You live in London, New York, Geneva or Dubai, and you own a flat in Paris, a villa on the Riviera or a farmhouse in the Dordogne. Every spring, alongside the familiar income-tax return, a second question arises: do you owe France an annual tax simply for owning that property? Since 1 January 2018, the answer is governed by the impôt sur la fortune immobilière (real-estate wealth tax, known as IFI), which replaced the former impôt de solidarité sur la fortune (solidarity wealth tax, known as ISF) and taxes only real-estate assets. For non-residents, the rules are narrower than for French residents but full of traps: only French real estate counts, yet shares in a société civile immobilière (non-trading property company, known as SCI) are caught, debts are deductible only under strict conditions, the 30 percent reduction for a main home almost never applies to a second home, and the famous cap on the tax is reserved for taxpayers domiciled in France. This guide explains who pays, what counts, how to declare, and how to challenge an assessment, as the law stands on 15 September 2026.
I. Who pays IFI and on what basis
The IFI is an annual tax on real-estate wealth. The statute creating it provides that «Il est institué un impôt annuel sur les actifs immobiliers désigné sous le nom d’impôt sur la fortune immobilière» (An annual tax on real-estate assets is hereby created, called the real-estate wealth tax). Liability arises only when the value of the assets described in Article 965 of the General Tax Code exceeds 1,300,000 euros, since the same article states that «Sont soumises à cet impôt, lorsque la valeur de leurs actifs mentionnés à l’article 965 est supérieure à 1 300 000 €» (Liable to this tax, where the value of their Article 965 assets exceeds 1,300,000 euros). Two points matter immediately for a foreign owner: the threshold is assessed on 1 January of each year, and once the threshold is crossed, the progressive scale applies from 800,000 euros upward, not only on the fraction above 1.3 million. A Paris flat valued at 1,400,000 euros therefore produces tax computed on the bands starting at 800,000 euros, subject to a small smoothing reduction between 1.3 and 1.4 million. Before worrying about rates, however, a non-resident must answer two prior questions: does the tax reach me at all, and which of my assets count?
A. Non-residents are taxed only on their French real estate, directly or through shares
French tax-residents are liable on their worldwide real-estate assets, but non-residents are liable only on French assets. The Code states that «Les personnes physiques n’ayant pas leur domicile fiscal en France» are taxable (Individuals who do not have their tax domicile in France) «à raison des biens et droits immobiliers mentionnés au 1° de l’article 965 situés en France et des parts ou actions de sociétés ou organismes mentionnés au 2° du même article 965 , à hauteur de la fraction de leur valeur représentative de ces mêmes biens et droits immobiliers» (on Article 965(1) real property and rights located in France and on shares in the companies referred to in Article 965(2), up to the fraction of their value representing that French real property). In practice, a non-resident who owns a Paris apartment directly includes its full net value, while a non-resident who holds shares in a French or foreign SCI includes only the fraction of the share value that represents French real estate held directly or indirectly by the company. Foreign real estate is entirely outside the non-resident’s taxable base, which is the mirror image of the resident’s worldwide liability.
The taxable base itself is defined as net value on 1 January. Article 965 provides that «L’assiette de l’impôt sur la fortune immobilière est constituée par la valeur nette au 1er janvier de l’année» (The base of the real-estate wealth tax consists of the net value on 1 January of the year). Net means after deducting qualifying debts, discussed below. The base has two limbs: first, all buildings and land and related rights belonging to the taxpayer and to minor children whose property the taxpayer legally administers; second, shares in companies and entities, French or foreign, up to the fraction representing real estate held directly or indirectly. One statutory clarification matters for foreign families using holding structures: a company that merely manages its own property portfolio is not treated as carrying on an industrial, commercial or professional activity, since Article 966 states that «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» (the management by a company of its own real-estate portfolio is not regarded as an industrial, commercial, craft, agricultural or professional activity). A family SCI that only holds and lets French flats therefore cannot escape the tax by claiming a business exemption; conversely, property genuinely assigned to the taxpayer’s main industrial or commercial activity is exempt under Article 975. Married couples are taxed jointly unless separated, and registered partners and notorious cohabitants are also jointly taxed, which means the 1.3 million threshold applies to the couple’s combined French base, not to each partner separately.
