Tax audit — Anticipation

Preparing for a tax audit:
anticipation, not reaction

The tax authorities no longer audit at random: they target through data analysis based on information already reported. For a structured company or significant personal assets, the question is no longer whether but when. A risk anticipated does not cost the same as a risk endured. This guide explains how a tax audit is prepared, and why that preparation is best handled by a lawyer.

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— In brief
Selection
Targeting through data analysis of tax returns
Statute of limitations
3 years (income tax/corporate tax), up to 10 years for foreign accounts (French Book of Tax Procedures art. L.169)
Voluntary correction
Late-payment interest reduced by 50% if spontaneous (French Tax Code art. 1727 V)
Endured vs anticipated
40% or 80% surcharge in the event of deliberate non-compliance (French Tax Code art. 1729)
Protection
Lawyer's professional secrecy (1971 Act, art. 66-5)
— 01

A tax audit is prepared for; it is not endured

The French tax administration (DGFiP) now selects a major share of its audits through data analysis, an automated cross-referencing of the information the taxpayer has themselves reported: the accounting-entries file, statutory tax filings, income and wealth returns, and data from the international exchange of information. Inconsistency can no longer be hidden: it is computed.

The corollary is simple. What the tax authorities can compute, the taxpayer can compute before them. And the cost gap between the two situations is considerable: a risk corrected voluntarily bears late-payment interest reduced by half (French Tax Code art. 1727 V) and no surcharge; the same risk discovered by an auditor comes with a 40% surcharge, sometimes 80% (French Tax Code art. 1729), and interest at the full rate.

Preparing for a tax audit is therefore not about hoping to escape it. It is about knowing your exposure early enough to address it under the most favourable conditions the law provides: voluntary correction, the express mention (French Tax Code art. 1727 II), preventive documentation, the advance ruling.

— 02

Five levers to anticipate a tax audit

Preparing for a tax audit means acting on five fronts before the tax authorities take it up.

1. Map the red zones

Shareholder current accounts, management fees, intra-group agreements, VAT on mixed activities, international matters, real estate wealth tax (IFI): the areas an auditor examines first. The map precedes the remedy.

2. Quantify the risk, do not guess it

Every weakness must be quantified and tied to its legal basis: Tax Code, official tax guidelines (BOFiP), case law. A vague point of attention supports no decision.

3. Voluntarily correct what needs correcting

Amended returns, interest reduced by half (French Tax Code art. 1727 V), no surcharge. The arithmetic is decisive against a reassessment endured.

4. Document and secure

Written and dated agreements, a remuneration policy, documented transfer pricing, an advance ruling on uncertain points: turning a grey area into an unassailable position.

5. Do it under the protection of professional secrecy

The report listing your weaknesses, if conducted by a lawyer, is covered by professional secrecy: the tax authorities cannot require its disclosure. An audit conducted by a third party, by contrast, leaves a record that can be used against you.

— 03

Our approach at the firm

The firm defends taxpayers facing the DGFiP: companies, directors, high-net-worth individuals. This litigation practice feeds one conviction: most heavy reassessments are decided before the audit, in the quality of the case preparation.

That is why the firm designed The Mock Audit: a full simulation of a tax audit, run on your file with the same lines of inquiry, the same texts and the same figures as an auditor, ahead of the tax authorities. The report, covered by professional secrecy, lists the quantified heads of reassessment and the prioritised action plan to neutralise them.

— Frequently asked questions

Anticipating a tax audit

Can a tax audit really be anticipated?

Yes. Since the tax authorities target on data already reported, that same data can be analysed upstream, along the same lines as an auditor. This is the purpose of a tax-audit simulation: knowing your exposure before it is discovered.

Is voluntary correction advantageous?

Clearly. Voluntary correction gives entitlement to a 50% reduction in late-payment interest (French Tax Code art. 1727 V) and avoids any surcharge. The same risk discovered during an audit, by contrast, bears a 40% surcharge, or even 80% in the event of manoeuvres (French Tax Code art. 1729).

Why prepare this with a lawyer rather than another adviser?

For professional secrecy (Act of 31 December 1971, art. 66-5). The report listing your weaknesses, conducted by a lawyer, is covered by secrecy: it cannot be seized, save for the case, foreign to a preventive audit, of a document used to commit fraud (French Code of Criminal Procedure art. 56-1-2). Conducted by a third party, it may on the contrary be disclosed or seized: you would then have created yourself the very document liable to be used against you.

For how long can the tax authorities go back?

The ordinary statute of limitations is three years for income tax and corporate tax (French Book of Tax Procedures art. L.169). It is extended to ten years notably for hidden activities, undeclared foreign assets or, since the 2025 Finance Act, false tax residency abroad. Wealth tax (IFI) and registration duties are subject to a separate six-year period (art. L.186).

In practice, where should one start?

With a quantified mapping of your red zones. For this the firm offers The Mock Audit, a tax-audit simulation conducted by a lawyer and presented in a meeting. A preliminary consultation allows its relevance to be assessed.

Cité par

Know your exposure, ahead of the tax authorities

The Mock Audit: a tax-audit simulation conducted by a lawyer, under the protection of professional secrecy. The firm accepts a limited number of matters each month.

Request a preliminary consultation View the tax-audit practice

© BENSAID Avocats — The information on this site does not constitute legal advice and cannot replace a personalised analysis. Sources: French Tax Code art. 1727 (late-payment interest; II express mention; V voluntary correction), art. 1729 (surcharges); French Book of Tax Procedures art. L.169 and L.186 (statute of limitations); Act no. 71-1130 of 31 December 1971, art. 66-5 (professional secrecy); French Code of Criminal Procedure art. 56-1-2. Editorial update: July 2026.