Moving from the United Kingdom to France after Brexit creates two separate legal questions that are often mixed together. The first is immigration: whether you may enter, remain and work in France. The second is tax residence: which country may treat you as resident, on what date, and what you must declare. A residence permit, a French address or a stay of 183 days can be important evidence, but none of those facts alone provides a complete answer in every case.
For a British citizen who has recently settled in France, the practical risk is usually not a lack of information. It is an inconsistent file: one answer sent to HM Revenue & Customs (HMRC), another position taken in France, a UK tax year measured from 6 April while the French return follows the calendar year, and foreign income or bank accounts omitted because tax was already paid in the United Kingdom. The France–United Kingdom tax treaty can resolve a dual-residence situation, but it does not remove the need to establish the facts and file the correct forms.
This article explains how to identify French tax residence, how the treaty tie-breaker works, which evidence should be kept, how the first French return is assembled, and what to do if the French and UK authorities do not reach the same conclusion. It focuses on the individual moving to France, not on the purchase of French property or the creation of a company.
I. How is French tax residence determined after moving from the UK?
A. Does living in France for 183 days automatically make a British citizen French tax resident?
The short answer is no: 183 days is a useful warning threshold, not a universal rule that replaces the French statutory criteria. Under Article 4 A of the French Tax Code (Code général des impôts), a person whose tax domicile is in France is liable to French income tax on all income, whereas a person whose tax domicile is outside France is generally liable only on French-source income. The starting point is therefore the location of the tax domicile, not the nationality shown on the passport.
Article 4 B of the French Tax Code sets out three principal connecting factors. A person is treated as having a French tax domicile where France is the person’s home or principal place of stay, where the person carries on a professional activity in France unless it is only ancillary, or where France is the centre of the person’s economic interests. A single factor may be enough under French domestic law. The wording of the first limb is important: Les personnes qui ont en France leur foyer ou le lieu de leur séjour principal
means people whose home or principal place of stay is in France.
The French word foyer does not simply mean the address written on a utility bill. In tax law, it usually refers to the place where the individual normally lives and where the family’s personal life is centred. A spouse, civil partner or children who remain in France can therefore be decisive even if the taxpayer travels regularly to the United Kingdom. If the person is single and has no children, the analysis focuses more directly on where the person normally lives. A temporary stay in London for work, family reasons or an exceptional event does not necessarily displace a French home.
The principal-stay test is separate. Service Public explains the 183-day reference as the situation in which France is the country where the person stays for at least 183 days during the year, but the calculation is not a permission to disregard the other tests. A person may become French tax resident before reaching 183 days if France has become the person’s normal home, professional base or economic centre. Conversely, counting days alone can be misleading where the person’s family home and main economic life remain elsewhere and the France–UK treaty allocates residence to the United Kingdom.
The Conseil d’État has repeatedly required the factual situation to be examined rather than reduced to a slogan. In Conseil d’État, 3 November 1995, no. 126513, the court stated that, for Article 4 B, the home is the place where the taxpayer normally lives and has the centre of family interests, and that principal stay matters where there is no home. The decision uses the phrase le foyer s’entend du lieu où le contribuable habite normalement
. For a British mover, that means the date on which the French home became the normal home deserves a written explanation supported by documents.
Professional and economic links can produce a French residence even where the living arrangements appear divided. A person who works from France for a UK employer, runs a freelance activity from France, manages investments from France or receives most economic resources through France should not assume that a UK payroll or UK bank account settles the question. Article 4 B asks where the activity is actually exercised and where the economic interests are centred. The precise answer depends on the facts, the employment contract, the location of the work, the management of the business and the treaty analysis.
For example, a British consultant may spend 140 nights in France, 120 nights in the United Kingdom and the remainder elsewhere. If the consultant’s spouse and children live in France, the French home is available throughout the year, the work is performed mainly from France and the UK flat is retained for short visits, France may be the domestic tax residence even though the 183-day figure is not reached. A different result may follow for a person who keeps the family home, full-time employment and ordinary life in England and visits a French holiday home for several weeks.
Immigration status is relevant but not conclusive. A post-Brexit residence document may prove that the person was authorised to live in France. It does not by itself decide whether the person’s tax domicile moved on the date of issue, on the date the family moved, on the date work began in France or on another date established by the evidence. Equally, a person may be French tax resident while an immigration application is pending if the domestic tax criteria are met. The two files should be kept consistent, but they answer different questions.
The first practical exercise is to prepare a calendar for the whole year of arrival. Record every overnight stay, the availability of each home, the location of the spouse and children, the place where work was actually done, the dates on which French utilities and insurance began, the end of the UK tenancy or sale, and the date on which the move became permanent. The purpose is not to manufacture a favourable answer. It is to identify the legally significant date before a form, certificate or tax return fixes an unexplained position.
