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Tax Audit: Good and Bad Practices

| Tax Audits (General)

An incomplete return, anomalies, vague explanations… Various scenarios may prompt the tax authorities to launch a tax audit. In that case, certain practices should be adopted and others avoided.

How should you react in the event of a tax audit?

What is the right conduct to adopt when the tax authorities contact you?

What mistakes should you avoid during a tax audit?

To help you get through your tax audit successfully, discover now the complete guide to good and bad practices when dealing with the tax authorities, written by your tax lawyer.

Reply to any request for information

When you receive a request for information from the tax authorities, the time allowed to reply is generally 30 days.

It is better to reply promptly and precisely. Indeed, if your affairs are in order, you will thereby avoid a tax reassessment proposal (proposition de rectification).

In any event, your silence is likely to be misinterpreted by the tax officer, convince him or her of your bad faith and, as a result, prompt him or her to issue a much more onerous request for clarification marking the start of a genuine audit, which your tax lawyer can help you avoid.

Follow up on any request for justification or clarification

Issued on tax form 2172, these requests, sent by registered letter with acknowledgement of receipt, absolutely must be answered within 2 months. In the absence of a reply or in the event of an insufficient reply, the tax authorities are entitled to react and assess you ex officio, the penalty then generally amounting to 40% of the tax evaded. It is therefore recommended to reply within the time limits and to provide very clear and concise arguments and supporting documents demonstrating to the tax authorities the transparency of your situation.

Asking for the inspector's visit to be postponed in order to push the problems back in time: save in exceptional cases, a mistake

Panicked by the notice of audit you have just received, you decide to contact the tax authorities to ask for the date of the visit to be postponed? This reaction is generally a mistake. Indeed, tax inspectors may interpret this request for postponement as a sign of weakness on your part (a sign that you consider yourself "in hot water") and/or as heralding a potentially difficult audit in which the taxpayer will do everything possible to disrupt the smooth running of the procedure.

Save in exceptional cases, there is no point in putting off the problem; you will have to face reality in any case, and the sooner the better, as a rule.

Be polite and courteous

It is advisable to establish a cordial relationship with the auditor. Avoid any systematic challenging and do not put yourself in an adversarial position. In short, banish any trace of aggressiveness, at the risk of giving the impression that you are actually hiding something. In that case, the inspector tends to dig even deeper. So remember to make the inspector comfortable, taking care to choose a neutral room with no internal documents and no employees present in the case of a tax audit targeting a business.

Improvising: the risk of saying too much

Under the stress of a tax audit, some people start saying more than they are asked. Since anything you say may be used against you, it is advisable to answer only the questions asked by the auditor and to take time to think if you are not sure of the answer to give, or to turn to a tax lawyer to represent you before the tax authorities. In the case of a tax audit of a business, the company's manager should therefore make sure to brief employees before the inspector's visit so that they do not volunteer information on their own.

Tax officers are curious, which is a quality in their case, as it often allows them to gather new information to exploit. They very much like listening to you. Confine yourself to strictly answering the questions put to you; there is no need to add anything.

Seek the help of a tax lawyer

Of course, the assistance of an experienced professional, such as a tax lawyer, can prove very useful. Indeed, the lawyer can defend you in two ways:

  • On the merits: verification of the grounds invoked by the tax authorities. Are the tax authorities really entitled to reassess you? The tax lawyer will scrutinise the tax authorities' arguments and test them against the law.
  • On procedure: rigorous examination of the procedural rules governing the audit. This last point is particularly interesting given that certain procedural defects may result in the nullity of the tax audit carried out by the tax authorities. Here are a few examples of omissions giving rise to possible procedural defects:

Statement in the notification of the names of the auditor's hierarchical superiors

Statement in the notification that the audited taxpayer may be assisted by an adviser

Indication of the years subject to the audit

Obligation for the tax auditor to remind the taxpayer of his or her rights and to explain how the procedure will unfold

Adversarial debate

Limitation periods exceeded

No signature by the divisional manager where surcharges for bad faith are applied

And thousands of other possible failings in the event of non-compliance with certain texts specific to the taxpayer's situation...

Trying to impress the inspector: a very bad idea

Officers of the DGFIP (French Public Finances Directorate General) are keen to demonstrate the independence of their administration. Attempting a show of force by welcoming the auditor in the presence of a whole cohort of advisers and/or your closest colleagues is therefore likely to complicate the conduct of the tax audit and prompt the inspector to be even more meticulous. Keep it to a small group and let the inspector conduct the audit as freely as possible. You will have plenty of time to point out his or her errors later, once you have received the reassessment proposal.

Avoid obstructing the tax audit

Obstruction of a tax audit (opposition à contrôle fiscal) occurs when the audit could not take place because of the taxpayer. This is the case in particular when the taxpayer:

- Is absent on the date set for the start of the tax audit and remains absent for several months without any possibility of reaching him or her
- Refuses to provide the tax authorities with his or her accounts/supporting documents or provides very incomplete information
- Delays the resumption of an audit of accounts through delaying tactics

You should therefore make arrangements for the tax audit to proceed properly in order to avoid tax adjustments automatically increased by 100%. Yes, 100%!

Discuss with the tax authorities

Additional tax is being demanded following the tax audit? Instead of immediately considering going to court after a formal tax claim (réclamation contentieuse), you can opt for an amicable route to challenge the tax reassessment. This can take various forms:

Make an appointment with the departmental contact officer (interlocuteur départemental) or your auditor's hierarchy

Refer the matter to a specialised commission or committee with authority over a dispute between a taxpayer and the tax authorities: the Tax Abuse of Law Committee (comité de l'abus de droit fiscal), the departmental tax commission (commission départementale des impôts).

Make a hierarchical appeal (ask to meet the auditor's hierarchical superior, who is generally the head of the audit team). In practice, this appeal is quite effective. It makes it possible to discuss directly with the head of the department and to point out, face to face, the substantive and procedural shortcomings of the audit, as well as to explain the taxpayer's situation in a simple and direct manner.

Submit a request for leniency

This does not allow you to challenge the reassessments themselves, but it does allow you to ask the tax authorities for leniency on the surcharges.

Negotiate with the tax authorities: the settlement

In the case of fines and/or surcharges, a settlement (transaction) consists in negotiating with the tax authorities a reduction of the amount they are claiming from you, in return for your undertaking to pay the "bill" promptly and not to bring any proceedings.

Although the tax authorities are under no obligation to accept, they nonetheless relatively often agree to such negotiation in order to collect cash quickly and close the file as soon as possible.

Our tax law firm can assist you.

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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 !

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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.

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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

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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

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Google reviewJuly 2024

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Google reviewOctober 2024

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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

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Google reviewDecember 2023

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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.