You live in Britain, you own a house in France, and a letter from the French tax office talks about an impôt sur la fortune immobilière. That name means the French tax on property wealth, universally shortened to IFI. Since 1 January 2018 it has replaced the old solidarity tax on wealth, the impôt de solidarité sur la fortune (ISF), and unlike its predecessor it taxes only property, not savings or investments. Many British second-home owners assume that because they are resident in the United Kingdom for tax purposes, French wealth tax cannot touch them. That assumption is wrong. French law taxes you on your French property assets once their net value passes 1,300,000 euros, whether you live in London, in Paris or nowhere at all, and Brexit has not changed that one bit. What Brexit did change is the paperwork around you: no more European Union (EU) упрощ facilities, no British exemption, and a United Kingdom (UK) tax system that offers no credit for a French wealth tax because Britain simply has no equivalent tax. This article explains who pays, on what, how the bill is worked out, how to file the return from Britain, and how to challenge an assessment you believe is wrong, with the exact legal texts and court decisions that decide these cases.
I. Do I Owe French IFI on My Second Home When I Live in Britain?
A. Who the tax catches after Brexit: non-residents, new residents and couples
The starting point is article 964 of the Code général des impôts (CGI), the French general tax code, which states: “Il est institué un impôt annuel sur les actifs immobiliers désigné sous le nom d’impôt sur la fortune immobilière”. In plain English, France levies an annual tax on property assets called the tax on property wealth. The same article then draws the line that matters most for a British reader. People whose tax home, their domicile fiscal, is in France pay on their property assets wherever those assets sit in the world. People whose tax home is outside France, which includes every British reader who stayed UK-resident after Brexit, pay “des biens et droits immobiliers”, meaning land, buildings and rights over buildings, situated in France, plus the shares of companies or bodies to the extent that their value represents those same French buildings and rights. Your Dordogne farmhouse is caught. Your London flat is not. Your shares in a French société civile immobilière (SCI), the family property-holding company so many British buyers use, are caught in proportion to the French bricks behind them.
Three features of that rule deserve attention because they generate most of the disputes. First, everything is measured on a single photograph taken on 1 January of the tax year. Article 964 closes with the sentence: “Les conditions d’assujettissement sont appréciées au 1er janvier de chaque année”. If you sold the house in February, you still owe the tax for that year. If you bought in March, the first bill comes the following year. Death, divorce or a gift during the year does not rewrite the 1 January picture. Second, the 1,300,000 euro threshold applies to the net value of the taxable assets, after deductible debts, not to the price you paid and not to one house in isolation. A cottage worth 900,000 euros plus a Paris studio worth 500,000 euros puts you above the line even though neither property does so alone. Below the line you owe nothing and you file nothing. Above it, the whole scale applies from 800,000 euros upwards, as section II explains. Third, couples are taxed together whether they like it or not. The article provides: “Sauf dans les cas prévus aux a et b du 4 de l’article 6, les couples mariés font l’objet d’une imposition commune. Les partenaires liés par un pacte civil de solidarité défini à l’article 515-1 du code civil et les personnes vivant en concubinage notoire font l’objet d’une imposition commune.” A married couple, civil partners under a pacte civil de solidarité (PACS, the French registered partnership), and even unmarried partners in a stable, publicly known relationship, a concubinage notoire, are taxed jointly. A British couple who each own half of a French house worth 2,600,000 euros cannot each claim to be below the threshold. Their joint net property is what counts.
New arrivals get one softening rule worth knowing. People who move their tax home to France after at least five years of non-residence are taxed for the first five years only as if they were non-residents, meaning only on French assets, not on property kept in Britain. Article 964 states that individuals “qui n’ont pas été fiscalement domiciliées en France au cours des cinq années civiles précédant celle au cours de laquelle elles ont leur domicile fiscal en France ne sont imposables qu’à raison des actifs mentionnés au 2°”, and that this shelter runs “jusqu’au 31 décembre de la cinquième année qui suit celle au cours de laquelle le domicile fiscal a été établi en France”. A family that relocates from Kent to Lyon keeps its UK buy-to-let outside the French wealth tax base for five full years, while the new French main home enters it immediately. After the five years, worldwide property joins the base. Readers who moved in 2021 should therefore check whether 2026 is the year their British property enters the picture.
