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 impôt sur la fortune immobilière (IFI) is France’s annual tax on taxable real-estate wealth. It is not taxe foncière, the local property-ownership tax, and it is not a tax on the purchase price of a home.
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–UK treaty rule and France’s 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.
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.
I. When must a British citizen declare French wealth tax after Brexit?
A. What does the €1.3 million IFI threshold cover for a UK owner or French resident?
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. Its opening sentence says: « Il est institué un impôt annuel sur les actifs immobiliers désigné sous le nom d’impôt sur la fortune immobilière. » In English, France has created an annual tax on real-estate assets, rather than a general tax on every form of wealth.
The threshold is not a €1.3 million exemption applied separately to each house. It is a threshold for the taxable household’s 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.
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.
Article 965 of the General Tax Code defines the base by reference to the net value on 1 January. The text begins: « L’assiette de l’impôt sur la fortune immobilière est constituée par la valeur nette au 1er janvier de l’année ». 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.
The same issue arises with a French société civile immobilière (SCI), meaning a French civil property company. The relevant value is not automatically the company’s 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’s name does not settle the tax result.
There is also an important boundary between IFI and the local property bill. Taxe foncière 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 foncière notice. The two taxes have different bases, authorities, deadlines and remedies.
French guidance explains the practical filing trigger as net taxable property above €1.3 million on 1 January. The official French tax administration IFI declaration page 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 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.
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 €1.3 million threshold is crossed before the form is completed.
UK residence must be checked separately under UK rules. The current GOV.UK residence guidance explains the United Kingdom’s 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’s domestic rules and still need the France–UK 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.
B. Does the France–UK treaty protect a new British resident’s UK property for five years?
Two different five-year mechanisms can be confused. France’s 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–UK tax treaty contains a rule directed at a UK national who becomes resident in France. The exact result depends on the person’s previous French residence, nationality, the date of the move, any French nationality, and whether the person is treaty-resident in France.
The current domestic rule is found in Article 964. It is not a universal “Brexit exemption” 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.
The treaty is published in France by the official decree publishing the France–UK convention. Article 2(2) says: « La présente Convention s’applique aussi aux impôts de nature identique ou analogue ». 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 « n’entrent pas dans l’assiette de l’impôt afférent à chacune de ces cinq années ». The official Article 29 treaty text on Légifrance should be read with the full convention, not with a shortened quote.
There is a drafting point that deserves care. Article 29(3) names the former French impôt de solidarité sur la fortune (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’s BOFiP guidance on IFI residence and the five-year rule 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 “five years” automatically remove all UK property from every IFI return.
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 “British resident” 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’s default answers.
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.
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 “UK home, exempt” without the treaty article, nationality analysis and calendar-year computation is difficult to defend.
A sensible approach is to prepare two calculations. The first applies the domestic Article 964 residence and newcomer rules. The second tests the treaty’s 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.
II. How should a British taxpayer value, document and challenge an IFI assessment?
A. Which debts, valuation evidence and forms reduce the taxable base?
The IFI base is a net figure, but “net” 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 begins: « 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 ». 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.
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’s year-end certificate are stronger than a rounded figure typed into the return.
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 €5 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.
Valuation is often the largest disputed item. Article 973 applies the inheritance-tax valuation rules and provides that « un abattement de 30 % est effectué sur la valeur vénale réelle de l’immeuble » when the property is occupied as the owner’s 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.
“Market value” 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, states: « La valeur vénale d’un bien s’entend du prix qui pourrait en être obtenu par le jeu de l’offre et de la demande dans un marché réel ». The court’s approach rewards comparable transactions and evidence tied to the date, not a generic estate-agent estimate prepared years later.
A second verified decision, from the Tribunal judiciaire de Chambéry on 1 June 2026, case no. 24/01090, describes the same exercise as an objective value based on the local market: « La valeur vénale est une valeur objective, fonction des caractères spécifiques d’un bien et des données du marché local. » The official decision page 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.
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’s real condition on 1 January.
The rate scale is progressive. Article 977 of the General Tax Code applies bands from 0% up to €800,000, then 0.50%, 0.70%, 1%, 1.25% and 1.50% as the net taxable base rises. The smoothing mechanism around €1.3 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.
Article 982 requires the taxpayer to state the gross and net taxable values on the annual declaration and to attach the relevant annexes. The text says: « Les redevables mentionnent la valeur brute et la valeur nette taxable ». The French tax administration’s English-language guidance for people owning property in France or abroad 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’s form rather than copying last year’s box number.
A reliable document pack should contain:
- the 1 January ownership schedule, title deeds, SCI share records and any usufruct or bare-ownership instrument;
- a valuation table with comparable sales and a separate explanation for each material adjustment;
- mortgage or loan certificates showing the balance and creditor on 1 January, with sterling-to-euro workings;
- evidence for the principal-residence reduction, if claimed, including occupancy and the absence of a second claim;
- the French and UK residence timeline, nationality evidence and the Article 964 and treaty analysis;
- the completed form, calculations, source documents and a copy of the electronic or postal submission receipt.
That pack also protects the taxpayer if the property is held through an SCI or another company. Explain the underlying property value, the percentage represented by the shares, the company’s genuine liabilities and any assets that are not taxable real estate. The value of the shares should not be reduced by a vague “minority discount” without a legal and market explanation. If a property is jointly held, show the ownership fractions and the household position rather than using a single blended number.
