A British citizen can be treated as tax resident in France even when they still file a UK Self Assessment return, keep a home in England, or spend fewer than 183 days in France. The first question is not where you feel settled. It is whether French domestic law treats you as having a French domicile fiscal (tax domicile), whether UK rules also treat you as resident, and then how the France–UK Double Taxation Convention allocates residence between the two countries. Brexit did not remove that convention.
This distinction matters when the French tax authority sends a proposed adjustment, taxes your worldwide income, refuses non-resident treatment, or applies the wrong treaty relief to a pension, investment, salary or capital gain. A successful response needs a dated factual record, evidence about both homes and both countries, and a procedural document that answers each reason given by the administration. This article explains the legal sequence, the evidence that normally carries weight, the current complaint deadlines, and the route to the administrative court. It deals with the individual taxpayer settling in France; it does not cover a French property purchase or the creation of a company.
I. How do French and UK rules identify your tax residence?
A. What does French law examine before the treaty?
The starting point is the French General Tax Code, known as the Code général des impôts or CGI. Article 4 A of the CGI draws the fundamental line: « Les personnes qui ont en France leur domicile fiscal sont passibles de l’impôt sur le revenu en raison de l’ensemble de leurs revenus ». In practical terms, a person who is French tax resident can be assessed on French and foreign income, subject to the applicable treaty. A person whose tax domicile is outside France is generally assessed only on French-source income, again subject to treaty rules.
Article 4 B of the CGI then identifies the domestic tests. It covers a person who has in France their home or principal place of stay — « Les personnes qui ont en France leur foyer ou le lieu de leur séjour principal » — a person who carries on their main professional activity in France, or a person whose centre of economic interests is in France. The current text also states that a person satisfying one of those tests may nevertheless not be treated as French resident when an international tax treaty assigns residence to the other country. The domestic analysis and the treaty analysis are therefore connected, but they are not interchangeable.
The 183-day rule is not a complete answer. France uses the idea of a principal stay, and public guidance often uses 183 days as a practical illustration. Article 4 B does not create a universal safe harbour under which every British person below 183 days is automatically non-resident. A permanent family home, a main professional activity or the centre of economic interests may decide the domestic question before day-counting becomes decisive. Conversely, a person can spend substantial time in France without having a French tax domicile if the actual facts show a temporary stay and a stronger home and personal life elsewhere. The facts must be assembled rather than reduced to one number.
Home and family. In French tax law, the foyer is the place where you normally live and where the centre of your personal life is located. It is not simply the address printed on a residence permit, nor is it necessarily the house that you own. A rented flat, a family home made available to you, or a furnished home used as your normal base may be relevant. A spouse or civil partner and children may be important evidence, but the administration must still examine the circumstances of the individual taxpayer. A British spouse living in England does not automatically make the other spouse non-resident in France.
The approach is illustrated by the Conseil d’État decision of 31 March 2014, no. 357019. In a case concerning the France–Switzerland treaty and French domestic residence, the court stated that « le foyer d’un contribuable célibataire s’entend du lieu où il habite normalement et a le centre de sa vie personnelle ». The court accepted evidence such as electricity and telephone expenditure, family members living in France, vehicles maintained there and French bank accounts. The point for a British taxpayer is not that the same outcome is inevitable. The point is that ordinary life evidence can outweigh an asserted intention to live abroad.
Work. A UK employment contract does not settle the French question. A British employee may remain employed and paid by a UK employer while carrying out the main work from France. The place where duties are physically performed, the time spent in each country, the employer’s instructions, the location of clients and the business purpose of travel may all matter. The article on working remotely from France for a UK employer addresses the related payroll and social-security issues; those issues should not be confused with the separate residence question.
Economic interests. The French authority may look at the location and scale of income-producing assets, the place from which investments are managed, business interests, bank accounts, rental activity and the source of the income that supports the household. Owning a French holiday home is not the same as having the centre of economic interests in France. A British pension paid into a UK account is not, by itself, proof that the UK remains the treaty residence. Evidence must explain how assets, work and personal expenditure fit together in the relevant tax year.
