The French tax law is based on a clear principle: only one home can constitute a taxpayer’s principal residence. This concept is linked to the place of effective and habitual residence as of December 31 of the tax year, assessed according to personal, professional, and material interests. Any attempt to declare two principal residences on the same income tax return runs counter to this framework.
However, the question deserves to be posed differently, as a recent decision by the Council of State partially redefines the contours of this rule.
Council of State Decision of July 2026: What Changes for Housing Tax
The Council of State, in its decision of July 7, 2026 (n° 506653), ruled that the concept of principal residence must be assessed individually for each taxpayer, including within a married couple</strong) taxed jointly on income tax. The administrative judge confirmed that a couple can, under certain circumstances, benefit from two distinct principal residences for housing tax purposes.
This decision does not challenge the principle of uniqueness of the principal residence for income tax. It strictly applies to local taxes. Each spouse must demonstrate that the home they occupy is indeed their effective place of residence, with supporting evidence: utility bills, administrative correspondence, proximity to the workplace.
We observe that this case law opens a pathway for couples where one spouse works in another city. The mere choice of convenience is not enough: there must be a documented reality of distinct living arrangements. Seeking to have two principal residences therefore requires gathering a bundle of concrete indicators proving the effective occupation of each home.
Double Principal Residence and Income Tax: The Distinction to Master
In terms of income tax, the rule remains unchanged. A tax household declares only one principal residence. It is this address that determines the exemption from capital gains upon resale, eligibility for certain subsidized loans, and the calculation of the IFI (with a 30% reduction on the market value).
The Council of State’s decision of 2026 does not change anything at this level. A married couple under a community property regime wishing to sell one of its two homes without capital gains tax must prove that this home was indeed the principal residence of the tax household, not just that of one spouse.
Actual Expenses and Double Professional Residence
The most commonly used mechanism to have two addresses recognized for tax purposes remains the detection of actual expenses related to a double professional residence. An employee required to live near their workplace, far from the family home, can deduct from their income:
- The rent of the second home, within reasonable limits compared to the local market
- Transport costs between the two residences (usually a weekly round trip)
- Meal expenses incurred away from home when the employee cannot return
The administration requires that the double residence results from professional constraints and not from a choice of comfort. A couple where both spouses work in distant cities generally meets this condition. However, an employee who chooses to live far from their job without professional constraints will have their deduction denied.
Housing Tax on Second Residences: The Financial Trap to Anticipate
A home that is not recognized as a principal residence is automatically classified as a second residence by the tax administration. Since the gradual elimination of housing tax on principal residences, the second home bears the full burden of this tax, often increased by a local surcharge.
More and more municipalities are applying this increase, which can reach a significant percentage of the base contribution. Tense areas are particularly affected. An owner who fails to have their second home recognized as the principal residence of one of the spouses (according to the 2026 case law) thus faces a non-negligible annual cost.
Documents to Gather to Contest the Status of a Second Residence
In case of a dispute, the administration examines a bundle of converging indicators:
- Water, electricity, and gas consumption, which must reflect regular and not seasonal occupation
- Registration on the electoral rolls of the municipality concerned
- Bank domiciliation, home insurance contracts mentioning the home as the principal residence
- Schooling of children or proximity to the workplace of the occupying spouse
A solid case combines several of these elements. A single isolated document is not sufficient to overturn the classification retained by the tax service.
SCI and Separation of Property: False Good Ideas and Real Levers
Purchasing through a family SCI regularly comes up in wealth management strategies. We recommend caution: owning a home in an SCI does not automatically qualify it as a principal residence. The tax administration looks at effective occupation, not the legal structure of ownership.
The SCI is of interest for wealth transmission or property distribution between spouses separated by property. It offers no specific advantage to circumvent the rule of uniqueness of the principal residence for income tax purposes.
The separation of property regime, on the other hand, facilitates the demonstration of distinct living arrangements between spouses when each owns their own home. Combined with evidence of effective occupation, this marital regime constitutes an additional argument to uphold the 2026 Council of State case law regarding housing tax.
The issue is not just a legal arrangement. It relies on the ability to document a reality of life. Each home must be the effective center of life for the person occupying it, with tangible and consistent evidence over time. Without this coherence, any tax optimization becomes a reclassification waiting to happen.
