You live in Britain, you own a house in France, and you let it to a tenant who lives there all year. The rent lands in your UK bank account, you already fill in a Self Assessment return for HMRC, and a French tax bill arrives that you did not expect. Which country actually taxes that rent, which French forms do you file from London or Edinburgh, what happens with French social charges when you pay National Insurance at home, and what do you do when the French figure looks wrong? This guide answers each question in turn. It is written for a British reader who is resident in the United Kingdom for tax purposes (in French, a non-résident) and who lets a French property on a long-term basis, whether unfurnished (location nue) or furnished (location meublée). Short holiday lets booked by the night, with tourist registration and change-of-use fines, are a different regime and are not covered here. French legal terms are explained the first time they appear.

France taxes the rent at source because the building stands on French soil. The United Kingdom then taxes your worldwide income but gives credit for the French tax under the France-United Kingdom double tax convention signed on 19 June 2008. Within the French bill, everything turns on one distinction: an unfurnished letting produces revenus fonciers (rental income from unfurnished property), while a furnished letting produces bénéfices industriels et commerciaux, universally shortened to BIC (profits of a commercial-style activity). The two categories have different thresholds, different allowances, different forms and different case law, and the tax office (administration fiscale) regularly reclassifies one into the other during audits. The second half of this guide walks through declaration forms, minimum rates for non-residents, social charges, and the remedies available when you consider the assessment excessive or doubly taxed.

I. Where is your French rental income taxed when you live in Britain?

A. How does France tax your unfurnished rent as revenus fonciers?

French domestic law treats the rent from a building in France as French-source income even when the owner lives abroad. The starting point is Article 164 B of the General Tax Code (Code général des impôts), which provides: « Sont considérés comme revenus de source française : a. Les revenus d’immeubles sis en France ou de droits relatifs à ces immeubles ». In plain English, rent from a house situated in France is French-source income, and France claims the first right to tax it. The France-United Kingdom convention of 19 June 2008 confirms this allocation: income from immovable property situated in France may be taxed in France, while the United Kingdom eliminates double taxation by granting a credit. You therefore declare the same rent twice, once in each country, but you do not pay full tax twice.

Within France, an unfurnished letting falls under Article 14 of the General Tax Code, which states: « Sous réserve des dispositions de l’article 15 , sont compris dans la catégorie des revenus fonciers, lorsqu’ils ne sont pas inclus dans les bénéfices d’une entreprise industrielle, commerciale ou artisanale, d’une exploitation agricole ou d’une profession non commerciale : 1° Les revenus des propriétés bâties, telles que maisons et usines, ainsi que les revenus » of certain fixtures and installations. A house let unfurnished to a tenant who makes it their home is the textbook case of revenus fonciers. The official impots.gouv.fr guidance page for non-residents receiving French property income confirms the practical consequence: rent from letting an unfurnished dwelling is taxed at the progressive income-tax scale under revenus fonciers and also bears social charges at the headline rate of 17.2% (see impots.gouv.fr: non-resident receiving property income). Progressive scale plus social charges at 17.2% is therefore the default picture for an unfurnished let.

Two assessment methods (régimes d’imposition) then compete. Under the simplified micro-foncier regime, Article 32 of the General Tax Code provides: « lorsque le montant du revenu brut annuel défini aux articles 29 et 30 n’excède pas 15 000 €, le revenu imposable correspondant est fixé à une somme égale au montant de ce revenu brut diminué d’un abattement de 30 % ». Gross rents up to 15,000 euros a year are simply reduced by a flat 30% allowance, and you report the gross figure directly on the income return. No detailed expense schedule is needed, but no real expense above 30% can be deducted either, so a year with a new boiler or a roof repair makes the second regime more attractive.

Under the régime réel (actual-expenses method), you deduct the expenses genuinely borne during the year. Article 31 of the General Tax Code opens the list as follows: « I. – Les charges de la propriété déductibles pour la détermination du revenu net comprennent : 1° Pour les propriétés urbaines : a) Les dépenses de réparation et d’entretien effectivement supportées par le propriétaire ; a bis) Les primes d’assurance », and the article continues with management fees, loan interest on the property, and certain irrecoverable tenant charges. A deficit on the French property (déficit foncier) can in principle be set against your other French-source income within limits, but a UK-resident landlord with no other French income will usually carry the mechanics differently, so the real value of the réel lies in years of heavy works. Keep every invoice: French auditors ask for them, and a missing invoice is a disallowed deduction.

