France Tax Residency: The Four Tests Under Article 4B CGI

French Tax Residency: The Concept of Domicile Fiscal

France uses the concept of "domicile fiscal" (fiscal domicile) rather than "tax residence" to determine which individuals are subject to French income tax (impôt sur le revenu) on their worldwide income. The rules are set out in Article 4A and Article 4B of the Code Général des Impôts (CGI).

Article 4A establishes the basic principle: persons with their fiscal domicile in France are liable to French income tax on their worldwide income. Persons without French fiscal domicile are taxed only on French-source income.

Article 4B defines fiscal domicile by reference to four independent tests. Unlike the UK's Statutory Residence Test — which requires a weighing of multiple factors — French fiscal domicile is established by satisfying any one of the four tests. The tests operate as independent and alternative criteria. Once any one test is met, French fiscal domicile is established for that year.

This structure is broader than the UK's approach and significantly broader than Germany's, which relies primarily on the concepts of Wohnsitz (home/domicile) and gewöhnlicher Aufenthalt (habitual residence) under section 1 of the Einkommensteuergesetz.

The Four Tests

Test 1: Foyer (Home)

An individual has their fiscal domicile in France if their foyer — the household or family home — is in France. The foyer is the principal fixed abode of the individual and their family (spouse, children). It is the place where the individual normally lives with their family, the place they return to between periods of absence.

The foyer test is not primarily about physical presence. An individual who works abroad for most of the year but whose family home (and spouse and children) is in France will be treated as having their foyer in France. French courts have consistently held that the foyer is the place of habitual family life, regardless of where the individual physically spends the majority of their time.

This test catches many internationally mobile professionals who maintain a family home in France while working abroad. An executive with a Paris apartment where their spouse and children live, who spends most of the year on international assignments, is likely to be French fiscally domiciled under the foyer test.

Test 2: Séjour Principal (Principal Place of Stay)

In the absence of a foyer (for individuals without a stable family home, such as single individuals or those separated from their families), French fiscal domicile is established if France is the place where the individual spends the majority of their time.

Unlike the UK's 183-day bright line, France's séjour principal test is relative, not absolute. It asks whether the individual spends more time in France than in any other single country. An individual who spends 100 days in France, 80 days in the UK, and 70 days in Germany, with the remaining days spread across various countries, would have their séjour principal in France — even though they spent only 100 days there.

This relative comparison creates particular risk for individuals who are genuinely mobile across multiple jurisdictions. If no single foreign country accounts for more days than France, France wins the séjour principal test.

Test 3: Activité Professionnelle (Professional Activity)

An individual has French fiscal domicile if their principal professional activity is exercised in France. "Principal" is determined by the activity that occupies the most time, or, if time is approximately equal across countries, the activity that generates the most income.

An employee who works in France five days a week but also performs limited work in Belgium and the Netherlands has their principal professional activity in France. An entrepreneur who manages their business remotely from France, with the business's headquarters abroad, may have their principal professional activity in France depending on the substance of their French management role.

The professional activity test is particularly significant for digital entrepreneurs and remote workers. A person who conducts all their business activity via a laptop in their French home is performing their professional activity principally in France, regardless of where their company is incorporated.

Test 4: Centre des Intérêts Économiques (Centre of Economic Interests)

The fourth and often most complex test asks whether France is the centre of the individual's economic interests. This means the country where the individual has made their principal investments, where they hold the majority of their assets, where they have the most significant business stakes, or from which they derive the majority of their income.

The centre of economic interests test can establish French fiscal domicile for an individual who lives abroad and does not work in France, if their primary wealth — a French business, a portfolio of French property, French-sited investment accounts — is located in France.

How the Four Tests Interact

The four tests are hierarchical only in the sense that Test 1 and Test 2 are alternative formulations of a similar concept (habitual residence), while Tests 3 and 4 are independent additional bases. In practice, if an individual fails Test 1 (no stable family home anywhere), Test 2 operates as the primary residence criterion. Tests 3 and 4 catch individuals who might argue they lack habitual residence in France but whose professional and economic life is centred there.

Test	What It Measures	One-Test-Sufficient Rule
Foyer	Location of family home	Yes — any test alone is sufficient
Séjour principal	Relative time in France vs other countries	Yes
Activité professionnelle	Location of main work activity	Yes
Centre des intérêts économiques	Location of main investments/income	Yes

Treaty Override: When France Is Not the Exclusive Taxing Authority

Where an individual is a dual resident — meeting the French fiscal domicile tests and the residence tests of another country simultaneously — the applicable double tax treaty will contain a tiebreaker provision (Article 4 of the OECD Model) that determines which country has primary residence rights.

Under the OECD Model tiebreaker, dual residence is resolved by examining in sequence: permanent home, centre of vital interests, habitual abode, nationality. The treaty tiebreaker overrides domestic law — a person who is technically French fiscally domiciled under Article 4B CGI, but who is allocated to the other treaty state under the tiebreaker, is treated as non-resident in France for treaty purposes.

However, treaty tiebreakers have limits. France takes an aggressive position on the scope of its treaty obligations. The Conseil d'État has held in multiple cases that fiscal domicile established under Article 4B CGI continues to operate for taxes not covered by the treaty (such as local taxes and certain social charges), even where the tiebreaker allocates primary residence rights to the other state.

Social Charges: The Hidden Additional Cost

French fiscal domicile triggers not only income tax (maximum marginal rate 45%) but also social charges (prélèvements sociaux) on income from capital. The combined social charge rate on capital income is 17.2%, composed of:

• CSG (Contribution Sociale Généralisée): 9.2%
• CRDS (Contribution au Remboursement de la Dette Sociale): 0.5%
• Prélèvement de solidarité: 7.5%

Social charges on capital income are payable by French fiscally domiciled individuals in addition to income tax, meaning the effective French rate on investment income can reach 62.2% (45% income tax + 17.2% social charges) for high earners.

The ECJ ruled in Ruyter v Caisse de Sécurité Sociale (Case C-623/13) that social charges cannot be applied to EU nationals who are affiliated to a social security system in another EU member state. For EU residents receiving French-source investment income, this ruling may reduce the social charge exposure — but it does not apply to French fiscal domiciliaries.

Practical Advice for Individuals with French Connections

Individuals who own French property, have French business interests, or regularly spend significant time in France should formally assess their fiscal domicile position under Article 4B CGI. The breadth of the four tests means that French fiscal domicile can be established without any deliberate intention to be French resident — and the consequences (45% marginal rate, 17.2% social charges, wealth tax on French real estate above €1.3 million under IFI) can be significant.

HPT Group assists clients with French connection assessments, treaty tiebreaker analysis, and the planning necessary to ensure that French fiscal domicile is neither accidentally established nor accidentally retained. Our country profile for France provides an overview of the French tax environment, and our consulting team can provide a formal fiscal domicile assessment for individuals with complex French connections.