{"id":2142839,"date":"2026-10-09T04:00:30","date_gmt":"2026-10-09T02:00:30","guid":{"rendered":"https:\/\/kohenavocats.fr\/2026\/10\/09\/british-first-french-tax-return-uk-accounts-isa-3916-fine-challenge-brexit\/"},"modified":"2026-10-09T04:00:30","modified_gmt":"2026-10-09T02:00:30","slug":"british-first-french-tax-return-uk-accounts-isa-3916-fine-challenge-brexit","status":"publish","type":"post","link":"https:\/\/kohenavocats.fr\/en\/2026\/10\/09\/british-first-french-tax-return-uk-accounts-isa-3916-fine-challenge-brexit\/","title":{"rendered":"Your First French Tax Return After Brexit: Declaring UK Accounts and ISAs on Form 3916, Paying French Tax on the Interest, and Challenging the 1,500-Euro Fine"},"content":{"rendered":"

You arrived from the United Kingdom in March, signed a French tenancy, registered with the local mairie<\/em> (town hall), and opened a French current account for the rent and the bills. Your UK current account stayed open for the direct debits, your savings sat in a Cash ISA, and a small Stocks and Shares ISA held a handful of British shares. Then May came, and with it your first French income tax return. Nobody at the bank warned you. Nobody at the removal firm mentioned it. And somewhere between the form 2042, the form 2047 for foreign income and an annex numbered 3916, a quiet obligation was waiting that carries a 1,500-euro fine per account, an 80 per cent surcharge on the tax, and, in the worst cases, a legal presumption that the money in your undeclared account was a gift taxed at the highest rate. This guide explains, in plain English and with the exact French texts, who must declare, what France taxes inside your ISA, and how to regularise a late declaration or challenge the bill step by step.<\/p>\n

I. I Forgot to Declare My UK Bank Account in France: Who Must File Form 3916 and Which Income Goes Where<\/h2>\n

A. Are You a French Tax Resident in Your Arrival Year: Home, Stay and Centre of Interests<\/h3>\n

Everything starts with one question, because the declaration duty only binds people who are domiciled or established in France for tax purposes. Article 4 B of the French Tax Code (Code g\u00e9n\u00e9ral des imp\u00f4ts<\/em>, the CGI) sets three alternative tests, and meeting any single one is enough: \u00abSont consid\u00e9r\u00e9es comme ayant leur domicile fiscal en France au sens de l\u2019article 4 A : a. Les personnes qui ont en France leur foyer ou le lieu de leur s\u00e9jour principal ; b. Celles qui exercent en France une activit\u00e9 professionnelle, salari\u00e9e ou non, \u00e0 moins qu\u2019elles ne justifient que cette activit\u00e9 y est exerc\u00e9e \u00e0 titre accessoire\u00bb<\/a>, and the same paragraph adds a third test, \u00abCelles qui ont en France le centre de leurs int\u00e9r\u00eats \u00e9conomiques.\u00bb<\/a> In ordinary language: foyer<\/em> means the home where your family life is centred, s\u00e9jour principal<\/em> means the place where you spend most of the year, and the centre of economic interests points to where your main investments and business ties sit.<\/p>\n

For a British newcomer, the practical effect is blunt. If your spouse and children live with you in Lyon, Bordeaux or Paris while you keep a flat in London, your foyer<\/em> is in France from the day they moved. If you live alone and spent more than half the year in France, your principal stay is in France. If you work for a French employer or run your activity from a French desk, the professional test bites too. Any one of the three makes you a French tax resident, and from that moment your worldwide income falls inside the French return. Article 158 of the CGI states the worldwide principle without ambiguity: \u00absans qu\u2019il y ait lieu de distinguer suivant que ces revenus ont leur source en France ou hors de France.\u00bb<\/a> There is no first-year grace period and no minimum threshold below which the declaration duty disappears.<\/p>\n