One warning matters for British owners who bought through shared ownership structures. If you hold the house through an English-law arrangement or a French property company, the classification can shift, and the yearly French property taxes discussed in our companion guide on yearly French property taxes on a British second home continue to apply on top of the income tax on rents. Council-type taxes and income tax are cumulative, not alternative.

B. How is your furnished let taxed as BIC, and why does the boundary matter?

Furnished letting is treated in France as a commercial-style activity even when the owner is a private individual with a single flat. The rent is not revenus fonciers at all: it is BIC, with its own thresholds, allowances and return. The lead regime is the simplified micro-BIC. Article 50-0 of the General Tax Code sets the framework, and for ordinary long-term furnished lets it provides « d’un abattement de 50 % pour le chiffre d’affaires provenant d’activités de la catégorie mentionnée au 2° », while tourist-furnished accommodation in the specific legal sense now bears only « d’un abattement de 30 % pour le chiffre d’affaires provenant d’activités de la catégorie mentionnée au 1° bis ». In practice, a British owner letting a furnished flat year-round to a tenant who lives there generally claims the 50% allowance within a turnover ceiling that stood at 83,600 euros, whereas classified tourist furniture and similar short-stay categories sit under tighter ceilings and the lower 30% allowance. The exact ceiling applicable to your situation must be checked for the year concerned, because Parliament has moved these thresholds several times since 2023, but the architecture is stable: below the ceiling you declare turnover and the allowance applies automatically; above it, or by election, you fall into the régime réel BIC with depreciation of the building (excluding land), furniture and works.

The boundary between unfurnished and furnished is where audits bite. The administration regularly argues that a supposedly unfurnished let was in substance furnished, or the reverse, and reassesses several years of income in the other category with interest and penalties. The Court of Cassation has confirmed, in the furnished-letting context, that the income at stake belongs to the commercial category: in its judgment of 20 December 2023, No. 22-17.612, concerning blocks of dwellings let furnished, the Commercial Chamber recalled that « Aux termes de l’article 885 R du code général des impôts, alors applicable, sont considérés comme des biens professionnels au titre de l’ISF les locaux d’habitation loués meublés ou destinés à être loués meublés par des personnes louant directement ou indirectement ces locaux, qui, inscrites au registre du commerce et des sociétés en qualité de loueurs professionnels, réalisent plus de 23 000 euros de recettes annuelles et retirent de cette activité plus de 50 % des revenus à raison desquels le foyer fiscal auquel elles appartiennent est soumis à l’impôt sur le revenu dans les catégories des traitements et salaires, bénéfices industriels et commerciaux, bénéfices agricoles, bénéfices non commerciaux, revenus des gérants et associés mentionnés à l’article 62 du même code », and held for the comparison test that « il convient de retenir, non les recettes brutes tirées de l’activité de location meublée professionnelle, mais le bénéfice industriel et commercial net annuel dégagé par cette activité, afin de permettre la comparaison avec l’ensemble des revenus professionnels du foyer fiscal, y compris le bénéfice tiré de la location. » (see Court of Cassation, Commercial Chamber, 20 December 2023, No. 22-17.612). The vocabulary is decisive: furnished letting produces a « bénéfice industriel et commercial », never revenus fonciers, even though the dispute itself concerned wealth-tax thresholds. In an audit, the same logic governs reclassification: photographs at entry and exit, a detailed inventory (inventaire) annexed to the lease, and proof of who owns the furniture decide the category more reliably than the label the parties wrote on the contract.

For a British owner, the practical checklist before choosing is therefore short. If the property is genuinely bare, with the tenant bringing everything including white goods and curtains, revenus fonciers with micro-foncier or réel applies. If you provide beds, cooking equipment, crockery and linen sufficient for normal occupation, you are in furnished territory and BIC applies, with registration consequences: a furnished landlord is expected to register the activity and obtain a SIRET number, to file the professional BIC return, and, above certain turnovers, to consider registration for value added tax and the cotisation foncière des entreprises, the local business tax. Letting your French house while remaining resident in the UK does not exempt you from these French registration duties; the obligations attach to the activity carried on in France. Owners who hesitate between the two categories should compare, with figures, the 30% micro-foncier allowance against the 50% micro-BIC allowance and against the réel in each category for a year with works, because the headline allowance alone can mislead once deductible charges, depreciation and social charges are included.