B. What happens if France and the UK both regard you as tax resident?
Dual domestic residence is possible. France applies the Article 4 A and 4 B tests described above. The United Kingdom applies the Statutory Residence Test (SRT), which is HMRC’s framework for deciding UK residence by reference to automatic UK tests, automatic overseas tests and sufficient ties. The GOV.UK guidance on UK residence and tax explains that UK residence usually depends on days spent in the UK tax year, which runs from 6 April to 5 April, together with the applicable home, work, family and other ties. It also explains that the year may be split when a person moves in or out of the UK, subject to the statutory conditions.
The UK domestic result and the French domestic result are not necessarily the final result for treaty purposes. The Convention between France and the United Kingdom signed at London on 19 June 2008 and published by Decree no. 2010-20 contains the residence tie-breaker in Article 4. It first asks where the individual has a permanent home. If there is a permanent home in both countries, it asks where the individual’s personal and economic relations are closer, described in the treaty as the centre of vital interests. If that cannot be determined, it considers habitual abode, then nationality, and finally an agreement between the competent authorities.
The treaty language should be read carefully. Article 4 does not say that the country issuing the residence card wins, that the country receiving pension payments wins, or that nationality automatically controls. Nationality is only a later step in the sequence. Brexit did not abolish the bilateral income-tax convention. It changed the wider legal environment for British nationals in France, but the treaty remains the instrument used to address overlapping income-tax residence where its conditions apply.
The permanent-home question is factual. A furnished French home available for the taxpayer’s continuous use and a retained UK home may both qualify. That does not end the analysis. The next question is where personal and economic relations are closer. Evidence may include the location of the spouse and children, the regular family routine, employment, directorships, business management, the place of substantial investments, social and professional activity, and the point from which the person’s ordinary life is organised. No single bank statement should be treated as a substitute for the full picture.
The Conseil d’État’s case law shows why the evidence must be assembled rather than asserted. In Conseil d’État, 26 April 2017, no. 384872, the court examined the permanent-home and personal-connection analysis in a treaty residence dispute and stressed that the permanent home is assessed through facts relating to the taxpayer. Although that case concerned France and Switzerland, the method is relevant to the same treaty structure used in the France–UK convention. It is safer to explain why the facts point to one country than to rely on a generic statement that the person “split time” between two countries.
The French domestic residence analysis also gives useful guidance on proof. In Conseil d’État, 27 June 2018, no. 408609, the court described the home of a single taxpayer as the place where the taxpayer normally lives and has the centre of personal life. In Conseil d’État, 9 June 2021, no. 431551, the court again treated the normal home and family-centre analysis as a matter of evidence, rather than accepting a bare assertion about living abroad. These are not decisions about British nationals specifically, but they are official illustrations of the evidential approach to Article 4 B.
Build a treaty file with four layers. First, keep the day count for both countries, using travel records, boarding passes, calendars and accommodation evidence. Second, identify every permanent home and the dates on which it was available. Third, explain personal and economic connections: family, work, business management, accounts, investments and regular activities. Fourth, record the position taken in each country, including any HMRC correspondence, French tax residence certificate, tax notices, return positions and requests for clarification. The file should explain the conclusion in chronological order.
A tax residence certificate can support a treaty claim, but it is not a universal substitute for the underlying evidence. If HMRC asks for a certificate of residence, the request should match the UK tax year and the treaty article being relied on. If the French administration asks why the UK return treats the taxpayer as resident or why a UK income is included in France, answer with the same facts and identify the treaty mechanism. A certificate issued for one purpose or one period should not be silently reused for a different period.
The most common error is to present the French return as though the taxpayer had ceased all UK connections on the day the French address was opened. The second is to tell HMRC that the person remains fully UK resident while telling France that the same permanent home and centre of life moved to France, without explaining whether the treaty tie-breaker changes the result. A dual-residence year can be legitimate, but it requires a clear domestic analysis in each country and a separate treaty conclusion.
II. How should a British newcomer file and protect the first French tax return?
A. Which forms and foreign income must be reported on the first return?
Once France is the applicable tax residence, the first return should be prepared as a complete residence file, not as a declaration limited to French bank payments. Article 170 of the French Tax Code requires a person liable to income tax to submit a detailed declaration of income, benefits, family circumstances and other elements needed to calculate the tax. The current version of the Code should be checked for the year being filed; the principle remains that the return is the vehicle through which the taxable situation is disclosed.
