Tax audit for French companies 2026: how to prepare

A tax audit in France is never a random event, and it cannot be handled effectively at short notice. The French tax authority (Direction générale des finances publiques, DGFiP) selects files based on consistency indicators and risk criteria refined each year through increasingly automated analysis. A well-prepared company can navigate the process cleanly. A company caught unprepared may face tens of thousands of euros in additional taxes, interest, and penalties.

In 2026, two developments stand out: the DGFiP's intensified automated analysis of the FEC (Fichier des Écritures Comptables — the mandatory standardised accounting file), and the progressive adoption of the Examen de Conformité Fiscale (ECF), a contractual compliance audit that provides significant legal protection for companies that act before any procedure is opened.

Short answer: A French tax audit can generally look back 3 years under the standard rules, 6 years in the case of undeclared foreign accounts or concealed activity, and up to 10 years for serious fraud. Prepare your FEC, gather supporting documents, and involve your expert-comptable from the moment you receive notice. The ECF compliance review can neutralise penalties and late-payment interest on validated items.

French tax law (Livre des procédures fiscales, LPF) provides the administration with several audit tools. Knowing which procedure has been opened determines the appropriate response.

The desk review is the most common. It is based on filed returns and information the administration already holds. It typically leads to a targeted information request or a proposed adjustment.

The remote accounting audit (introduced by art. L13 G LPF) is conducted entirely at a distance. The company transmits its FEC within 15 days of request. The administration processes it with automated tools. This procedure is increasingly used for SMEs.

The on-site inspection (vérification de comptabilité) is the most thorough procedure. An inspector visits the company premises, reviews all accounting records on site, and interviews management directly. For SMEs whose turnover does not exceed the thresholds for the simplified real tax regime, on-site interventions are capped at 3 months (art. L52 LPF).

This question arises in virtually every preparation file. The answer depends on the company's situation.

Practical example: for the 2024 financial year, the standard reprise period runs until 31 December 2027. The administration may issue a proposed adjustment up to that date.

One frequently overlooked point: the administration may examine a time-barred year if it has a direct impact on a year still within the reprise period. This applies notably to carried-forward tax losses: a loss recorded in 2021 and offset against 2024 profits may be challenged even though the 2021 year is technically time-barred.

Documentary preparation determines both the smoothness of the procedure and the strength of the positions defended.

The FEC is the central element. Any company keeping its accounting on a computerised system must be able to produce it in a normalised format upon request (art. L47 A I LPF). A non-compliant FEC exposes the company to a financial penalty and, in the most serious cases, to outright rejection of the accounts and assessment by the administration on a substituted basis.

Key conformity checks to carry out in advance: correct column format, integrity of sequence numbers, balanced entries, presence of all required journals, and consistency with the filed tax return.

Beyond the FEC, the inspector will examine supporting invoices (suppliers and clients), contracts, bank statements, minutes of shareholder meetings, depreciation schedules, shareholders' current account agreements, and, where applicable, notes to the annual accounts.

Cross-consistency between documents is closely scrutinised: a sharp and unexplained increase in a cost line, cash flow inconsistent with the level of activity, or untraceable transfers between accounts — these are all signals that direct the inspector's attention.

The taxpayer subject to an audit has substantial rights, enforceable against the administration.

The Taxpayer's Charter (Charte des droits et obligations du contribuable vérifié) must be handed to you before the audit begins. It details your rights and the administration's obligations. Failure to receive it constitutes a procedural irregularity that can invalidate the entire procedure.

The 3-month on-site cap (art. L52 LPF): for SMEs below the simplified real tax regime thresholds, on-site interventions cannot exceed 3 months in duration. Any excess renders the procedure irregular.

The right to professional assistance: you may be accompanied by your expert-comptable, a tax lawyer, or any adviser of your choice at every stage of the procedure. This is a fundamental guarantee. A firm experienced in audit procedures helps secure the positions argued, avoids responses that inadvertently concede ground, and ensures all reply deadlines are met without pressure.