Once residence is settled, the account duty follows automatically. Article 1649 A, second paragraph, of the CGI provides: \u00abLes personnes physiques, les associations, les soci\u00e9t\u00e9s n\u2019ayant pas la forme commerciale, domicili\u00e9es ou \u00e9tablies en France, sont tenues de d\u00e9clarer, en m\u00eame temps que leur d\u00e9claration de revenus ou de r\u00e9sultats, les r\u00e9f\u00e9rences des comptes ouverts, d\u00e9tenus, utilis\u00e9s ou clos \u00e0 l\u2019\u00e9tranger.\u00bb<\/a> Read that sentence twice, because British readers consistently misread it in three ways. First, \u00abheld, used or closed\u00bb means a closed account counts: shutting your UK account in February does not erase the duty for the year it was open. Second, duty is simultaneous: form 3916 (and its sibling 3916-bis for certain placements) travels with the annual return, normally filed online in May or June, through your personal space on the tax portal. Third, the duty covers every account \u00abof any kind\u00bb: current accounts, savings accounts, share dealing accounts, and the cash hub that sits inside a Stocks and Shares ISA. The official page for form 3916 on impots.gouv.fr<\/a> confirms the form and its scope, and the English-language service-public.fr guide on declaring accounts held abroad<\/a> walks through who must file and how.<\/p>\n

In practice, your first French return therefore has three layers. The form 2042 carries your total taxable income. The form 2047 (foreign income schedule) carries the detail of each category of UK-source income: interest, dividends, gains. And one form 3916 per UK account carries the administrative references: bank name, address, account number, opening date, and, where relevant, closing date. British clients often ask whether a dormant account with a few pounds still counts. The statute draws no de minimis line for the declaration itself: the references must be declared even if the account earned nothing. The amounts only matter for the tax computation and for the penalty, which is calculated per account, not per euro hidden.<\/p>\n

B. Your ISA, Your Interest and Your Dividends: What France Taxes and What the Treaty Shields<\/h3>\n

The single most expensive misunderstanding in this whole area is the ISA. On the British side the position is genuinely generous. The official gov.uk guidance says you can \u00absave tax-free\u00bb<\/a> with an Individual Savings Account (ISA) Interest on a Cash ISA and gains inside a Stocks and Shares ISA escape UK income tax and capital gains tax, within the annual subscription limits. Many British savers reasonably assume the wrapper travels with them. It does not. French tax law does not recognise the ISA as a tax-exempt envelope. It looks straight through the wrapper and taxes each stream of income under its own heading, exactly as if the ISA did not exist.<\/p>\n

Interest credited inside your Cash ISA is the simplest case. Article 120 of the CGI treats foreign-source investment income as taxable revenue, listing \u00abLes dividendes, int\u00e9r\u00eats, arr\u00e9rages et tous autres produits des actions de toute nature et des parts de fondateur des soci\u00e9t\u00e9s, compagnies ou entreprises financi\u00e8res, industrielles, commerciales, civiles et g\u00e9n\u00e9ralement quelconques dont le si\u00e8ge social est situ\u00e9 \u00e0 l\u2019\u00e9tranger quelle que soit l\u2019\u00e9poque de leur cr\u00e9ation\u00bb<\/a> Your ISA interest therefore joins your taxable income in France even though London charges nothing on it. The mechanism matters here. Article 125 A of the CGI imposes a levy collected at source only where the payer is established in France: \u00absont assujetties \u00e0 un pr\u00e9l\u00e8vement lorsque la personne qui assure le paiement de ces revenus est \u00e9tablie en France\u00bb<\/a> Your UK bank is not established in France, so no French withholding is taken during the year, and the full amount must be picked up on your return. Forget it, and the omission sits in the file until the administration finds it through the automatic exchange of bank information between the United Kingdom and France.<\/p>\n

Dividends inside a Stocks and Shares ISA follow the same French logic with one treaty refinement. They are taxable in France, but the France\u2013United Kingdom double tax treaty of 19 June 2008, published by decree in France, divides the taxing rights. Article 11 on dividends makes a British dividend paid to a French resident taxable in France, while letting the United Kingdom keep a capped withholding tax of up to 15 per cent of the gross dividend where the recipient is its beneficial owner, as set out in the France\u2013United Kingdom tax treaty of 19 June 2008<\/a> In practice, a British company dividend paid to you as a French resident can suffer up to 15 per cent UK withholding, and France then taxes the gross dividend while granting relief for the British tax under the treaty\u2019s elimination article. Two traps deserve attention. First, the old British dividend tax credit no longer helps: France\u2019s own treaty commentary (BOI-INT-CVB-GBR) records that residents of France have not benefited from the British tax credit on dividends distributed since 18 December 2009, so there is nothing to add to the dividend and no matching credit to claim. Second, where UK withholding has genuinely been levied, keep the voucher: without proof of the foreign tax, the French inspector will refuse the credit and the same dividend is taxed twice in cash-flow terms until you produce it.<\/p>\n