The domestic sequence was stated clearly by the Cour administrative d’appel de Marseille decision of 18 December 2012, no. 10MA00166: « la situation fiscale d’une personne doit en premier lieu être examinée au regard du droit interne ». The court then explained that the convention becomes relevant when the person is resident of both states under their respective domestic laws. This is why a response that cites the treaty without first answering the French domestic criteria can miss the structure of the assessment.
French and UK tax years do not line up. French personal income tax is assessed by calendar year. The UK tax year normally runs from 6 April to 5 April. The UK government explains that UK residence normally depends on automatic tests and the sufficient ties test, including days, work, family and accommodation. Its guidance on UK residence and tax states that UK residents normally pay UK tax on UK and foreign income, while non-residents generally pay UK tax on UK income. The current Statutory Residence Test guidance also confirms that residence is tested year by year and that split-year treatment has its own conditions.
That UK result is important evidence, but it is not a French ruling. A British citizen can be UK resident under the Statutory Residence Test and also French-domiciled under Article 4 B. They may then be resident in both states for treaty purposes, requiring the tie-breaker in Article 4 of the convention. The reverse is also possible. A British tax return, a National Insurance record, a council-tax bill or a UK residence certificate should be included in the evidence bundle, but each document needs to be connected to the relevant year and explained.
B. How does the France–UK treaty resolve dual residence?
The applicable instrument is the convention signed in London on 19 June 2008 and published in France by the Decree of 7 January 2010. The UK also publishes the 2008 UK–France Double Taxation Convention in force. Article 4 first defines a resident by reference to domestic liability to tax. It then provides the tie-breaker for an individual treated as resident in both states.
The order is important. The individual is treated as resident only in the state where they have a permanent home available to them. If there is a permanent home in both countries, the analysis moves to the state with the closer personal and economic relations, called the centre of vital interests. If that cannot be determined, or there is no permanent home in either state, the habitual abode is examined. If habitual abode exists in both or neither state, nationality is considered. A person with both nationalities, or neither, may need the competent authorities to settle the matter by mutual agreement. Article 4 therefore does not say “count 183 days and stop”.
The treaty language is precise: « si elle dispose d’un foyer d’habitation permanent dans les deux Etats, elle est considérée comme un résident seulement de l’Etat avec lequel ses liens personnels et économiques sont les plus étroits ». In English, a home in both countries does not automatically make France the residence, and it does not automatically preserve the UK residence. The taxpayer must show which country has the closer overall connection at the legally relevant date.
Permanent home available to you. Availability is factual. Ownership is relevant, but so are a long lease, unrestricted access, furnished accommodation, the ability to keep personal belongings there and the way the property is actually used. A French property rented to an unrelated tenant for the whole period may be less persuasive as a home available to the owner. A Paris flat held through a company, kept furnished and used whenever the taxpayer returns to France may still be examined closely. The question is not simply “where did I sleep most?” It is “what permanent homes were available, and which facts show that they were genuinely available as homes?”
Centre of vital interests. This is not a bank-balance contest. Personal relations may include the partner’s ordinary home, children’s schooling, caring responsibilities, medical arrangements, social life and the location of the household’s regular spending. Economic relations may include employment, business management, investment decisions, pensions, rental income and the place where the taxpayer’s financial affairs are organised. A retired British person may have little employment evidence but substantial family, healthcare and asset-management evidence. A remote worker may have a UK employer but perform the core work from a French home. The facts must be considered together.
The Conseil d’État decision of 26 April 2017, no. 384872, although it concerned the France–Switzerland convention, explains the method. The court held that « La notion de foyer d’habitation permanent mentionné à cet article doit être définie en fonction d’éléments d’appréciation relatifs à la personne du contribuable ». It upheld an analysis that considered residences, bank accounts, a French company, property management and pension or investment income before moving to the habitual-stay criterion. The practical lesson is that a treaty file must be personal and evidenced, not built around a single address.