The principal form is form 2042, the French income-tax return. The official 2042 page on impots.gouv.fr explains that it declares the income received by members of the French tax household. A person making a first declaration in France should follow the current instructions from the relevant Service des impôts des particuliers (SIP, personal tax office). The DGFiP first-declaration guidance explains how a person without an existing tax number can have identity details verified and obtain access credentials. For the 2026 process, the international-tax guidance also states that a person declaring income or wealth in France for the first time may have to use a paper return. That operational rule should be checked for the year actually being filed, because the administration updates forms and procedures.
Foreign income is normally dealt with through form 2047, the declaration of foreign income received by a taxpayer domiciled in France. The official form 2047 page states that the form must be filed where a person domiciled in France has received income outside metropolitan France and the overseas departments, and that it is attached to the general income declaration. The DGFiP guidance on foreign-source income explains that the convention with the country of source must be checked first, and that a credit or exemption mechanism may prevent double taxation.
For a British taxpayer, the potential categories commonly include UK employment income earned before and after the move, self-employment or consultancy income, UK rental income, dividends, interest, pensions and gains. The correct French treatment depends on the category, the date, where the activity occurred, and the France–UK convention. The fact that an amount was paid into a UK account does not make it invisible to France. Nor does the fact that UK tax was withheld prove that the UK has exclusive taxing rights. The amount, currency conversion method, foreign tax paid and treaty relief must be reconciled in the relevant return lines.
Do not confuse income reporting with tax allocation. A treaty may give the United Kingdom the primary right to tax a category, or may require France to give an exemption or credit, but the income may still need to be disclosed in France for the effective-rate calculation or to establish the household’s total position. The French tax authority’s guidance expressly directs taxpayers to the applicable convention and the 2047 instructions. A return that omits an amount because “tax was already paid in Britain” can therefore be incomplete even where no additional French tax is ultimately due on that amount.
Foreign accounts require a separate check. Article 1649 A of the French Tax Code provides that individuals domiciled in France must declare the references of accounts opened, held, used or closed abroad at the same time as the income return. A UK current account, savings account, investment account or other financial account should be reviewed against the form 3916 or applicable annex instructions. The question is not whether the account earned interest. It is whether the account falls within the statutory reporting obligation for the year. Keep the account-opening, closing and annual statements so that the answer can be checked.
The penalty provisions make this a point for active verification. Article 1736 of the French Tax Code provides an administrative fine for failures relating to foreign-account declarations, with the applicable amount depending on the account and country circumstances. The existence of an automatic exchange of financial information between the UK and France is not a reason to wait for a reminder. It is a reason to make the filing accurate before the information received by the administration is compared with the return.
Prepare the first return in this order:
- Fix the relevant residence period and explain any arrival-year transition in a dated note.
- List every income category received during the French tax year, including UK amounts, gross amounts and foreign tax withheld.
- Map each category to form 2042, form 2047, form 2042-C PRO or another annex only after checking the applicable treaty article.
- Review UK accounts and investments for the foreign-account reporting form, including accounts opened, used or closed during the year.
- Keep the UK Self Assessment computation, P60 or payslips, pension statements, bank statements, exchange-rate calculation and proof of foreign tax paid.
- Submit the return through the route available for a first-time filer and keep proof of delivery, the submitted forms and the administration’s response.
The UK side must be prepared on its own timetable. HMRC’s official foreign-income and residence guidance explains that UK residence determines whether foreign income is normally within the UK charge and that relief may be available where income is taxed in more than one country. The UK tax year runs from 6 April to 5 April, while France works by calendar year. A move in September can therefore produce one French calendar-year analysis and a different UK split-year analysis. The dates should be reconciled in a table rather than forced into one country’s calendar.
The same discipline is needed for a UK pension or UK rental property. Those subjects may have their own treaty provisions and forms, but they still depend first on the residence facts and the year in which the income arose. A pension article cannot cure an incorrect residence date. A property-income calculation cannot decide where the taxpayer’s home was. The residence file should therefore be completed before the income categories are allocated.
B. What should you do if the residence position is disputed, the return was late, or tax was charged twice?
If the French administration treats you as resident when you say you remained resident in the UK, start by separating three issues: the French domestic test, the UK domestic test and the treaty result. A response that jumps straight to “I paid tax in the UK” does not answer whether Article 4 B made France the domestic residence or whether Article 4 of the treaty allocated treaty residence to one country. The response should attach the calendar, home evidence, family and work evidence, and the return positions already taken.
If the first return was incomplete, voluntary correction is normally safer than waiting for an automatic exchange or an audit. Ask the SIP how the correction should be filed, identify the omitted income or account, state the relevant facts and pay or arrange the resulting amount if appropriate. Do not rewrite the underlying residence story without explaining what changed. If a date was genuinely misunderstood, provide the evidence that shows why the original position was mistaken and why the corrected position is coherent with the UK filings.
