{"id":2120690,"date":"2026-09-13T10:56:39","date_gmt":"2026-09-13T08:56:39","guid":{"rendered":"https:\/\/kohenavocats.fr\/2026\/09\/13\/british-resident-france-tax-audit-proposition-rectification-treaty-challenge-brexit\/"},"modified":"2026-09-13T10:56:39","modified_gmt":"2026-09-13T08:56:39","slug":"british-resident-france-tax-audit-proposition-rectification-treaty-challenge-brexit","status":"publish","type":"post","link":"https:\/\/kohenavocats.fr\/en\/2026\/09\/13\/british-resident-france-tax-audit-proposition-rectification-treaty-challenge-brexit\/","title":{"rendered":"British Resident in France Hit by a Tax Audit After Brexit: How to Answer the Proposition de Rectification, Prove Your Treaty Relief and Challenge the Bill"},"content":{"rendered":"

You moved to France after Brexit, you file your French tax return every spring, you declare your UK pension or the rent from the house you kept near Manchester, and you assumed the double tax treaty would do the rest. Then a letter arrives in your secure mailbox on impots.gouv.fr with an alarming title: proposition de rectification<\/em>, a notice of proposed reassessment. The French tax office says you owe several thousand euros of extra income tax, plus social charges and penalties, usually because it has reclassified your British income, refused your treaty credit, or added income it found through an automatic data exchange with the United Kingdom. This is not a final bill, and it is not the moment to panic or to pay blindly. It is the opening of a strictly regulated procedure in which you have at least thirty days to answer, the administration must explain itself precisely, and the France-United Kingdom treaty of 19 June 2008 remains fully applicable despite Brexit. This guide explains what the letter means, how to reply within the deadline, what proof the inspecteur expects for your British income, and how to challenge the final bill if the office maintains its position.<\/p>\n

I. You Have Received a Proposition de Rectification in France: What the Letter Means and How to Answer Within 30 Days<\/h2>\n

A. What a Desk Audit and a Proposition de Rectification Mean for a British Resident After Brexit<\/h3>\n

A proposition de rectification<\/em> is the formal document by which the French tax administration tells you that it intends to correct your tax return and increase your tax. For most British residents it arrives after a contr\u00f4le sur pi\u00e8ces<\/em>, a desk audit conducted from the office without any visit to your home. The inspecteur re-examines the returns and documents you already filed, compares them with information received from third parties and from the United Kingdom under the automatic exchange of information, and concludes that something is missing or wrong. A well-known example ended up before the administrative court of appeal of Nantes: the tax household of an airline pilot employed by a British company had been subjected to exactly such a desk audit, at the end of which reassessments of 2014 income tax were proposed, reinstating 54,834 euros of British-source income and refusing a tax credit (CAA Nantes, 17 December 2020, No. 19NT00334, full decision on L\u00e9gifrance<\/a>). Your case may involve a pension, rental income or salary rather than flight crew pay, but the procedure is identical.<\/p>\n

The starting point of the inspecteur’s reasoning is always French domestic law. Article 4 A of the French Tax Code<\/a> provides that: “Les personnes qui ont en France leur domicile fiscal sont passibles de l’imp\u00f4t sur le revenu en raison de l’ensemble de leurs revenus.” In plain English, once you are treated as tax resident in France, you are taxable on all of your income, including income arising in the United Kingdom. Whether you count as resident is decided by Article 4 B of the Tax Code<\/a>: “Sont consid\u00e9r\u00e9es comme ayant leur domicile fiscal en France au sens de l’article 4 A : a. Les personnes qui ont en France leur foyer ou le lieu de leur s\u00e9jour principal ;” Your foyer<\/em>, your home and family centre of life, or your principal place of stay, your professional activity, or the centre of your economic interests can each be enough. Most British readers of this article live in France year-round and meet the first test without difficulty, so the administration taxes your worldwide income first and examines the treaty second.<\/p>\n

Your declaration duties follow from Article 170 of the Tax Code<\/a>, which requires every person liable to income tax to file a detailed return of income, family charges and the other elements needed to compute the tax. For a British resident that means reporting UK-source amounts on the main return and on the foreign-income annex, form 2047, with each item allocated to the correct category: salaries and pensions fall under Article 79 of the Tax Code<\/a>, which brings wages, allowances, salaries, pensions and life annuities into total income. The typical triggers for a reassessment are easy to list once you know where inspecteurs look: UK income entered on the wrong line or in the wrong category, a treaty credit claimed on form 2047 that the office considers undocumented, British income omitted because you believed it was taxable only in the United Kingdom, or a mismatch between your return and data received from the British authorities. None of these triggers means the administration is automatically right, and none of them removes your treaty rights.<\/p>\n