Recent UK-related guidance from the French courts. A particularly useful recent decision is the Cour administrative d’appel de Paris judgment of 18 June 2026, no. 23PA05246. The dispute concerned a taxpayer who argued that he had moved his domicile to London and that a Paris property was a secondary residence. The judgment examined the French home, the London home, the taxpayer’s personal life, professional activity and the location of productive assets. It records the treaty analysis under Article 4 and ultimately held that the evidence did not establish the claimed UK economic position for the relevant period. The judgment includes the short finding that the documents produced « ne permettent toutefois pas de quantifier le temps » devoted to the UK professional activity.
That case is not a general rule that a Paris property defeats a move to London. It is a warning about proof and dates. The taxpayer had to show what happened between the claimed transfer date and the date of the transaction. A future British claimant should therefore build the file month by month: the date the French home became secondary, the date the UK home became available, the date the household moved, the days actually worked in each state, and the date assets or management functions changed. A later UK move cannot retroactively prove that the French position had already ended earlier.
The same caution applies to nationality. Under the treaty, nationality is a late tie-breaker. A British passport does not override a French home, French family life or a French economic centre. Conversely, keeping a French passport, a French bank account or a French property does not by itself prove French treaty residence. These are facts to be weighed in sequence, not shortcuts.
Finally, the convention may allocate taxing rights for particular income even when the residence conclusion is clear. A French resident may still have UK-source income, and a UK resident may still have French-source income. The treaty articles on employment, pensions, immovable property, interest, dividends and gains must be checked separately. The existing article on UK pensions in France after Brexit deals with pension classification and declaration. Residence is the gateway question; it is not the only question.
II. How do you challenge the assessment and protect your position?
A. What evidence and observations should you submit?
Start by identifying the document and its legal effect. A request for information is not the same as a proposition de rectification (proposed tax adjustment). A proposed adjustment is not the same as the final tax notice. A rejection of a complaint is not the same as an assessment. The response route, the date and the evidence needed depend on the document. Keep the original envelope, secure-message timestamp, portal download and every attachment.
If the administration has issued a proposed adjustment, the response should be headed as formal observations and should answer the reasoning paragraph by paragraph. Article L57 of the Livre des procédures fiscales (the French Tax Procedure Book, or LPF) requires the proposal to be motivated so that the taxpayer can respond. Its wording says that the proposal « doit être motivée de manière à lui permettre de formuler ses observations ». If the proposal does not identify the dates, home, professional activity or economic facts relied upon, ask the service to identify them. Do not assume that a vague assertion must be accepted.
Read the date carefully. In the ordinary contradictory procedure, the proposal normally gives a response period of 30 days, with a possible 30-day extension when requested in time and available under the applicable procedure. The exact notice controls, particularly if the case involves a special procedure. A request for an extension should be sent before the initial period ends. It should not replace a protective response. If the deadline is approaching, send a clear objection to the residence conclusion and state that supporting documents will follow, then supplement through the official channel.
Use a four-column chronology:
- Date or period: for example, the date the UK home became available, the date of the move, or the date a French lease began or ended.
- Country: France, England, Wales, Scotland or Northern Ireland, with the exact address where relevant.
- Fact: where you slept, worked, received mail, kept the household, attended appointments or managed assets.
- Document: the exhibit that proves the fact, its issuer, date and the part of the document relied upon.
Then divide the exhibits by the legal test rather than sending a box of unindexed papers. A useful file includes:
- Presence evidence: travel records, passport stamps where available, flight and train records, toll records, mobile-phone location data used cautiously, calendar entries and a day-count schedule for the relevant French calendar year and UK tax year.
- Home evidence: French and UK leases or title records, completion or sale documents, insurance, utility consumption, council-tax material, security arrangements, furniture movements, periods when a property was let, and proof of who could use it.
- Personal-life evidence: partner and children’s ordinary residence, school or university records, medical and insurance arrangements, clubs, recurring bills, caring responsibilities and the place where household decisions were made.
- Work evidence: employment contract, employer confirmation, work calendar, location policy, payslips, travel schedule, client meetings, board minutes, invoices and evidence of the time actually worked in each country.
- Economic evidence: bank statements, investment-management mandates, pension statements, rental agreements, business accounts, dividend records and evidence showing where assets were managed and where income arose.
