Keeping a UK current account, savings account or investment account after moving to France is perfectly common. Forgetting to report that account to the French tax administration is a different matter. For a British citizen who became French tax resident after Brexit, the question is not whether the money remains in sterling, whether the bank is familiar, or whether the account produced no interest. The first question is whether France required the account itself to be disclosed for the relevant tax year. The second is whether interest, dividends, gains or transfers must also be reported as income or assets. Those are separate questions, with separate evidence and sometimes separate penalties.

This guide deals with the person who lives in France and has missed a foreign-account declaration, rather than with the purchase of French property or the creation of a company. It explains the French Form 3916/3916 bis process, the special treatment of UK accounts, the distinction between an omission and taxable income, the documents to gather, and the response to a tax notice. The practical objective is to correct the record without making an avoidable admission or losing a procedural deadline. Rules can depend on the years involved, the type of account, the date French tax residence began and the way funds moved. A British resident in France should therefore build a year-by-year file before submitting a correction.

I. Must a British resident in France declare a UK bank account after Brexit?

A. When does the French declaration apply, and which UK accounts are covered?

Brexit did not turn a UK bank account into a French account. If the account is held with a bank established in the United Kingdom, it is normally a foreign account for French reporting purposes, even if the account holder is British, the account is denominated in pounds, the customer uses a French address, or the account is used to pay French household bills. The relevant trigger is generally the taxpayer’s French tax residence and the account’s location, not nationality.

The central rule is Article 1649 A of the French Tax Code (Code général des impôts, or CGI). It requires a person domiciled or established in France to disclose the references of accounts opened, held, used or closed abroad at the same time as the annual income return. The French text uses the sequence “ouverts, détenus, utilisés ou clos”. In practical terms, a British resident should not assume that an account can be omitted merely because it was inactive during the year. Current administrative guidance treats an account held on 1 January or 31 December as relevant even when it had no meaningful transactions.

The obligation normally covers:

• a UK current account used for salary, pension, direct debits or transfers;
• a UK savings account, even if the balance stayed unchanged;
• a cash account linked to an investment platform, where the platform or bank is outside France;
• a joint account, where the French resident is a co-holder;
• an account on which the taxpayer has a power of attorney or authority to operate it, subject to the facts and the applicable exception; and
• an account opened, held, used or closed during the year, including an account closed after the taxpayer moved to France.

The phrase “UK bank account” is not sufficiently precise for a correction file. Record the legal name and country of the institution, the account number or IBAN, the opening and closing dates, the account holder, every co-holder, every authorised person, and the highest balance by year. A British bank may operate a service through a group company in another country. The institution’s contractual entity and registered address matter more than the branding on the app. If the account is held with an electronic-money provider, broker or investment platform rather than a traditional bank, classify it separately and check the contractual entity before choosing the form.

There is a narrow exception for certain accounts used solely for online purchases or sales. The exception is cumulative: the account must be linked to an account opened in France, the account must be used for payments connected with online sales or purchases, and the annual receipts connected with those sales must stay within the statutory threshold. A personal UK current account used to receive a pension or pay bills will not normally meet that exception. The safest approach is to treat an ordinary UK account as reportable unless the facts clearly satisfy every condition and the file records why.

French residence is also a year-by-year question. A person who moved from Manchester to France in September may need to analyse the residence rules, the centre of personal and economic interests, the treaty tie-breaker and the exact return filed for that year. The popular “183-day rule” is not a complete answer. Someone can become French tax resident before spending 183 days in France, while a person who remained UK resident under the applicable treaty can have a different position. Keep the move date, accommodation, family, employment, business activity and treaty residence evidence together. The foreign-account form should follow the residence analysis; it should not be filed on an assumed date simply because the first French utility bill arrived then.

If this question arises as part of a first move to France, the broader guide to a first French tax return, split-year residence and UK bank accounts provides the wider residence context. This article then focuses on the narrower problem of a foreign-account declaration that was missed or needs correction.

