The vacant housing tax and the residence tax on secondary homes rely on the same tipping point: the occupancy status of the property on January 1st. For an owner whose property is genuinely empty on that date, the challenge lies not in the law, but in the proof. Which documents withstand a tax audit, and which hold no value in the eyes of the administration?
GMBI Declaration and €150 Fine: What the Administration Cross-Checks Since 2024
Since the 2024-2026 occupancy declaration campaign on impots.gouv.fr, simply checking the “vacant housing” box is no longer sufficient. The tax administration now cross-checks this declaration with data from the GMBI file (Manage My Real Estate) and can follow up with the owner if the vacancy appears suspicious or too prolonged.
See also : How to Find the Perfect Property for Your Project in Brittany
This consistency check changes the game. A property declared vacant but for which an active energy contract is detected, or for which no rental listing exists, triggers a request for supporting documents. The owner must then provide tangible proof, under penalty of reclassification as a secondary residence (and thus subject to residence tax).
Starting from 2026, a fixed fine of €150 per property applies if the occupancy declaration is missing or incorrect. This penalty encourages documenting the vacancy in advance, not at the time of the audit. The table below summarizes the evidentiary value of the main supporting documents according to their nature.
You may also like : Understanding the Importance of a Warning Light on Citroën C3: Explanations and Tips
| Type of Evidence | Probative Force | Main Limitation |
|---|---|---|
| Bailiff’s report (justice commissioner) | Very strong (authentic act) | Cost (several hundred euros) |
| Energy bills showing zero consumption | Strong | Does not prove the absence of furniture |
| Timestamps photos of empty premises | Medium | Contestable without verifiable metadata |
| Moving invoice | Strong | Date may be prior to January 1st |
| Real estate listing (sale or rental) | Medium to strong | Must be active on January 1st |
| Municipal certificate of vacancy | Strong | Not all municipalities issue it |
To understand in detail how to prove that a property is empty on January 1st, combining several documents remains the most robust strategy in the face of an audit.
Energy Consumption and Bailiff’s Report: The Two Pieces of Evidence That Withstand Tax Audit
Among the supporting documents listed above, two stand out clearly during an examination by the administration.
Zero Consumption Readings
A zero electricity or gas consumption on January 1st constitutes a difficult-to-contest indicator. The reading must cover a sufficient period around this date, not just the month of December. Requesting a detailed monthly history from your supplier allows you to show that the property has not been heated or lit for several consecutive weeks.
However, a canceled contract does not prove that the property is empty of furniture. This is why this document works better in conjunction with another piece of evidence.
Report by Justice Commissioner
The bailiff’s report (now justice commissioner) is an authentic act. It describes the state of the premises, confirms the absence of furniture, and timestamps the visit. This is the most difficult proof to contest before the administration or a court. Its cost represents several hundred euros, but for a property subject to the vacant housing tax for more than a year, the investment quickly justifies itself.
The ideal: schedule the visit of the justice commissioner in the days before or after January 1st, so that the date of the report coincides with the tax reference date.
Furnished or Seasonal Housing: Why Proof of Vacancy Is More Demanding
Owners of tourist furnished properties or properties under LMNP face an unfavorable presumption. The administration assumes that the owner reserves the enjoyment of the property outside of rental periods. A booking calendar with “gaps” is not enough to demonstrate vacancy.
To overturn this presumption, a documented lever exists: the management mandate entrusted to a professional, which explicitly prohibits any personal use of the property by the owner. This mandate, combined with a booking record covering the period around January 1st, shows that the property is exclusively dedicated to rental.
Without this type of document, a seasonal furnished property will almost systematically be treated as a secondary residence, with the corresponding residence tax.
Proving Rental Efforts: An Underutilized Tax Lever
The administration agrees not to apply the vacant housing tax if the owner demonstrates having “done everything possible” to rent the property. This administrative practice offers a complementary angle to the physical proofs of vacancy.
- Screenshots of real estate listings published before January 1st, with visible dates and property details
- Written exchanges with potential tenants (emails, messages on platforms) showing organized visits or justified refusals
- Search mandate entrusted to a real estate agency, with a signature date prior to January 1st
- Quotes or invoices for renovation work, proving that the property was uninhabitable on the reference date
Keeping these documents for several years is recommended, as the vacant housing tax increases with the duration of vacancy. A file compiled from the first year of vacancy avoids the need to reconstruct evidence retrospectively.
The date of January 1st remains the pivot of the entire system. Each piece of evidence must be dated as close to this deadline as possible to have real value. A bailiff’s report made in March or a moving invoice dated in October loses considerable probative force. Anticipating the compilation of the file from November allows for gathering the necessary documents at the right time, without rush or documentary gaps.