B. What should you do if France overvalues the property, rejects a debt or adds penalties?
The first document to classify is the French notice. It may be an assessment, a request for information, a proposed adjustment, a payment notice or a penalty decision. The deadlines and response rights differ. Do not wait for a second letter before preserving the envelope, the online message, the date of receipt and the reference number. Translate the operative part if necessary, but keep the original French wording because the legal deadline is tied to the notice.
If the tax administration sends a proposed adjustment, Article L. 57 of the French Tax Procedure Code requires a reasoned proposal so that the taxpayer can respond. The verified text says: « L’administration adresse au contribuable une proposition de rectification qui doit être motivée de manière à lui permettre de formuler ses observations ». The response should answer each reason separately: the valuation date, the selected comparables, the debt’s legal connection, the treaty or newcomer rule, the form used and the penalty basis.
Reply with a numbered evidence table. For a valuation dispute, place the administration’s figure beside the taxpayer’s figure, identify the difference and cite the document that supports the adjustment. For a mortgage dispute, show the loan contract, the 1 January balance and the property financed. For the five-year issue, set out French residence by calendar year, nationality, treaty residence and the exact foreign assets claimed outside the base. A long narrative without a matching table makes it harder to see which factual proposition is actually disputed.
If the assessment has already been issued, a réclamation contentieuse, meaning a formal tax claim asking the administration to reduce or cancel the assessment, is usually required before judicial proceedings. Article R*196-1 of the Tax Procedure Code states the general rule that claims for taxes other than local direct taxes must be filed by 31 December of the second year following the relevant collection, payment or event year. The notice may contain a more immediately important date, and a corrected or late return can alter the calculation. Check the exact notice and obtain a receipt for the claim.
Ask separately about payment. A claim does not necessarily suspend collection. Under Article L. 277 of the Tax Procedure Code, a taxpayer who disputes the basis or amount may request a suspension of payment; the text says the taxpayer is authorised to defer the contested part « s’il en a expressément formulé la demande dans sa réclamation ». The request must identify the contested amount or bases and should address any guarantee required by the administration. Pay the undisputed amount or explain the position, because an informal email saying “I disagree” is not the same as a properly framed request.
Penalties need their own response. Article 1729 of the General Tax Code provides, among other consequences, a 40% increase for deliberate failure and an 80% increase in an abuse-of-law situation. The administration must identify the factual and legal basis. A mistake in a difficult valuation case is not automatically deliberate conduct. The evidence file should show the method used, the questions asked, the advice obtained and the taxpayer’s cooperation. That does not guarantee cancellation, but it gives the response a factual basis.
Recent decisions show why timing and evidence matter. In a Tribunal judiciaire de Paris decision of 18 June 2026, case no. 24/11060, the court examined a late IFI return and stated: « Cette situation suffit à justifier l’application de la majoration de 10 %. » The decision also explains the filing timetable applied in that case. It is a warning not to assume that the annual income-tax filing date or an extension for one form automatically protects a late IFI filing.
On the other hand, the valuation cases show that a taxpayer can succeed when the market evidence is stronger. The Nanterre decision treated real-market evidence as central, while the Chambéry decision, case no. 24/01090, required attention to the property’s specific features and local market. A British owner should therefore obtain evidence before the response deadline, not wait until a court hearing to commission a valuation that cannot reconstruct the relevant date.
The principal-residence reduction also depends on facts. In a Tribunal judiciaire de Nancy decision of 13 February 2026, case no. 23/00802, the court refused the claimed benefit where the taxpayer had not established habitual and effective residence at the address. The decision says: « ce dernier ne peut aucunement prétendre au bénéfice des abattement et exonération prévus par les articles 973 et 975 ». The lesson is practical: provide utility records, occupation evidence, household facts and a coherent residence timeline, rather than relying on the property being called a “main home” in a UK document.
A complete appeal sequence is usually easier to manage as a timetable:
- record the date of receipt and identify whether the document is a proposal, assessment, payment notice or penalty;
- freeze the 1 January property, debt, residence and nationality evidence;
- prepare a two-column calculation that exposes the disputed value or liability;
- send reasoned observations to a proposed adjustment within its stated period;
- file a formal claim against an assessment and request suspension of payment expressly if needed;
- track the administration’s response and obtain advice on the competent court and the next procedural deadline.
The UK side should be kept separate. A French IFI challenge does not automatically amend a UK self-assessment, pension return, capital-gains position or inheritance planning. The treaty source, UK residence evidence and French property schedule may be used in both countries, but each tax has its own charging rules. If the issue concerns double taxation, ask which tax is actually being charged and whether the treaty provision covers that tax; do not assume that every French property charge is creditable against a UK liability.
Conclusion
A British person with French property should start with the 1 January net-value schedule, not with a guess based on the purchase price or the local property bill. Confirm French tax residence, the household perimeter, direct and company-held property, permitted debt and the €1.3 million threshold. Then test the domestic newcomer rule and the France–UK treaty separately. The treaty’s reference to the former ISF and its nationality condition make a written, fact-specific analysis essential.
If the French administration disagrees, preserve the notice, challenge the valuation or debt with dated evidence, respond to a proposed adjustment and use a formal claim. If payment is disputed, request suspension expressly and address guarantees. The verified decisions show that late filing can produce a penalty, while disciplined market evidence can change a valuation. A carefully indexed file gives a British owner the best chance of correcting the base before a deadline becomes an irreversible procedural problem.
Need a quick opinion on your case
You can arrange a telephone consultation within 48 hours with a lawyer from the firm.
We can review your French property schedule, treaty position, valuation evidence, debt file and appeal timetable.
Call Maître Reda Kohen on +33 6 46 60 58 22.
For a broader first-return checklist, see our guide to making a first French tax return after moving from the UK.