You sold the house in Kent or handed back the keys on a Manchester flat, took the ferry or the tunnel with the dog and twelve boxes, and signed a French lease in Lyon, Nantes or a stone cottage outside Sarlat. Your British salary keeps arriving for the handover months, a tenant still pays rent into your Barclays current account, interest trickles onto a savings account you have held for years, and HM Revenue and Customs goes on deducting tax at source as if nothing had changed. Then spring comes, and with it the first French déclaration des revenus (income tax return). The questions arrive in a flood. From which exact date did France start taxing your worldwide income. Which boxes on the 2042, the 2047 and the 3916 form catch your British pay, your rent and your bank accounts. Whether the lump sum, the bonus and the dividends you already paid British tax on will be taxed a second time in France. And what happens if you get any of it wrong, from a modest late-filing surcharge to an avis d’imposition (tax assessment notice) that taxes you on income that belongs to the other side of the Channel. This guide answers those questions in order. It explains how French tax residence starts for a British newcomer, how to build a correct first return, how the France-UK double tax treaty divides British income between the two countries, and how to correct a mistake or challenge an inflated bill through the procedures that protect you.
I. I Have Just Moved from the UK: Am I French Tax Resident and What Must My First Return Contain?
A. Are You French Tax Resident Already, and From Which Exact Arrival Date?
French tax residence decides everything that follows, because it decides whether France taxes your worldwide income or only your French-source income. The starting rule is short and sweeping. Article 4 A of the French Tax Code provides that “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 plain English, once France regards you as having your domicile fiscal (tax home) in France, your entire income from every country falls inside the French return, subject only to what the France-UK treaty then exempts or relieves. If your tax home stays outside France, France taxes only your French-source income. For a British family that has genuinely relocated, with the home, the school run and daily life in France, the worldwide basis almost always applies, and the real fight is about the starting date and the proof.
The domicile fiscal test itself sits in Article 4 B of the French Tax Code, and it is alternative, not cumulative. One single criterion is enough. The text catches “Les personnes qui ont en France leur foyer ou le lieu de leur séjour principal”, then those who carry on a professional activity in France unless it is merely ancillary, then those who have the centre of their economic interests in France. The first branch, the foyer (the place where you normally live and centre your personal life) or the main place of stay, does most of the work for newcomers. You can become French tax resident within weeks of arrival if your family home is now in France, even while you still spend working weeks in London, even while a UK house sale drags on, and even while your British employer still runs your payroll through PAYE. Keeping a UK address for post, keeping a UK GP or keeping the children in a British boarding school does not preserve UK-only taxation once the centre of your personal life has crossed the Channel.
The courts give the foyer a concrete, evidence-driven meaning that British newcomers should read carefully. In its judgment of 20 October 2023, CAA Paris, 5th chamber, No 22PA00816, the Paris administrative court of appeal recalled that “le foyer d’un contribuable célibataire, sans charge de famille, s’entend du lieu où il habite normalement et a le centre de sa vie personnelle, sans qu’il soit tenu compte des séjours effectués temporairement ailleurs en raison des nécessités de la profession ou de circonstances exceptionnelles.” The taxpayer in that case had spent 164 days in France against 201 in Israel, yet the court held his tax home was in France because his Paris flat showed continuous occupation, his mail arrived there, his domestic employee worked there all year, his partner and daughter lived near Paris in a house he made available, and his bank accounts funded his daily life in France. The lesson for a British arrival is direct. Day-counting alone never decides the case. The tax office, and if needed the judge, looks at where you actually live, where your family sleeps, where your post lands, where your domestic bills run, and where your everyday spending flows. A spreadsheet of Eurostar tickets will not beat a lived-in French home.