- UK evidence: the completed Statutory Residence Test analysis, Self Assessment return, HMRC correspondence, a certificate of residence where available, National Insurance record and the explanation of any split-year treatment.
Do not send every document without a narrative. A bank statement may show a French card transaction, but it does not explain whether the transaction was a short visit or ordinary living. A UK utility bill may show an address, but it does not establish that the home was available to the whole household throughout the relevant period. Each exhibit should have a short description: what it proves, which date it covers and which French or treaty criterion it supports.
Answer each French criterion separately. If the administration says your foyer was in France, explain where the household normally lived and why. If it relies on principal stay, provide a reconciled day-count rather than an estimate. If it relies on work, distinguish time physically worked in France from income generated by a UK employer. If it relies on economic interests, explain the assets, income and management functions in both countries. A response that answers only the 183-day point leaves the other criteria untouched.
Then answer the treaty. State whether you accept that French and UK domestic rules both treat you as resident. If so, apply Article 4 in order. Identify the permanent home available in each state, then compare personal and economic relations. If the centre of vital interests cannot be determined, explain habitual abode. If the matter reaches nationality or competent-authority agreement, say so expressly. If you contend that French domestic law does not apply at all, make that argument first and keep the treaty argument in the alternative. This preserves the distinction between the two analyses.
The wording should be factual and dated. Avoid a broad statement such as “I moved to the UK in spirit” or “I have always been British”. Use “On 14 May 2025, the family moved to the London address; the French flat was let from 1 June 2025; the employment records show 18 workdays in France between June and September; the children attended school in London from September.” The administration and the court need a traceable record, not a conclusion.
If the assessment concerns a mixed couple, explain each person separately. French tax guidance on residents of France notes that residence can be determined for each member of the household. One spouse can be French resident and the other non-resident under the relevant convention, with different reporting consequences. Do not assume that a joint bank account or joint return decides the treaty residence of both individuals.
Ask the French service to correct the practical consequences that flow from the residence error. Depending on the facts, that may include removal of foreign income from the French taxable base, application of the treaty credit method, correction of the withholding rate, removal of an inappropriate surcharge, or transfer of the file to the non-resident service. Make the requested result measurable: identify the tax year, return line, notice number, income category and amount affected. A residence argument that never states the requested correction is harder to process.
B. What are the complaint, court and double-tax deadlines?
Once the administration has answered the observations or issued the tax notice, the next stage may be a réclamation contentieuse, meaning a formal tax complaint seeking correction, discharge or repayment. Article L190 of the LPF defines the contentious route for errors in the assessment or calculation and for the benefit of a right arising from legislation or regulation. It provides that complaints can be made after the response to the taxpayer’s observations under Article L57. The text begins: « Les réclamations relatives aux impôts, contributions, droits, taxes, redevances, soultes et pénalités de toute nature » and treats those claims as contentious claims when they seek correction of an error or recognition of a legal right.
For income tax and related direct taxes, the current deadline must be calculated from the applicable event. Article R*196-1 of the LPF, in the version in force from 30 July 2026, states that a complaint must normally be filed « au plus tard le 31 décembre de la deuxième année suivant celle » of the tax collection notice, payment or event that gives rise to the claim. The precise paragraph and any special rule must be checked against the notice. Do not rely on a generic internet deadline, especially where the tax is a local tax, a withholding tax or a payment without a tax assessment.
A complaint should identify the taxpayer, tax number, tax year, notice or collection reference, the amount challenged, the legal basis and the requested relief. Attach the proposed adjustment, assessment, observations, response from the service, treaty residence evidence, UK material and a calculation of the corrected tax. Send it through the secure tax portal or by a method that creates proof of delivery. Retain the complete submission and the confirmation receipt.
Article L190 also explains that the complaint process can be used for a claim based on a legal rule contrary to a higher rule and that the complaint rules govern the time limit. The purpose is not to create a second informal discussion after the deadline. It is to place the dispute in the statutory administrative route. A late complaint can fail even where the residence argument is strong.