Two British-specific misunderstandings need clearing up at this stage. The France-UK double tax convention of 19 June 2008 covers income tax, corporation tax and capital gains. It does not cover IFI, and the UK side confirms the gap: the GOV.UK guide on being taxed twice offers foreign tax credit only against UK tax on the same income, and there is no UK wealth tax against which an IFI bill could be credited. You cannot set French IFI against UK income tax, and HM Revenue and Customs (HMRC) will not refund it. The second misunderstanding concerns the Withdrawal Agreement. A residence permit under that agreement settles your right to live in France. It settles nothing about wealth tax. A protected British resident with a French home above the threshold pays exactly like a newcomer on a visitor visa with the same house. The public explainer that summarises all of this for households is the service-public.fr page on who and what IFI covers, which confirms the 1,300,000 euro entry point, the 1 January rule and the joint taxation of couples.
B. Which assets count and what they are worth: house, SCI shares, loans and family rights
The base of the tax is defined by article 965 CGI: “L’assiette de l’impôt sur la fortune immobilière est constituée par la valeur nette au 1er janvier de l’année”. The base is the net value on 1 January of the year. Net means debts come off, but only certain debts, as shown below. The first basket is straightforward: all the buildings and building rights belonging to the taxpayer and to minor children whose property the taxpayer legally administers. That covers the farmhouse, the flat, the building plot, the parking space, and rights such as a droit d’habitation, a personal right to live in a property. The second basket is the one British families most often overlook: “Des parts ou actions des sociétés et organismes établis en France ou hors de France”, meaning shares in companies or bodies wherever established, but only “la fraction de leur valeur représentative de biens ou droits immobiliers”, meaning only the slice of their value that represents buildings or building rights held directly or indirectly. If your English limited company holds a French villa, or your SCI holds it, the taxable amount is the fraction of the shares matching the French property, after the company’s own property debts. A British family that bought through an SCI for succession reasons, a very common arrangement, does not escape the tax by interposing the company. The SCI is transparent for IFI purposes: the bricks are taxed in the shareholders’ hands.
A company that genuinely trades is treated differently from a company that merely holds the family’s bricks. Article 966 CGI provides: “n’est pas considérée comme une activité industrielle, commerciale, artisanale, agricole ou libérale l’exercice par une société ou un organisme d’une activité de gestion de son propre patrimoine immobilier”. Managing your own property portfolio is not a trade. So a SCI that only lets the family villa is not a trading company, and its property stays in the base. A company running a hotel, a campsite or a genuine furnished-letting business with staff and services may qualify for the business-property relief, but the furnished flat you lend to friends for six weeks a year does not. Readers who let their second home should therefore keep the rental-tax analysis and the IFI analysis strictly separate: a letting can be taxable as rental income while the same walls are also taxable to wealth, and neither exempts the other.
Valuation is where British owners lose or win cases. Article 973 CGI states: “La valeur des actifs mentionnés à l’article 965 est déterminée suivant les règles en vigueur en matière de droits de mutation par décès”. Property is valued under the same rules as for death duties, meaning open-market value, the valeur vénale, on 1 January. The Cour de cassation, France’s supreme court for civil and tax penalty matters, defined that notion in terms every owner should memorise. In Cass. com., 27 March 2019, appeal no. 18-10.933, the court held that market value means the price that supply and demand on a real market would produce for the building, assessed in the factual and legal situation where the building stands on the taxing date. In other words, the test is the price a real market would pay on 1 January for that property in its actual state and legal position. In that case the owners of a Paris mansion, taxed under the old ISF on the same valuation principles still used for IFI, argued for a discount because they held the house in indivision, meaning joint ownership without division into shares that can be freely sold. The court refused any automatic discount: the judges had found it unlikely that either spouse would sell a share of the family home, so the legal form did not dent the price. The lesson for a British reader is practical. A discount for joint ownership, for a sitting tenant, for a planning restriction or for a right of way must be proved with comparables, estate-agent evidence and, ideally, a valuer’s report. It is never granted by status alone.
One relief is famous and frequently misapplied by British owners. Article 973 continues: “un abattement de 30 % est effectué sur la valeur vénale réelle de l’immeuble lorsque celui-ci est occupé à titre de résidence principale par son propriétaire”. A 30 per cent reduction applies to the building occupied as the owner’s main home, the résidence principale. Only one building per jointly taxed household qualifies. A second home, by definition, never qualifies. A British owner living in London with a holiday house in Provence gets no 30 per cent cut. A British owner who has genuinely moved into the French house as the main home does, even with a British passport, because the test is occupation, not nationality. Claiming the relief on a house you visit eight weeks a year is one of the fastest routes to a reassessment with penalties.
