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The case centred on a detached house in the Charente department.
Believing his annual tax bills were based on an inaccurate assessment, the homeowner requested the official valuation file for his property from the local land tax office.
The valuation system is highly technical and relies on numerous factors, including floor area, classification of the building, location and maintenance condition.
The document revealed that tax authorities had assigned the house a maintenance coefficient rating (coefficient d'entretien) reserved for properties in "fairly good" condition under French tax regulations.
That coefficient forms part of the calculation of a property's rental value used to determine the taxe foncière (property tax) and, for second homeowners, the taxe d'habitation (occupancy tax).
After examining the assessment, the homeowner argued that the rating no longer reflected the reality of the building. Although the house had been regularly maintained, it had developed permanent defects and had naturally deteriorated over time. He maintained that it should instead have been classified with a lower coefficient corresponding to a property in merely "fair" or "average" condition.
Even a small change in the coefficient can affect the property's rental value and the amount of tax payable.
In an initial tribunal hearing, the homeowner lost his case, with the court ruling that, although the house suffered from permanent defects due to age, the coefficient should remain the same.
The homeowner appealed to the Conseil d'État, France's highest court for administrative matters, which found that the lower court had committed an error of law.
Because the local tribunal had already found that the property's defects were permanent, the Conseil d'État held that its decision to retain the higher coefficient was inconsistent with its own factual findings.
The court therefore ordered a reduction in the homeowner's local taxe foncière and taxe d'habitation, spanning several years.
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