You lived in France for years — working in Lyon, retired in the Dordogne, the children schooled in Toulouse — and then you moved back to Britain. The old family house is still yours, and now you want to sell it. This is the most deadline-driven sale a British owner can face in France, because the tax code gives departing residents two short exemption windows and then shuts them: sell the former main home quickly and quietly enough and France takes nothing; miss the date, lend the house to your son for a summer, or fall on the wrong side of a nationality condition rewritten by Brexit, and the full machinery starts — 19% income tax, 17.2% social levies, a possible surtax, an accredited representative (représentant fiscal, a professional established in France who answers to the French tax administration for payment of your bill), and a treaty tail that lets France tax you for six years after you left. This guide works through the leaver’s sale in plain English, with the exact French statutes, the France–United Kingdom treaty in its official English text, and three court decisions you can check yourself: which windows are still open to a British seller, what you pay when none applies, how the sale completes from abroad, how Britain credits the French tax, and how to challenge a refusal or an overstated bill on paper that wins.

The short answer is that timing and papers decide everything. If you sell no later than 31 December of the year after you moved your tax home (domicile fiscal, the place the tax code treats as your fiscal home) out of France, and the house has not been made available to anyone else in between, a specific exemption can wipe the bill out — but itsSmall print now excludes most British sellers, and a second, older shelter capped at 150,000 euros is reserved in terms to European Union and European Economic Area nationals. Outside those windows you pay like any non-resident individual: 19% on the gain after holding-period relief (abattement pour durée de détention, a percentage knocked off the gain for each year of ownership), plus 17.2% in social levies (prélèvements sociaux, contributions funding French social protection) on their own slower-melting base, plus a 2% to 6% surtax above 50,000 euros of taxable gain. The French notaire (a French public officer who draws up the deed of sale, computes the tax, files the return and pays the Treasury before releasing your balance) runs the completion, and the United Kingdom taxes the same gain under its own rules while crediting the French tax. Every French term below is explained the first time it appears.

I. Can You Still Escape French Tax After Leaving France?

A. Which Exemption Windows Survive Your Departure, and Which Did Brexit Close?

Start with the rule that taxes you, because every exemption is an exception to it. Article 150 U of the French General Tax Code (Code général des impôts) provides that “les plus-values réalisées par les personnes physiques ou les sociétés ou groupements qui relèvent des articles 8 à 8 ter , lors de la cession à titre onéreux de biens immobiliers bâtis ou non bâtis ou de droits relatifs à ces biens, sont passibles de l’impôt sur le revenu dans les conditions prévues aux articles 150 V à 150 VH” A sale for payment (cession à titre onéreux, as opposed to a gift or inheritance) of built or unbuilt property triggers French income tax on the gain (plus-value). Because you no longer live in France, the levy is collected through the non-resident mechanism of Article 244 bis A: “Sous réserve des conventions internationales, les plus-values, telles que définies aux e bis et e ter du I de l’article 164 B , réalisées par les personnes et organismes mentionnés au 2 du I lors de la cession des biens ou droits mentionnés au 3 sont soumises à un prélèvement selon les taux fixés au III bis.” And the treaty confirms France’s first right in English: Gains from selling immovable property situated in one of the two States may be taxed in that State Your old French home is taxed in France even though you now live in Leeds — and the treaty adds a tail worth reading now: the treaty preserves the right of a State to tax gains of a person who is, or was at any time during the previous six fiscal years, one of its residents — or is resident there in the fiscal year of the sale For six fiscal years after you were French-resident, France keeps a treaty-protected right to tax your gains. This tail rarely changes the outcome on a French house — France taxes it anyway as the situs State — but it matters the moment you argue that only Britain should tax: within six years of leaving, that argument fails on the treaty’s own terms.

The first window is the fast one, and it is measured in months. Article 244 bis A lifts the levy entirely for “la cession de l’immeuble qui constituait la résidence principale en France du cédant à la date du transfert de son domicile fiscal hors de France dans un Etat membre de l’Union européenne ou dans un Etat ou territoire ayant conclu avec la France une convention d’assistance administrative en vue de lutter contre la fraude et l’évasion fiscales ainsi qu’une convention d’assistance mutuelle en matière de recouvrement ayant une portée similaire à celle prévue par la directive 2010/24/ UE du Conseil du 16 mars 2010 concernant l’assistance mutuelle en matière de recouvrement des créances relatives aux taxes, impôts, droits et autres mesures et qui n’est pas un Etat ou territoire non coopératif au sens de l’article 238-0 A.” The exemption covers the building that was your main home (résidence principale, where you habitually and effectively lived) in France on the day you moved your tax home out — and then comes the double lock: “Cette exonération s’applique à la double condition que la cession soit réalisée au plus tard le 31 décembre de l’année suivant celle du transfert par le cédant de son domicile fiscal hors de France et que l’immeuble n’ait pas été mis à la disposition de tiers, à titre gratuit ou onéreux, entre ce transfert et la cession.” Sell by 31 December of the year after the move, and put the house at nobody’s disposal — not a tenant, not your daughter, not a paying guest — between the move and the sale. Leave France in March 2025 and you must complete by 31 December 2026 with the house empty or still yours alone throughout. Two honest cautions follow. First, the destination condition lists European Union Member States and then States with matching administrative-assistance and recovery-assistance treaties: whether the United Kingdom’s treaty network satisfies that second limb after Brexit is a file-by-file question for your notaire and, if needed, a written ruling — do not assume it, and do not let anyone tell you the answer without pointing at the text. Second, the “no disposal to third parties” condition is policed through electricity contracts, insurance, tax-habitation records and neighbour statements: a house lent free to family between departure and sale fails it just as surely as a rented one.

