Article 4B CGI: Defining Residency
Tax residence determines which state has the primary right to tax an individual's worldwide income. Under article 4B CGI, a person becomes a French tax resident if they satisfy any one of three criteria, or if they are a French state agent posted abroad. Correctly identifying residency is essential for tax planning, expatriation, repatriation, and resolving conflicting claims between states.
1. The Three Criteria of Article 4B
Criterion A: Home or principal place of abode in France: Your permanent home, whether owned or rented, where you and your family typically reside. Quality of the residence matters; temporary accommodation does not establish residency under this criterion. The factual pattern of your presence in France, considering frequency, duration, and continuity of stays is also examined here.
Criterion B: Professional activity in France: Engagement in professional activity in France, whether salaried or self-employed, unless the activity is merely ancillary or supplementary to activities conducted elsewhere.
Criterion C: Centre of economic interests in France (domestic law): Under article 4B, 1, c) CGI, this criterion focuses specifically on where your principal economic activities and investments are located—professional operations, business premises, and economic ties. This is distinct from the treaty law concept of "centre of vital interests," which encompasses personal and economic relations (family, work, social ties). Both are relevant to residency determination, but under different legal frameworks.
State agent exception (Article 4B, 2 CGI): Separately from the three main criteria, French government agents posted abroad who do not pay personal income tax in the country of posting are presumed to be French residents. This is not a "criterion" but a special statutory provision that establishes residency regardless of whether the three criteria are satisfied.
Principal place of abode and the 183-day threshold: Article 4B, 1, a) CGI refers to "foyer ou lieu du séjour principal"—the principal place of abode. This is assessed qualitatively, examining where your home and habitual residence are located. While the number of days spent in France is a relevant factor in this assessment, there is no autonomous 183-day rule in domestic French law. The 183-day threshold appears in certain tax treaties as a tie-breaker criterion, but domestic law requires a substantive examination of the permanence and reality of your residence in France.
2. Burden of Proof & Documentation
The tax administration must establish residency under at least one criterion of article 4B CGI. In practice, the taxpayer bears the burden of demonstrating a genuine transfer of residence when contesting an assessment. This requires documentary evidence (foreign property lease, employment contract, family relocation records, reduced France presence) that collectively proves the criteria are no longer satisfied. Maintaining detailed records of housing, employment, family location, and administrative ties is essential to substantiate your position.
3. Treaty Tie-Breaker Rules & the 2025 Treaty-Based Limitation
When two states claim residency of the same individual (conflicting residency), bilateral tax treaties include systematic tie-breaker rules. The standard protocol: (i) permanent home, (ii) centre of vital interests, (iii) habitual abode, (iv) nationality, (v) mutual agreement by the states. Identifying the applicable treaty and applying its tie-breaker is critical.
Wording in force since 16 February 2025: under Article 83 of Law no. 2025-127 of 14 February 2025, Article 4 B CGI now 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 statutory articulation confirms the interaction between domestic criteria and treaty provisions in the text of the CGI itself, but remains subject to the taxpayer's concrete showing, on the facts, that he or she qualifies as resident of the other contracting State within the meaning of the applicable treaty.
Example scenario: You own a home in France but live most of the year in Switzerland with your family and operate your business there. Switzerland's centre of vital interests test (family + work) may prevail over France's habitual abode claim, making the treaty tie-breaker determinative.