Two reliefs soften the territorial rule. First, newcomers to France who were not tax-resident during the previous five calendar years are taxed for their first five years of French residence only as if they were non-residents, that is on French assets only. This five-year tempering is written into Article 964 itself and helps executives and retirees settling in France with a large foreign portfolio. Second, wealth taxes of a similar nature paid abroad are creditable against the French tax under Article 980, which provides that «Le montant des impôts dont les caractéristiques sont similaires à celles de l’impôt sur la fortune immobilière acquitté, le cas échéant, hors de France est imputable sur l’impôt exigible en France» (Similar wealth taxes paid abroad, if any, are creditable against the tax due in France). The credit is capped at the French tax attributable to the foreign-situated property or the corresponding share fraction, so it mainly benefits French residents with foreign property rather than non-residents, but bilateral treaties may also allocate or eliminate the charge, and any treaty position should be checked before filing. If you are structuring the purchase itself through an SCI or weighing direct ownership against a company, the property team at our Paris real-estate practice can coordinate the civil and tax analysis before you sign.
B. Valuing the property and deducting the loan: the two battles that decide the bill
Assets are assessed at their valeur vénale (open-market value) under the valuation rules used for death duties. For a non-resident this is usually the decisive fight, because the tax administration routinely challenges declared values for Paris and Riviera property. The reference method is comparison: recent sales of comparable properties in the same street or district, adjusted for floor, light, condition, lift, outdoor space and charges. The administration may use its own databases of registered sale prices, and the taxpayer may answer with notarised comparables, estate-agent appraisals and, where needed, an independent expert report. Since the assessment date is fixed at 1 January, sales from the preceding autumn and the following spring are the most probative, while asking prices from portals are weak evidence on both sides. Usufruct and bare ownership must be valued according to the statutory scale, and a property subject to a secure long lease or occupied by a protected tenant is worth less than vacant possession, which must be documented rather than asserted.
One reduction is famous but generally unavailable to non-residents: the 30 percent allowance on the main home. Article 973 provides that «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 percent allowance is applied to the true market value of a building occupied as the owner’s main residence). A non-resident whose French property is a second home cannot claim it, and only one building per jointly taxed household can benefit. Foreign owners sometimes argue that their French flat is their real centre of life; the test is factual occupation as the principal dwelling, and a taxpayer who is tax-resident abroad will struggle to meet it. Do not apply the allowance to a holiday home in the hope that nobody notices: the adjustment, with interest and penalties, will cost far more than the saving.
The second battle concerns debts. Only certain loans reduce the base. Article 974 states that «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» (Deductible from the value of taxable property, rights and shares are debts existing on 1 January of the tax year, contracted by the taxpayer and effectively borne by them, relating to taxable assets). In practice this covers acquisition loans for the French property, including a loan taken to buy SCI shares, and certain repair and maintenance expenditure borne by the owner, in each case pro rata to the taxable fraction. Consumer loans, loans for foreign property, and debts owed to related parties under non-arm’s-length terms are the classic targets of reassessment. Keep the loan agreement, the amortisation table, proof that repayments come from your own funds, and the allocation of each drawdown to the French asset: the file you assemble at purchase is the file that will defend the deduction five years later.
Owners who hold through an SCI face an additional valuation question: what discount, or décote (valuation discount), applies to the shares? The Cour de cassation gave a firm answer on 9 July 2025 in a case about SCI shares reassessed for wealth-tax purposes. It recalled the governing principle that «la valeur vénale des parts des sociétés civiles immobilières doit être appréciée en tenant compte de tous les éléments permettant d’obtenir un chiffre aussi proche que possible de celui qu’aurait entraîné le jeu normal de l’offre et de la demande» (The market value of SCI shares must be assessed taking into account every factor capable of producing a figure as close as possible to the price that normal supply and demand would have produced). On that basis the Court approved the discounts the taxpayer had already obtained, 10 percent for illiquidity of the underlying assets and 10 percent for illiquidity of the shares themselves, but it refused any further 10 percent discount for alleged joint ownership, holding that «la situation de l’associé d’une société civile immobilière n’est pas celle d’un indivisaire» (The position of an SCI shareholder is not that of a co-owner in indivision). Although the 2025 ruling concerned the former ISF for the years 2014 to 2016, its reasoning on market value applies identically to IFI assessments today: claim the documented illiquidity discounts, but do not stack an extra joint-ownership discount on SCI shares, because the Court has now expressly rejected it (Cass. com., 9 July 2025, no. 24-13.540).