The second window is wider but carries the clearest Brexit nationality bar in the code. Article 150 U exempts “la cession d’un logement situé en France lorsque le cédant est une personne physique, non résidente de France, ressortissante d’un Etat membre de l’Union européenne ou d’un autre Etat partie à l’accord sur l’Espace économique européen ayant conclu avec la France une convention d’assistance administrative en vue de lutter contre la fraude et l’évasion fiscales et à la condition qu’il ait été fiscalement domicilié en France de manière continue pendant au moins deux ans à un moment quelconque antérieurement à la cession.” A non-resident individual who lived in France continuously for at least two years at some point can sell one French dwelling exempt — but only as a European Union or European Economic Area national, “dans la limite d’une résidence par contribuable et de 150 000 € de plus-value nette imposable,” one home per taxpayer and 150,000 euros of net taxable gain at most, for sales “Au plus tard le 31 décembre de la dixième année suivant celle du transfert par le cédant de son domicile fiscal hors de France” or with no deadline at all “lorsque le cédant a la libre disposition du bien au moins depuis le 1er janvier de l’année précédant celle de la cession” Since Brexit a British passport no longer meets the nationality condition, so this ten-year, 150,000-euro shelter is closed to you even if you lived in the house for twenty years before moving to Kent. Treat any pre-2021 guide promising it to Britons as expired. And if you sell within months of leaving, a third, judge-made tolerance may still help: the main-home exemption covers property “Qui constituent la résidence principale du cédant au jour de la cession” and in its judgment of 2 July 2024, no. 22VE02161, the Versailles Administrative Court of Appeal confirmed that “un immeuble ne perd pas sa qualité de résidence principale du cédant au jour de la cession du seul fait que celui-ci a libéré les lieux avant ce jour, à condition que le délai pendant lequel l’immeuble est demeuré inoccupé puisse être regardé comme normal.” Vacating before completion does not alone destroy main-home status if the empty period is normal — about one year is tolerated in a normal market, and beyond that you must prove genuine marketing with signed mandates, dated adverts, price cuts and viewing logs. The seller in that case left a Paris flat empty seventeen months with an unsigned mandate and two documented viewings, and lost. For a leaver completing within a year of the move with an agent instructed from week one, this case is the shield; for a leaver selling three years on, it is out of reach, and the bill below applies.

B. If No Window Applies, What Will You Actually Pay on the Old House?

Outside the windows you pay as a non-resident individual, and the rate is the same 19% as residents — equality the courts imposed. Article 244 bis A sets the levy: “les personnes physiques, les associés personnes physiques de sociétés, groupements ou organismes dont les bénéfices sont imposés au nom des associés et les porteurs de parts, personnes physiques, de fonds de placement immobilier mentionnés à l’article 239 nonies sont soumis au prélèvement au taux de 19 %.” Individuals pay 19%, and “Le prélèvement mentionné au I est libératoire de l’impôt sur le revenu dû en raison des sommes qui ont supporté celui-ci.” The levy discharges (libératoire) your French income tax on the gain: no further French income-tax return for it. That ceiling was litigated to the top: before 2015, non-residents outside a small circle paid 33⅓% where residents paid 19%, until in its decision of 23 June 2022, no. 445785 the Conseil d’État (the supreme court for administrative and tax disputes) held that “le prélèvement applicable aux plus-values réalisées par les contribuables non-résidents au taux de 33,1/3 % en vertu des dispositions combinées des articles 219 et 244 bis A du code général des impôts était constitutif d’une restriction à la libre circulation des capitaux entre les Etats membres de l’Union européenne et les Etats tiers, prohibée par l’article 63 du traité sur le fonctionnement de l’Union européenne” A 33⅓% non-resident rate was an unlawful restriction on capital movements between Member States and third countries — a provision expressly covering third countries, so it still shelters British sellers — while European law “faisait seulement obstacle à un prélèvement excédant le taux de 19 % applicable, en vertu des dispositions de l’article 200 B du code général des impôts, aux plus-values de même nature réalisées par les résidents de France” Only a levy above the residents’ 19% is barred. The working rule is therefore simple: as an individual, any French income-tax charge above 19% on your sale has already been judged unlawful, and a challenge can cite this decision by name and number.

