French Labour Law

URSSAF Audit in France: A Practical Guide for Employers

DAIRIA Law · 2026-08-11 · 4 min

URSSAF Audit in France: A Practical Guide for Employers

The URSSAF audit is a critical milestone for employers, ensuring your company’s compliance with social-security contribution obligations. URSSAF (Union de Recouvrement des cotisations de Sécurité Sociale et d’Allocations Familiales — the body that collects social-security and family-allowance contributions in France) conducts these audits. Understanding the audit process, the assessment methods and the available remedies is essential to anticipate and effectively manage this obligation. Here is how it works, from initiation to challenge.

What is a URSSAF audit?

The purpose of a URSSAF audit is to verify all contributions owed by companies. It seeks to ensure the correct application of social-security legislation by checking the bases and rates applied to various contributions (social security, pensions, unemployment insurance, etc.). Companies of all legal forms may be subject to such an audit, with the exception of the central administrations of the French State.

How a URSSAF audit unfolds

1. Notice of audit

Before beginning any verification, URSSAF must send you a notice of audit (avis de contrôle), in accordance with Article R.243-59 of the French Social Security Code. This notice must state the start date of the audit, the points to be verified and the period concerned.

2. The audited period and the limitation period

The audit period is generally 3 years, but it may be extended where irregularities are found. Once this period has elapsed, URSSAF is no longer entitled to claim earlier contributions. It is crucial to check that the period referred to in the notice of audit complies with this legal framework.

3. The verification

URSSAF may carry out different types of verification:

  • Actual verification (vérification réelle): based on accounting records and contribution statements.
  • Sampling and extrapolation (échantillonnage-extrapolation): a method used to generalise conclusions drawn from a sample of the items reviewed.
  • Flat-rate assessment (taxation forfaitaire): where the information provided is insufficient or doubtful, URSSAF may estimate the amount of contributions on a flat-rate basis.

4. Letter of observations

Following the verifications, URSSAF sends you a letter of observations (lettre d’observations). This document sets out the instances of non-compliance identified and gives you the opportunity to respond before the audit results are finalised. You are allowed a set period to provide your reply.

Key points to watch during an audit

1. The adversarial period

During this phase (période contradictoire — the adversarial exchange stage), your company may challenge URSSAF’s observations. It is essential to prepare your defence with solid supporting documents. Neglecting this stage can lead to automatic reassessments.

2. Formal notice and enforcement order

If URSSAF maintains its position after the adversarial period, it may issue a formal notice (mise en demeure). If this formal notice goes unanswered, an enforcement order (contrainte) may be used to compel recovery of the amounts due. This underlines the importance of respecting deadlines and responding proactively.

3. Challenge and remedies

If you disagree with URSSAF’s conclusions, several avenues of appeal are available to you, such as an action before the judicial court (tribunal judiciaire — social division). You may also consider negotiation or a settlement to reduce the financial consequences.

Surcharges and penalties

In the event of a reassessment, URSSAF may apply surcharges and penalties, in particular in cases of bad faith or failure to disclose undeclared work (travail dissimulé). These charges can significantly increase the total cost of the contributions owed.

It is therefore essential that you keep your documentation up to date and train your staff on compliance with social-security legislation. Rigorous monitoring can help avoid later complications.

Frequently asked questions

Which companies may be audited by URSSAF?

All companies and legal entities may be audited, with the exception of the central administrations of the French State.

What is a letter of observations?

It is a document sent by URSSAF after an audit, listing the potential irregularities. The company has the opportunity to respond to it.

What are the deadlines for challenging the observations?

You generally have a period of 30 days to respond to the letter of observations.

What should you do if you receive a formal notice?

Respond promptly and formally to URSSAF. You may challenge the formal notice and consider an appeal or a settlement.

What remedies are available if you disagree with URSSAF?

You may bring an action before the judicial court (tribunal judiciaire) or pursue a negotiation with a view to reaching a settlement.

Conclusion

Anticipating a URSSAF audit allows you to manage it more effectively. Ensuring the compliance of your contributions and understanding the procedures can help prevent heavy financial consequences. Do not hesitate to call on experts to strengthen your defence during these procedures. DAIRIA Law is at your disposal to assist you in managing these critical issues.

📌 This article is part of the complete guide URSSAF Audit: The Employer’s Guide.