Mixed SCI for housing and business premises: tax precautions

Quick answer. A mixed SCI holds both housing and business premises. Unfurnished residential rental is VAT-exempt (Tax Code art. 261 D), business-premises rental is too unless an option is made (Tax Code art. 260), which forces an allocation of receipts and charges. Above all, introducing furnished rental into an SCI taxed at income tax can switch the whole structure to corporate tax by operation of law (Tax Code art. 206), unless it stays under the 10% pre-tax tolerance of commercial receipts, to be checked every year.

Holding a residential flat and a commercial unit in one SCI looks practical: a single purchase, a single structure, common partners. Yet this mix creates tax frictions that many partners discover too late, often during an audit, a poorly framed VAT option, or a furnished-rental project. Between VAT to allocate, the income-tax versus corporate-tax choice, and the switch risk linked to furnished rental, the mixed SCI demands a discipline the single-use SCI does not require. We review it through concrete questions, staying on stable principles and flagging the thresholds to watch. For the regime choice itself, we always refer to the overall comparison SCI at corporate tax or income tax.

Our view#

The mixed SCI is viable, but it accumulates the constraints of both worlds if it is not framed. Mixing housing and business multiplies the applicable regimes, and the slightest furnished rental can switch the whole to corporate tax with no easy way back.

Our advice is to identify from creation the exact nature of each rental, then set a written rule on furnished rental: either exclude it entirely from the SCI, strictly contain it under the 10% threshold with an annual review, or accept corporate tax knowingly after simulating the exit gain. The allocation of VAT and charges must be organised before the first return, in the articles and the accounts, not reconstructed afterwards under audit pressure. For sensitive operations, we quantify the arbitrage and secure the option through corporate and owner taxation work, articulated with owner wealth management.

VAT depends on the nature of each rental, and this is the first point to clarify before the first return.

Unfurnished residential rental is VAT-exempt (Tax Code art. 261 D). Unfurnished rental of business premises is also exempt in principle, but the SCI can opt for VAT to recover the tax on its expenses (Tax Code art. 260). In a mixed SCI, these two regimes coexist mechanically: the residential part stays outside the scope of the option, the business part can fall within it. Receipts and expenses must therefore be allocated between these two blocks, otherwise the right to deduct becomes uncontrollable.

This allocation directly determines the VAT deductible on works and charges. An expense assigned 100% to the commercial unit under option gives a right to deduct; an expense assigned to the housing does not; a common expense (roof, façade, renovation of the whole building) is deductible only pro rata to the taxed use. This logic of assessment and deduction coefficients is exactly where we see the most mistakes, a subject we develop in our article on the VAT option of an SCI and the mistakes to avoid. Opting for VAT is never a reflex: it is justified only if the business tenant is itself VAT-registered and if the SCI incurs significant expenses to recover.

The most underestimated risk of a mixed SCI lies not in the use of the premises but in the nature of the rental.

An SCI that lets furnished premises is regarded as carrying on a commercial activity and becomes subject to corporate tax by operation of law (Tax Code art. 206). The danger is that a single share of furnished rental can switch the whole SCI to corporate tax, including the unfurnished housing and the unfurnished business premises. The consequences are not neutral: mandatory depreciation of the buildings, taxation of the result at corporate tax, and above all computation of the exit gain under the professional regime, far heavier than the individual capital gain.

The tax authority does, however, allow a tolerance, confirmed in the BOFiP: a non-agricultural civil company can stay at income tax as long as the pre-tax amount of its commercial-nature receipts, including furnished rental, does not exceed 10% of the total pre-tax amount of its receipts. Beyond that, the switch to corporate tax applies to the whole. This tolerance is a ceiling to monitor every year, not an acquired right: a furnished rental rising in rent, or unfurnished receipts falling, can cross the threshold without any decision being taken.

The question comes up in almost every file where furnished rental is on the table: should everything sit in a single mixed SCI, or should the furnished activity be split into a dedicated structure? The answer turns on one simple parameter, the expected weight of furnished rental in receipts, but its consequences are structuring.

As long as furnished rental stays accessory and durably under 10% of total pre-tax receipts, a single mixed SCI holds up: management is simpler and the income-tax regime preserved, provided the ratio is tracked every year. Once furnished rental becomes a yield objective, hence meant to grow, keeping it inside the SCI means programming the switch of the whole estate to corporate tax, including the unfurnished part you precisely wanted to keep under the individual capital-gain regime.