The UK-France tax treaty allocates taxing rights over income. It does not generally abolish a French information-reporting obligation for a foreign account. The GOV.UK guidance for people living in France also warns that foreign assets such as bank accounts may have to be declared separately from the annual income return. That is an important distinction for a British taxpayer: a UK account can be reportable in France even when the capital is not itself income and even when an item of interest is dealt with under treaty relief.

B. Which form, information and income disclosures are required?

The French online filing system and the official Form 3916/3916 bis use a combined French title for the declaration by a French resident of an account abroad, a capitalisation contract or a life-insurance arrangement. For a standard UK bank account, use the bank-account section and complete a separate declaration for each reportable account. The “3916-bis” wording is commonly used by taxpayers and search engines, but the current online form may display the combined 3916/3916 bis reference. Do not let the label obscure the essential task: identify each account and match it to the correct year.

Before opening the form, make a schedule with one line per account and one column per tax year. The minimum working file should contain:

• the bank’s legal name, country and address;
• the account number, IBAN or other identifier;
• the opening date and, if applicable, the closure date;
• the names of the holder, co-holder and authorised representative;
• the account type and currency;
• the highest balance or the information requested by the current form;
• the years for which the account was held while the taxpayer was French tax resident; and
• the interest, dividends, distributions, gains and significant transfers that need a separate tax analysis.

One form is not a substitute for a complete return. The foreign-account form tells the French administration that the account exists. It does not, by itself, report bank interest, UK dividends, investment gains, pension income or a sale of shares. Those items belong in the relevant income or wealth declarations. Article 170 of the CGI requires a detailed income declaration, and its wording refers to “une déclaration détaillée de ses revenus”. A taxpayer who corrects the account form but leaves taxable interest out of the income return may solve only half of the problem.

Conversely, an account declaration is not an admission that the entire balance is taxable income. A balance may represent savings accumulated before French residence, salary already taxed, an inheritance, a loan, the proceeds of a sale, or transfers between the taxpayer’s own accounts. The origin and timing still need evidence, but the existence of the account and the tax character of its balance must be analysed separately. This is particularly important for a British citizen who moved savings from a UK account to a French account after the move: the transfer may explain the source of funds without turning the capital into new income.

UK products need careful classification. A normal savings account may generate interest. A dividend-paying investment account may contain several taxable events. A pension wrapper, individual savings account or life-insurance product may have its own French treatment and may not be dealt with by simply copying the bank-account line. If a UK provider combines cash, securities and insurance within a single platform, preserve the contractual terms and request a product description. Do not rely on the British marketing name alone. A French tax return should reflect the legal and economic substance of the product.

Double taxation relief is a separate calculation. The GOV.UK foreign-income guidance explains that a UK resident may have to report foreign income and may claim foreign tax relief where the conditions are met. A French resident should not apply that UK instruction mechanically: French residence, the treaty article concerned, the source of the income and any UK withholding must be reviewed together. Keep UK tax returns, P60s, pension statements, dividend vouchers, withholding certificates and French tax notices. The goal is not to report the same income twice, but neither is it to omit an item because the other country may have taxing rights.

If a declaration was omitted, the correction should normally identify the relevant years and accounts rather than quietly adding the account to the next current return. Use the current online service or the channel indicated by the taxpayer’s service des impôts des particuliers (SIP, the local individual tax office), retain the submitted PDF or acknowledgement, and explain the chronology in a short covering letter. The letter should be accurate, factual and limited to what can be proved. A clear chronology is often more useful than a long explanation of Brexit.

For context, the official Service-Public explanation of foreign accounts confirms that the disclosure is made with the income return and that the account declaration does not replace the income declaration. It also sets out the fixed-fine framework. Read the current form and current guidance for the years being corrected; form layout and electronic labels can change.