One reassurance belongs at the very beginning. Brexit did not terminate the tax treaty between France and the United Kingdom. The applicable instrument is the convention signed in London on 19 June 2008 for the avoidance of double taxation and the prevention of fiscal evasion with respect to taxes on income and on capital gains, published in France by Decree No. 2010-20 of 7 January 2010 (Journal officiel, treaty annex). It continues to allocate taxing rights between the two states and to provide the credit mechanism examined below. An inspecteur sometimes behaves as though the treaty exempts or protects nothing until you prove otherwise; the correct approach is the reverse, and the courts apply the treaty exactly as before Brexit, as the Nantes pilot decision of 2020 confirms.<\/p>\n

The letter itself follows a standard shape. It identifies the years concerned, states the amounts of the envisaged increases, cites the legal provisions relied upon, indicates the income category, and invites you to send written observations or to accept. It may also propose a meeting. Keep the envelope or the electronic notification with its date, because every deadline in the procedure runs from receipt, and keep paying your current undisputed taxes normally: the reassessment is only a proposal until the administration confirms it.<\/p>\n

B. How to Check the Letter’s Reasoning and Reply Before the 30-Day Deadline Expires<\/h3>\n

The single most important rule is the calendar. Article L. 11 of the Tax Procedure Book<\/a> (Livre des proc\u00e9dures fiscales<\/em>, the statute governing audits, reassessments and disputes) fixes the default period in these terms: “A moins qu’un d\u00e9lai ne soit pr\u00e9vu par le pr\u00e9sent livre, le d\u00e9lai accord\u00e9 aux contribuables pour r\u00e9pondre aux demandes de renseignements, de justifications ou d’\u00e9claircissements et, d’une mani\u00e8re g\u00e9n\u00e9rale, \u00e0 toute notification \u00e9manant d’un agent de l’administration des imp\u00f4ts est fix\u00e9 \u00e0 trente jours \u00e0 compter de la r\u00e9ception de cette notification.” You therefore have thirty days from receipt to send your written observations. The same Article L. 57 of the Tax Procedure Book<\/a> adds a valuable safety valve: “Sur demande du contribuable re\u00e7ue par l’administration avant l’expiration du d\u00e9lai mentionn\u00e9 \u00e0 l’article L. 11 , ce d\u00e9lai est prorog\u00e9 de trente jours.” If you need more time to gather British documents, ask in writing before the first period expires and you gain a second thirty days. Send everything by registered letter with acknowledgement of receipt or through the secure messaging of your personal account on impots.gouv.fr, and keep proof of dispatch.<\/p>\n

Silence is the worst option. If you do not reply, the administration treats the proposal as tacitly accepted, confirms the reassessment and sends the collection notice, the avis de mise en recouvrement<\/em>. You can still challenge that notice, as explained in Part II, but you will have lost the cheapest opportunity to kill the reassessment at birth, and penalties for late dispute become harder to contain. Conversely, you are entitled to accept part of the proposal and contest the rest: accept in writing what is genuinely correct, for example a small omission, and dispute the treaty point with reasons and evidence. A partial acceptance does not weaken the remainder of your defence.<\/p>\n

Before drafting a single paragraph of reply, audit the letter’s reasoning against the motivation standard the courts enforce. Article L. 57<\/a> opens with the governing sentence: “L’administration adresse au contribuable une proposition de rectification qui doit \u00eatre motiv\u00e9e de mani\u00e8re \u00e0 lui permettre de formuler ses observations ou de faire conna\u00eetre son acceptation.” The administrative court of appeal of Paris has spelled out what that sentence demands in practice: “l’administration doit indiquer au contribuable, dans la proposition de rectification, les motifs et le montant des rehaussements envisag\u00e9s, leur fondement l\u00e9gal et la cat\u00e9gorie de revenus dans laquelle ils sont op\u00e9r\u00e9s, ainsi que les ann\u00e9es d’imposition concern\u00e9es” (CAA Paris, 29 May 2019, No. 18PA01980, full decision on L\u00e9gifrance<\/a>). Check each element in turn: the envisaged amounts, the legal basis cited for each increase, the income category, and the years. A letter that merely asserts that your British income is taxable, without figures, without legal references and without allocating the sums to a category, fails this test.<\/p>\n

