Doubled Property Tax Deficit: 2026 Guide

The doubled property tax deficit (deficit foncier) is a tax mechanism that raises the ceiling for deducting energy renovation works from 10,700 euros to 21,400 euros per year against overall income. This scheme, introduced by the Amending Finance Act for 2022 (law of 1 December 2022), targets landlords who improve the energy performance of properties rated E, F or G.

Introduction

In Paris, where the average price per square metre reaches 11,100 euros in 2026 (9,900 euros median), investing in older properties with renovation works remains one of the few levers combining capital appreciation and tax optimisation. The doubled property tax deficit represented a major opportunity for investors who commissioned energy renovation works before the end of 2025. Even in 2026, its effects continue to unfold for projects launched on time.

This guide details the mechanics of the doubling, the eligibility conditions, and the strategies for making the most of it in the context of a buy-to-let investment in Paris.

Contents

• How does the standard property tax deficit work?
• What conditions raise the ceiling to 21,400 euros?
• Which works qualify for the doubling?
• How much does the doubling save on a Paris property?
• What can you do in 2026 if the works have not started?
• Frequently asked questions

How does the standard property tax deficit work?

A property tax deficit occurs when the deductible charges on a rental property (maintenance, repair and improvement works, loan interest, co-ownership charges) exceed the rental income received. Under the régime réel (actual expenses method), this deficit can be offset against the landlord’s overall income up to a limit of 10,700 euros per year, excluding loan interest.

Any surplus is carried forward against rental income for the following ten years. This mechanism requires the property to remain rented for at least three years after the deficit is offset. For a Parisian investor in the 41% marginal tax bracket with 17.2% social charges, each euro of deductible property deficit generates a real saving of 0.58 euros on overall income.

The property tax deficit is not a specific scheme: it applies to any landlord declaring under the régime réel, without being subject to the cap on tax breaks.

What conditions raise the ceiling to 21,400 euros?

The Amending Finance Act for 2022 introduced a temporary doubling of the property deficit ceiling deductible from overall income, raised to 21,400 euros per year. This doubling applies to energy renovation work expenditure for which a quote was accepted from 5 November 2022 onwards and which was paid between 1 January 2023 and 31 December 2025.

The cumulative conditions are as follows. The property must be rated E, F or G on the Energy Performance Certificate (DPE) before works. The works must enable a move to class A, B, C or D. A new EPC confirming the improvement must be produced after the works. The property must be rented unfurnished as the tenant’s main residence.

The 21,400 euro ceiling applies specifically to the portion of the deficit generated by energy renovation works. Other charges (interest, routine management) remain subject to the standard 10,700 euro ceiling. In practice, an investor can therefore offset up to 21,400 euros in energy works plus the standard deficit from other charges.

Which works qualify for the doubling?

Works eligible for the doubling include energy renovation in the broad sense: thermal insulation (walls, roof, floors, windows), replacement of the heating system, installation of efficient ventilation, and replacement of the water heater. Works must be carried out by RGE-certified tradespeople (Reconnu Garant de l’Environnement).

Excluded are construction, reconstruction or extension works, as well as purely cosmetic works with no impact on energy performance. Architect fees and project management costs related to eligible works are, however, deductible.

The energy class improvement is verified by an EPC carried out after works. In Paris, where a significant portion of the older housing stock is rated D or E, this criterion steers investors towards poorly insulated Haussmann or post-Haussmann buildings. An apartment rated E in the 10th arrondissement moving to class C after full insulation meets the doubling conditions.

For a deeper look at the impact of the EPC on Parisian prices, see our guide to EPC and prices in Paris.

How much does the doubling save on a Paris property?

Around 12,400 euros of tax saving in year one for a taxpayer in the 41% bracket, and over 25,000 euros across three years, close to 40% of the cost of the works. Here is the detailed calculation.

Take a worked example. An investor acquires a 45 sqm property rated F in the 18th arrondissement for 380,000 euros. The cost of energy renovation works (interior insulation, window replacement, new heating system) amounts to 65,000 euros. The property moves to class C after works.

On the tax front, with annual rental income of 14,400 euros (1,200 euros/month) and deductible charges excluding works of 4,500 euros (interest, insurance, management), the property deficit from the works can be offset over three years. In year 1, the investor deducts 21,400 euros of works from their overall income, plus the standard deficit. In years 2 and 3, the balance of works is carried forward against rental income.

For a taxpayer in the 41% bracket, the direct tax saving in year 1 reaches approximately 12,400 euros (21,400 euros x 58.2%). Over three years, the total saving from the 65,000 euros of works exceeds 25,000 euros, nearly 40% of the works cost funded by the tax advantage.

This type of operation is particularly relevant in arrondissements where the older housing stock still offers properties to renovate: 10th, 11th, 18th, 19th, 20th. A property hunter specialising in buy-to-let investment identifies properties whose energy profile and rental potential justify the operation.

What can you do in 2026 if the works have not started?

The doubled property tax deficit applied to works paid until 31 December 2025. In 2026, investors who did not commission works within the deadline revert to the standard 10,700 euro property deficit. This ceiling nonetheless remains a powerful tool.

Several alternative strategies exist. The Malraux law offers a tax reduction of 22% to 30% of the works amount for properties located in a protected zone (secteur sauvegardé) or ZPPAUP, with a ceiling of 400,000 euros over four years. The Denormandie scheme, distinct from the doubled property deficit, provides a tax reduction for the purchase of older properties to renovate in certain municipalities, but Paris intra-muros is not eligible.

For investors wishing to optimise their taxation in 2026, the standard property deficit combined with an SCI à l’IS (company subject to corporation tax) strategy or furnished rental remains relevant. Our buy-to-let investment service supports buyers in choosing the structure best suited to their financial situation.

Carrying forward previous deficits is also a lever: investors who generated a property deficit exceeding 21,400 euros in 2023, 2024 or 2025 can carry the surplus forward against their 2026 rental income, reducing their tax base for several years.

Frequently asked questions

What is the difference between the standard and doubled property tax deficit?

The standard property tax deficit allows you to deduct up to 10,700 euros in works per year from your overall income. The doubled version, introduced by the Amending Finance Act for 2022 for energy renovation works, raises this ceiling to 21,400 euros per year for expenditure incurred until 31 December 2025, with the possibility of carrying forward the remainder to subsequent years.

Is the doubled property tax deficit still available in 2026?

Eligible works had to be commissioned before 31 December 2025. In 2026, only projects launched before that date can still benefit from the doubled ceiling. Works started in 2026 fall under the standard 10,700 euro ceiling, unless extended by legislation.

What types of works qualify for the doubled property tax deficit?

Only energy renovation works that bring a property from an EPC class E, F or G to a class A, B, C or D are eligible. Purely cosmetic works or extensions are excluded from the scheme.

Can the doubled property tax deficit be combined with the Malraux law?

No, the two schemes are mutually exclusive for the same property. However, an investor owning several properties can apply the doubled property deficit to one and the Malraux law to another, provided the conditions specific to each scheme are met.

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Are you considering an investment in older property with renovation works in Paris or Île-de-France? Our property hunters specialising in buy-to-let investment identify the properties offering the best property deficit potential. Contact us for a personalised study of your project.