Debts reduce the base, but within tight walls. Article 974 CGI provides: “Sont déductibles de la valeur des biens ou droits immobiliers et des parts ou actions taxables les dettes, existantes au 1er janvier de l’année d’imposition, contractées par l’une des personnes mentionnées au 1° de l’article 965 et effectivement supportées par celle-ci, afférentes à des actifs imposables”. Only debts existing on 1 January, taken on by the taxpayer, actually borne by the taxpayer and linked to taxable assets count: purchase loans, genuine repair and improvement costs, and the property share of mixed loans. Consumer credit, loans for the London flat when you are non-resident, and debts owed to yourself through contrived structures do not. The sharpest wall is the anti-avoidance rule in article 973 II, which neutralises loans taken out from the buyer, from the buyer’s family or from a company the buyer controls when the loan funds the purchase of an asset the lender has just sold to the borrowing company. Family SCIs financed by shareholder current accounts, comptes courants d’associés, the familiar technique where parents sell the house to the SCI and leave the price outstanding as a loan, sit exactly on this fault line.
The leading illustration is a 2025 judgment every SCI family should read. In Tribunal judiciaire de Compiègne, 2 September 2025, case no. 24/00911, a couple had created two SCIs, sold Paris properties belonging to the wife into one of them, financed the deal through shareholder current accounts, and later passed the shares to their children by a formal shared gift, a donation-partage recorded by a notary on 1 June 2022. The tax office applied the anti-avoidance rule and refused the debt deduction. The court sided with the family and ordered: “PRONONCE le dégrèvement supplémentaire au titre de l’IFI 2020 à hauteur de 5.965 euros à titre principal et 251 euros d’intérêts de retard, et, au titre de l’IFI 2021 à hauteur de 5.918 € à titre principal et 107 € d’intérêts de retard, soit la somme totale de 12.241 euros”. A dégrèvement is a formal discharge of tax. Why did the family win? Because the court found the arrangement belonged to a wider succession plan, the second gift explained the timetable, health problems and the pandemic explained the delay, and the economics made sense: the judges held that these points “permettent de considérer que le redevable a apporté la démonstration que l’objectif principalement recherché n’était pas principalement fiscal au sens des dispositions citées ci-dessus”, meaning the taxpayer had shown the mainly pursued aim was not mainly fiscal. A British family with a French SCI should draw the operational lesson. Keep the notary’s file showing the succession purpose, complete the gifts to the children rather than leaving the structure half built, and be ready to show that fees and constraints outweighed the tax saving. An undocumented current account with no gift at the end looks like tax planning. The same account inside a completed, notarised transmission plan can survive.
Two final building blocks complete the base. Split ownership between a life tenant and a bare owner follows article 968 CGI: “Les actifs mentionnés à l’article 965 grevés d’un usufruit, d’un droit d’habitation ou d’un droit d’usage accordé à titre personnel sont compris dans le patrimoine de l’usufruitier ou du titulaire du droit pour leur valeur en pleine propriété”. Property burdened with a usufruit, the right to use and take income from someone else’s property, or a personal right of occupation or use, is normally taxed in the hands of the life tenant or right-holder for its full unencumbered value. Gifts of the bare ownership, the nue-propriété, to children while the parents keep the life interest therefore do not move the IFI bill to the children, except in the specific statutory cases, such as a surviving spouse’s legal life interest, where the value is split using the age scale in article 669. Life assurance needs one sentence too. Under article 972 CGI, the surrender value of redeemable policies and capitalisation bonds expressed in property-linked units counts to the extent of those units. A British assurance-vie, the French savings wrapper often sold to expatriates, holding a property fund therefore feeds the IFI base through its property units, while the euro fund does not.
II. How Do I Declare IFI and Challenge the Bill?
A. What rate applies, which form to file and how to pay from Britain
The rate scale is set by article 977 CGI: nothing up to 800,000 euros, 0.50 per cent between 800,000 and 1,300,000 euros, 0.70 per cent between 1,300,000 and 2,570,000 euros, 1 per cent up to 5,000,000 euros, 1.25 per cent up to 10,000,000 euros, and 1.50 per cent above. Because the entry threshold is 1,300,000 euros, a taxpayer just above the line pays the 0.50 and 0.70 per cent slices on the lower bands, not 0.70 per cent on everything. To soften the cliff edge, the same article grants a smoothing reduction, the décote, for net taxable property between 1,300,000 and 1,400,000 euros: the tax computed on the scale is reduced by 17,500 euros minus 1.25 per cent of the net taxable value. Worked in round numbers, net property of 3,000,000 euros produces roughly 2,500 euros on the first slice, 8,890 euros on the second and 4,300 euros on the third, about 15,690 euros before any gift relief. That figure surprises British owners who compare it with council tax. It is a wealth tax, not a service charge, and it stacks on top of the taxe foncière, the French council-type property tax, which you go on paying separately.