The Paris decision goes further and offers a realistic line of attack where the inspecteur has borrowed reasoning from another document. In that case the taxpayer had received a nine-page proposal that reproduced parts of a reassessment addressed to a company without attaching the company’s own notice, reproducing the conclusions while omitting the method used to rebuild turnover and assess deductible charges. The court held that the taxpayer, who “n’a ainsi pas dispos\u00e9 de l’ensemble des informations lui permettant de contester utilement les impositions auxquelles il a \u00e9t\u00e9 personnellement assujetti”, (CAA Paris, 29 May 2019, No. 18PA01980<\/a>) was entitled to argue that his own notice was inadequately reasoned, and it granted full discharge of the remaining income tax and social contributions for 2010 and 2011 with the related penalties. Transposed to your situation, the lesson is concrete: if your notice refers to British data, to an exchange-of-information report, to a computation annex or to another taxpayer’s file without reproducing or attaching the substance, say so expressly and ask for the missing material. An inadequately reasoned notice is a serious procedural defect that can wipe out the whole reassessment, and the administration cannot repair it afterwards.<\/p>\n

Your written observations should then address the substance in an organised file. Number your points, answer each increase separately, state for each whether you accept or contest, cite the treaty article you rely on, and attach indexed exhibits: British payslips or P60 end-of-year certificates, pension statements, rental accounts, bank statements showing the tax withheld, the British tax calculation or SA302 tax year overview, and proof that the income was included in your British taxable base. Ask explicitly for a meeting with the inspecteur if the amounts justify it, and close by requesting, in the alternative, a detailed reasoned response to each of your points. A calm, complete and documented reply within thirty days regularly leads the administration to abandon or reduce the proposal without any court proceedings.<\/p>\n

II. Your UK Income and the France-UK Double Tax Treaty: How to Prove Treaty Relief and Challenge the Final Bill<\/h2>\n

A. How the Treaty Divides Tax Between France and the United Kingdom and What Proof the Inspecteur Expects<\/h3>\n

French judges apply tax treaties through a two-stage method that every British resident should understand, because it dictates how you must present your file. The administrative court of appeal of Nantes recalled the principle in these terms: “Si une convention bilat\u00e9rale conclue en vue d’\u00e9viter les doubles impositions peut, en vertu de l’article 55 de la Constitution, conduire \u00e0 \u00e9carter, sur tel ou tel point, la loi fiscale nationale, elle ne peut pas, par elle-m\u00eame, directement servir de base l\u00e9gale \u00e0 une d\u00e9cision relative \u00e0 l’imposition.” (CAA Nantes, 17 December 2020, No. 19NT00334<\/a>) A treaty can set aside domestic law on a given point by virtue of Article 55 of the Constitution, which gives duly ratified treaties authority superior to statutes, but it cannot by itself found a tax assessment. In practice the judge first asks whether the tax was validly established under French domestic law, which is why your worldwide income is initially caught by Articles 4 A and 79, and only then asks whether the treaty prevents France from keeping the charge. Your observations should mirror that order: acknowledge residence and the domestic starting point where they are correct, then demonstrate precisely which treaty provision removes or reduces the French charge and why its conditions are met on your facts.<\/p>\n

The Nantes pilot case illustrates the mechanism on real facts. The household argued that part of the captain’s salary related to international flights operated by a British-resident airline and was therefore taxable in the United Kingdom under paragraph 3 of Article 15 of the 2008 convention, which covers salaries for employment aboard ships, aircraft or railway vehicles operated in international traffic by a resident enterprise. The court accepted that characterisation as the starting point but added the decisive nuance: “il r\u00e9sulte des stipulations du paragraphe 3 de l’article 24 de cette convention, qui sont applicables aux salaires, que ces r\u00e9mun\u00e9rations peuvent \u00eatre \u00e9galement impos\u00e9es en France sous r\u00e9serve de l’imputation d’un cr\u00e9dit d’imp\u00f4t correspondant au montant de l’imp\u00f4t pay\u00e9 au Royaume-Uni.” (CAA Nantes, 17 December 2020, No. 19NT00334<\/a>) In other words, the France-United Kingdom treaty of 2008 generally works by credit rather than by exemption for this kind of income: France keeps the right to tax, but must grant a credit equal to the British tax, capped at the amount of French tax attributable to the same income and computed, for progressively taxed income, by applying to the net foreign income the effective rate borne by your total net taxable income. The credit cannot exceed the French tax on that income, which is why the computation annex of your notice deserves close scrutiny: an excessive French base, a wrong category or a missing apportionment directly inflates the residual French charge after credit.<\/p>\n

