{"id":2100497,"date":"2026-08-20T08:06:05","date_gmt":"2026-08-20T06:06:05","guid":{"rendered":"https:\/\/kohenavocats.fr\/2026\/08\/20\/french-wealth-tax-ifi-british-residents-after-brexit-declaration-debts-appeal\/"},"modified":"2026-08-20T08:06:05","modified_gmt":"2026-08-20T06:06:05","slug":"french-wealth-tax-ifi-british-residents-after-brexit-declaration-debts-appeal","status":"publish","type":"post","link":"https:\/\/kohenavocats.fr\/en\/2026\/08\/20\/french-wealth-tax-ifi-british-residents-after-brexit-declaration-debts-appeal\/","title":{"rendered":"French Wealth Tax (IFI) for British Residents After Brexit: Declaration, Debts, Five-Year Relief and How to Appeal"},"content":{"rendered":"

Moving from the United Kingdom to France can make a property owner think first about residence permits, income tax and the annual council or property bill. A separate question arises when the net value of property interests reaches the French wealth-tax threshold. The imp\u00f4t sur la fortune immobili\u00e8re<\/em> (IFI) is France\u2019s annual tax on taxable real-estate wealth. It is not taxe fonci\u00e8re<\/em>, the local property-ownership tax, and it is not a tax on the purchase price of a home.<\/p>\n

For a British citizen, the analysis has two stages. France first asks whether the person is French tax-resident or non-resident and what property or property-rich company interests are held on 1 January. The calculation then deducts permitted debts and applies the threshold and progressive rates. A France\u2013UK treaty rule and France\u2019s domestic newcomer rule can alter the treatment of property outside France, but neither should be applied from a general internet summary without checking nationality, residence history and the wording of the current declaration.<\/p>\n

This guide focuses on the person rather than the purchase process: a British owner, resident, pensioner or family member with French property exposure. It explains the declaration, the five-year issue, mortgages and valuation evidence, and the steps after an assessment or penalty. The practical objective is to build a dated evidence file before the French tax deadline, then challenge an incorrect base or procedural decision without losing the payment or court timetable.<\/p>\n

I. When must a British citizen declare French wealth tax after Brexit?<\/h2>\n

A. What does the \u20ac1.3 million IFI threshold cover for a UK owner or French resident?<\/h3>\n

IFI is assessed by reference to the net value of taxable real-estate assets on 1 January of the relevant year. The starting point is Article 964 of the French General Tax Code<\/a>. Its opening sentence says: \u00ab Il est institu\u00e9 un imp\u00f4t annuel sur les actifs immobiliers d\u00e9sign\u00e9 sous le nom d’imp\u00f4t sur la fortune immobili\u00e8re. \u00bb In English, France has created an annual tax on real-estate assets, rather than a general tax on every form of wealth.<\/p>\n

The threshold is not a \u20ac1.3 million exemption applied separately to each house. It is a threshold for the taxable household\u2019s net real-estate wealth. A married couple, a couple treated as jointly assessed under French rules, and dependent minor children may have to be considered together. A British couple should therefore map ownership, usufruct or life-interest rights, bare ownership, jointly held homes and interests held through companies before deciding that each person is below the threshold.<\/p>\n

A person who is French tax-resident is generally assessed on taxable real estate in France and abroad, subject to applicable statutory exclusions and tax treaties. A person who is not French tax-resident is generally assessed on French real estate and on the French real-estate fraction of certain interests in companies or investment structures. Immigration status is not the same as tax residence: holding a French residence card does not by itself answer the IFI question, and spending time in France without the relevant tax-residence facts does not automatically make a person non-resident.<\/p>\n

Article 965 of the General Tax Code<\/a> defines the base by reference to the net value on 1 January. The text begins: \u00ab L’assiette de l’imp\u00f4t sur la fortune immobili\u00e8re est constitu\u00e9e par la valeur nette au 1er janvier de l’ann\u00e9e \u00bb. The date matters. A sale completed on 2 January does not necessarily remove the asset from the 1 January base, while a purchase completed before 1 January may matter even if the deed or tax return is dealt with later. Bank balances, ISA investments and ordinary UK pension rights are not simply added to the IFI base as cash or pension wealth; a company, fund or structure with underlying taxable French property can require a separate look-through calculation.<\/p>\n

The same issue arises with a French soci\u00e9t\u00e9 civile immobili\u00e8re<\/em> (SCI<\/a>), meaning a French civil property company. The relevant value is not automatically the company\u2019s whole balance sheet. The taxable part may correspond to the value of real-estate rights represented by the shares, with exclusions and liabilities assessed under the IFI rules. A British family that owns a holiday home through an SCI should keep the articles of association, share register, accounts, loan agreements and a property valuation. The fact that the family owns shares rather than a deed in each individual\u2019s name does not settle the tax result.<\/p>\n

There is also an important boundary between IFI and the local property bill. Taxe fonci\u00e8re<\/em> is a French local tax connected with ownership of built property. It can be relevant as a financial liability or as evidence about ownership, but paying it does not replace an IFI declaration. Conversely, an IFI assessment does not replace the annual taxe fonci\u00e8re<\/em> notice. The two taxes have different bases, authorities, deadlines and remedies.<\/p>\n