One relief can cut the bill for generous taxpayers. Article 978 CGI lets you set 75 per cent of certain cash gifts and gifts of listed shares against IFI, up to 50,000 euros of tax reduction, where the gifts go to research and higher-education bodies, recognised public-utility foundations, insertion enterprises and similar named recipients. A 10,000 euro gift to an eligible foundation cuts the IFI bill by 7,500 euros. Keep the receipt, the reçu fiscal, because the tax office asks for it in every audit. Gifts to a British charity that has no French branch, or to family members, do not qualify.
Filing follows the income-tax return. Article 982 CGI states: “Les redevables mentionnent la valeur brute et la valeur nette taxable des actifs mentionnés à l’article 965 sur la déclaration annuelle prévue à l’article 170”. Taxpayers enter the gross and net taxable values on the annual return provided for by article 170, with schedules describing and valuing each asset. In practice that means the dedicated schedules of form 2042-IFI, filed with the yearly income return in May or June, online from Britain through your personal account on the French tax website. The official 2042-IFI form page on impots.gouv.fr gives the current millésime and its annexes. Non-residents file to the non-resident tax office, the Direction des impôts des non-résidents, and pay by bank transfer to the stated revenue office. Late or missing filing draws the standard penalties: interest for late payment plus surcharges, and a higher surcharge where the administration shows the failure was deliberate. Because the tax office already receives the notary’s deed prices and the land-registry data, an undeclared villa above the threshold is discovered quickly. Voluntary correction before any audit letter almost always costs less than waiting.
One Brexit paperwork point catches British owners every spring. Article 983 CGI warns: “Les personnes possédant des actifs mentionnés à l’article 965 situés en France sans y avoir leur domicile fiscal ainsi que les personnes mentionnées au 2 de l’article 4 B peuvent être invitées par le service des impôts à désigner un représentant en France dans les conditions prévues à l’article 164 D”. Owners of taxable French assets without a French tax home may be required to appoint a representative, a représentant fiscal, in France. The exemption that follows covers only people domiciled in an EU Member State or in the European Economic Area (EEA) under assistance agreements. The United Kingdom is now in neither group, so a British-resident owner above the threshold can receive that invitation and should answer it rather than ignore it. In practice the representative, often a lawyer or an approved agent, receives the correspondence, files and pays on your behalf, and is jointly liable, which is why agents charge for the role. If your French house sits below the threshold and you owe no IFI, the invitation should not come; if it does, a short letter with the valuation evidence closes the matter.
Practical valuation discipline from Britain decides most files. Value each property at its 1 January market price using at least three genuine comparables: recent notarial sales of similar houses in the same commune, adjusted openly for size, condition and aspect, never estate-agent asking prices presented as sales. Deduct only provable debts: the capital outstanding on the purchase mortgage at 1 January, documented improvement works that are genuinely improvement rather than routine maintenance, and the property share of any mixed loan. Keep the mortgage statement dated around 1 January, the loan offer, the invoices and the bank proofs in one folder per year. Photograph structural defects with dates. Where an SCI holds the house, keep the company’s balance sheet reconciling the share value with the bricks. Where the 30 per cent main-home reduction is claimed because France really is now your main home, keep the school certificates, the French health registration, the utility bills and the evidence that the British address is no longer the centre of the household. The file you build in May is the file you will defend with two years later.
B. How to challenge the assessment: deadlines, arguments and the court that decides
Challenge starts with a formal complaint to the tax office, the réclamation contentieuse, and the clock is statutory, not negotiable. Article R*196-1 of the Livre des procédures fiscales, the book of tax procedure, 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”, followed by the three starting points, including “De la mise en recouvrement du rôle ou de la notification d’un avis de mise en recouvrement”, meaning the collection of the tax roll or the notification of a recovery notice. In ordinary language, you have until 31 December of the second year after the year of the collection notice. An IFI bill notified in autumn 2026 can be challenged until 31 December 2028. Miss that date and the substance no longer matters. File online through your tax account or by recorded-delivery letter, state the tax, the year and the amount disputed, ask expressly for discharge, the décharge, or reduction, the réduction, of the assessment, and attach the evidence. Always pay first or ask for a stay with guarantees where the sum is large; recovery runs while you argue, and bailiff costs are never recovered even if you win.