The same decision contains the warning that decides many files. The taxpayers lost because of evidence, not because of legal principle. The pilot had not shown that the disputed slice of salary had entered the British taxable base, and the court therefore held that “c’est \u00e0 bon droit que l’administration fiscale a estim\u00e9 qu’en application des stipulations du paragraphe 3 de l’article 24 de la convention du 19 juin 2008, les requ\u00e9rants ne pouvaient b\u00e9n\u00e9ficier d’un cr\u00e9dit d’imp\u00f4t imputable sur l’imp\u00f4t fran\u00e7ais” (CAA Nantes, 17 December 2020, No. 19NT00334<\/a>). No proof of actual British taxation on the disputed slice of income means no credit. This burden of proof rests on you for each category of income, and British paperwork must be translated into terms the French inspecteur recognises. Assemble a proof pack adapted to your income: for salary, the P60 end-of-year certificate, monthly payslips, the employment contract showing the British employer, and the British tax year overview or SA302 calculation proving the salary entered the British taxable base; for a pension, the annual P60 for pensioners or provider statements plus evidence of tax deducted at source; for rental income from a house you kept in the United Kingdom, the letting accounts, the British Self Assessment return and its calculation, and bank statements showing the rent and any British tax paid; for dividends or interest, the vouchers and the British return entries. The British government’s own guidance confirms the symmetry of the system from the London side, explaining when relief is available to people taxed in more than one country (GOV.UK, Tax on foreign income<\/a>). Where you need an official attestation of British residence or of tax paid, your HMRC personal tax account, a certificate of residence, or a request to HMRC for confirmation of the figures can close the gap.<\/p>\n

Two practical traps deserve special attention. First, the explanatory notes to forms never replace the law. In the Nantes case the taxpayers invoked the notice accompanying form 2047, and the court answered bluntly: “La notice de l’imprim\u00e9 n\u00b0 2047 n’est pas au nombre des instructions ou circulaires publi\u00e9es par lesquelles l’administration fiscale fait conna\u00eetre son interpr\u00e9tation des textes fiscaux.” (CAA Nantes, 17 December 2020, No. 19NT00334<\/a>) You therefore cannot rely on the 2047 booklet against the administration on the basis of Article L. 80 A of the Tax Procedure Book<\/a>. Build your argument on the treaty text, the statute and published doctrine such as the BOFiP guidance on reassessment procedures (BOI-CF-IOR-10-50-30)<\/a>, not on a form’s help note. Second, mind the years and the slices. Treaty relief is granted income by income and year by year: a credit proved for your 2023 pension does not automatically cover your 2023 rent, and British tax years running from 6 April to 5 April never coincide exactly with French calendar years, so apportionment schedules showing how each British document maps onto each French year are worth their weight in gold.<\/p>\n

Pensions and rental income, the two most common British sources in French audits, each call for a short tailored note in your reply. For pensions, identify whether the pension is governmental or private, because the treaty allocates them differently, state where the pension was actually taxed, and reconcile the gross pension, the British tax deducted and the French declared amount line by line. For rent from a British property, recall that immovable-property income is generally taxable where the property stands, with France granting relief under Article 24, and show the full chain from gross rent through British deductible expenses to the net figure taxed in London and declared in Paris. For salary for work physically performed in the United Kingdom while you live in France, map each period of presence to payslips and travel records. Precision on these points is what transforms a generic complaint about double taxation into a documented treaty claim the inspecteur can accept.<\/p>\n

B. How to Challenge the Final Bill: Formal Claim, Tax Court and Penalties<\/h3>\n

If the administration maintains the reassessment after your observations, it issues the avis de mise en recouvrement<\/em>, the collection notice that converts the proposal into an enforceable tax debt. Do not mistake this notice for the end of the road: it opens the second phase of the dispute, the formal claim known as r\u00e9clamation<\/em>, followed if necessary by proceedings before the tax judge. The procedural map is summarised for the public by service-public.fr (Tax claims and legal remedies)<\/a>, and the claim itself is compulsory. Article R*190-1 of the Tax Procedure Book<\/a> states the rule: “Le contribuable qui d\u00e9sire contester tout ou partie d’un imp\u00f4t qui le concerne doit d’abord adresser une r\u00e9clamation au service territorial, selon le cas, de la direction g\u00e9n\u00e9rale des finances publiques ou de la direction g\u00e9n\u00e9rale des douanes et droits indirects dont d\u00e9pend le lieu de l’imposition.” You must therefore write first to the tax office for the place of assessment, setting out each disputed head of charge, the treaty and statutory provisions relied upon, and the exhibits, before any court will hear you. File the claim as soon as the collection notice arrives, because the general time limit for contesting an assessment expires at the end of the second calendar year following the year of the collection notice, and missing it closes the file permanently.<\/p>\n

