France has entered a new era of tax enforcement. Gone are the days when audits were based on manual selection and the intuition of experienced inspectors. Today, the detection of tax fraud relies on powerful technological tools, capable of cross-checking massive amounts of data and uncovering signals invisible to the human eye.

The November 2023 report by the French Cour des comptes (Court of Auditors) provides a striking analysis of this transformation. According to the report, France has shifted from a traditional model of auditing wealthy taxpayers every three years to a strategy centered on data-mining and artificial intelligence. The French Tax Administration (DGFiP) now relies on a vast “data lake” consolidating fiscal, banking, real estate, and social data, enriched by international transparency frameworks such as CRS, FATCA, and DAC6.

These databases feed predictive algorithms that assign risk scores to taxpayers. In 2022, this system generated 155,000 audit proposals, three times more than in 2018. Tax audits are no longer the result of chance, but of algorithmic selection on an unprecedented scale.

Intensification without clear measurement

The results are undeniable. In 2022, the DGFiP notified €14.6 billion in reassessments, nearly one-fifth of which came from individuals. By 2024, this figure reached an all-time high of €16.7 billion, with over 2,000 cases referred to criminal prosecutors. The boundary between administrative adjustments and judicial proceedings is becoming increasingly blurred.

Yet the Cour des comptes points to a paradox: while detection has intensified, the overall scale of tax fraud among individuals remains poorly measured. Estimates range from €7 billion to €27 billion per year, a gap too wide to properly assess the impact of the new digital strategy. The report recommends establishing a robust methodology to quantify this tax gap by 2027.

New frontiers: crypto, residency, and real estate

Beyond the numbers, the report identifies the risk areas most targeted by the DGFiP. Foreign bank accounts are a prime example. Thanks to CRS and FATCA, France automatically receives banking data from more than 80 jurisdictions. The omission of even a dormant account can trigger significant fines and surcharges.

Crypto-assets are another priority. Since 2019, French residents must declare their digital wallets. The DGFiP now uses blockchain analysis tools to compare flows with declared income. This emerging field has become a cornerstone of wealth audits.

Tax residency is also under close scrutiny. Taxpayers who claim non-residency while maintaining ties in France—such as a home, professional activity, or family—risk full reassessment. Since February 2025, the statute of limitations has been extended to 10 years for false residency cases.

Real estate remains a classic focus, but with modern tools. Cross-checking cadastral and notarial records, combined with aerial imagery, allows the detection of undeclared properties or extensions. The French tax administration is using increasingly intrusive yet legally grounded technologies.

Safeguards and criticisms

While the Cour des comptes validates the efficiency of the new strategy, it stresses the importance of legal safeguards. The expansion of detection powers must remain proportionate and respect individual rights. Monitoring of social media, for instance, is restricted to public content, and all data processing must comply with GDPR.

The report sets out six recommendations: more transparency in audit selection, better measurement of fraud, improved coordination between detection, audit and recovery through the PILAT project, the development of a true fiscal intelligence unit, proactive alerts during online declarations, and retention of specialized staff trained in digital detection.

Anticipation as the best defense

For high-net-worth individuals, expatriates, and non-residents with assets in France, the message is clear: audit risk has never been higher. With the tools now available to the DGFiP, opacity is no longer an option. The real question is not whether an audit will occur, but when and on what grounds.

The best strategy is therefore proactive. Taxpayers should ensure that declared residency aligns with reality, that all foreign accounts and digital assets are disclosed, that IFI valuations are backed by solid appraisals, and that full documentation is kept for their wealth and transactions. Anticipation reduces risk, but it also demonstrates good faith—a factor that can influence the outcome of disputes.

Conclusion: The age of imposed transparency

The Cour des comptes report leaves little doubt: France has shifted from selective, artisanal audits to mass surveillance powered by algorithms and global data exchange. Individuals are now at the center of this enforcement strategy. This calls for a change in behavior—not just to comply with the law, but to protect wealth and reputation against increasingly aggressive proceedings.

At Qualifisc, we assist our clients in navigating this new landscape: preventive risk assessments, wealth structuring, audit preparation, and defense in case of reassessment.

Contact us today for a confidential consultation. In France, the best defense against data-driven tax audits is anticipation.