Fixing the exact arrival date matters because it marks the boundary of the worldwide basis and it anchors every form you file. In practice, write down the day your French home became available and your personal life moved into it, keep the lease or the acte de vente (notarial deed of purchase), the inventory of fixtures, the first electricity and internet bills, the school enrolment certificates, the removal invoice and the travel bookings, and enter that arrival date on the first return where the form asks for it. Income received before that date from purely British sources belongs to your pre-residence period, while income received afterwards falls into the French worldwide net with treaty relief doing the anti-double-tax work described below. Where couples arrive on different dates, each spouse can have a different starting point, so keep separate proof files. Where you kept working for a British employer after the move, keep the employment contract, the payslips showing UK deductions, and any letter about remote working, because those papers prove both the French professional-activity branch of Article 4 B and the UK-source character of the pay that the treaty must then process.
One further boundary point helps many British newcomers sleep better. Being liable in France does not automatically end your UK position the same day. The United Kingdom applies its own statutory residence test, with a split-year mechanism that can treat the year of departure as two periods, and HM Revenue and Customs may go on operating PAYE or withholding while your non-residence position is settled. That overlap is normal and it is exactly what the treaty tie-breaker exists to resolve, which is why you should never stop a British payroll or close British accounts before taking advice, and never assume that a P45 or a PAYE coding notice decides your French position. The French test looks at your real life in France under Article 4 B, the British test looks at your real pattern under British statute, and where both claim you, the treaty chooses one residence for treaty purposes without erasing either domestic filing duty.
B. Which Forms, Boxes and Deadlines Make Up a Correct First 2042, 2047 and 3916?
The first French return is built from three layers, and British newcomers who understand the layers rarely go wrong. The base layer is the 2042, the main déclaration d’ensemble des revenus (overall income return). The legal spine is Article 170 of the French Tax Code, which states that “toute personne imposable audit impôt est tenue de souscrire et de faire parvenir à l’administration une déclaration détaillée de ses revenus et bénéfices, de ses charges de famille et des autres éléments nécessaires au calcul de l’impôt sur le revenu”. Every adult in the French tax household declares, and married couples and civil partners file jointly, because the same article adds that “Les époux doivent conjointement signer la déclaration d’ensemble des revenus de leur foyer.” For a British couple that married in England long ago, the French joint-household logic can surprise. One return covers both spouses, worldwide income is pooled into family parts, and the signature of both spouses matters, so organise the paperwork as a couple from day one rather than as two separate British taxpayers.
The second layer is the 2047, the return for foreign-source income, which works as a detailed schedule feeding the 2042. British pay kept on a UK payroll, rent from a letting in Leeds or Bristol, interest from a Barclays or HSBC savings account, and dividends from British shares each travel through the 2047 before their totals land in the 2042. The Code anticipates exactly this routing. Article 170, paragraph 2, dealing with foreign receipts, channels cross-border products into the return, and Article 120 of the French Tax Code confirms the breadth of the net by treating as income “Les dividendes, intérêts, arrérages et tous autres produits des actions de toute nature et des parts de fondateur des sociétés, compagnies ou entreprises financières, industrielles, commerciales, civiles et généralement quelconques dont le siège social est situé à l’étranger”. British dividends, British interest and similar distributions therefore enter the French base even when the company, the account and the currency are all British. The practical discipline is simple. List every British source on the 2047, convert sterling amounts at the proper annual rate, attach the treaty country, keep the P60, the P11D, the dividend vouchers, the letting accounts and the bank certificates for every line, and reconcile the totals with the 2042 so that the two forms tell the same story to the euro.
The third layer is the 3916, the declaration of foreign bank accounts, and it is the layer British newcomers most often miss. The obligation sits in Article 1649 A of the French Tax Code, which provides that “Les personnes physiques, les associations, les sociétés n’ayant pas la forme commerciale, domiciliées ou établies en France, sont tenues de déclarer, en même temps que leur déclaration de revenus ou de résultats, les références des comptes ouverts, détenus, utilisés ou clos à l’étranger.” Every British current account, savings account, cash ISA, stocks-and-shares ISA, premium-bond holding and business account that was open, used or closed at any point in the year must appear, including joint accounts and accounts you barely touch. A stocks-and-shares ISA keeps no French wrapper privilege. France taxes the dividends and gains inside it under the worldwide principle, and the account itself is declarable like any other foreign account. The same logic reaches PayPal-type e-money balances and crypto-platform fiat wallets where they function as accounts, so when in doubt, declare. The cost of an extra line on the 3916 is nil. The cost of an omitted account starts at a fixed fine and can trigger a full review of the income that flowed through it.
