Deficit foncier : fonctionnement et strategie 2026
What is this scheme?
Déficit foncier (property income loss) is a real foncier tax regime mechanism: when deductible expenses and works of an unfurnished property exceed received rents, the owner generates a property loss. This loss offsets the household's global income up to an annual cap of EUR 10,700. Beyond that, the excess carries forward against foncier income (only) for the next 10 years. This regime is not an ad hoc scheme: it is a default mechanism of the real foncier regime, particularly powerful in years when significant works are carried out.
Eligibility requirements
Conditions: - Unfurnished property (furnished rental is out: it's BIC, not foncier). - Option for the real foncier regime (automatic above EUR 15,000 of foncier income, optional below via box 4BE). - Deductible works: maintenance, repair, improvement. NOT deductible: construction, reconstruction, extension. - Unfurnished rental commitment for at least 3 years after the year of the last offset.
Tax advantages
The main advantage is offsetting against global income: at 30% marginal rate, EUR 10,700 of property loss saves EUR 3,210 of income tax plus EUR 1,838 of social contributions (17.2%) avoided on the corresponding foncier income, or ~EUR 5,050 saving for the year. The scheme is durable: the 10-year carry-forward excess allows amortising the tax effect over time. It is cumulative with other schemes (Denormandie, Malraux, etc.) as long as regimes are not exclusive.
Drawbacks and limits
The 3-year unfurnished rental commitment constrains patrimonial strategy (impossible to switch to LMNP before this delay under penalty of losing the benefit). Only unfurnished rental is eligible: if you target furnished rental, déficit foncier does not work (rather use LMNP depreciation). The nature of works is strictly framed: requalification of improvement as construction by the administration can cause loss of the offset benefit.
Who is this scheme suited for?
Déficit foncier suits investors: - In UNFURNISHED rental with a property requiring significant works. - At high marginal rate (30%, 41%, 45%) since tax saving is proportional. - Accepting a 3-year minimum unfurnished rental commitment. - Already holding foncier income (to absorb the excess beyond EUR 10,700). It is particularly suited to renovation strategies and investors combining multiple properties in a long-term outlook.
Quantified example
Typical case: old 2-bedroom flat bought EUR 200,000 + EUR 25,000 of deductible works, rented unfurnished EUR 850/month. - Annual rent: EUR 10,200 - Current expenses: EUR 3,200 (property tax, condo, insurance, management) - Works: EUR 25,000 (year 1) - Foncier result: 10,200 - 3,200 - 25,000 = -EUR 18,000 Offset against global income: EUR 10,700 (annual cap) -> ~EUR 3,210 tax saving at 30% marginal rate. Excess: EUR 7,300 carried forward against foncier income for the next 10 years. Social contributions (17.2%) also avoided on EUR 10,700 -> additional saving of EUR 1,840. Year 1 total: ~EUR 5,050 tax savings on EUR 25,000 of works.
How does it compare to other schemes?
Compared to LMNP at real: déficit foncier is more efficient for ONE-OFF and heavy works; LMNP is more efficient to durably depreciate the property and furniture over time. Compared to Denormandie: Denormandie is a direct tax reduction (12-21% of purchase price + works), whereas déficit foncier is a deduction of expenses. Depending on your marginal rate, one or the other may be more advantageous. Compared to Pinel: not comparable, Pinel was a new-build scheme, déficit foncier plays on renovated old stock.