If the administration rejects the complaint or grants only part of the relief, Article L199 of the LPF provides that an unsatisfactory decision on a complaint concerning direct taxes may be brought before the administrative court. The court will not simply ask where you intended to live. It will examine the evidence, the reasons given by the administration, the treaty sequence and the tax calculation. The original exhibits and the chronology prepared at the first stage therefore remain central.
The assessment procedure itself has safeguards. Article L48 of the LPF requires the administration, after an examination of personal tax circumstances or another relevant audit, to indicate the amount of duties, taxes and penalties resulting from proposed adjustments before the taxpayer responds. This allows the taxpayer to measure the dispute. A proposal that gives no reliable calculation, no clear year or no explanation of the residence assumptions should be challenged procedurally as well as substantively.
The courts have treated evidence and procedure as connected. In Conseil d’État no. 384872, the court accepted that the administration and the lower court had followed the order of treaty criteria and considered the evidence filed. In Conseil d’État no. 357019, the factual record included family, household costs, vehicles and bank accounts. In CAA Marseille no. 10MA00166, the court distinguished the domestic test from the treaty tie-breaker. In CAA Paris no. 23PA05246, the taxpayer’s asserted London transfer was tested against the actual French and UK homes, work and finances. These are four distinct references with exact decision numbers, and they point to the same practical requirement: prove the facts that make the legal sequence work.
Do not confuse a French complaint with the mutual agreement procedure. The treaty also contains a competent-authority mechanism, usually called the mutual agreement procedure or MAP, for a person who considers that the actions of France or the UK result in taxation contrary to the convention. It is a state-to-state procedure and does not replace a French complaint deadline. If a French assessment and a UK assessment create double taxation, protect the French domestic appeal route while considering the HMRC route under the treaty. The GOV.UK guidance on being taxed twice explains that a double-taxation agreement may provide relief or a refund and that the relevant treaty must be checked for the category of income.
The treaty’s Article 24 deals with elimination of double taxation. The UK text explains that French tax payable under the convention may be allowed as a credit against UK tax on the same income, subject to the treaty conditions. The French method can also use a credit or an effective-rate mechanism depending on the income and treaty article. A credit is not proof that the UK is the sole treaty residence, and it is not a substitute for correcting a wrong French residence assessment. It is a mechanism applied after the taxing rights have been identified.
Keep the two administrations consistent. If the UK return says that you ceased UK residence on a particular date, explain the date in the French response. If the UK return uses split-year treatment, show the relevant case and the conditions relied upon. If HMRC has not issued a formal certificate, do not invent one; provide the documents that exist and explain what has been requested. If France and the UK use different tax years, state which French calendar year and which UK tax year each exhibit covers.
A British resident in France should also separate three questions that are often mixed together: where the person is resident under French domestic law; where the person is resident under the France–UK treaty; and where a specific item of income may be taxed. The first question is answered by the CGI and facts. The second is answered by Article 4 and the tie-breaker. The third is answered by the income article and, where relevant, Article 24 relief. A response that jumps directly to pension, rental or employment relief without resolving the residence framework can leave the core assessment in place.
When a deadline is close, the safest operational sequence is short and disciplined: preserve the notice and delivery date; calculate the response deadline; file observations that clearly dispute the residence conclusion; request the extension if the procedure permits it; build the chronology; attach the strongest evidence first; submit the complaint before the statutory cut-off; and obtain a written confirmation. The legal merits can be developed in a supplemental memorandum, but a missed procedural date is much harder to repair than an incomplete first explanation.
Conclusion
For a British citizen who lives between France and the UK, a French tax residence assessment is won or lost on the legal sequence and the evidence. French domestic law first asks about the home, principal stay, professional activity and economic interests. If UK law also treats you as resident, Article 4 of the 2008 France–UK convention applies a tie-breaker: permanent home, centre of vital interests, habitual abode, then nationality or competent-authority agreement. There is no universal 183-day answer.
Respond to the document you actually received, not to a general idea of expatriation. Use a dated chronology, label every exhibit, answer each criterion, separate domestic residence from treaty residence, and protect the complaint deadline under the LPF. If double taxation remains, consider the UK and French procedures in parallel. The objective is a reasoned correction of the tax year and income affected, supported by documents that show where your life and financial activity were actually organised.
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