The gain itself is sale price minus proven cost, then relief melts it year by year. Article 150 VB of the General Tax Code fixes the starting point: “Le prix d’acquisition est le prix effectivement acquitté par le cédant, tel qu’il est stipulé dans l’acte” The acquisition price is what you actually paid, as stated in the deed — returning leavers must therefore dig out the original purchase deed (acte authentique) from years ago, plus invoices for works by qualifying firms, or the 15% flat uplift available after five years of ownership. A house you inherited from a parent while living in France counts under a special rule: “En cas d’acquisition à titre gratuit, le prix d’acquisition s’entend de la valeur retenue pour la détermination des droits de mutation à titre gratuit.” Property received by gift or succession (acquisition à titre gratuit, without payment) counts at the value declared for French gift or succession duty — so the succession declaration filed years ago silently sets your cost base today. Relief then runs through Article 150 VC: “6 % pour chaque année de détention au-delà de la cinquième” and “4 % au titre de la vingt-deuxième année de détention.” extinguishing the 19% after 22 full years. The 17.2% social levies melt more slowly — 1.65% a year from the sixth to the twenty-first year, then 1.6% in the twenty-second and 9% a year to the thirtieth — vanishing after 30 years (official tables on service-public.fr, which also confirms the combined arithmetic: on a 20,000-euro taxable gain, 3,800 euros of tax plus 3,440 euros of levies). Small sales escape: “Dont le prix de cession est inférieur ou égal à 15 000 €” (Article 150 U). Large ones attract the surtax: Article 1609 nonies G charges “à raison des plus-values imposables d’un montant supérieur à 50 000 €” at 2% to 6% of the whole taxable gain with smoothing at each threshold. Take a leaver’s file: you bought in Lyon in 2012 for 210,000 euros, added 25,000 euros of invoiced works, moved to Manchester in 2023, lent the flat to your brother for a year — killing both exemption windows — and sell in 2026 for 340,000 euros after fourteen full years. Gross gain: 105,000 euros. Income-tax relief: nine years at 6%, or 54%, leaving 48,300 euros taxable at 19%, or 9,177 euros. Levies relief: nine years at 1.65%, or 14.85%, leaving 89,415 euros at 17.2%, or 15,379.38 euros. Total: about 24,556 euros — and because the income-tax base of 48,300 euros sits below 50,000, no surtax. Had the base crossed the threshold, 2% to 6% of the whole would have been added: the single most expensive line leavers overlook.

II. Completing the Sale From Abroad, Getting Credit in Britain, and Challenging the Bill

A. How Does Completion Work When You Live in Manchester, and How Does Britain Treat the French Tax?

Brexit returned a procedural cost that European sellers do not pay: the accredited representative. Article 244 bis A requires that “L’impôt dû en application du présent article est acquitté lors de l’enregistrement de l’acte ou, à défaut d’enregistrement, dans le mois suivant la cession, sous la responsabilité d’un représentant établi en France, accrédité par l’administration fiscale.” Payment at registration, under the responsibility of an accredited representative established in France — and “L’obligation de désigner un représentant fiscal ne s’applique pas lorsque le cédant est domicilié, établi ou constitué dans un Etat membre de l’Union européenne ou dans un autre Etat partie à l’accord sur l’Espace économique européen ayant conclu avec la France une convention d’assistance administrative en vue de lutter contre la fraude et l’évasion fiscales ainsi qu’une convention d’assistance mutuelle en matière de recouvrement de l’impôt.” Only European Union and European Economic Area sellers escape. A British seller living in Britain must in principle appoint one — budget a few hundred euros plus the guarantee — unless the file meets a narrow exemption the administration lists in English: sale price of 150,000 euros or less, or a gain fully exempt from both tax and levies (see service-public.fr, non-resident section). Raise the question with the notaire at the preliminary-contract (compromis de vente) stage, in writing: a representative appointed the week before completion can delay the signing and cost you the buyer.