Late filing has financial consequences. Article 1728 of the French Tax Code provides for a 10% increase in the absence of a formal notice or where the return is filed within the statutory period after a notice, with higher increases in the circumstances specified by the provision. The precise rate depends on the procedural history and the type of omission. Article 1727 of the Code also provides for late-payment interest, currently stated in the text at 0.20% per month, subject to the conditions and exceptions in the article. A first-time British filer should not assume that being new to the French system automatically cancels these rules; the better course is to regularise quickly and explain good faith with documents.
Where both countries tax the same income, the France–UK convention must be applied category by category. The treaty may allocate taxing rights to one country and require the other to provide relief. The French official guidance describes the use of the applicable convention and the 2047 form; HMRC likewise provides guidance on foreign income and relief. Keep evidence of tax paid, tax withheld, refunds, assessments and exchange rates. A credit calculation that is not supported by the foreign assessment can delay or weaken the claim.
The treaty also contains a mutual-agreement route. Article 26 of the published France–UK convention states that a resident who considers that measures taken by one or both states result, or will result, in taxation not in accordance with the convention may submit the case to the competent authority, independently of domestic remedies. The article sets time limits, including three years from the first notification of the measure that produces the non-conforming taxation, or six years from the end of the relevant fiscal year or period in the circumstances described in the text. The mutual-agreement procedure is not a reason to let a French objection or UK appeal deadline expire. Protect domestic rights while the treaty issue is assessed.
The formal treaty process is especially important where the two administrations classify the same permanent home differently. The file should state the requested treaty outcome, identify the exact income and years, list the domestic notices, and explain how the permanent-home, centre-of-vital-interests, habitual-abode and nationality tests lead to the proposed answer. Avoid making the argument depend on one phrase such as “I am British” or “I have a French residence card”. The treaty sequence is more demanding than that.
An evidence pack for a residence dispute should include:
- a day-by-day travel schedule for France, the UK and third countries;
- proof of when each home was available, occupied, rented, sold or placed at the taxpayer’s disposal;
- the household timeline, including the location of a spouse, civil partner and children;
- employment contracts, payroll records, work-location evidence and business-management documents;
- French and UK tax returns, notices, certificates of residence and correspondence with both administrations;
- bank, utility, insurance, healthcare, school and transport evidence used to explain the ordinary centre of life;
- foreign-income schedules, account declarations, pension statements, rental statements and proof of tax paid; and
- a short chronology explaining the move, the residence date chosen and any later change in circumstances.
The courts’ approach is a useful warning against selecting only favourable documents. In Conseil d’État, 18 July 2018, no. 409035, a dispute involving a person connected with Jersey required the court to consider the relationship between the taxpayer’s circumstances, the household and Article 4 B. In Conseil d’État, 18 September 2023, no. 469789, the court examined professional functions and the centre of economic interests in applying the French residence criteria. These decisions do not turn every British move into a precedent. They show why a complete factual record matters when an administration challenges the label used on a return.
If a French tax notice has already been issued, check the notice date and the applicable claim period immediately. A treaty mutual-agreement application, a French administrative claim and a judicial appeal are not interchangeable documents. The correct route depends on the notice, the year, the disputed income and the relief sought. Preserve the original deadlines even if discussions with the SIP or HMRC are continuing.
Finally, avoid using “non-resident” as a general description of a lifestyle. It is a legal conclusion for a particular tax, year and sometimes treaty. A British citizen can be resident in France for income tax while still having UK-source income taxed in the UK, can remain subject to UK filing obligations, and can have a French residence permit without every income item becoming taxable in France. The result comes from the domestic rules, the convention, the income category and the evidence taken together.
Conclusion
For a British citizen moving to France after Brexit, the decisive question is not simply how many days were spent in either country. It is where the normal home, family life, work and economic interests were located, when that situation changed, and how the France–UK treaty resolves any overlap. The first French tax return should then disclose the worldwide picture in the correct forms, including foreign income and reportable UK accounts, while the UK return is prepared on the different UK tax-year timetable.
The safest approach is to build one consistent evidence file before filing: travel dates, homes, household, work, income, tax paid, account details and correspondence. If the position is uncertain or a notice has already been received, obtain advice before making a statement that fixes the residence date or waives a domestic remedy. A coherent correction made early is easier to defend than two contradictory returns discovered through automatic information exchange.
Need a quick opinion on your case
You can arrange a telephone consultation within 48 hours with a lawyer from the firm to review your French tax residence, treaty position and first-return file.
Call +33 6 46 60 58 22 (Maître Reda Kohen), or use the firm’s contact form.