The taxation of rental income is not limited to the choice between micro-property and the real regime. Recent legislative frameworks, particularly around energy renovation and the reclassification of furnished tourist accommodations, profoundly change the decisions for any investor in unfurnished rentals.
Offsetting property deficits and thermal sieves: the mechanism to exploit before the end of 2025
The standard ceiling for offsetting property deficits against global income is set at €10,700 per year. This threshold is well-known. What is less known is the transitional mechanism of “super property deficit” arising from the finance law for 2023, which allows exceeding this ceiling for energy renovation works carried out between 2023 and 2025.
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The condition is specific: the housing must exit its status as a thermal sieve (class E, F, or G) to reach at least class D after the works. The owner must then maintain the property for rent for a minimum duration. Without this class change, the ceiling remains at €10,700, regardless of the amount of works undertaken.
We recommend aligning the work schedule with this window. Classes F and G will gradually be banned for new rentals starting in 2025, with an extension to lease renewals in the following years. Waiting means facing a regulatory obligation without benefiting from the associated tax leverage. To learn more on Voiloo.net, the tax rate applied to rental income directly depends on the chosen regime and the taxpayer’s marginal bracket.
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Real regime or micro-property: technical arbitration beyond the 30% threshold
The micro-property regime applies a flat-rate deduction of 30% on gross rents. The arithmetic logic seems simple: if your actual expenses exceed 30% of your gross rental income, the real regime becomes more advantageous. In practice, the analysis must incorporate other parameters.
Deductible expenses under the real regime: what really matters
Under the real regime, the list of deductible expenses includes loan interest, insurance premiums, management fees, property tax, and maintenance or improvement works. Loan interest, in particular, can only be deducted from rental income (not from global income), creating an asymmetrical treatment compared to other expenses.
- Maintenance and repair works are deductible in the year they are paid, even if the housing is temporarily vacant between two tenants.
- Improvement works (excluding expansion or reconstruction) are deductible for residential premises, but not for commercial premises.
- Excess loan interest can be carried forward to the rental income of the next ten years, a mechanism often underutilized.
- Flat-rate management fees are added to actual rental management costs, effectively doubling the deduction when a management mandate exists.
The real regime becomes necessary as soon as a loan finances the acquisition, because the combination of loan interest plus current expenses almost systematically exceeds the 30% flat-rate deduction during the early years of the loan.
Irrevocable commitment of three years
The option for the real regime is irrevocable for three years. An investor anticipating a decrease in their expenses (end of works, early loan repayment) must assess the relevance of the regime over the entire period, not just the current year.
Unfurnished rentals versus furnished tourist accommodations: what the 2024-2025 finance law changes
The reform passed in the finance law for 2024-2025 reduces the micro-BIC deduction for unclassified furnished tourist accommodations. This measure alters the comparative equation between unfurnished rentals and seasonal furnished rentals.
Until this reform, furnished tourist accommodations benefited from a deduction of up to 71% under micro-BIC, making unfurnished rentals less competitive from a tax perspective at equivalent gross incomes. The deduction gap between furnished tourist accommodations and unfurnished rentals is narrowing significantly, repositioning unfurnished property as a relevant investment vehicle, especially when combined with property deficits.
For investors already engaged in furnished tourist accommodations, we observe a shift towards long-term unfurnished rentals, motivated by both tax pressure and increasing municipal restrictions on seasonal rentals.
Declaration of rental income: common technical errors
The declaration of rental income under the real regime is done through form 2044 (or 2044 special for schemes like Pinel, Malraux). Several errors recur frequently.
- Deducting loan interest from global income instead of confining it to rental income, which leads to a correction during the audit.
- Omitting the carryover of previous property deficits: deficit surpluses can be carried forward for ten years to future rental income, but only if the taxpayer manually carries them forward each year.
- Confusing improvement works with construction or expansion works, the latter being non-deductible.
The distinction between deductible and non-deductible works is based on the jurisprudence of the Council of State and on administrative doctrine (BOFiP). In case of doubt regarding the qualification of a work item, it is prudent to request a tax ruling before incurring the expense.
The taxation of rental income remains a powerful optimization lever provided that the mechanisms of deduction and offsetting are mastered. The regulatory calendar surrounding thermal sieves adds a time constraint that transforms a burden into a tax opportunity, provided action is taken before the expiration of transitional measures.