II. What happens if the UK account was not declared, and how can you correct it?

A. What penalties, tax reassessment and evidence issues can arise?

The first financial risk is the fixed fine for failing to comply with the foreign-account declaration. Article 1736 of the CGI provides the statutory framework. The commonly quoted amount is €1,500 per account and per year, with a higher €10,000 amount for an account in a state or territory that has not concluded the relevant assistance convention. The correct amount depends on the law applicable to the year, the account’s jurisdiction and the legal characterisation of the omission. A British account should not automatically be put in the €10,000 category simply because the United Kingdom is outside the European Union. For an ordinary UK account, the no-assistance branch is not the default assumption, but the cooperation position for the relevant year should be checked.

That figure is not a universal price list for every mistake. It can be affected by the number of accounts, the number of years, a statutory exception, an account that was not actually held by the taxpayer, a duplicate filing, a genuine non-residence year, or an error in the administration’s calculation. It can also sit alongside a reassessment of income. A rough illustration shows why the schedule matters: one account omitted for two years may expose the taxpayer to two account-year calculations; two accounts omitted for four years may produce eight account-year calculations. That illustration does not decide liability, reduce the administration’s discretion or replace a year-by-year legal review.

The second risk concerns income connected with the account. If interest, dividends or gains were not included in a French income return, the tax administration may reassess the missing income, add late-payment interest and consider a tax penalty. Article 1727 of the CGI states: “Le taux de l’intérêt de retard est de 0,20 % par mois.” The interest is calculated on the additional tax due and is not the same thing as the fixed foreign-account fine. For inaccuracies or omissions in a tax return, Article 1729 of the CGI contains different uplift levels depending on the conduct and circumstances. Do not describe an omission as deliberate fraud before the evidence has been assessed.

There is also a special provision for rights assessed from sums held in accounts that should have been declared. The current Article 1729-0 A of the CGI can apply an 80% uplift to rights due in the circumstances set out by the statute, subject to its own minimum and coordination rules. It does not mean that every unreported account automatically creates an 80% charge on the balance. The administration must identify taxable rights and the statutory condition; the taxpayer can dispute the tax character of the sums and produce contrary evidence. This is one reason not to answer a notice with a bare statement that the account was “forgotten” if the real issue is a historic capital transfer.

The recovery period can be longer than a taxpayer expects. The relevant provisions of the French Tax Procedure Book concerning the recovery period include a ten-year period for certain income or assets connected with a failure to comply with the foreign-account obligation. The statutory text also contains an important limitation where the total credit balances of the relevant accounts never exceeded €50,000 in the year concerned and the extension is being used only for income or benefits connected with the account. The period must therefore be checked against the account balances, the tax assessment and the precise adjustment. Never assume that every year in a British bank statement is automatically open, and never assume that an old year is automatically closed.

In a more intrusive information request, Article L.23 C of the French Tax Procedure Book allows the administration, when the statutory conditions are met, to request information about the origin and acquisition of assets after a failure to declare foreign accounts. The taxpayer may have a 60-day period to answer, followed by a formal 30-day notice if the answer is incomplete. This is not a reason to panic, but it is a reason to build an evidence file before replying. The administration may ask where the money came from, when it was earned, whether it was already taxed, and why it moved between UK and French accounts.

The case law shows why a transfer and taxable income should not be confused. In Conseil d’État, 17 March 2014, no. 358520, the court used the formulation “les fonds ayant transité par ce compte constituent des revenus imposables” unless the taxpayer supplied contrary proof. The decision is a warning about unexplained flows, not a rule that every pound ever saved becomes income. The taxpayer needs a transaction map: opening balance, salary, pension, interest, sale proceeds, gifts, inheritance, loan, transfer between own accounts and closing balance.

In Conseil d’État, 5 February 2021, no. 438853, the court examined an account and the movement of its balance to a French account. The phrase “sauf preuve contraire” is decisive in understanding the presumption. If a statement shows a large transfer, the practical response is not to deny the transfer; it is to show its source and tax treatment. Bank statements, completion statements, pension records, probate papers, loan agreements and earlier tax returns can turn an unexplained credit into a documented capital movement.

