Property tax deficit: turn renovation into an income-tax cut

When you rent an unfurnished property and your expenses (loan interest, works, property tax, maintenance fees) exceed your rental income, you generate a property tax deficit. French tax law lets you offset part of this deficit directly against your overall income, up to 10,700 € per year.

Concretely, for an investor in the 30 % bracket, 10,700 € of deficit offset means 10\,700 \times 30\% = 3\,210 € of income tax saved. Add the social charges saved on rents absorbed by expenses, and the real first-year gain often exceeds 4,000 €.

The mechanism is reserved for unfurnished rentals under the actual-expenses regime. Furnished rentals (LMNP or LMP) do not qualify. But when you are planning major works and your top tax bracket is 30 % or above, this is one of the most powerful fiscal levers in French law.

The tax authority distinguishes three categories of deductible works: maintenance (paint, plumbing, electricity), repair (roofing, facade) and improvement (insulation, double glazing, boiler replacement). All three are 100 % deductible from rental income.

What is excluded: any construction, reconstruction or extension. Redoing an existing slab is deductible. Adding 20 m² of living space is not. The line is clear but tricky on mixed projects.

For mixed projects (extension plus interior renovation), ask your contractor for two separate quotes and two separate invoices. The tax office checks the paperwork: if everything is mixed together, they can disqualify the whole batch. Better to spend 30 minutes splitting the line items than lose the entire deduction at audit.

The rule splits in two. Deficit caused by loan interest can only be offset against future rental income for 10 years. Deficit caused by other expenses (works, property tax, insurance) can be offset against your overall income up to 10,700 € per year, with the surplus carried forward against rental income for 10 years.

Direct consequence: if you spend 25,000 € on works in one year, you can only offset 10,700 € against your overall income. The remaining 14,300 € wait to be absorbed by future rents. If you have a single property and rents barely cover running costs, that carry-forward can drag on for several years.

Classic strategy: concentrate major works into a single tax year rather than spreading them out. You maximize the offset against your overall income that year and keep the carry-forward as a buffer for future years. Far more efficient than 5,000 € of works per year over 5 years.

Setup: 3-room flat bought for 200,000 €, monthly rent 800 € (so 9,600 € annual), 30 % tax bracket. This year you pay 25,000 € of insulation and kitchen works, 1,200 € of property tax, 4,800 € of loan interest and 600 € of non-recoverable maintenance fees.

Calculation: rental income 9,600 € minus total expenses 31,600 € leaves a deficit of 22,000 €. Since loan interest (4,800 €) is lower than rental income, it is fully absorbed by the rents and creates no non-offsettable fraction. The 22,000 € deficit therefore comes entirely from other expenses: 10,700 € is offset against overall income and 11,300 € carries forward against rental income for the next 10 years.

Tax outcome: 10\,700 \times 30\% = 3\,210 € of income tax saved on overall income, plus 1,651 € of social charges avoided on the 9,600 € of absorbed rent. Total 4,861 € first-year saving, with 11,300 € of carry-forward to use over the next 9 years.

3-year rental commitment. If you sell, gift or switch to furnished rental before December 31 of the third year following the offset, the tax office reclaims the benefit with late-payment interest. Offset in 2026 means locked in until 12/31/2029 minimum.

Payment date, not invoice date. Works are deductible the year you pay, not the year they are invoiced. If your contractor invoices in December 2026 but you pay in January 2027, the offset goes on 2027. Useful to plan your tax year, but a trap if you miscalculate.

Regime choice locked for 3 years. If you elect the actual-expenses regime to claim the deficit, you are committed for 3 years minimum. No going back to the simplified flat-rate regime if your expenses drop next year. Plan your works calendar 3 years ahead before you opt in.

The property tax deficit is one of the rare schemes that lets you erase part of your income tax bill, not just reduce the tax on rents. For a 30 % bracket investor, 10,700 € offset means more than 3,200 € of income tax saved, with no exotic structuring.

Conditions to respect: unfurnished rental, actual-expenses regime, 3-year commitment, and works that do not touch the structure. If you are in LMNP or your expenses are low, the simplified flat-rate regime (30 % deduction) is easier. The deficit is most powerful on properties needing major renovation or energy upgrades.

Buy&Rent simulates the impact of the actual-expenses regime on your property and compares it automatically with other regimes. You see directly how much deficit you generate, how much you offset against overall income this year, and how much carries forward. No Excel, no lost spreadsheets.