Interest is cleaner. Under Article 12 of the same treaty<\/a>, interest arising in one contracting state whose beneficial owner lives in the other state is taxable only in that other state, which for a French resident means France alone UK-source interest belonging to a French resident is therefore taxable only in France. If your UK bank nevertheless deducted British withholding, that deduction is an error to reclaim on the British side through HMRC, not a credit to set against French tax. Do not mix the two treatments: dividends can carry a foreign tax credit, interest cannot, because only France is entitled to tax it.<\/p>\n

Gains realised inside the Stocks and Shares ISA complete the picture. French law taxes \u00ables gains nets retir\u00e9s des cessions \u00e0 titre on\u00e9reux, effectu\u00e9es directement, par personne interpos\u00e9e ou par l\u2019interm\u00e9diaire d\u2019une fiducie, de valeurs mobili\u00e8res, de droits sociaux\u00bb<\/a> under article 150-0 A of the CGI, and selling shares inside the ISA is a disposal for valuable consideration even though no UK tax arises. The default French treatment of this investment income is the flat-rate levy, the pr\u00e9l\u00e8vement forfaitaire unique<\/em> (PFU): article 200 A of the CGI provides that the income tax on the listed investment income and gains \u00abest \u00e9tabli par application du taux forfaitaire pr\u00e9vu au B du pr\u00e9sent 1\u00bb<\/a>, and paragraph B fixes that \u00abtaux forfaitaire\u00bb<\/a> at \u00ab12,8 %.\u00bb<\/a> Social charges (the pr\u00e9l\u00e8vements sociaux<\/em>) apply on top, and you may instead elect for the progressive income-tax scale, the option globale<\/em> for the scale mentioned in article 200 A, where your marginal rate and allowances make that cheaper. Readers who also draw UK rental income while living in France face a different schedule for that rent, explained in our companion guide on British landlords living in France and their UK rental income<\/a>; keep the two computations separate, because the treaty assigns each category of income to its own article and its own relief method.<\/p>\n

II. Challenging the Bill: Regularising a Late Declaration and Fighting the Fine Before the Judge<\/h2>\n

A. The Fine, the 80 per Cent Surcharge and the Donation Presumption: What Silence Really Costs<\/h3>\n

Clients usually discover the problem in one of two ways: a letter from the tax office asking about an account the exchange of information has already revealed, or a notice applying a fine they never saw coming. The scale starts with a fixed amount per account. Article 1736, IV, 2 of the CGI provides that \u00abLes infractions aux dispositions du deuxi\u00e8me alin\u00e9a de l\u2019article 1649 A et de l\u2019article 1649 A bis sont passibles d\u2019une amende de 1 500 \u20ac par compte ou avance non d\u00e9clar\u00e9.\u00bb<\/a> The same paragraph raises the stakes for opaque jurisdictions: \u00abToutefois, pour l\u2019infraction aux dispositions du deuxi\u00e8me alin\u00e9a de l\u2019article 1649 A, ce montant est port\u00e9 \u00e0 10 000 \u20ac par compte non d\u00e9clar\u00e9 lorsque l\u2019obligation d\u00e9clarative concerne un Etat ou un territoire qui n\u2019a pas conclu avec la France une convention d\u2019assistance administrative en vue de lutter contre la fraude et l\u2019\u00e9vasion fiscales permettant l\u2019acc\u00e8s aux renseignements bancaires.\u00bb<\/a> The United Kingdom has concluded such an assistance convention with France, so the ordinary exposure for a British reader is 1,500 euros per undeclared account per year concerned, not 10,000. Count the accounts, not the balance: three forgotten accounts over two years can mean six fines. The administration\u2019s English-language guide confirms the tariff in plain terms, with a \u00abfine of \u20ac1,500 by undeclared account\u00bb<\/a> rising to \u20ac10,000 per account only where the account sits in a state that has no tax-information assistance convention with France<\/p>\n