The price of forgetting the 3916 is fixed by statute and upheld by the courts, which is why this section deserves slow reading. Article 1736, IV of the French Tax Code states that “Les infractions au premier alinéa de l’article 1649 A sont passibles d’une amende de 1 500 € par ouverture ou clôture de compte non déclarée.” Per undeclared account opening or closure, the fine lands automatically once the omission is found, before any discussion of the tax itself. Taxpayers have challenged the flat 1,500 euro fine as disproportionate, and the administrative courts have rejected the challenge in clear terms. In its judgment of 19 September 2024, CAA Lyon, 2nd chamber, No 23LY02010, the Lyon court held that “L’amende forfaitaire de 1 500 euros susceptible d’être prononcée en cas de défaut de déclaration annuelle d’un compte bancaire ouvert, utilisé ou clos à l’étranger est propre à garantir la réalisation des objectifs poursuivis par le législateur”. The court explained that the penalty secures the tax office’s access to banking information and deters hidden foreign income, that its amount matches the seriousness of a pure reporting failure, and that neither automatic-exchange arrangements nor the theoretical possibility of requesting Swiss or other foreign records makes the flat fine disproportionate. For a British household arriving with two current accounts, two savings accounts and two ISAs, six missing 3916 lines can therefore mean 9,000 euros of fines on top of any tax, which turns an afternoon of paperwork into the highest-paid chore of the relocation.
Deadlines and filing channels complete the first-return picture. France taxes on a calendar-year basis with the return filed the following spring, usually May into early June with staggered dates by department and a later date for online filing, and online filing through the personal space on impots.gouv.fr is compulsory for most taxpayers with only narrow exceptions for the elderly, the digitally excluded and first-time filers without access. A British newcomer with no prior French tax number often starts on paper for the very first return or creates access through the tax office helpdesk, then moves online the next year. Diarise three consequences of missing the deadline. First, the return can be assessed by the office itself. Article L66 of the Tax Procedure Book warns that “Sont taxés d’office : 1° à l’impôt sur le revenu, les contribuables qui n’ont pas déposé dans le délai légal la déclaration d’ensemble de leurs revenus”. An official assessment built without your treaty claims, your charges and your family parts is almost always heavier than a self-filed return. Second, surcharges and late-payment interest accrue from the statutory date. Third, the paper trail for later challenges starts badly, because the office can answer that you never gave it the figures. File on time even when a British document is missing, using the best available figure flagged as provisional with the final voucher to follow, then correct through the proper rectification channel described below rather than by staying silent.
II. HMRC Still Deducts Tax and France Sends a Bill: How Do You Avoid Double Tax and Challenge Errors?
A. How Does the France-UK Treaty Split Salary, Pension, Rent and Dividends Without Double Tax?
Double taxation is the fear that dominates every British kitchen table in the first French year, and the answer sits in a single bilateral instrument. The France-UK double tax convention signed in London on 19 June 2008, published by Decree No 2010-20 of 7 January 2010, allocates taxing rights between the two states and then eliminates the remaining overlap by exemption or by credit. Its scope rule is generous. The convention covers persons who are residents of one or both contracting states, so a British newcomer with trailing UK ties and a fresh French home is exactly the person it was written for. The detailed French commentary on the convention, published by the tax administration in the BOFiP guidance on the France-UK convention, walks through each category of income in the same order as the treaty articles and remains the working manual of the French assessing officer who will process your 2047.