Our rule of caution is therefore the following: if you anticipate furnished rental above the threshold, set up two structures from the outset rather than waiting for the breach. On one side, an income-tax SCI for unfurnished residential and business rental; on the other, a structure dedicated to furnished rental (furnished-rental status in a partner's name, or an ad hoc commercial company depending on the project). This avoids contaminating the unfurnished estate, isolates the commercial activity, and keeps the flexibility of the individual capital gain on assets held over the long term.

Splitting has a cost (two sets of accounts, two tax returns, sometimes two financings) to weigh against the risk avoided. This is precisely the kind of arbitrage we quantify case by case, connecting it to the question of holding your business premises in an SCI rather than directly or in the operating company.

The income-tax or corporate-tax regime must be arbitrated taking the mixed nature of the holding into account, because the two dimensions (housing and business) do not react the same way.

Under income tax, each partner is taxed on their share of property income, with no depreciation, with the individual capital gain on exit: an allowance for length of ownership rising from the sixth year (6% per year from the 6th to the 21st year, then 4% for the 22nd), that is an income-tax exemption after 22 years of holding, and a social-levy exemption (17.2%) after 30 years. Under corporate tax, the SCI depreciates the buildings and reduces its current tax (reduced rate of 15% up to 42,500 euros of profit, then 25%), but the resale is computed on a net book value reduced by depreciation, which inflates the taxable gain and sharply increases the cost of exit.

In a mixed SCI, this choice therefore interacts with VAT and with the switch risk linked to furnished rental, which makes the arbitrage more structuring than for a single-use SCI. A long, wealth-oriented holding often leans toward income tax; a project combining heavy works, self-financing through rents, and a holding rather than resale horizon can justify corporate tax, provided the exit is accepted. We always connect it to the owner's overall wealth strategy.

An SCI taxed at income tax held a Paris building with two flats let unfurnished and a commercial unit on the ground floor. Annual receipts: around 36,000 euros of residential rent and 18,000 euros for the unit, that is 54,000 euros excluding tax. The partners wanted to furnish one of the flats to raise the rent, without gauging the consequence. The planned furnished rental alone represented more than 6,000 euros a year, well above 10% of total receipts: it would have switched the whole SCI to corporate tax by law, triggering mandatory depreciation of both buildings and, eventually, a professional gain far higher than the individual gain expected. The analysis led them to give up furnished rental in this SCI and to place the furnished activity in a separate structure (furnished-rental status in a partner's name, or a dedicated company), thereby preserving the income-tax regime of the original mixed SCI and the individual capital gain on the historic estate.

In practice#

• Map each unit of the SCI: use (residential or business), nature of the rental (unfurnished or furnished), tenant VAT-registered or not.
• Decide the place of furnished rental before any letting: exclusion, containment under 10%, or accepted corporate tax.
• Track each year the ratio of commercial receipts to total pre-tax receipts, so as not to cross the threshold inadvertently.
• Set up an allocation of charges by use from the opening of the accounts: direct charges assigned, common charges pro rata to floor areas.
• Before any VAT option, check that the business tenant is VAT-registered and that the expenses to recover justify the option and its formalities.
• Have the exit gain simulated under both regimes before opting for corporate tax, as the choice is in principle irrevocable beyond the renunciation period.

• A single furnished rental can be enough to switch the whole SCI to corporate tax: it is not the amount that triggers it, but crossing the 10% threshold of pre-tax commercial receipts.
• The 10% tolerance is computed on pre-tax receipts, as an annual trend: a fall in unfurnished rents can cross the threshold with no new furnished rental.
• Opting for VAT on business premises commits the SCI over time and requires rigorous allocation: opting without expenses to recover or a VAT-registered tenant is rarely worthwhile.
• The corporate-tax option is in principle irrevocable beyond the legal renunciation period: you do not return to income tax for convenience once the latent gain is crystallised.
• The transfer of shares in a real-estate-predominant SCI bears a 5% registration duty (Tax Code art. 726), to anticipate in any transfer or reorganisation strategy.
• An allocation of charges reconstructed after the fact, with no documented objective key, is the first point weakened in an audit.