The winning arguments fall into four families, and the order matters. First, below-threshold arithmetic: the net value at 1 January, after genuine debts, did not reach 1,300,000 euros, because the tax office overvalued the house or refused a deductible loan. This is the most common British case, and it is won with comparables and mortgage statements, not with rhetoric. The 2019 Cour de cassation market-price test set out in section I is your shield and your discipline at once: the court measures a genuine market price, so bring real sales, and accept that a beautifully renovated stone farmhouse near a sought-after village may genuinely be worth more than you feel. Second, the wrong person or the wrong household: the house belongs to the children, the divorce has transferred it, the PACS has ended, or the deceased’s estate, the succession, had already passed it on before 1 January. Land-registry extracts and notarial deeds prove this, not letters. Third, the wrong legal treatment: the 30 per cent main-home reduction refused although France is the genuine main home, the usufruct wrongly allocated, the SCI fraction miscalculated, or the anti-avoidance rule applied to a loan that is genuinely commercial or succession-driven. The Compiègne judgment shows the template for the last point: prove the non-fiscal purpose with dated documents, the notarised shared gift, the health records explaining delay, the fee invoices showing the operation cost more than it saved, and ask the court to find, as it did there, that the aim “n’était pas principalement fiscal”. Fourth, procedure and penalties: the reassessment is time-barred, the recovery notice was never served at your last known address, or the deliberate-failure surcharge is asserted without proof of intent. Penalties need their own paragraphs and their own evidence. A valuation victory wipes out the surcharge base automatically, but where the value stands, the surcharge must be fought separately.
The court that hears you is not the one most British readers expect. Income-tax disputes go to the administrative court, the tribunal administratif. IFI, like death duties and registration charges, goes to the ordinary civil court, the tribunal judiciaire, of the place of the tax office that assessed you, with appeal to the cour d’appel and then the Cour de cassation on points of law. The Compiègne case went exactly that way: a family against the regional finance directorate before the judicial court, ending in a discharge of 12,241 euros plus 800 euros under article 700 of the Code of civil procedure for irrecoverable costs, the frais irrépétibles, the standard costs order that partly refunds what you paid your lawyer. For a Paris or Île-de-France property held from London, the competent court is normally the tribunal judiciaire of the collecting office’s area, and Paris files are heavy, so expect twelve to twenty-four months to judgment. Before going to court, use the free administrative remedies seriously: the-style reply to the reassessment proposal, the hierarchical appeal to the superior officer, and the departmental conciliator. A well-documented valuation file with three comparables and a valuer’s note settles a surprising number of cases at this stage, because the local valuer knows the commune better than the national audit grid.
Three Paris and Île-de-France specifics close this section. First, Paris prices move fast, and the tax office’s automated estimates often lag or overshoot by arrondissement and street. A Rive Gauche apartment and a Seine-Saint-Denis pavilion are not valued with the same curve, and 1 January values in a rising year differ materially from summer sale prices. Date your comparables to the previous autumn and say so. Second, non-resident owners frequently discover the IFI bill together with the income-tax bill for a furnished letting in the same house. Fight each on its own ground: the letting return decides the rental profit, the IFI schedules decide the wealth value, and a concession on one is not a concession on the other. Third, keep every year’s file for at least six years after filing. Reassessments can look back three years as a rule, up to ten where undeclared foreign structures are involved, and the interest meter runs from the original due date. The cheapest dispute is the one your folder wins before it starts.
Conclusion
IFI follows the British owner to France whether Brexit moved the person or not. Above 1,300,000 euros of net French property at 1 January, the non-resident pays on the French bricks and the SCI slice behind them, the new resident shelters British property for five years, and couples are taxed jointly in every configuration from marriage to publicly known cohabitation. Value is proved like a sale, with real comparables under the Cour de cassation’s market-price test, not with feelings or asking prices. Debts count only where they exist at 1 January, burden you and attach to taxable assets, and family current accounts survive the anti-avoidance rule only inside a documented succession plan of the kind the Compiègne court discharged in September 2025. The return goes on the 2042-IFI schedules, the representative can be required of a British resident, and there is no UK credit to soften the bill. The challenge runs on a hard clock to 31 December of the second year, then to the judicial court. Measure on 1 January, file cleanly in May, and keep the folder that proves both.
Need a quick opinion on your case
If you have received an IFI assessment, a valuation reassessment or a penalty notice for your French property, or you need to know before buying or gifting whether the threshold catches you, our firm offers a telephone consultation within 48 hours with a lawyer of the firm. Call +33 6 46 60 58 22 or write via our contact page. The firm advises British residents and second-home owners throughout France, and clients in Paris and Île-de-France.