The same building can house a physiotherapy office on the ground floor and an apartment on the upper floors. This coexistence between professional use and residential use creates a specific tax regime, where each square meter does not bear the same taxes or the same reporting obligations. Understanding the tax allocation between the two fractions of the property allows for a precise measurement of the costs and revenues of a mixed-use property.
Allocation of the professional and residential share: the surface area criterion
Most guides on mixed-use properties list the applicable taxes without explaining how the administration divides the property between its two uses. Yet, it is this allocation that conditions everything else.
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The reference criterion adopted by the tax administration is the actual area allocated to each use. A liberal professional occupying two rooms out of five for their activity will have their professional share calculated based on this proportion, rather than an arbitrary flat rate.
When the surface area criterion is not relevant (through-going premises, shared spaces between work and private life), another method of allocation may be adopted, provided it can be justified to the tax office. The consistency between the income declaration, property tax, and IFI relies on this same allocation key.
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A property owner wishing to delve deeper into the taxation of a mixed-use property benefits from establishing this allocation as soon as the acquisition occurs, as modifying it afterward often triggers a consistency check.
Tax regime of mixed-use property: comparison between professional share and private share
The professional share and the residential share of a mixed-use property do not follow the same tax rules. The table below summarizes the main differences.
| Tax criterion | Professional share | Residential share |
|---|---|---|
| Declared income | BIC or BNC depending on the activity performed | Property income (unfurnished rental) or BIC (furnished) |
| Property tax | Due, but deductible from professional results | Due, not deductible unless rented |
| Territorial economic contribution (CET) | Applicable (CFE + CVAE) | Not applicable |
| VAT | Applicable according to the activity regime | Exempt (except for para-hotel furnished rentals) |
| IFI | Exemptible if professional property (art. 975 CGI) | Included in the taxable base |
| Depreciation | Possible under the real BIC/BNC regime | Possible only in LMNP or LMP under the real regime |
The most significant difference concerns the deductibility of expenses on the professional share. Property tax, loan interest, maintenance work, and depreciation of the building reduce the taxable result of the professional, while the private share only benefits from these deductions in the context of a rental.
IFI and mixed-use property: the trap of non-professional furnished rental
The exemption from IFI on the professional part of a mixed-use property seems straightforward in theory. In practice, the qualification of “professional property” under article 975 of the CGI imposes strict conditions.
Since the update of the BOFiP on February 21, 2024 (BOI-PAT-IFI-20-30, paragraphs 140 and following), the administration reminds that non-professional furnished rental does not allow for the exemption of the corresponding share for IFI. For a furnished rental activity to neutralize the concerned fraction, several conditions must be met:
- The registration of the lessor in the trade and companies register (RCS), which effectively excludes the majority of classic LMNP
- The habitual nature of the activity and the significance of the income derived from furnished rental
- The personal and effective participation of the owner (or their spouse) in the management of the rental activity
A mixed-use property combining an office and a tourist furnished rental in LMNP remains therefore fully taxable to IFI on its furnished share, contrary to what some simplified schemes suggest. On the other hand, a liberal professional actually working in the premises can easily exclude their professional share, provided they produce the allocation justifications.
Mixed lease and landlord taxation
The landlord who grants a mixed lease receives a single rent covering both uses. This rent must be allocated in their property income declaration (or BIC for furnished) according to the same allocation key used for property tax.
The professional share of the rent entitles the landlord to recover certain expenses from the tenant, notably the household waste collection tax. The CET, on the other hand, remains the responsibility of the business or professional tenant, not the landlord.
Deductible expenses under the real regime: what changes between housing and professional activity
Under the real regime, the professional share of a mixed-use property allows for the deduction of a broader range of expenses than the residential share. Three areas deserve particular attention.
The depreciation of the building is the main tax lever. A professional in BNC or a furnished rental operator under the real regime can depreciate the professional share of the building (excluding land), thus reducing the taxable result without actual disbursement. The residential share occupied by the owner does not benefit from any depreciation.
Maintenance and repair work is deductible on the professional share as operating expenses. On the unfurnished rented share, they are deductible from property income. On the privately occupied share, no deduction is possible.
Loan interest follows the same allocation logic. Only the share corresponding to professional or rental use is eligible for deduction. A single loan financing the entire property must be accounted for separately according to the chosen allocation key.
Property tax and CET on a mixed-use property: two distinct bases
Property tax applies to the entire property, without distinction of use. The owner receives a single notice. The difference in treatment occurs at the time of the results declaration: only the professional share allows for this tax to be deducted from the taxable profit.
The CET (composed of the business property contribution and the CVAE) only concerns the part allocated to the activity. An owner who ceases their professional activity in the property must report the change of allocation to no longer be liable for the CFE on this fraction.
The housing tax, abolished on primary residences, may still apply to the professional share if it is reclassified as a commercial space not allocated to housing. This nuance depends on the legal nature of the premises and its cadastral classification.
The net yield of a mixed-use property is therefore measured fraction by fraction. An owner-occupant who conducts a liberal activity in their property reduces their taxable base on the professional part while retaining the advantage of the primary residence on the private part in the event of a potential resale. This dual tax perspective, applied rigorously from the acquisition, transforms a simple real estate choice into a true wealth management decision.