The fixed fine is only the first layer. The same guide warns of an 80 per cent increase of the duties due on the sums held in the undeclared account or accounts, an increase that then replaces the flat fine of \u20ac1,500 or \u20ac10,000 Where the undeclared account held income that should have been taxed, the 80 per cent increase applies to the duties on those sums instead of the flat fine, which can dwarf 1,500 euros on a well-funded ISA or share account. Interest for late payment runs in addition. And behind both sits a heavier weapon that many advisers underrate: the presumption of a gift. Article 755 of the CGI provides that \u00abLes avoirs figurant sur un compte d\u00e9tenu \u00e0 l\u2019\u00e9tranger, au sens du deuxi\u00e8me alin\u00e9a de l\u2019article 1649 A, […] dont l\u2019origine et les modalit\u00e9s d\u2019acquisition n\u2019ont pas \u00e9t\u00e9 justifi\u00e9es dans le cadre de la proc\u00e9dure pr\u00e9vue \u00e0 l\u2019article L. 23 C du livre des proc\u00e9dures fiscales sont r\u00e9put\u00e9s constituer, jusqu\u2019\u00e0 preuve contraire, un patrimoine acquis \u00e0 titre gratuit assujetti, \u00e0 la date d\u2019expiration des d\u00e9lais pr\u00e9vus au m\u00eame article L. 23 C, aux droits de mutation \u00e0 titre gratuit au taux le plus \u00e9lev\u00e9 mentionn\u00e9 au tableau III de l\u2019article 777\u00bb<\/a> In other words, unexplained money on a foreign account is deemed to be an inheritance or gift taxed at the top rate until you prove otherwise.<\/p>\n

The procedure that leads there is tightly timetabled, and the timetable is your friend if you use it. Article L. 23 C of the Tax Procedures Book (Livre des proc\u00e9dures fiscales<\/em>, the LPF) allows the administration, where the declaration duty has been missed at least once in the previous ten years, to demand explanations \u00abind\u00e9pendamment d\u2019une proc\u00e9dure d\u2019examen de situation fiscale personnelle\u00bb<\/a>, and to require the taxpayer \u00abde fournir dans un d\u00e9lai de soixante jours toutes informations ou justifications sur l\u2019origine et les modalit\u00e9s d\u2019acquisition des avoirs figurant sur le compte\u00bb<\/a> An incomplete answer brings a formal demand to complete it within thirty days, and article L. 71 draws the consequence: \u00abEn l\u2019absence de r\u00e9ponse ou \u00e0 d\u00e9faut de r\u00e9ponse suffisante aux demandes d\u2019informations ou de justifications pr\u00e9vues \u00e0 l\u2019article L. 23 C dans les d\u00e9lais pr\u00e9vus au m\u00eame article, la personne est tax\u00e9e d\u2019office dans les conditions pr\u00e9vues \u00e0 l\u2019article 755 du code g\u00e9n\u00e9ral des imp\u00f4ts.\u00bb<\/a> Tax\u00e9e d\u2019office<\/em> means assessed without your participation, on the administration\u2019s figures, with your appeal rights narrowed to proving the assessment wrong.<\/p>\n

Two recent rulings frame the fight and should lower the temperature on both sides. The first concerns the fine itself. After the Constitutional Council struck down the old 5 per cent proportional fine in decision 2016-554 QPC of 22 July 2016, the question arose whether the fixed fine survived. In its decision of 7 February 2018 (no. 402034), the Conseil d\u2019\u00c9tat recorded the administration\u2019s position that the proportional fine was no longer applied while \u00aben revanche, l\u2019amende fixe codifi\u00e9e au premier alin\u00e9a du 2 du IV de l\u2019article 1736 du CGI rest[ait] applicable\u00bb<\/a> and it closed the case by ruling \u00abLa requ\u00eate de M. B… est rejet\u00e9e.\u00bb<\/a> The lesson is direct: do not waste a challenge arguing that the whole penalty scheme collapsed with the proportional fine. The 1,500-euro fixed fine stands, so aim the challenge at the facts, the procedure and the proof instead. The second ruling concerns the gift presumption. On 17 September 2025, the commercial chamber of the Court of Cassation (appeal no. 23-10.403) upheld the L. 23 C and article 755 machinery against arguments based on legal certainty and free movement of capital, holding that \u00abLes articles L. 23 C du livre des proc\u00e9dures fiscales et 755 du code g\u00e9n\u00e9ral des imp\u00f4ts ne sont, d\u00e8s lors, pas incompatibles avec le principe de s\u00e9curit\u00e9 juridique et le principe de libre circulation des capitaux, garanti \u00e0 l\u2019article 63 du TFUE\u00bb<\/a> and it ended with the words \u00abREJETTE le pourvoi.\u00bb<\/a> Grand constitutional objections therefore fail; concrete paperwork wins.<\/p>\n