French guidance explains the practical filing trigger as net taxable property above \u20ac1.3 million on 1 January. The official French tax administration IFI declaration page<\/a> directs taxpayers to the IFI annex to the annual income-tax return and describes the filing arrangements for non-residents. The Service-Public explanation of IFI<\/a> also states that the calculation starts with the net value on 1 January after justified debts. Those pages are useful for forms, but they do not replace a property-by-property legal calculation.<\/p>\n

For a British owner, the first working document should be a 1 January schedule in euros. List each property or qualifying interest, the legal owner, the country, the gross market value, the debt claimed against it, the basis for the value and the evidence available. Keep the original sterling figures as well as the exchange-rate method. If the person is French-resident, add non-French property. If the person is non-resident, identify French property and any French-property component in a company. This schedule makes it possible to see whether the \u20ac1.3 million threshold is crossed before the form is completed.<\/p>\n

UK residence must be checked separately under UK rules. The current GOV.UK residence guidance<\/a> explains the United Kingdom\u2019s statutory residence approach and split-year questions. That is relevant to the UK return and to the evidence of a move, but a UK residence conclusion does not by itself determine French residence. A person can be resident under one country\u2019s domestic rules and still need the France\u2013UK treaty tie-breaker. The IFI file should therefore contain travel dates, home availability, family and work facts, tax returns and the treaty analysis rather than only a residence permit.<\/p>\n

B. Does the France\u2013UK treaty protect a new British resident\u2019s UK property for five years?<\/h3>\n

Two different five-year mechanisms can be confused. France\u2019s domestic rule can protect the foreign real estate of a person who was not French-domiciled for the required preceding calendar years and who becomes French tax-resident. Separately, the France\u2013UK tax treaty contains a rule directed at a UK national who becomes resident in France. The exact result depends on the person\u2019s previous French residence, nationality, the date of the move, any French nationality, and whether the person is treaty-resident in France.<\/p>\n

The current domestic rule is found in Article 964. It is not a universal \u201cBrexit exemption\u201d and it does not exclude French property. If a British citizen moves to France after having lived in the United Kingdom, the calculation must identify whether the person was French-domiciled during the statutory preceding calendar years. The period is expressed by reference to calendar years, not simply by counting sixty months from the day the removal van arrived. A person moving in September 2026 should record the precise date of the move, earlier French stays, the location of the home and family, and the first French return; the filing position should then be checked against the version of Article 964 applying to the relevant year.<\/p>\n

The treaty is published in France by the official decree publishing the France\u2013UK convention<\/a>. Article 2(2) says: \u00ab La pr\u00e9sente Convention s’applique aussi aux imp\u00f4ts de nature identique ou analogue \u00bb. Article 29(3), in the French text, refers to a UK national resident in France who does not also possess French nationality and says that the foreign assets \u00ab n’entrent pas dans l’assiette de l’imp\u00f4t aff\u00e9rent \u00e0 chacune de ces cinq ann\u00e9es \u00bb. The official Article 29 treaty text on L\u00e9gifrance<\/a> should be read with the full convention, not with a shortened quote.<\/p>\n

There is a drafting point that deserves care. Article 29(3) names the former French imp\u00f4t de solidarit\u00e9 sur la fortune<\/em> (ISF), the predecessor of IFI. Article 2(2) refers to taxes of an identical or analogous nature that replace or supplement the listed taxes. The French tax administration\u2019s BOFiP guidance on IFI residence and the five-year rule<\/a> confirms that treaty provisions can affect the ordinary domestic analysis, but the treaty wording still has to be applied to the person and the tax year. A British national should not assume that the words \u201cfive years\u201d automatically remove all UK property from every IFI return.<\/p>\n

The nationality condition also matters. The treaty wording is directed to a person who possesses UK nationality without simultaneously possessing French nationality. A dual national cannot simply rely on the headline \u201cBritish resident\u201d description. A married couple may also have different nationality and residence histories, while the French household calculation can bring their assets together. These facts should be written out rather than left to an online form\u2019s default answers.<\/p>\n

The treaty rule does not protect French property. A home in Provence, a French rental flat, a French property-rich SCI or a French real-estate interest remains the first place to test the IFI base. The rule concerns property outside France and does not cancel income tax, social-security contributions, local property taxes, inheritance tax or UK reporting. It also does not decide whether a person needs a visa, a residence permit or an assurance maladie registration.<\/p>\n

Do not discard UK property evidence during the protected period. Keep title documents, mortgage statements, valuation reports, exchange-rate workings and proof of the date on which French residence began. The tax office may need to understand why the property was outside the taxable base, and the same facts may later matter when the relief ends. A schedule that says \u201cUK home, exempt\u201d without the treaty article, nationality analysis and calendar-year computation is difficult to defend.<\/p>\n

