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Forgot to Declare a Foreign Account: What Should You Do?

| Foreign Accounts

Have you forgotten to declare your foreign account?

Failing to declare one or more bank accounts held abroad has various tax, and even criminal, consequences. But solutions exist. Our tax law firm has attempted to describe, in simple terms, what is often a complex situation.

Understanding what is at stake with this omission

Holding a foreign bank account is, save for exceptions, not illegal.

What is illegal, however, is failing to declare it to the tax authorities (administration fiscale).

The declaration of foreign bank accounts must be made every year, using form no. 3916, and by ticking box 8UU on form no. 2042.

A certain amount of information is requested, such as your name, address, the bank's address, the account number, its opening date, etc.

However, you are not asked for the balance of the account(s).

If you have forgotten, it is possible to regularise the situation voluntarily.

Please note that voluntary regularisation in no way exempts you from the various applicable penalties and surcharges.

The tax cost of this voluntary regularisation will therefore, broadly speaking, be fairly close to the tax cost of a tax audit. Only the late-payment interest will be reduced in the case of voluntary regularisation (late-payment interest of 0.20% per month, i.e. 2.40% per year since 2018, is reduced by half, subject to conditions, where an amended return is filed voluntarily). The penalties and surcharges will, on the other hand, be the same as in the case of a tax audit.

However, voluntary regularisation has 3 advantages:

  1. a reduced risk of criminal prosecution
  2. a more favourable tax context. In the case of voluntary regularisation, the tax authorities will, in principle, be less "harsh" than in the case of a tax audit (see the rest of the article, which explains the points on which the authorities may be more flexible)
  3. an end to the psychological stress caused by the failure to declare one's foreign account and by the risk of a tax audit (which generally lasts a long time and is very often experienced as stressful by the taxpayer)

Please note, however, that the advisability of voluntary regularisation must be carefully assessed.

Although it is generally recommended to voluntarily regularise one's foreign accounts, in some cases this regularisation can lead straight into a brick wall, mainly where proof of the origin of the funds cannot be provided (where you have no document proving the origin of the funds, which is quite rare); consult a tax lawyer to assess matters in your case.

Indeed, where the taxpayer is unable to prove the origin of the funds, there is a rule that allows the tax authorities to tax at 60% all of the foreign assets; the tax consequences are therefore enormous and amount, broadly speaking, to a kind of confiscation (because, in addition to the 60% taxation, there are fines, taxation of the income generated by the accounts each year for the past 10 years, any additional wealth tax (ISF) each year for the past 10 years, surcharges, etc.).

What should you do if you have forgotten to declare your foreign account?

Consult a professional, such as a tax lawyer, in order to assess whether, in your specific case, it is advisable to regularise the situation voluntarily.

Voluntary regularisation consists in voluntarily submitting to the tax authorities a file containing all of the omitted returns, together with other types of documents.

In most cases, this is a substantial, or even very substantial, file.

Indeed, this file must include:

  • a written statement on the origin of the funds (explaining where the funds come from), accompanied by all of your supporting documents proving that origin
  • a sworn statement (a document in which you affirm that you do not hold any other undeclared accounts)
  • all of the "forgotten" income tax returns (foreign accounts have often generated income, such as interest, dividends and capital gains). All of the omitted 2047 and 2042 returns for the last 10 years will have to be produced
  • any wealth tax (ISF) returns that are not time-barred (if your assets exceeded the threshold), the ISF having been replaced by the real estate wealth tax (IFI) in 2018
  • all of the foreign account declarations for the last 4 years (3916 declarations)
  • the statements of assets (bank document showing the balance at 31 December of each of the last 10 years)
  • the summary statements of foreign income (bank document showing, for each of the last 10 years, the income generated by the account)
  • where necessary, for example, any omitted gift, inheritance or real estate capital gains returns

As you can see, this is a substantial and technically complex file to produce.

However, it makes it possible to fully clean up your situation with the tax authorities.

The tax cost (i.e. the amount of the reassessments and fines) will depend on your specific situation. It may be high, or close to 0, depending on the case.

The greater the number of years to be regularised and the higher the amount of your assets in your foreign account, the higher the tax cost will be.