The claim should be more than a repetition of your first letter. Attach the complete treaty proof pack, now finalised with any British documents that arrived late, add the computation showing the correct credit and the residual French tax you accept, and raise expressly every procedural defect you identified at the proposal stage, including any motivation shortfall under Article L. 57. Ask for a full discharge of the disputed increases in principal, interest and penalties, and request suspension of payment of the contested amounts while the claim is examined, offering guarantees if the office requires them. In practice the administration must decide within six months; silence at the end of that period counts as an implied rejection and opens the way to court. Keep copies of the claim, its enclosures and proof of sending together with the proposal file, because the judge will review the same papers.<\/p>\n

If the claim is rejected expressly or implicitly, the competent court is the tribunal administratif<\/em>, the administrative court, for the place of assessment. Article R. 421-1 of the Administrative Justice Code<\/a> sets the filing period: “La juridiction ne peut \u00eatre saisie que par voie de recours form\u00e9 contre une d\u00e9cision, et ce, dans les deux mois \u00e0 partir de la notification ou de la publication de la d\u00e9cision attaqu\u00e9e.” You have two months from notification of the rejection to lodge the application, and the application must challenge the rejection decision while restating the full dispute on the tax itself. Before the court, the two-stage treaty analysis described above governs: the judge verifies domestic law first, then the treaty. The Nantes and Paris decisions show both possible endings. The pilot’s household lost on the treaty credit for want of proof that the disputed salary had entered the British taxable base, while the Paris taxpayer obtained full discharge with penalties because his notice was inadequately reasoned. Your file should therefore plead both strings to the bow in the alternative: defective motivation of the proposal and, on the substance, documented entitlement to the treaty credit.<\/p>\n

A word on penalties, which often represent a large share of the bill and frighten readers unnecessarily. Article 1729 of the Tax Code<\/a> punishes inaccuracies and omissions in returns, with increased penalties where the administration establishes a deliberate failure, and late-payment interest accrues on top. Each penalty must be motivated and proportionate, and each can be contested separately: argue good faith, the genuine complexity of a cross-border treaty position, spontaneous cooperation during the audit, and any first-time or isolated character of the error. Article L. 80 A of the Tax Procedure Book<\/a> protects the taxpayer who relied in good faith on a formal interpretation previously accepted by the administration: “Il ne sera proc\u00e9d\u00e9 \u00e0 aucun rehaussement d’impositions ant\u00e9rieures si la cause du rehaussement poursuivi par l’administration est un diff\u00e9rend sur l’interpr\u00e9tation par le redevable de bonne foi du texte fiscal et s’il est d\u00e9montr\u00e9 que l’interpr\u00e9tation sur laquelle est fond\u00e9e la premi\u00e8re d\u00e9cision a \u00e9t\u00e9, \u00e0 l’\u00e9poque, formellement admise par l’administration.” Published doctrine, prior unchallenged returns on the same treaty reading, and written answers previously given by the administration are the materials of that defence. Challenge the penalties even where you accept part of the principal: courts regularly cancel penalties while maintaining the underlying tax.<\/p>\n

Throughout both phases, keep the file bilingual and chronological. British documents should carry a short French caption or translation of the essential figures, every letter should reference the notice and claim numbers, and every deadline should be calendared with a safety margin. British residents sometimes discover the audit only when opening their online account from the United Kingdom during a summer stay; if a deadline has already run, say so immediately, document the late discovery, and seek advice urgently, because certain remedies survive a missed first step while others do not.<\/p>\n

Conclusion<\/h2>\n

A proposition de rectification<\/em> is a serious letter but also a structured opportunity. Answer within thirty days, extend the period if you need British documents, test the motivation of the notice against Article L. 57, and build an income-by-income treaty file proving that each disputed pound was included in your British taxable base so that the Article 24 credit must follow. If the administration maintains its position, contest the collection notice through the compulsory formal claim and then, within two months of rejection, before the administrative court, pleading defective reasoning and documented treaty rights together and challenging each penalty. Handled this way, many British files end with the proposal abandoned or substantially reduced, and the treaty of 2008 keeps doing exactly what it was written for: making sure the same income is not taxed twice.<\/p>\n

Need a quick opinion on your case.<\/h2>\n

If you have received a proposition de rectification<\/em> or a collection notice concerning your British income, our firm offers a telephone consultation within 48 hours with a lawyer of the firm to review your deadlines, your treaty position and your chances of discharge. Call +33 6 46 60 58 22<\/a> or write via our contact page<\/a> with a copy of the notice and your most recent French and British tax documents.<\/p>\n","protected":false},"excerpt":{"rendered":"

You have received a proposition de rectification for your British income. 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