Article 4 B of the French Tax Code establishes the legal framework for determining tax residency status for individuals under French domestic tax law, a determination of paramount importance as it triggers universal worldwide-source income taxation for those qualifying as French tax residents. Tax residence constitutes a foundational concept in tax administration, as it demarcates those individuals subject to complete French tax jurisdiction from those subject to French taxation only on French-source income. Understanding the three principal criteria established by Article 4 B CGI, as well as the treaty-based limitation introduced by the 2025 Finance Law, proves essential for individuals contemplating relocation abroad, business executives managing multi-country operations, and taxpayers seeking to structure affairs optimally within permissible tax law constraints.

The Three Principal Criteria of Article 4 B CGI

Article 4 B of the French Tax Code establishes that an individual is deemed to be a French tax resident if at least one of three principal alternative criteria is satisfied: (1) the individual's home (foyer) or principal place of abode (lieu de séjour principal) is in France; (2) the individual carries on a professional activity in France, whether salaried or not, unless the activity is ancillary; or (3) the individual's centre of economic interests is in France. Additionally, Article 4 B, 2 provides that an agent of the French State exercising functions abroad and not subject to personal income tax in the country of posting is deemed a French tax resident — this is a separate, autonomous provision. The three principal criteria are alternative, not cumulative — satisfaction of any single criterion suffices to establish French tax residence. This disjunctive formulation means that breaking the tax residence link requires affirmative action on all applicable criteria simultaneously. In its wording in force since 16 February 2025, resulting from Article 83 of Law no. 2025-127 of 14 February 2025, Article 4 B CGI expressly provides that persons satisfying one of the domestic criteria "cannot, however, be regarded as having their tax domicile in France where, under the international conventions relating to double taxation, they are not regarded as residents of France". This treaty-based articulation enshrines in the text of the CGI the interaction between domestic criteria and treaty provisions, while remaining subject to the taxpayer's concrete demonstration, on the facts, that he or she qualifies as resident of the other contracting State within the meaning of the applicable treaty.

Criterion 1: Home or household in France

The household criterion under Article 4 B CGI refers to the place where the taxpayer or the taxpayer's family normally lives. It is not satisfied merely because the taxpayer owns or can use a second home, holiday property or pied-à-terre in France. A French property may be relevant evidence, but the analysis turns on habitual residence, family location and actual personal circumstances, not on ownership alone.

The domestic French notion of foyer must also be distinguished from the treaty notion of a permanent home. A retained French property may become relevant in a treaty tie-breaker analysis only after dual residence has first been established under the domestic laws of the two States concerned. Ownership or availability of accommodation is therefore not, by itself, sufficient to establish French tax residence under Article 4 B; it must be assessed together with family residence, actual stays, professional activity, economic interests and the applicable treaty.

Criterion 3: Centre of Economic Interests in France

Under Article 4 B, 1, c) CGI, the "centre of economic interests" (centre des intérêts économiques) is a domestic law concept that focuses specifically on where the taxpayer's principal investments, business headquarters, and income sources are located. This criterion differs from the broader "centre of vital interests" concept found in tax treaties (OECD Model Article 4, section 2), which serves as a tie-breaker in dual-residence situations and encompasses both personal and economic relations.

The centre of economic interests analysis under Article 4 B requires qualitative assessment of where the taxpayer's principal economic resources and professional activity centre. Courts have examined factors including: location of principal business operations and professional headquarters; location of major investment holdings and capital; location of principal professional client concentrations; and general concentration of income-generating activity. An individual with modest real estate holdings but principal business headquarters and income sources in France will typically satisfy the centre of economic interests criterion despite substantial asset values abroad. Conversely, an individual with a business headquarters and principal economic operations abroad will typically not satisfy this criterion based on investment holdings in France alone.

Criterion 2: Principal Place of Abode in France

Under Article 4 B, 1, a) CGI, the criterion of "principal place of abode" (lieu de séjour principal) refers to a qualitative assessment of where the individual's habitual residence centre is located. The number of days spent in a country is a relevant factor in this assessment but does not constitute an autonomous, mechanical threshold. The 183-day rule does not exist as an autonomous domestic French tax-residence test under Article 4 B. A day-count may be relevant as factual evidence of the principal place of abode, and 183-day tests appear in certain treaty provisions, especially for employment income, but the OECD-style residence tie-breaker is based on permanent home, centre of vital interests, habitual abode, nationality and, if necessary, mutual agreement rather than on a mechanical 183-day threshold.

