A mixed property combines, within the same building, a portion allocated to professional activity and a portion reserved for residential use. This classification has direct consequences on the deduction of expenses, the treatment of VAT, the depreciation regime, and the base of the IFI. Here, we detail the technical points that most general public guides do not address, or do so poorly.
Allocation of deductible expenses on a mixed property: the distribution key
The main difficulty of a mixed property lies not in its definition, but in the distribution key between professional use and private use. The tax administration favors the criterion of surface area, but this criterion is not always relevant.
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When the professional activity occupies a dedicated room in a residence, the share is calculated based on the area allocated compared to the total area. We recommend formalizing this distribution with a scaled plan and keeping it in the tax file, as recent audits focus precisely on the consistency between the declared area and the actual use.
To know precisely what a mixed property is in tax terms, it is important to remember that the classification is based on the actual allocation and not on the initial purpose of the premises. An apartment partially converted into a liberal office becomes mixed as soon as the activity is carried out regularly there.
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If the surface criterion is not suitable (activity carried out in several rooms part-time, for example), another method of distribution can be used, provided it is justified. The time of use or energy consumption are alternatives accepted by the doctrine, but they require rigorous documentation.
Taxation of mixed property: depreciation, VAT, and rental income
The professional portion of a mixed property is eligible for depreciation, which is one of its major advantages for a landlord or a liberal professional. The private portion, on the other hand, remains excluded from any depreciation and does not generate any deductible expenses for the activity.
Depreciation and LMNP or LMP status
A property owner who rents part of their property furnished can, under the LMNP or LMP status, depreciate the professional share of the acquisition price, furniture, and works. The allocation must be consistent with the occupation declaration submitted to the DGFiP since 2023.
We observe that some owners fail to distinguish between the works allocated to the rented part and those concerning the private part. This error exposes them to a reassessment of the deducted expenses, increased by late payment interest.
VAT on rents and recoverable charges
VAT does not apply to residential rents. On the professional portion, the recovery of VAT depends on the nature of the activity carried out and the regime chosen by the tenant or operator. A mixed lease signed with a taxable tenant allows the professional part of the rent to be subject to VAT, making the tax on the corresponding works and charges deductible.
In practice, the lease must explicitly allocate the rent between the residential part (exempt) and the professional part (subject to option or by right depending on the activity).
Income declaration: two regimes coexist
The landlord of a mixed property declares the income according to two distinct logics:
- The residential portion falls under rental income (unfurnished rental) or BIC (furnished rental), depending on the type of lease
- The professional portion may fall under BIC, BNC, or BA, depending on the activity of the tenant or the occupying owner
- Common charges (property tax, insurance, maintenance of common areas) are allocated pro-rata to the chosen distribution key
Mixing the two categories of income in the same line of declaration is a common mistake. Each portion must be declared separately, with its own deductible expenses.
Mixed property and IFI: the professional portion excluded from the taxable base
Only the non-professional portion of a mixed property is included in the IFI taxable base. This rule applies whether the professional part is operated directly by the taxpayer or through a professional lease granted to a third party.
The administrative doctrine specifies that the exclusion requires a real and effective allocation to the activity. An office declared as professional but used occasionally does not meet this condition.
The surface criterion remains the reference for determining the taxable share. A liberal professional occupying two rooms out of six in their residence declares the remaining four-sixths in their IFI assets. This allocation must correspond to that retained for the deduction of professional expenses, under penalty of inconsistency detectable by the administration.
Declaration of mixed properties since 2023: strengthened obligations
Since the declaration obligation established from 2023, owners of mixed properties must distinguish, in the online service “Manage my real estate” of the DGFiP, the different units of occupation. Each portion (professional, primary residence, secondary residence, rental) is subject to a separate declaration indicating the occupant(s).
This obligation indirectly impacts property tax and housing tax on secondary residences. A failure to declare or an inconsistency between the declared areas and reality exposes one to a fine and may trigger a cross-check with income declarations.
We recommend updating this declaration every year, even in the absence of changes, to avoid any automatic follow-up. Landlord-owners who modify the distribution between professional and private use during the year must report it within the prescribed deadlines.
- Declare each unit of occupation distinctly (professional part, residential part, rented part)
- Check the consistency between the declared professional area and that retained for tax deduction
- Keep supporting documents for distribution (scaled plan, mixed lease, activity certificate)
The mixed property remains a powerful tax lever for owners who carry out an activity at home or partially rent their building. Its management requires constant documentary rigor: the chosen distribution key must be identical across all tax declarations, from the IFI to rental income, including VAT. Any discrepancy between these documents constitutes the first warning signal during an audit.