the figures must reconcile with the British vouchers and statements: a dividend of £2,000 with £500 of British tax shown on the voucher is declared as £2,000 of gross income with £500 of creditable British tax, never as £1,500 of net income. Declaring the net amount understates the French base and forfeits the visible credit, producing the worst of both worlds.
The default French taxation of this income is the single flat-rate levy, the prélèvement forfaitaire unique, universally called the PFU. Article 200 A of the General Tax Code establishes the mechanism: “L’impôt sur le revenu dû par les personnes physiques fiscalement domiciliées en France au sens de l’article 4 B à raison des revenus, gains nets, profits, distributions, plus-values et créances énumérés aux 1° et 2° du A du présent 1 est établi par application du taux forfaitaire prévu au B du présent 1”. Full text: Article 200 A of the code général des impôts. The rate itself is confirmed by the tax administration at 12.8 per cent for capital income taxed under the flat-rate mechanism (French tax administration page on investment income). Capital income, the revenus de capitaux mobiliers, therefore bears 12.8 per cent income tax at the flat rate, and social charges come on top.
The social charges, the prélèvements sociaux, are frequently the larger surprise. Article L. 136-6 of the Social Security Code provides: “Les personnes physiques fiscalement domiciliées en France au sens de l’article 4 B du code général des impôts sont assujetties à une contribution sur les revenus du patrimoine assise sur le montant net retenu pour l’établissement de l’impôt sur le revenu”, and the list expressly includes “c) Des revenus de capitaux mobiliers”. Full text: Article L. 136-6 of the code de la sécurité sociale. The administration confirms the current rates on the same official page: Social charges were collected at 17.2 per cent on investment products paid in 2025, rising to 18.6 per cent from 1 January 2026 for most products, with only certain insurance and regulated-savings products staying at 17.2 per cent, not ordinary dividends or bank interest. A British resident of France therefore faces, on UK dividends and UK bank interest, roughly 30 per cent in combined French levies under the flat rate: 12.8 per cent income tax plus 17.2 or 18.6 per cent social charges depending on the year of receipt.
British readers affiliated to the British health system sometimes object that they should escape French social charges altogether, citing the famous de Ruyter line of cases. Since Brexit that objection fails for British affiliates, and a French appeal court has stated the reason with unusual clarity. The Paris administrative appeal court recalled “qu’une personne relevant d’un régime de sécurité sociale d’un État membre de l’Union européenne autre que la France, d’un État membre de l’Espace économique européen ou de la Suisse ne peut être soumise aux prélèvements sur les revenus du capital prévus par la législation française qui entrent dans le champ du règlement du 29 avril 2004”, before adding the decisive counterpart: “ce règlement ne fait pas obstacle à ce qu’une personne affiliée à la sécurité sociale dans un État tiers à l’Union européenne autre que la Suisse ou les États membres de l’Espace économique européen soit soumise à ces mêmes prélèvements” (CAA Paris, 24 December 2020, no. 19PA02765, CAA Paris 24 December 2020 no. 19PA02765). The United Kingdom is now precisely such a third State. A British national covered only by the British system therefore remains liable to French social charges on UK dividends and interest, while a British resident who is simultaneously insured in an EU Member State, the wider European Economic Area, or Switzerland may still invoke the single-legislation principle. The distinction turns on actual affiliation, proven by the British certificate of coverage or the European health insurance position, not on nationality or on the location of the bank.
The alternative to the flat rate is taxation under the progressive scale, the barème progressif, elected by ticking box 2OP on the return. The election is made by ticking box 2OP on the return. It is global, covering all of the household’s capital income and securities gains together, and it has lost its former irrevocable character from 2026. The election favours taxpayers whose marginal income-tax rate is low and, crucially, holders of qualifying dividends, because Article 158 grants relief of “40 % de leur montant brut perçu” on dividends covered by its second paragraph. A retiree couple in France with modest pension income and £4,000 of UK dividends may pay less under the scale with the 40 per cent relief than under the 12.8 per cent flat rate, while a higher-rate household with substantial salary will usually lose by electing. Social charges apply in both cases, though their base follows the elected income-tax treatment. The comparison must be run on the household’s real figures every year; electing by habit, in either direction, is how overpayments happen.
Two advance mechanisms soften collection. Where the payer is established in France, Article 125 A imposes a prepayment collected at source: “Les personnes physiques fiscalement domiciliées en France au sens de l’article 4 B qui bénéficient d’intérêts, arrérages et produits de toute nature de fonds d’Etat, obligations, titres participatifs, bons et autres titres de créances, dépôts, cautionnements et comptes courants, ainsi que d’intérêts versés au titre des sommes mises à la disposition de la société dont elles sont associées ou actionnaires et portées sur un compte bloqué individuel, sont assujetties à un prélèvement lorsque la personne qui assure le paiement de ces revenus est établie en France”. Full text: Article 125 A of the code général des impôts. For income paid from Britain, no French prepayment is collected, and households below the statutory household-income ceilings can separately request exemption from the advance levy by giving their bank a sworn statement before 30 November of the year preceding receipt; the administration explains that the levy is later credited against the final tax and refunded if it exceeds the tax due. Interest and dividends that bore no French prepayment are simply settled on the assessment, the avis d’impôt, with the treaty credit applied. Under-declaring or omitting the income triggers Article 1758 A: “Le retard ou le défaut de souscription des déclarations qui doivent être déposées en vue de l’établissement de l’impôt sur le revenu ainsi que les inexactitudes ou les omissions relevées dans ces déclarations, qui ont pour effet de minorer l’impôt dû par le contribuable ou de majorer une créance à son profit, donnent lieu au versement d’une majoration égale à 10 % des droits mis à la charge du contribuable ou de la créance indue.” Full text: Article 1758 A of the code général des impôts. The 10 per cent increase applies before any consideration of bad faith, and late filing after a formal demand raises it further.