II. Declaring, paying and challenging the tax
IFI follows the income-tax calendar. Taxpayers report the gross and net taxable values of their Article 965 assets on the annual return provided for in Article 170, with annexes in the administration’s model form valuing each item. Article 982 states that «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 state the gross value and the net taxable value of their Article 965 assets on the annual return provided for in Article 170). A non-resident with no French income still has to consider this filing obligation whenever the French net base may exceed the threshold, and the valuation date remains 1 January of the tax year. Missing the return entirely is the costliest mistake: it exposes the taxpayer to ex officio assessment and increased penalties, whereas a filed return with a reasoned valuation at least frames any later dispute around evidence rather than procedure.
A. Rates, smoothing, gifts and the cap that non-residents do not get
The scale is progressive. Article 977 sets the bands, providing for the entry band that «Supérieure à 800 000 € et inférieure ou égale à 1 300 000 € 0,50» (Above 800,000 euros up to 1,300,000 euros: 0.50 percent), continuing at 0.70 percent up to 2,570,000 euros, 1 percent up to 5 million, 1.25 percent up to 10 million and 1.50 percent above. Taxpayers whose net base sits between 1.3 and 1.4 million benefit from a smoothing reduction equal to 17,500 euros minus 1.25 percent of the base, which avoids a cliff edge at the threshold. Charitable gifts can reduce the bill: Article 978 allows a credit of 75 percent of qualifying cash gifts and gifts of listed shares to research, higher-education, public-interest foundations and similar bodies, capped at 50,000 euros of tax reduction. For a foreign owner with French philanthropic ties, timing a gift in the year before assessment can be more efficient than paying the tax in full, provided the recipient qualifies under the article.
The most dangerous misunderstanding concerns the cap, or plafonnement (ceiling mechanism). For taxpayers domiciled in France, Article 979 reduces IFI by the excess of total taxes over 75 percent of the previous year’s worldwide net income, stating that «L’impôt sur la fortune immobilière du redevable ayant son domicile fiscal en France est réduit» (The real-estate wealth tax of a taxpayer domiciled in France is reduced). The reduction equals the gap between total taxes and 75 percent of income. The opening words are the whole point: the cap is available only to taxpayers with their tax domicile in France. A non-resident with modest income and a valuable Paris flat gets no ceiling, and the combined burden of IFI, taxe foncière (local property tax) and rental income tax can therefore bite harder than a French resident expects. Case law under the former ISF shows how seriously the courts take the mechanics of any cap claim: on 28 March 2019 the Cour de cassation held that undistributed profits of a family SCI, taxed at the shareholder level under the transparency regime, count as realised income for the cap computation whether or not any dividend was ever paid, since «les revenus nets du contribuable entrant dans le calcul du plafonnement de l’ISF devant s’entendre des revenus réalisés et non nécessairement perçus par le contribuable» (The taxpayer’s net income entering into the wealth-tax cap must be understood as income realised, not necessarily income received) (Cass. com., 28 March 2019, no. 17-23.671). The ruling belongs to the ISF era, but its logic on transparent SCI income carries over to today’s IFI cap for French-domiciled SCI shareholders, while non-residents remain outside the cap altogether.
A final procedural point for owners outside Europe: the tax office may ask non-residents holding French Article 965 assets to appoint a representative in France. Article 983 provides that such persons «peuvent être invitées par le service des impôts à désigner un représentant en France» (may be invited by the tax office to appoint a representative in France), while adding that «l’obligation de désigner un représentant fiscal ne s’applique ni aux personnes qui ont leur domicile fiscal dans un autre Etat membre de l’Union européenne» (the obligation to appoint a tax representative does not apply to persons domiciled in another EU Member State), nor to EEA states with mutual assistance treaties with France. An American, British post-Brexit, Swiss or Gulf owner can therefore be required to name a représentant fiscal (accredited tax representative), who receives the administration’s correspondence and may be pursued for the tax. Choosing that representative at acquisition, rather than under pressure during an audit, is one of the simplest protections a non-European buyer can put in place.
