Millions of homeowners face higher tax bills as France updates assumed home amenities

Millions of homes in France could pay more property tax from 2027

If you own property in France or follow real estate France markets, this is one to watch. From the 2027 taxe foncière year, local councils will be allowed to assume that older homes contain a range of basic amenities that were often absent when cadastral records were set in the 1970s. That administrative change will raise taxable floorspace figures for many properties and push up bills for owners across the country.

This is not a broad reform of the cadastral rental value system — that larger project remains postponed — but it is a practical, immediate correction to how the valeur locative cadastrale (VLC) is calculated in thousands of communes. The scale is large: about 7.4 million properties are estimated to be affected and the mean increase in bills is estimated at €63 a year for those properties if local mayors opt in.

I will explain exactly how the change works, who will pay more, what this means for buyers and investors, and how homeowners can challenge any incorrect assumptions.

How the change to 'comfort features' works and why it matters

The taxe foncière is partly based on a theoretical annual rental value known as the valeur locative cadastrale (VLC). That VLC calculation uses the property’s floorspace in square metres as one input. Since the 1970s the system has allowed a set of notional additions to floorspace to account for certain fitted features, known in French as "éléments de confort." Those notional additions are now being revisited.

Key mechanics:

• The tax base uses taxable floorspace as recorded in official files. The taxable figure can include added m² to compensate for comfort features.
• The government is now authorising mairies to assume that, unless recorded otherwise, properties include a list of basic amenities.
• Each comfort item translates into a fixed notional increase in m² before any other adjustments.

Specific comfort-feature conversions that are part of the proposal include the following additions to taxable floorspace:

• Running water: +4 m²
• Gas installations: +2 m²
• Mains electricity connection: +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

Put bluntly, a home that is 70 m² on paper could see its taxable area jump above 90 m² once these elements are added, depending on what is assumed present.

Why now? The VLC system has not been systematically updated since its origin in the early 1970s. Many French homes now have standard amenities that were once rare. Yet official records in some communes still list older homes as lacking indoor plumbing, mains electricity or central heating. The change is meant to align assumed amenities with the real state of housing stock, but it is also a de facto local revenue measure.

Who faces higher bills and by how much

The tax authorities estimate 7.4 million properties will be affected. The average increase cited is around €63 a year per property, but the spread will be wide. Some homes may only see one or two assumed additions, adding a small number of square metres and a modest tax rise. Others could be subject to multiple additions, with a bigger increase.

Factors that determine the actual rise include:

• How many comfort features are added to the property’s official file.
• The local tax rate set by the municipal council (the taxe foncière is partly a local revenue source).
• Any concurrent national indexation of the VLC for inflation or local percentage-rate changes.

Crucially, the decision to apply the revised assumptions is left to each mairie. Municipalities must inform tax authorities by September 2026 to have the recalculations reflected on 2027 taxe foncière bills, which are sent in summer 2027. Mayors elected in the March municipal elections will therefore be the ones who decide whether their commune opts in for the 2027 bills.

Expect most mairies to agree. The taxe foncière is one of the few remaining revenue streams over which communes have direct control. Local budgets are constrained and an average uplift of tens of euros across thousands of households quickly adds reliable income for local services.

What homeowners and buyers should do now: practical guidance

We have direct experience with buyer due diligence and investor underwriting, and this change matters for both existing owners and prospective purchasers.

Immediate actions to consider:

• Check the Biens Immobiliers section of your personal tax space online. Since 2023 this is the route used to inform tax authorities of property changes. Verify that recorded features — plumbing, heating, drainage, electricity — match the reality on the ground.
• Request a detailed breakdown of your taxe foncière from the tax office if you see an increase. That statement will show how the taxable floorspace was calculated and which comfort features were included.
• For buyers, demand the last several years of taxe foncière bills as part of your notarial file and review them with your notary. A sudden uplift in 2027 will be easier to model if you understand the current base.
• For investors, re-run operating expense assumptions and cap-rate models to include a plausible scenario where tax rises by more than the average €63. Factor in the timing: bills will reflect the change from summer 2027.
• For owners of older or rural homes, physically document the absence of a feature if it really is absent. Photographs, dated invoices for alternative systems (e.g., septic tank maintenance records), or municipal building certificates strengthen your position.

Practical tips during purchase negotiations:

• If a property’s historic records show omissions that were upgraded by the seller but not declared to tax authorities, ask the seller to provide proof of the upgrades and consider requesting a price adjustment.
• Include a tax-recalculation clause in your offer or preliminary contract if you are buying a rural property with uncertain cadastral records.

I have seen small annual charges compound into material effects on yield calculations. A guaranteed €63 average rise is small for a high-value Paris flat but significant for a low-priced rural cottage where margins already hinge on tight maintenance budgets.

How to contest an incorrect assumption

The new process places the onus on residents to prove the absence of a comfort feature if a mairie assumes it is present. That changes the dynamic: default administrative data will be rewritten to include features unless challenged with evidence.

Steps to challenge:

1. Obtain the breakdown of the taxe foncière from your local tax office to identify which elements were assumed.
2. Gather evidence showing that a comfort feature is not present. Acceptable documentation may include:
   • Dated photos showing the absence of a bathroom or internal toilet.
   • A certificate from a plumber or heating engineer confirming the lack of central heating or mains connection.
   • Records proving a septic tank is in place rather than mains drainage.
3. Submit a formal request to the tax office contesting the recalculation and attach your evidence.
4. If refused, you can escalate to the administrative tribunal, but that is a longer, costlier route and usually best reserved for cases with larger sums at stake.

Be realistic: for many claims the financial benefit of litigation will not cover legal costs.