The adversarial procedure: any proposed adjustment must be notified to you in writing, with full reasons, and must allow a response period of at least 30 days (extendable to 60 days upon request). You may accept, reject, or submit reasoned observations. The administration must then reply point by point before maintaining or withdrawing the adjustments.

The ECF, established by decree n° 2021-25 of 13 January 2021, is a contractual audit carried out by an expert-comptable, a statutory auditor (commissaire aux comptes), or an approved management body (organisme de gestion agréé). Its purpose is to validate, on 10 specific points, the company's tax compliance before any potential audit is opened.

The mission report is electronically transmitted to the DGFiP.

Practical benefits: if the administration raises an adjustment on a point that was validated by the ECF provider, the company may obtain reimbursement of the corresponding portion of the audit fee. More importantly, where the company has acted in good faith and followed the recommendations made, the DGFiP commits to applying no penalties and no late-payment interest on the relevant adjustment.

The ECF does not guarantee the absence of an audit, but it substantially reduces the cost of any potential adjustment and formally documents the company's good faith.

To put the financial stakes in concrete terms, here is a scenario representative of files we handle at the audit stage.

Situation: an SME is subject to an on-site vérification de comptabilité covering 3 financial years. The inspector identifies two issues: expenses deducted without adequate supporting documentation, and input VAT claimed on mixed-use expenditure that was not correctly apportioned. Total additional tax assessed (corporate tax and VAT combined): €30,000.

Without preparation or ECF:

• Additional tax: €30,000
• Late-payment interest: 0.20% per month (art. 1727 CGI), over an average of 18 months → approximately €1,080
• Penalty for deliberate breach (40%, art. 1729 CGI): €12,000
• Total payable: approximately €43,080

With sound preparation and an ECF covering the relevant points:

• Proper documentation would have allowed the charges deduction to be defended or reduced
• The ECF points covering exceptional charges (point 9) and VAT chargeability (point 10) would have neutralised penalties and late-payment interest on the corresponding adjustments
• Potential saving: several thousand euros in penalties, and the deliberate-breach characterisation avoided through documented good faith

Our view: in the majority of adjustment cases we assist with, the amounts at stake do not arise from complex arrangements. They arise from documentary gaps or poorly secured treatments on routine items — depreciation, VAT on mixed-use assets, exceptional charges. These are precisely the points the ECF audits.

Effective preparation follows four distinct steps, ideally initiated outside any open procedure.

1. FEC and accounting audit — technical conformity check of the FEC, detection of sequence anomalies, consistency check between accounting balances and filed returns.

2. Review of risk areas — analysis of items that recur in adjustments: mixed-use expenses, passenger vehicles, entertainment costs, provisions, shareholders' current account agreements, input VAT on fixed assets.

3. Assembly and organisation of supporting documents — classification by year and by nature, with traceability of decisions taken (signed minutes, approved expense claims, dated contracts).

4. Assistance throughout the procedure — presence of the firm at meetings with the inspector, drafting of responses to proposed adjustments, deadline management, and appeals strategy if required.

The same weaknesses appear repeatedly in the audit files we handle:

Responding without reading the proposed adjustment in full. Individual items may appear minor in isolation. Read together, they reveal the inspector's line of argument — which must be identified before submitting observations.

Confusing the response deadline with appeals deadlines. The deadline to respond to a proposed adjustment (30 days, extendable to 60) is not the same as the deadlines for hierarchical appeal or referral to the tax commission. Confusing them forfeits irreplaceable procedural rights.

Failing to formalise intragroup or current account agreements before the audit. An undocumented shareholders' current account, or interest paid above the statutory ceiling, are routine targets for inspectors.

Underestimating the FEC. A FEC produced hastily, with unexplained balancing entries or gaps in numbering sequences, immediately directs the inspector toward the affected years.

Not activating the ECF before a procedure is opened. The ECF can be subscribed at any point before an audit notification is issued. Once a procedure has been formally opened, it no longer produces its protective effects.

This article is provided for information purposes and updated as of 26 May 2026. It does not replace a personalised analysis of your specific situation, documents, and applicable law. Consult an expert-comptable or tax lawyer before making decisions that engage your company.