II. How do you declare, pay and challenge the French bill from the UK?

A. Which French forms, minimum rates, social charges and UK return apply?

France taxes non-residents only on French-source income, but it applies a protective minimum rate. Article 197 A of the General Tax Code states: « l’impôt ne peut, en ce cas, être inférieur à un montant calculé en appliquant un taux de 20 % à la fraction du revenu net imposable inférieure ou égale à la limite supérieure de la deuxième tranche du barème de l’impôt sur le revenu et un taux de 30 % à la fraction supérieure à cette limite ». In other words, your French rental profit is first computed under the ordinary progressive scale, then compared with the tax produced by the 20% and 30% minimum rates, and you pay the higher of the two, unless you can show that the average rate on all your worldwide income would be lower. That escape route, the taux moyen (average-rate claim), requires you to disclose your worldwide earnings to the French authorities with supporting documents, and taxpayers domiciled in the United Kingdom may attach a sworn statement (déclaration sur l’honneur) pending the final paperwork because a mutual assistance and recovery convention covers the United Kingdom. The minimum rate is the single most frequent surprise on British landlords’ assessments, and it is also the lever most often overlooked when it could be reduced.

The constitutional robustness of this minimum-rate mechanism has been tested. In its decision of 3 February 2023, No. 468904, the Conseil d’État summarised the mechanism before ruling on the transmission of a constitutional challenge: « les revenus de source française perçus par des non-résidents sont passibles de l’impôt sur le revenu dont le montant ne peut être inférieur à celui qui résulterait de l’application de taux d’imposition minima prévus au a de l’article 197 A du code général des impôts », adding that where the taxpayer shows a lower average rate on worldwide income, « il est fait application de ce taux sur les revenus de source française imposables » (see Conseil d’État, 3 February 2023, No. 468904). The lesson for a British landlord is procedural: the average rate is never applied automatically. You must claim it, quantify worldwide income, and file the evidence. A bare assertion that British tax is lower achieves nothing.

Social charges (prélèvements sociaux) form the second layer. Persons domiciled in France for tax purposes pay them on investment and property income under Article L136-6 of the Social Security Code, which begins: « Les personnes physiques fiscalement domiciliées en France au sens de l’article 4 B du code général des impôts sont assujetties à une contribution sur les revenus du patrimoine assise sur le montant net retenu pour l’établissement de l’impôt sur le revenu », expressly including « Des revenus fonciers ». Non-residents are brought into the same net by separate provisions for their French property income, at the headline rate of 17.2% recalled above. An exception exists for landlords who are affiliated to the social security scheme of another State and prove it, notably with a portable document S1: they may be relieved of the CSG and CRDS components and bear only the solidarity levy, currently 7.5%. Since Brexit this route depends on your individual social security position under the EU-United Kingdom Trade and Cooperation Agreement and the Withdrawal Agreement, so a British landlord who works and pays National Insurance in the UK should assemble the S1 or certificate of coverage before asserting the reduced rate, and should expect the French authorities to verify it. The cross-border affiliation case law shows how strictly courts examine these claims: in its judgment of 25 September 2025, No. 22-20.036, the Second Civil Chamber of the Court of Cassation dealt with an insured person who, « domicilié en France et travaillant en Suisse, a demandé le 2 juillet 2019 à la caisse primaire d’assurance maladie du Doubs (la caisse) le remboursement des cotisations versées depuis 2016 au titre de son affiliation à l’assurance maladie en France » (see Court of Cassation, 2nd Civil Chamber, 25 September 2025, No. 22-20.036). The outcome turned on documentary proof of genuine foreign affiliation, not on residence assertions, and the same evidential logic governs a British S1 claim against French social charges.