The tax cost of regularisation depends mainly on these two factors:

  1. the number of years to be regularised. Indeed, if your foreign account has existed for decades, the number of years to regularise will be high (10 years to be regularised). If your account was opened only a few years ago, the number of years to be regularised will be smaller, as will the tax cost of the reassessments; there are also other exceptions that may reduce the period, so consult your tax lawyer
  2. the amount of your assets abroad. The larger your assets, the higher the tax cost will, in principle, be

The two most problematic cases

All kinds of situations are possible depending on the history of your foreign accounts.

But two cases are much more problematic than the others:

  1. Where you are unable to prove the origin of the funds, i.e. where you have no document to justify the origin of your funds. In that case, the tax authorities may use an article of the French General Tax Code (Code général des impôts) that allows them to tax at 60% all of your assets.
  2. Where undeclared sums (for example, cash derived from a professional activity) have been paid into the foreign account during the last 10 years. In that case, the tax authorities are entitled to tax all of the amounts received (during the last 10 years only) and to apply substantial surcharges of 80%, as well as late-payment interest

Apart from these two cases, voluntary regularisation will generally be the right solution, even though its cost will generally remain significant.

The tax cost will consist of:

  • fines for undeclared foreign accounts (€1,500 per year and per account, over 4 years)
  • any additional wealth tax (ISF) due, from 2010 to 2017 (if we are in 2020)
  • additional income tax, over the last 10 years, due on the income generated by the foreign account (interest, capital gains, dividends, etc.)
  • possibly, "forgotten" gift tax if the funds come from a gift (subject to international treaties, which may in some cases spare you from paying this gift tax), "forgotten" inheritance tax if the funds come from an inheritance that took place less than 10 years ago (subject to international treaties, which may in some cases spare you from paying this inheritance tax), etc.

It is therefore advisable, before proceeding with a voluntary regularisation, to consult a professional so that they can quantify the cost of the regularisation. You will then be fully informed of the consequences of the regularisation and can make your decision without fear of any unpleasant surprises.

If you have forgotten to declare your foreign account: the firm's advice

  1. meet a tax lawyer experienced in the regularisation of foreign accounts, in order to fully understand what is at stake in your specific situation and to assess the advisability of regularisation in your specific situation
  2. start gathering the main documents (or, if you do not have them, start requesting them from your bank): all documents showing the origin of the funds, and all of your foreign account bank statements for the last 10 years
  3. forget everything you may have read or heard in the media: every situation is different and the consequences vary greatly from one situation to another
  4. reduce the stress and move on to concrete actions (meeting a professional, starting to gather your documents, etc.)

Our tax law firm can assist you.

Need Help?

CONTACT THE FIRM

Client Reviews

Google reviews, originally in French

Excellent accompagnement de Maître Uzan. Très professionnel, disponible et clair dans ses conseils, notamment pour ma première déclaration fiscale en France après de nombreuses années à l'étranger. Dossier parfaitement suivi. Je recommande vivement.

Google reviewAugust 2026

Très satisfait de l'accompagnement de cet avocat fiscaliste pour la régularisation de mes comptes à l'étranger. Professionnel, compétent et à l'écoute, il a su m'expliquer clairement les démarches et m'accompagner avec sérieux tout au long du processus. Je recommande vivement ses services !

Google reviewAugust 2026

Je suis venu consulter Maître Uzan pour une question fiscale en apparence assez simple, mais qui me préoccupait depuis un certain temps. Il m'a apporté une réponse claire, précise et rassurante. Je recommande vivement cette consultation à toute personne ayant des interrogations fiscales : plutôt que de chercher pendant des heures sur Internet, il est beaucoup plus utile de consulter un professionnel. On obtient une réponse adaptée à sa situation, ce que internet ou l'IA ne peuvent pas fournir.

Google reviewJuly 2026

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Google reviewApril 2026

Deux expériences très bonnes avec Maître Marc Uzan. Compétent, disponible et efficace. Tout a pu être réglé à distance dans deux affaires personnelles concernant le droit international (France -Allemagne). Visios, mails : échange courtois et précis. On a avancé très rapidement. Je recommande chaleureusement.