The hinge of the whole mechanism is treaty residence, because the treaty can only divide income once it knows which state counts as your residence for treaty purposes. Article 4, paragraph 1 of the convention starts from domestic law. It treats as a resident of a contracting state anyone who, under that state’s legislation, is liable to tax there by reason of domicile, residence, place of management or any similar criterion. Where both states claim you under their own rules, which is the normal position in the arrival year, paragraph 2 runs a cascade of tie-breaker tests. First, that person counts as resident only of the state where they keep a permanent home, and where there is a permanent home in both states, only of the state of their closest personal and economic ties. Only if that centre of vital interests cannot be pinned down does the treaty look at habitual presence, then nationality, then mutual agreement between the authorities. For most British relocations the cascade stops at the first or second step. The family house is now in France, the spouse and children live there, the newcomer works remotely from the French study or commutes back, and the centre of vital interests has plainly moved, so the treaty regards the newcomer as French-resident for treaty purposes while the United Kingdom keeps a limited right to tax the British-source items the treaty assigns to it.
With treaty residence settled, each income stream follows its own allocation, and British newcomers should learn the four patterns that cover nearly every first return. First, salary for work physically done in Britain during the handover period generally stays taxable in the United Kingdom, while salary for remote work done from the French home generally belongs to France, with each state then giving relief for tax properly levied by the other. Keep a day-by-day work diary, because the split follows physical presence far more than payroll location, and a London PAYE slip never moves French workdays into British tax. Second, private pensions, including a former employer’s occupational scheme and personal pensions that start paying after the move, are normally taxable only in the residence state, which after relocation means France, while government-service pensions paid for past service to the British state, the civil service, the armed forces, the police or a local authority stay taxable only in the United Kingdom. The distinction between a private-sector scheme and a government-service scheme therefore decides the whole pension section of the first return, so obtain the scheme’s classification letter before filing rather than guessing from the scheme name. Third, rent from a British letting stays taxable in the United Kingdom as income from immovable property, and France then taxes it again in the worldwide base but grants a credit equal to the French tax on that rent, which neutralises the double charge while leaving the tenant-country priority intact. Fourth, British dividends and interest fall under the worldwide French base with treaty-capped British withholding and a French credit, which is why the 2047 asks for the gross foreign amount, the foreign tax levied, and the treaty country for each line. The golden filing rule across all four patterns is identical. Declare everything in France, claim the treaty treatment line by line, attach the British vouchers, and never net off the British tax yourself by omitting the income.
Two British traps deserve special attention because they generate the angriest bills. The first is the belief that a British tax-exempt label travels with the income. Cash ISA interest, stocks-and-shares ISA dividends and gains, and premium-bond prizes may be sheltered in Britain, but France does not recognise the wrapper. The worldwide principle in Article 4 A pulls the underlying income into the French base, the 2047 receives it, and only the treaty can soften the charge. The second trap is social charges, the prélèvements sociaux (French social levies on income and capital) that sit on top of income tax. The double tax treaty does not govern social charges, and newcomers affiliated to the British health system under a posted-worker certificate or pensioners holding a British S1 healthcare certificate can in defined situations escape the general social levies on foreign-source income while remaining liable for the narrower solidarity levy. The outcome turns on the affiliation position year by year, so state retirees should staple the S1 to the first return file, and posted workers should keep the A1 certificate with the payslips. Where the computer adds full social charges to British-source income that should carry only the solidarity levy, the overcharge is recoverable through the challenge routes in the next section.
B. Missed Return, Undeclared UK Account or Inflated Bill: How Do You Correct Course and Challenge?
Mistakes in the first French year are common, and French procedure treats a quick, honest correction very differently from silence. Where you spot your own error, file a corrective return through your online personal space or, for the paper channel, send a replacement return marked as rectifying the original, and do it as soon as the missing P60, dividend voucher or bank certificate arrives. The administration accepts spontaneous corrections far more readily than omissions it discovers itself, and a correction filed before any audit notice or reassessment proposal generally confines the cost to the extra tax plus late-payment interest rather than the heavier penalties that attach to concealed income. Keep the sent receipt, the acknowledgment and the replacement figures together, and where the correction increases the bill, pay the supplement with the filing or request a payment plan in the same letter. Where the correction reduces the bill, frame the repayment request explicitly so that it reads as a formal claim and not as a casual remark.