Under Article 4 B domestic law, a taxpayer spending more time in France than in any other single country may be deemed to have their principal place of abode in France, even if that time falls significantly below 183 days. Conversely, exceeding 183 days in France does not automatically establish principal place of abode there if the individual's home (foyer) is clearly established abroad. The analysis examines objective facts of residence (accommodation stability, family presence, employment location, social integration) rather than subjective intent. An individual intending non-residence but physically present more than 183 days due to business exigencies may nonetheless be found to have principal place of abode in France, depending on the quality and nature of that presence.

Dual Residence: Tax Treaty Resolution Mechanisms and the Treaty-Based Limitation

Situations frequently arise where individuals satisfy the Article 4 B criteria for tax residence in France while also satisfying tax residence criteria in another country under that country's domestic law. In such dual-residence scenarios, the analysis must first consider whether an applicable bilateral tax treaty between France and the other country provides an exclusive allocation of residence. Tax treaties contain hierarchized tie-breaker criteria designed to assign exclusive tax residence to one country, applied in strict hierarchical order: (1) permanent home availability; (2) centre of vital interests; (3) habitual abode; (4) nationality. The treaty concept of "centre of vital interests" at section 2 of Article 4 of the OECD Model is broader than the domestic law concept of "centre of economic interests" — it encompasses personal relationships (family, social ties) alongside economic connections.

Critically, since the Loi de finances pour 2025, a treaty-based limitation now forms an explicit part of Article 4 B CGI itself: a person meeting a domestic French residence criterion cannot be regarded as tax-domiciled in France where, under an applicable double-tax treaty, that person is not regarded as a resident of France. This does not eliminate the need for a factual domestic-law analysis; it requires applying domestic criteria first, then the treaty tie-breaker where a genuine dual-residence conflict exists.

If none of the treaty tie-breaker criteria resolves the dual-residence conflict definitively, the competent authorities of the two countries may settle the question by mutual agreement under the treaty's mutual agreement procedure — but this is a last-resort mechanism, not an autonomous criterion.

Individuals in dual-residence situations should consult a tax specialist regarding applicable treaty provisions, as treaty treatment may differ substantially from domestic law rules and the treaty-based limitation may alter the final residence outcome.

Burden of Proof and Factual Assessment

Article 4 B CGI establishes an objective framework for determining tax residence based on factual circumstances. The tax administration bears the burden of establishing that at least one of the three principal criteria (or the state agent provision) is satisfied through examination of objective facts. However, a taxpayer challenging a residence determination by the administration bears the practical burden of demonstrating, through documentary evidence, that genuine transfer of residence has occurred. This evidentiary burden requires showing cessation of the applicable criteria through concrete facts: lease termination or property sale (permanent home); employment contract and relocation documentation (professional activity centre); business registration and client redirection (economic interests centre); family relocation documents (personal and family centre); utility bills and residential registration in the new country (habitual residence).

This burden allocation proves consequential for individuals declaring changed residence status to French authorities, as inadequate documentary support for residence change claims may result in administration rejection and continued residence determination. The analysis is inherently factual and case-specific, requiring evaluation of the quality and coherence of evidence demonstrating true severance of all applicable ties to France.

Documentation Supporting Residence Change Claims

Individuals claiming cessation of French tax residence should compile and maintain comprehensive documentation establishing satisfaction of changed residence status:

This documentation should be retained and made available to French authorities upon request, as deficient evidence may result in residence determination disputes.

Exit Tax Coordination with Residence Determination

Determination of the precise date of French tax residence cessation carries critical importance for exit tax calculation, as exit tax applies to latent gains existing at the date of cessation of tax residence. Disputes regarding the effective residence cessation date directly affect exit tax base calculations. Consequently, individuals planning expatriation should contemporaneously document the residence change date by notifying relevant tax authorities and retaining documentation evidencing the moment when all three principal Article 4 B criteria, and the state agent provision if applicable, have ceased to be satisfied. The date of residence change should be established through contemporaneous notification to the French tax administration and supporting evidence of severance of French residence connections.