Google reviewJanuary 2026

Excellent conseil, particulièrement réactif et très pédagogue. Je ne peux que recommander chaudement!

Google reviewDecember 2025

J'ai eu la chance d'être accompagnée par Maître Uzan dans le cadre d'une succession internationale entre la France et les États-Unis, et je ne peux que le remercier chaleureusement pour son aide précieuse. Dans une période déjà émotionnellement difficile, il a su faire preuve d'une grande écoute, d'empathie et d'un professionnalisme irréprochable. Il a rendu compréhensibles des démarches fiscales complexes, en tenant compte à la fois des enjeux familiaux et des spécificités des deux systèmes (français et américain). Grâce à lui, tout s'est déroulé de manière fluide et sereine. Un avocat humain, compétent et engagé – je le recommande de tout cœur.

Google reviewOctober 2025

Il y a un an nous recevions un courrier du fisc sur des comptes étrangers. Après de nombreux échanges où nous avons donné au fisc tout ce qu'il demandait et montré notre bonne foi, rien n'y a fait. Il a fallu prendre un avocat et là comme par magie les choses ont été différentes...Il est bien dommage de devoir en arriver là pour faire valoir ses droits. En tout cas nous remercions Me Uzan pour son accompagnement et pour avoir trouvé un terrain d'entente avec le fisc, nous sommes soulagés que tout ca se termine.

Google reviewJuly 2024

Monsieur UZAN est un expert dans le domaine de la fiscalité, il maîtrise son sujet. Sa connaissance et son professionnalisme sont rares dans ce domaine. Merci.

Google reviewOctober 2024

J'ai bénéficié de conseils pertinents et précis au niveau de la fiscalité de mes activités ; questions à propos desquelles je n'avais par ailleurs jamais trouvé de réponse. Je commençais à m'inquiéter car les enjeux étaient importants et il fallait que la situation s'apaise en se clarifiant. Tout est devenu limpide et je peux à présent avancer sereinement. Je recommande Me Uzan pour son professionnalisme et sa courtoisie.

Google reviewFebruary 2024

Nous avons eu la mauvaise surprise de recevoir une "proposition de rectification" (contrôle fiscal) en fin d'année. Après avoir essayé de discuter avec le contrôleur j'ai vite compris qu'il était indispensable de se faire accompagner par un avocat car il n'est malheureusement pas possible d'échanger de manière constructive en cas de contrôle. L'erreur était flagrante et Me Uzan a réussi à donner les bons arguments. Résultats : quasiment tout a été annulé. J'ai aussi fait appel à son expertise pour notre retour en France et il a été de très bons conseils.

Google reviewFebruary 2023

La contrôleuse ne voulait pas entendre nos explications depuis plus d'un an et grâce à Maître Uzan le dossier a pu être clôturé rapidement.

Google reviewDecember 2023

Maître Uzan a su apporter des réponses claires et rapides à mes questions. Sa réactivité et ses explications m'ont permis d'avancer sereinement dans mes affaires. Je le recommande vivement !

Google reviewSeptember 2021

M. Uzan nous a accompagné durant près d'un an dans notre dossier de compte étranger. Il a été disponible et son expertise dans ce domaine nous a permis de traverser cette épreuve très stressante.

Google reviewDecember 2021

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Marc Uzan Avocat Fiscaliste

Marc Uzan, Tax Lawyer

Maître Marc Uzan has been a Tax Lawyer in Paris for more than 20 years.

He holds a Master’s degree in Taxation from the Paris Law University, is a graduate of ESSEC, and holds the DSCG (French higher diploma in accounting and management).

Before founding his own law firm, he worked in major international law firms.

He advises individuals and companies on international inheritance, international taxation, tax audits, foreign accounts, returning to France (impatriate regime), leaving France (tax expatriation), tax litigation, negotiation with the tax authorities, appeals before the courts, RSUs, stock options and free share awards, foreign real estate, foreign income, tax returns, local taxes and tax planning.

He has handled more than 300 tax audits, more than 250 foreign account procedures, and more than 200 appeals before the tax courts.