The fixed-fine framework has also been litigated. Conseil d’État, 18 May 2016, no. 397826 dealt with the former penalty regime and its legal challenges. Its existence is useful for two practical reasons: the fine is a statutory issue distinct from an income reassessment, and the version of the law in force for the relevant year matters. A letter that quotes today’s amount without checking the year can weaken an otherwise sound correction.

Finally, do not use old case law to avoid current reporting. Conseil d’État, 4 March 2019, no. 410492 addressed the older question of when an account was “utilisé”, including credits such as interest and management charges. The administrative doctrine now distinguishes the historical litigation from the rule applying to accounts held from 1 January 2019, for which the fact of holding the account is central. A British resident who retained an unused account after Brexit should therefore not rely on an argument that no debit card was used.

Evidence should be assembled in a form that a French tax officer can follow. A useful index has a tab for each account and year:

• the bank’s confirmation of the holder, address and opening or closure date;
• annual statements in the original currency and, where necessary, a conversion calculation;
• the opening and closing balance and a list of credits above an agreed threshold;
• proof of salary, pension, dividend, interest or sale proceeds for material credits;
• French and UK tax returns, assessments, withholding documents and treaty residence evidence;
• inheritance, gift, loan, divorce or property-sale documents explaining capital;
• copies of every Form 3916/3916 bis, income-return correction and acknowledgement; and
• a reconciliation showing that the same transfer was not counted as both income and capital.

Keep the explanation proportionate. A small dormant current account with no income needs a different presentation from a portfolio account receiving dividends and six-figure transfers. The administration should be given enough to understand the source and tax treatment, but a confused bundle of unindexed statements can conceal the very evidence that supports the taxpayer.

B. How should you regularise the omission or challenge a notice?

A British resident who discovers the omission should act in a sequence. The following is a practical workflow, not a promise that a voluntary correction will remove a statutory fine.

1. Fix the residence timeline. List every year in which France may have been the taxpayer’s tax residence, including the move year. Record the date of arrival, family and work links, available accommodation, treaty residence position and any year in which the taxpayer filed as a non-resident. If the residence year is wrong, correcting the account form without correcting the underlying return can create a new inconsistency.
2. Inventory every non-French account. Search bank apps, old statements, HMRC records, pension files and correspondence for accounts that were opened, held, used or closed. Include joint accounts and authority arrangements. Note whether a platform’s legal entity is in the UK or another country. Do not silently delete a closed account from the schedule; record its closure date.
3. Separate account disclosure from income analysis. For each year, mark interest, dividends, gains, pension payments and transfers of capital. Identify what was already reported in France or the UK. If a transfer came from an account already owned by the taxpayer, link both statements. If it came from an employer, pension provider, estate or sale, locate the supporting document.
4. Use the correct form and years. Complete the current Form 3916/3916 bis for each account and each relevant tax year, following the filing route directed by the online service or SIP. Keep the submitted copy and acknowledgement. If income returns must be amended, use the appropriate correction route for those years rather than inserting historic figures into the next ordinary return.
5. Send a controlled covering explanation. State the account, years, residence chronology, discovery date and corrective documents. Explain the reason for any late filing without speculating about legal conclusions. If the facts are complex, obtain advice before sending a narrative that could be read as acknowledging unreported taxable income, intentional concealment or an incorrect residence position.
6. Answer a notice by its deadline. Identify whether the document is a request for information, a proposition de rectification (tax adjustment proposal), a fixed-fine notice or a formal request for the origin of assets. Check the response period, the account-year calculation and the legal provisions cited. Ask for the missing calculation or documents if the notice is unclear, and preserve proof of delivery.
7. Challenge only the points supported by evidence. Possible issues include a year in which the taxpayer was not French tax resident, a bank account outside the statutory scope, a genuine exception, a duplicate account, a wrong holder, an incorrect jurisdiction, a penalty calculated under the wrong version of the law, or a capital transfer treated as income without allowing contrary proof. A blanket denial is rarely as useful as a precise reconciliation.