B. Regularise and Contest: Corrective Return, R\u00e9clamation and the Tribunal in the Right Order<\/h3>\n

If no letter has arrived yet, regularise now. A spontaneous correction filed before any control or L. 23 C request changes the whole complexion of the file: the income is declared, the 3916 forms are lodged late but lodged, and the only remaining question is the penalty, argued from the position of a taxpayer who came forward rather than one who was caught. File a corrective return online covering each omitted year, attach one form 3916 per account with exact references, and pay the duties and interest shown. Then assemble the paper trail that answers the three questions every inspector asks: where the money came from, when the account existed, and what it earned. For origin, keep UK employment contracts and payslips, sale deeds for a British property, probate documents for an inheritance, and the bank statements showing the transfers into the account. For existence, keep opening letters, annual statements and closure confirmations, because the 3916 requires precise dates and the fine is argued per account and per year. For earnings, keep ISA annual summaries, dividend vouchers showing any UK withholding, and interest certificates. Where a dividend bore genuine UK withholding within the 15 per cent treaty cap, claim the French credit with the voucher attached; where UK withholding was taken on interest, reclaim it from HMRC and say so in the French file so the inspector does not treat the reclaimed sum as a second income.<\/p>\n

If the fine or an assessment has already landed, challenge it in the strict order French procedure imposes. Start with the r\u00e9clamation contentieuse<\/em>, the written claim to the administration. Article L. 190 of the LPF defines its territory: \u00abLes r\u00e9clamations relatives aux imp\u00f4ts, contributions, droits, taxes, redevances, soultes et p\u00e9nalit\u00e9s de toute nature, \u00e9tablis ou recouvr\u00e9s par les agents de l\u2019administration, rel\u00e8vent de la juridiction contentieuse lorsqu\u2019elles tendent \u00e0 obtenir soit la r\u00e9paration d\u2019erreurs commises dans l\u2019assiette ou le calcul des impositions, soit le b\u00e9n\u00e9fice d\u2019un droit r\u00e9sultant d\u2019une disposition l\u00e9gislative ou r\u00e9glementaire.\u00bb<\/a> Fines are expressly included, so the r\u00e9clamation can attack the 1,500-euro penalty head-on: wrong account count, account outside the period, duplicate fine for a single account, declaration actually filed, or force majeure. Mind the clock. Article R*196-1 of the LPF requires most claims to reach the administration \u00abau plus tard le 31 d\u00e9cembre de la deuxi\u00e8me ann\u00e9e suivant celle\u00bb<\/a> of the recovery or payment, and a late r\u00e9clamation dies on admissibility before the merits are ever read. Send it by a traceable route, keep the receipt, and diary the administration\u2019s six-month reply period: silence for six months is an implied refusal you can take to court.<\/p>\n

The court is the tribunal administratif<\/em> (administrative court) of your home address, and article R. 421-1 of the Administrative Justice Code sets the rhythm: \u00abLa 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.\u00bb<\/a> Two months from an express refusal, or from the implied refusal born of silence. For readers in Paris and the \u00cele-de-France, the practical geography is simple: the local service des imp\u00f4ts des particuliers<\/em> (SIP, the personal tax office) handles the return and the r\u00e9clamation, the tribunal administratif de Paris hears Paris-based challenges at first instance, and appeals go to the cour administrative d\u2019appel de Paris. Whatever the venue, the winning bundle looks the same: the filed 3916 forms, the bank proofs of origin and dates, the dividend vouchers, the HMRC reclaim correspondence for interest, and a short chronology showing spontaneous correction before any request where that is true. Ask the judge for discharge of the duties with interest where the treaty or the scale option supports it, reduction or discharge of the fine where the facts support it, and, where the gift presumption was applied, rebuttal with the origin documents, because article 755 presumes only \u00abuntil proof to the contrary\u00bb and a documented transfer history is exactly that proof.<\/p>\n

Conclusion<\/h2>\n

Your first French tax return as a British resident turns on three reflexes. Declare every UK account on its own form 3916, open or closed, earning or idle. Tax the ISA as France sees it, stream by stream, letting the treaty cap the British dividend tax at 15 per cent and reserve interest to France alone. And if a fine or a presumption arrives, answer with documents in the order the procedure demands: correction, r\u00e9clamation, then the tribunal within its two months. The fixed fine survives grand challenges and the gift presumption has the highest court\u2019s blessing, but both yield to precise facts proved on paper. This guide is written as the hub for the British newcomer\u2019s tax file; keep it with your 3916 receipts, and let each later year be a routine copy of a file put right the first time.<\/p>\n","protected":false},"excerpt":{"rendered":"

First French tax return after Brexit? 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