A sensible approach is to prepare two calculations. The first applies the domestic Article 964 residence and newcomer rules. The second tests the treaty\u2019s residence and nationality language, including Article 2(2) and Article 29. Explain any difference in a short written memo and retain the sources used. If the treatment is uncertain, ask the French tax office or a French tax lawyer for a written position before the return is filed. A cautious written position is more useful than a confident but unsupported omission.<\/p>\n

II. How should a British taxpayer value, document and challenge an IFI assessment?<\/h2>\n

A. Which debts, valuation evidence and forms reduce the taxable base?<\/h3>\n

The IFI base is a net figure, but \u201cnet\u201d does not mean that every personal liability can be subtracted. The debt must meet the statutory conditions and exist on 1 January. Article 974 of the General Tax Code<\/a> begins: \u00ab Sont d\u00e9ductibles de la valeur des biens ou droits immobiliers et des parts ou actions taxables les dettes, existantes au 1er janvier de l’ann\u00e9e d’imposition \u00bb. The debt must be effectively borne by the relevant taxable person and connected with taxable assets or an authorised acquisition, construction, improvement, repair, maintenance or tax expense.<\/p>\n

A UK mortgage secured on a French property can be relevant, but the file should show the borrower, the property financed, the balance outstanding on 1 January, the repayment schedule, the interest and capital split, and the exchange-rate conversion into euros. A mortgage secured on a UK home is not automatically deductible merely because the borrower also owns French property. If the borrowing financed a mixed portfolio, the allocation must be explained. Bank statements, completion statements and the lender\u2019s year-end certificate are stronger than a rounded figure typed into the return.<\/p>\n

Article 974 contains anti-avoidance and limitation rules. Loans between members of the same family, loans from an entity controlled by the taxpayer or family, and debt arranged mainly to reduce IFI may be restricted or excluded. There is also a special limitation where the taxable real-estate value is above \u20ac5 million and the debt is disproportionately high: the part above the statutory threshold is not necessarily deductible in full. A British family using an intra-family loan or a company loan should provide the commercial purpose, repayment terms, interest, security and actual payments. A paper loan with no credible repayment behaviour is vulnerable.<\/p>\n

Valuation is often the largest disputed item. Article 973<\/a> applies the inheritance-tax valuation rules and provides that \u00ab un abattement de 30 % est effectu\u00e9 sur la valeur v\u00e9nale r\u00e9elle de l’immeuble \u00bb when the property is occupied as the owner\u2019s principal residence. The reduction is not a general 30% discount for every French house, and only one home can benefit from the principal-residence reduction in a joint assessment. A holiday home, an investment property and a home made available to a family member need separate analysis.<\/p>\n

\u201cMarket value\u201d means the price the property could achieve in a real market on the relevant date, taking account of its legal and physical condition. A recent Tribunal judiciaire de Nanterre decision, 26 November 2025, case no. 24\/01113, published through the official Cour de cassation database<\/a>, states: \u00ab La valeur v\u00e9nale d\u2019un bien s\u2019entend du prix qui pourrait en \u00eatre obtenu par le jeu de l\u2019offre et de la demande dans un march\u00e9 r\u00e9el \u00bb. The court\u2019s approach rewards comparable transactions and evidence tied to the date, not a generic estate-agent estimate prepared years later.<\/p>\n

A second verified decision, from the Tribunal judiciaire de Chamb\u00e9ry on 1 June 2026, case no. 24\/01090, describes the same exercise as an objective value based on the local market: \u00ab La valeur v\u00e9nale est une valeur objective, fonction des caract\u00e8res sp\u00e9cifiques d’un bien et des donn\u00e9es du march\u00e9 local. \u00bb The official decision page<\/a> is useful when building a comparable schedule. Record the address, living area, land, floor, access, condition, planning constraints, tenancy, works, energy performance and the date and price of each comparable.<\/p>\n

For a British owner, sterling evidence should not be silently converted at an unexplained rate. Preserve the original valuation, the date, the source of the exchange rate and the calculation in euros. If the property is in an area with thin sales data, add several types of evidence: completed sales, a reasoned local valuation, photographs, repair estimates, rental restrictions, planning documents, lease terms and any failed sale. The aim is not to select the lowest number; it is to demonstrate why the reported number reflects the property\u2019s real condition on 1 January.<\/p>\n

The rate scale is progressive. Article 977 of the General Tax Code<\/a> applies bands from 0% up to \u20ac800,000, then 0.50%, 0.70%, 1%, 1.25% and 1.50% as the net taxable base rises. The smoothing mechanism around \u20ac1.3 million can affect the result. A taxpayer should calculate the bands from the net base rather than multiply the whole property value by the top rate.<\/p>\n

Article 982<\/a> requires the taxpayer to state the gross and net taxable values on the annual declaration and to attach the relevant annexes. The text says: \u00ab Les redevables mentionnent la valeur brute et la valeur nette taxable \u00bb. The French tax administration\u2019s English-language guidance for people owning property in France or abroad<\/a> and its non-resident pages explain which forms may apply, including the IFI annex and, for some non-residents without French income, the dedicated non-resident route. Check the current year\u2019s form rather than copying last year\u2019s box number.<\/p>\n

A reliable document pack should contain:<\/p>\n