Taxe d'aménagement: the French building tax explained

Which works trigger the taxe d'aménagement?

Any déclaration préalable or permis de construire that creates taxable floor area brings the tax with it. In practice that covers a wide range of home projects on the Cote d'Azur:

• New construction or extensions that add surface de plancher (enclosed, covered floor area over 1.80m in height), such as a veranda, a converted garage, or a new wing.
• Swimming pools, taxed on the surface area of water instead of floor area.
• Garden shelters and outbuildings above the small-structure exemption threshold.
• Parking spaces and hard standing created outdoors, taxed as an aménagement instead of by floor area.

Structures of 5 m² or less are exempt outright. Beyond that threshold, the tax office does not care whether the underlying approval was a déclaration préalable or a full permis de construire: what matters is whether the finished project created taxable surface or installed one of the taxed amenities.

How is the taxe d'aménagement calculated in the Alpes-Maritimes?

The calculation has three layers. First, a flat value set nationally each year: for 2026, outside Ile-de-France, that value is 892 EUR per square metre of taxable floor area, or 251 EUR per square metre of water for a pool. Second, your commune's rate, which can run from 1% to 5%, and in some designated sectors up to 20% where the commune has voted for it. Third, a departmental rate capped at 2.5%. The Alpes-Maritimes departmental council charges the full 2.5%, confirmed in the prefecture's information note on the tax; we found no more recent departmental source revising that figure.

Worked example: a 32 m² pool, in a commune charging the mid-range 4% communal rate, in the Alpes-Maritimes:

• Taxable base: 32 x 251 EUR = 8,032 EUR
• Combined rate: 4% communal + 2.5% departmental = 6.5%
• Tax due: 8,032 EUR x 6.5% = about 522 EUR

Communal rates vary by commune, so the same pool costs less in a commune charging 1% and more in one charging 5% or above. Check your commune's published rate, or ask your installer, before treating any figure as final. For floor-area projects, the same three-layer method applies: multiply the taxable surface by 892 EUR, then by the combined communal and departmental rate.

A 50% abatement applies to the first 100 m² of a habitation principale (main home). It does not apply to a pool, and, as covered below, it does not apply to a second home either.

When is the taxe d'aménagement paid and can you contest the bill?

You have 90 days from completion of the work to declare it, through the "Gerer mes biens immobiliers" section of your account on impots.gouv.fr, or on the paper property-declaration form the tax office supplies. The tax office then calculates the amount from your declaration and issues a notice. If the total due is 1,500 EUR or less, you pay it in a single instalment; above that threshold, payment splits into two instalments over the following months. Missing the 90-day declaration window does not cancel the tax: it just means the office assesses it without your input, and for a pool it also costs you the separate two-year taxe foncière exemption that a timely declaration protects.

You can contest an assessment, but not by going straight to court. The process is a recours prealable: you write to the comptable public handling the collection, laying out why the amount is wrong (wrong surface, a missed exemption, a miscalculated rate). The administration then has six months to respond; silence after six months counts as a rejection.

Only after that refusal, explicit or by silence, do you have two months to take the case to the tribunal administratif. The window to start the whole process runs until 31 December of the second year after the tax notice was issued, and filing the initial claim suspends collection until a decision is made.

Taxe d'aménagement and second homes

Unlike MaPrimeRenov', the taxe d'aménagement is owed on a second home. The base and the rates are identical; the one difference is the abatement below.

Where second homes lose out is the abatement. The 50% reduction on the first 100 m² is reserved for a habitation principale; a residence secondaire is explicitly excluded. On a 100 m² extension to a second home, none of the 50% abatement applies, so the full base is taxed. A pool is unaffected either way, since the abatement was never available for pools in the first place; the 251 EUR/m² forfait and the communal and departmental rates apply identically whether the pool sits at a main home or a holiday house.

Related terms

• Déclaration préalable de travaux: the planning notification that often triggers this tax
• Outdoor & Pools: pool installation, permits, and the taxe d'aménagement worked example for a Cote d'Azur pool
• Renovation: extensions and floor-area projects that bring the taxe d'aménagement with them