French councils can hike property tax by assuming undeclared ‘comfort’ features — what owners must do now

New municipal powers mean extra bills for property in France — and a paperwork scramble

If you own property in France, a quiet tax change could add hundreds to your annual bill. Municipal councils elected this spring have been given the option to increase local property tax (taxe foncière) by assuming that dwellings include certain undeclared "comfort features" such as a bath, central heating or mains drainage. For buyers, investors and expats this is not abstract policy: it affects how much you pay each year and how you should document a home’s fittings.

This story matters because the move could touch around 7 million homes — about a quarter of houses and 15% of flats — and the estimated average rise is €63 a year, applied from the 2027 tax bills. The standard annual taxe foncière for a house currently averages about €1,100, so this is a non-trivial recurring cost for many owners.

Why this is happening

Local property taxes in France are built on a theoretical rental value called the valeur locative cadastrale (VLC). VLC calculations are complex but include two main components:

• a property’s floorspace in square metres, and
• notional additions for so-called comfort features (electrical supply, running water, bath, central heating and similar).

Those comfort features were treated as luxuries when the VLC system was last updated in the early 1970s. Today they are standard in most homes, and the tax authorities are moving to assume those features are present where no declaration exists. The economy ministry briefing note that revealed the change suggests this is a broad-based adjustment to generate additional revenue.

What the tax change actually does

Municipal councils can choose to apply increases to the taxe foncière by adding notional surface areas for comfort features to the VLC formula. The official notional additions include:

• Running water: +4 m²
• Gas installation: +2 m²
• Electricity: +2 m²
• Bath: +5 m²
• Shower cubicle: +4 m²
• Toilet: +3 m²
• Wash basin: +3 m²
• Connection to mains drainage: +3 m²
• Central heating: +2 m² per room

These extra square metres feed into the VLC, which in turn influences local taxes that rely on that cadastral rental value.

Key operational points:

• Councils must notify their intention to apply this option by the end of September for it to affect the following year’s taxes. That is the immediate deadline owners should watch.
• Owners can file une demande de dégrèvement to contest an increase if they can prove a particular comfort feature is absent.
• Recent builds that declared their fittings on completion are unlikely to be affected because the features would already be recorded.

Who stands to be hit — regional winners and losers

Expect disparities across departments and municipalities. The draft estimates point to sharp geographic differences.

• The department of Haute-Corse may see the largest share affected — around 60% of homes.
• Paris is estimated at roughly 25%.
• Parts of Pays-de-la-Loire and Isère could see about 10% of homes impacted.
• Haute-Garonne is expected to be among the least affected.

This uneven distribution matters for investors deciding where to buy. Areas with older housing stock and a history of piecemeal upgrades are more exposed; newer suburbs and recent developments are less exposed.

Practical implications for owners, buyers and investors

We list the concrete actions and consequences you should absorb right now.

• Financial impact: average rise of €63 a year, added to an existing average taxe foncière of €1,100 for a house. For some owners the rise will be higher or lower depending on the number of notional features assumed and the municipality’s rates.
• Investment yield: For buy-to-let landlords, every extra euro of recurrent tax reduces net yield. If you price a property assuming current holding costs, build a tax buffer of at least the estimated average increase.
• Negotiation and due diligence: When buying, ask for the property’s VLC declaration and any correspondence with tax services. If a home has undocumented amenities, the buyer can request warranties or price adjustments.
• Administrative burden: Owners who disagree will need to gather evidence — original building permits, installation invoices, dated photographs, or sworn statements — and lodge a formal request for a reduction with the tax office.
• Local politics matters: Because municipal councils set local rates and must vote to apply the assumption, election outcomes and council budgets will influence whether the increase is implemented locally.

My reading is blunt: the measure is a revenue grab dressed up as a cleanup of the cadastral system. The burden of proof has shifted; owners must be proactive to avoid paying for upgrades they never claimed.

How to respond: a step-by-step checklist

If you own property in France or are due to buy, here is a practical sequence to follow.

1. Check whether your property appears correctly in the Biens immobiliers declaration and review past taxe foncière bills for any declared comfort features.
2. Collect hard evidence now: plumbing or heating invoices, photographs with timestamps, building or renovation permits, and energy performance diagnostics if they mention systems.
3. Monitor municipal council announcements before the end of September; contact your mairie to ask whether it intends to opt in.
4. If you receive a revised tax assessment you believe incorrect, file une demande de dégrèvement promptly and supply documentary proof.
5. For buyers: add a warranty clause in sale negotiations that the vendor will settle any pending tax claims or provide a price reduction equivalent to the higher tax for a defined period.
6. Landlords should prepare for the new vacant-property tax regime (TVLH) from 2027, which could raise costs in areas under housing pressure (zones tendues).

This is administrative work, but it is inexpensive compared with an ongoing annual uplift to your holding costs. We advise keeping digital and physical copies of all evidence and consulting a tax professional for complex cases.

The broader reform picture: VLC overhaul and the TVLH

The comfort-features adjustment is just one piece of a wider reform agenda.

• From 2027, taxation of vacant dwellings will change. Two current taxes — one local and one central — are being combined into a new taxe sur la vacance des locaux d’habitation (TVLH). As a local tax, councils will set rates and can target areas with housing pressure (zones tendues). This will not affect furnished second homes, which remain subject to taxe d’habitation.
• At the same time, declaring rents in the online Biens immobiliers property declaration form is expected to become mandatory from 2027 so the state can feed real-market rents into the VLC reform. Currently declaring rents is optional.
• A full reform of the VLC system remains under development and is expected sometime early next decade. That reform has been repeatedly delayed.

These changes mean the cadastral value system will connect more closely with actual market data over time.