Declaring from the UK is done online through the non-resident portal of impots.gouv.fr. Unfurnished rents go on the general return with, under the réel, the annexed schedule for property income (form 2044); furnished profits go through the professional BIC return (form 2042-C-PRO) with the relevant business schedules. If no French rental income was received in a given year, the official guidance instructs taxpayers to tick box 4BN on return 2042 so the file reflects the position. Payment follows by direct debit or transfer to the non-resident tax office, and late filing draws the standard 10% increase plus monthly interest. Keep the Franco-British paper trail aligned: the figures declared in France feed the foreign-tax-credit computation on your UK Self Assessment return, where HMRC taxes the same rents as overseas property income and credits the French income tax attributable to them.

B. How do you challenge an excessive assessment or double taxation?

French tax disputes begin with a compulsory first step: the written claim to the administration (réclamation contentieuse). You write to the non-resident tax office that issued the assessment, identify each disputed item, state the legal basis, attach the evidence, and request discharge or reduction. The standard time limit runs to 31 December of the second year following the year of the assessment, and the administration normally has six months to reply; silence for six months counts as an implied rejection that opens the door to the court. From the United Kingdom, send the claim through your online personal account (espace particulier) on impots.gouv.fr so the date is stamped, and keep a paper copy with proof of posting for any letter sent by post. Ask expressly for a stay of payment (sursis de paiement) if enforcement would cause difficulty: with adequate guarantees the recovery is suspended while the dispute runs, and without that request the bailiff’s timetable continues independently of your arguments.

Four lines of attack recur for British landlords. First, the category challenge: where the office has taxed an unfurnished let as BIC or a furnished let as revenus fonciers, produce the lease, the inventory, dated photographs, furniture invoices and the tenant’s attestation of what was in the property on arrival. The Paris appeal decision discussed above shows that reclassification stands or falls on this material, and a landlord who can prove bare walls and the tenant’s own furniture reverses the reassessment for the years concerned. Second, the expense challenge: under the réel, every disallowed charge must be contested invoice by invoice, distinguishing genuine improvements (améliorations), which follow specific deduction rules, from deductible repairs and maintenance. Third, the minimum-rate challenge: recompute the worldwide average rate with your UK P60, Self Assessment calculation and evidence of worldwide income, and claim the taux moyen expressly, because the office will not apply it on its own motion. Fourth, the social-charge challenge: where you hold valid British coverage and an S1, claim the exemption from CSG and CRDS with the certificate attached, and pursue the claim through the social-security dispute channel if the levy is maintained.

If the administration rejects the claim in whole or in part, the appeal lies before the administrative court (tribunal administratif), for non-residents generally the Montreuil court in whose area the non-resident tax office sits, within two months of the rejection. Pleadings can be filed from abroad through the Télérecours application, and representation by a lawyer is not compulsory at first instance but is strongly advisable once figures, treaty interpretation or case law are involved. Alongside the domestic route, the double-tax convention offers a mutual agreement procedure: where France and the United Kingdom attribute the same income differently or where the French assessment leaves tax that the United Kingdom will not credit, the competent authorities can be asked to resolve the conflict. That procedure has its own deadlines measured from the first notification of the disputed taxation, so it should be launched in parallel rather than after exhausting domestic remedies. Readers facing the mirror situation, a British resident in France taxed on rents from a flat retained in England, will find the symmetrical analysis in our guide on British landlords in France taxed on UK rental income, which follows the same treaty logic in the opposite direction.

Conclusion

A British resident who lets a French house pays French income tax first and British tax second with credit, and the French computation turns on classification. An unfurnished letting produces revenus fonciers under Article 14 of the General Tax Code, with the 30% micro-foncier allowance up to 15,000 euros of gross rent or the deduction of real charges under Article 31. A furnished letting produces BIC, with the micro-BIC allowances under Article 50-0 or taxation on real profit with depreciation. As a non-resident you face the 20% and 30% minimum rates of Article 197 A unless you claim and prove the worldwide average rate, and you face social charges at 17.2% unless a properly documented S1 position reduces them. Declare through the non-resident portal, keep invoices and inventories capable of withstanding an audit, align the French and British returns so the credit is not lost, and challenge by timely written claim with a stay of payment where needed. The system is demanding but navigable, and each of its traps, from reclassification to the minimum rate to double claims on social charges, has a documented way out for the landlord who prepares the evidence before the dispute arises.