B. How You Report the UK Account, Reclaim Excess Foreign Tax and Challenge a Wrong Assessment
The account itself must be reported, separately from the income. Every French-resident holder of a bank or investment account outside France must file form 3916 each year, listing each account opened, used, or closed abroad. The official service-public guidance confirms the duty covers French-domiciled private individuals holding accounts with banks or other financial providers outside France (service-public guidance on declaring accounts held abroad). A UK current account receiving the dividends, a UK savings account producing the interest, and a British brokerage account holding the shares each count. The sanctions are fixed and heavy: €1,500 per undeclared account, rising to €10,000 where the account sits in a State that has no tax-information treaty with France, plus an 80 per cent increase applied to the duties on the undeclared sums. Britain has a full treaty relationship with France, so the ordinary €1,500 fine per account normally applies, but three unreported accounts mean three fines, and the 80 per cent increase attaches to the duties on the undeclared sums. Filing form 3916 late but spontaneously is treated far more leniently in practice than waiting for the administration to discover the account through automatic exchange of information, which between Britain and France now operates routinely.
Where British tax was genuinely and treaty-compliantly levied, France relieves it through the Article 24 credit described above: declare the gross, compute the French tax, and impute the British tax paid up to the French tax on that income. Where British tax was levied in breach of the treaty, particularly withholding on interest that Article 12 reserves to France alone, the claim goes to Britain, not to France. The taxpayer asks HM Revenue and Customs for repayment under the treaty, supported by the French certificate of residence, and declares the gross interest in France without manufacturing a French credit for a foreign levy that should be refunded at source. Keep both files consistent: the British repayment claim and the French return must show the same gross figures, or each administration will suspect the other file.
When the French assessment itself is wrong, the challenge follows a strict procedural order that the Conseil d’État polices closely. The leading principle comes from the Conseil d’État, 31 May 2022, no. 461519: “Une convention bilatérale conclue en vue d’éviter les doubles impositions ne peut pas, par elle-même, directement servir de base légale à une décision relative à l’imposition et, par suite, il incombe au juge de l’impôt, lorsqu’il est saisi d’une contestation relative à une telle convention, de se placer d’abord au regard de la loi fiscale nationale pour rechercher si, à ce titre, l’imposition contestée a été valablement établie avant de déterminer si cette convention fait ou non obstacle à l’application de la loi fiscale.” Full decision: Conseil d’État 31 May 2022 no. 461519. In practice this means the claim must first show that domestic law was misapplied, for example a 2OP election ignored, a 40 per cent relief omitted, social charges levied on an EU-insured person, or a credit forgotten, and then show that the treaty blocks the resulting charge. A claim that waves the treaty without identifying the domestic error fails at the first step.
The vehicle for that claim is the formal administrative claim, the réclamation, filed with the tax administration before any court action. The tax administration confirms that a taxpayer who spots an error or disputes the calculation and the amount shown on the tax notice may file a claim (French tax administration guidance on contesting a tax). Filing the claim does not suspend the obligation to pay, although a stay of payment, the sursis de paiement, can be requested alongside it. A denied treaty credit, a forgotten 2OP election visible on the return, and wrongly applied social charges each qualify as errors in the base or the computation of the assessment. Time is short and jurisdictional: claims on assessed taxes must reach the administration “au plus tard le 31 décembre de la deuxième année suivant celle” of collection or of the contested payment, under Article R*196-1 of the same book (full text: Article R*196-1 of the livre des procédures fiscales). A 2024 assessment contested on treaty grounds must therefore be claimed by 31 December 2026, and a late claim dies whatever its merits. For Paris and Île-de-France residents, the claim goes to the local tax office, the service des impôts des particuliers, of the arrondissement or suburb of residence, filed online through the secure messaging of the personal account wherever possible so the date is stamped; refusal or six months of silence opens the administrative court, the tribunal administratif de Paris for Paris residents, with appeal to the Paris administrative appeal court. The file should contain the British vouchers and assessments, proof of British payment, the euro conversions, the French returns with the 2047 detail, the 3916 filings, the affiliation evidence for any social-charges argument, and a computation showing the capped credit income by income. Courts compute; assertions without schedules lose.
Conclusion
A British resident of France pays French tax on British dividends and British savings interest because Articles 4 A, 4 B, 120, and 158 of the French code say so, at the 12.8 per cent flat rate or under the progressive scale with its 40 per cent dividend relief, plus French social charges that Brexit has made unavoidable for those covered only by the British system. The 2008 treaty prevents double taxation but never grants the lighter system: Britain may tax dividends up to 15 per cent and must spare interest that belongs to France alone, while France credits genuine British tax income by income up to its own tax on that income. Declare gross amounts on forms 2047 and 2042, report every British account on form 3916, elect the 2OP scale only after running the household figures, reclaim treaty-breaching British withholding in Britain, and challenge French errors first through the formal claim within its second-year deadline, showing the domestic mistake before invoking the treaty. Kept in that order, with vouchers, conversions, and filings to prove each step, British savings income in France costs exactly what the law requires, and not a pound more.