The notaire then runs a locked sequence. Article 150 VH provides that “L’impôt sur le revenu afférent à la plus-value réalisée sur les biens mentionnés aux articles 150 U à 150 UC est versé lors du dépôt de la déclaration prévue à l’article 150 VG” — the tax is paid when the gain return (form 2048-IMM, drawn up in practice by the notaire) is filed — and that “L’impôt sur le revenu afférent à la plus-value est payé avant l’exécution de l’enregistrement ou de la formalité fusionnée.” Payment comes before registration and the merged registration-and-publication formality (formalité fusionnée, the single step registering the deed and publishing the transfer at the land registry); without it, “le dépôt ou la formalité est refusé.” The notaire withholds the tax from the price on completion day and sends you only the balance — which is why you must demand the draft 2048-IMM a fortnight before signing the final deed (acte authentique de vente) and check the acquisition price, works, dates and percentages against the articles above. Britain then taxes the same sale under its own capital-gains rules, but the treaty blocks double taxation: French tax paid under French law in line with the treaty is allowed as a credit against United Kingdom tax computed on the same gains You report the sale on the United Kingdom Self Assessment return — gov.uk directs foreign gains to Self Assessment with Foreign Tax Credit Relief where eligible, detailed in HM Revenue and Customs helpsheet HS263 — compute the British liability in sterling under British rules, and set the French tax against it euro for euro up to the British tax on that gain. Keep the French assessment, the 2048-IMM, the proof of payment and the completion statement: without them the credit stalls. And note the boundary the treaty itself draws: only French tax charged “in accordance with this Convention” is creditable, so an unlawful excess challenged successfully in France must not simply be left sitting in the British computation — challenge it at source first.

B. How Do You Challenge a Refused Exemption or an Overstated Bill?

French tax disputes climb a fixed ladder, and each rung has papers and deadlines. First comes the administrative claim (réclamation contentieuse): a reasoned letter to the office holding the assessment, naming the tax, the year and the exact sum disputed, with the deeds, the 2048-IMM, proof of payment, the old French tax notices proving two years of domicile where relevant, and any social-security affiliation certificates — sent by registered letter with acknowledgement of receipt (lettre recommandée avec accusé de réception), the receipt kept, the date diarised. Silence past the reply period matures into an implied refusal that opens the administrative court (tribunal administratif) of the property’s location, then the administrative court of appeal (cour administrative d’appel), then the Conseil d’État on points of law. Judges decide on exhibits, so every assertion points to a numbered document and the defended computation is set out in a table. Four leaver files recur. First, the refused fast-window exemption: the office says the house was put at a third party’s disposal, but the alleged occupant was a caretaker under a written gardiennage agreement with no tenancy rights — the claim attaches the agreement, utility bills in your name and the insurance, and asks for full discharge (dégrèvement, the formal wiping-out of the charge). Second, the nationality refusal on the 150,000-euro shelter: the office is right on the current text for most British sellers, so the honest move is to verify rather than fight — unless the seller also holds Irish or another European nationality, in which case the claim attaches that passport and the two years of French tax notices and asks for the shelter. Third, the miscounted base: the return ignored 25,000 euros of invoiced works or used the wrong acquisition date — the claim cites Article 150 VB, attaches invoices with bank proofs, recomputes both relief lines and prices the difference to the euro. Fourth, the social-levy dispute for a seller insured in another Member State: on 26 February 2015, in case C-623/13 de Ruyter, the Court of Justice held that levies on investment income which help fund compulsory social-security schemes have a direct and relevant link with the listed branches of social security and fall within the coordination regulation, even when charged irrespective of any professional activity — engaging the single-legislation principle Because the levies finance compulsory schemes, they are social contributions under the single-legislation principle — so a seller affiliated in Ireland or working across a European border attaches the A1 certificate for the sale year and seeks refund of the 17.2% with interest. A seller affiliated only to the British system pleads this case only with advice, the post-Brexit position turning on later legislation and the Trade and Cooperation Agreement’s social-security Protocol. In every file, claim the precise sum, the interest and the costs article, and maintain all grounds: French judges grant what is asked and reasoned, not what is implied.

Conclusion

Leaving France does not end the French tax story of your old home; it starts a countdown. Within the fast window — completion by 31 December of the year after departure, house kept from every third party — exemption is possible but conditioned, and the destination-State condition needs checking file by file for Britain. The wider 150,000-euro shelter is closed to British-only nationals by its own terms. The main-home tolerance covers at most about a year of genuine marketing, proved with mandates and viewings. Beyond that you pay 19% after 6%-a-year relief from the sixth year, 17.2% after slower relief to thirty years, and 2% to 6% above 50,000 euros of taxable gain — through a notaire who withholds before registration, under a representative most British sellers must appoint, with Britain crediting the French tax against its own. The leavers who win are the ones who calendar the 31 December deadline before they move, keep the house empty, keep every deed and invoice, read the draft 2048-IMM before completion, and challenge precisely and on paper when the bill exceeds the statutes, the treaty and the cases set out here.

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Telephone consultation: 80 EUR TTC with an avocat of the firm within 48 hours. Call +33 6 46 60 58 22 or write via the contact page. Bring your deeds, the draft 2048-IMM, the completion statement and any refusal or reassessment letter so the advice starts from your papers, not from generalities.