Where the office disagrees with your return, the procedure becomes formal and highly protective, and British newcomers should learn its vocabulary. Article L55 of the Tax Procedure Book provides the gateway. It states that “lorsque l’administration des impôts constate une insuffisance, une inexactitude, une omission ou une dissimulation dans les éléments servant de base au calcul des impôts, droits, taxes, redevances ou sommes quelconques dues en vertu du code général des impôts”, then “les rectifications correspondantes sont effectuées suivant la procédure de rectification contradictoire”. The procédure de rectification contradictoire (adversarial reassessment procedure) means the office must send a proposition de rectification (reassessment proposal) that states precisely, point by point, the legal basis, the figures and the evidence for each adjustment, and must give you at least thirty days to reply. Silence at that stage is the costliest possible answer. Reply within the deadline, contest each disputed head of adjustment separately, attach the British vouchers with translations of the key lines, invoke the treaty article and the 2047 line that already declared the income, and request the opinion of the departmental tax commission for the points that turn on fact. A well-built reply at the proposal stage settles a large share of British-newcomer disputes without any court, because many reassessments come from a computer that never saw the 2047 schedule or misread a sterling amount.
Where no return was filed at all, the office moves to official assessment, and the same discipline applies in reverse. Article L66 of the Tax Procedure Book allows the office to tax officially the taxpayer who has “n’ont pas déposé dans le délai légal la déclaration d’ensemble de leurs revenus”, and an assessment built without your treaty schedules, your deductible charges and your household parts is systematically heavier than reality. The remedy is to regularise immediately. File the missing return late with all three layers complete, send it by tracked post or through the online space with a covering letter asking for the official assessment to be reduced to the declared figures, and follow up until the dégrèvement (tax relief order) appears. Late filing still draws surcharges, but a complete late return almost always costs less than a bare official assessment, and it restores the paper trail you need for any later claim. British newcomers who receive an official assessment in October for a spring return they never understood should treat the assessment as a starting gun, not a final defeat.
Two practical venues then handle the disputes that survive the correspondence stage. The first is the amicable and graduated route inside the administration: the local tax office, the departmental conciliator known as the conciliateur fiscal (tax conciliator), and the formal claim called a réclamation contentieuse (contentious tax claim) sent to the tax director with the assessment notice attached, the disputed heads listed, the legal grounds stated and the repayment or discharge requested. Strict claim deadlines run from the assessment notice, so diarize them the day the avis d’imposition arrives and never let a promised phone call substitute for a written claim. The second venue is the administrative court, the tribunal administratif (administrative court), which hears the appeal once the administration has rejected the claim expressly or by silence. Paris and Île-de-France newcomers file according to their department, with Paris cases going to the Montreuil court for certain taxes and the Paris court for others under the current allocation rules, so check the appeal address printed on the rejection letter rather than guessing. Before either venue, assemble the bundle that wins British-newcomer cases: proof of arrival date, the complete first return with 2047 and 3916, every British voucher, the treaty pages for the disputed category, the reassessment proposal with your dated reply, and the assessment notice with the claim receipt. Judges decide on papers, and a complete, ordered, translated bundle beats a passionate letter every time.
Conclusion
The first French tax year after a move from Britain rewards method and punishes improvisation. Pin down the arrival date that starts French tax residence under Articles 4 A and 4 B, build the three-layer return with the 2042 fed by the 2047 and completed by the 3916 for every British account, and let the 2008 treaty do its work line by line instead of hiding British income that automatic exchange will reveal anyway. Correct your own errors before the office finds them, answer every reassessment proposal within its deadline through the adversarial procedure, and escalate through the formal claim to the administrative court where the figures stay wrong. Done in that order, the British newcomer’s first French return becomes what it should be: a slightly long afternoon of paperwork, a worldwide declaration with treaty relief properly claimed, and a clean file that protects every later year in France.
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