B. Audits and challenges: how a reassessment unfolds and how to answer it
IFI is policed like registration duties. Article 981 provides that «les règles relatives au contrôle et au contentieux des droits d’enregistrement s’appliquent à l’impôt sur la fortune immobilière» (The rules on audit and litigation for registration duties apply to the real-estate wealth tax). Concretely, the administration may question a declared value or a deducted debt, send a reasoned reassessment proposal (proposition de rectification), and the taxpayer has a short deadline, normally thirty days, to accept or reply with observations and evidence. Silence is treated as acceptance, so the reply deadline is the single most important date in the whole procedure. Before going to court, the taxpayer may seek the opinion of the departmental conciliation commission, which in SCI-share cases has been known to accept structured discounts, and must in any event file a formal claim (réclamation) with the administration; only after an express or implied rejection can the dispute be taken to the civil court (tribunal judiciaire), where the administration bears the burden of proving under-valuation but the taxpayer must produce serious comparables to counter its figures.
The 9 July 2025 ruling illustrates the full journey: reassessment of SCI-share values in May 2017 for the years 2014 to 2016, conciliation commission granting two 10 percent discounts, rejection of the claim for a third discount and for partial discharge, assignment of the administration before the court, defeat before the Nancy Court of Appeal on 4 December 2023, and final rejection by the Cour de cassation. The lesson for a foreign owner is procedural as much as substantive: each stage narrows the argument, so the comparables, loan documents and discount methodology must be complete from the first reply to the reassessment, not invented on appeal. Where the dispute turns on a pure question of market value, an expert valuation anchored on registered sales around 1 January of the relevant year carries far more weight than a generic estate-agent letter. Where it turns on debts, the test quoted above from Article 974 is applied strictly: debt existing on 1 January, contracted and effectively borne by the taxpayer, tied to a taxable asset. Interest and penalties follow the standard regime, and persistent failure to file can lead to ex officio assessment where the administration sets the value itself.
Three practical defences recur for non-residents. First, challenge the scope: foreign-situated assets and the non-French fraction of share values do not belong in the base, and the administration occasionally sweeps in an entire SCI holding without applying the French-property fraction required by Article 965(2). Second, challenge the value with dated comparables and, for tenanted or encumbered property, with the lease, rent roll and any occupancy restrictions that depress market price. Third, challenge the denial of deductions by tracing each euro of debt to the French asset with bank statements and notarial deeds. Throughout, keep every document for at least the audit period plus the current year, and remember that the administration’s valuation databases are not infallible: a sale price registered for a renovated top-floor flat is not a comparable for a ground-floor unit with damp, and saying so with photographs and invoices is often what wins the file. Where the reassessment also affects co-owners or the SCI itself, coordinate the replies so that consistent values are defended across all files. Our team handles these disputes for owners based abroad in English from start to finish; see our Paris real-estate practice for how an initial review is organised.
Conclusion
For a non-resident, the IFI is a tax on French real estate only, triggered above 1.3 million euros of net value on 1 January, computed on a progressive scale from 800,000 euros, and declared each year with the income-tax return and its annexes. The traps are all in the details: SCI shares are caught up to their French-property fraction, the 30 percent main-home allowance does not cover a second home, only qualifying debts reduce the base, the cap is reserved for French-domiciled taxpayers, and owners outside the EU and EEA may have to appoint a French tax representative. Valuations are decided by dated comparables and complete files, as the Cour de cassation’s July 2025 ruling on SCI discounts confirms. A foreign owner who values carefully, deducts only documented debts, files on time and answers any reassessment within the deadline will rarely have anything to fear from this tax; one who estimates loosely and ignores the post will pay for it with interest.
Need a quick opinion on your case
If you own French property from abroad and face an IFI declaration, a reassessment or a valuation dispute, you can obtain a telephone consultation with a lawyer of the firm within 48 hours. Call +33 6 46 60 58 22 or write via our contact page with a short description of your property and the tax year concerned.