When the administration proposes an adjustment, the response should address both law and facts. The procedural provisions on the reasoned adjustment and the taxpayer’s observations are found in the French Tax Procedure Book; the proposal should be understandable enough for the taxpayer to respond. A commercial chamber decision, Cour de cassation, 3 July 2019, no. 17-24.751, also illustrates the importance of identifying the legal and factual basis of an adjustment. The decision is not a foreign-account case, so it should be used only for that procedural principle, not as a substitute for the Conseil d’État decisions above.

If the first exchange does not resolve the issue, the taxpayer may need to make a formal réclamation contentieuse, meaning a formal tax claim, within the applicable deadline. The current procedural time limits should be checked in Article R*196-1 and the surrounding provisions for the type of tax and notice concerned. A claim should identify the assessment, explain the legal and factual grounds, attach the evidence and request a precise correction. Keep the administration’s acknowledgement and every subsequent reply.

Do not assume that calling the SIP will stop the clock. A telephone conversation can clarify which service is responsible, but it does not necessarily constitute a formal claim or a timely response. Use the secure message service, registered delivery or the channel stated on the notice, and retain the timestamp. If an online portal rejects an attachment, take a screenshot, reduce the file to a readable size without deleting pages, and use the alternative filing route stated by the administration.

A sensible voluntary correction file usually contains a short chronology followed by a table. For example:

• “September 2021: moved to France; residence analysis attached.”
• “2021–2023: UK current account held with the same bank; no closure; no investment income.”
• “March 2022: £18,000 transfer from the taxpayer’s pre-existing UK savings account to the French account; statements and earlier tax evidence attached.”
• “2022: £42 bank interest received; reported or corrected on the relevant income return.”
• “2024: account disclosed for the first time; historic forms and acknowledgement attached.”

That format lets the administration distinguish the existence of a late form from a question about undeclared income. It also exposes gaps before the tax officer finds them. If the account contained UK dividends, pension withdrawals, investment gains or proceeds from an inheritance, add a separate tax memo for that item rather than hiding it in a general paragraph.

A correction can still be appropriate when the account has already been mentioned elsewhere. For example, the account may appear in a wealth statement, a bank transfer explanation or a UK tax return without having been included on the French foreign-account form. The evidence of disclosure in another document may help on intent or the factual chronology, but it does not automatically replace the form required by Article 1649 A. State exactly what was filed, where it was filed and what remains missing.

British readers should also avoid two opposite errors. The first is assuming that France cannot ask about a UK account because the UK is a treaty partner. The second is assuming that any contact from the French administration means the full account balance is taxable. The treaty, the account-reporting rule, the income rules and the evidence of capital all operate together but do different jobs. A UK tax return may support the evidence, yet it will not necessarily satisfy a French form requirement. A French account declaration may satisfy the reporting step, yet it will not necessarily correct missing UK-source income.

For a serious omission, obtain a file review before sending the first correction if the years are numerous, the balances are high, the account is connected to a trust or company, the taxpayer has moved several times, the account contains investment products, or a notice refers to a request for the origin of assets. The review should answer four questions: which years are open, which forms are missing, which amounts are income rather than capital, and what response preserves the taxpayer’s procedural position. That is a more useful starting point than guessing the penalty from a search result.

Conclusion

A UK account kept after Brexit can remain reportable in France even when it is inactive, denominated in pounds, used only for household payments or funded with savings earned before the move. The account declaration and the taxation of its income are separate. A missed Form 3916/3916 bis can lead to a fixed account-year fine, while omitted interest, dividends or unexplained transfers can create a separate tax discussion. The outcome depends on the residence timeline, account location, years involved, statutory version, evidence and the administration’s exact notice.

The safest correction is structured: establish French residence year by year, inventory every account, reconcile transfers, correct the relevant forms and income returns, preserve acknowledgements, and answer any request within its deadline. The official sources and decisions cited above show both the risk of unexplained funds and the importance of contrary proof. A British taxpayer should correct an omission with a documented chronology, not with an improvised admission or a silent next-year filing.

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