Property-Occupancy Declaration 2026 in France (GMBI): Who Must File, How, and Before When

Every spring, millions of property owners in France must check — and where necessary update — the occupancy status of their real estate through the GMBI online service (Gérer mes biens immobiliers, "Manage my real estate") on impots.gouv.fr. For the 2026 campaign, the official deadline is 30 June 2026 to declare the position as at 1 January 2026. A common administrative tolerance extends this to 1 July 2026, but relying on that margin with a large portfolio is not a sound strategy.

The property-occupancy declaration (déclaration des biens immobiliers) is not limited to owners of holiday homes or second residences. SCI (French property-holding companies), LMNP (non-professional furnished-rental status) landlords, LMP (professional furnished-rental status) landlords, joint owners, usufructuaries, and companies holding residential units are all in scope. The French tax administration now systematically cross-checks the occupancy data you submit through GMBI against income tax returns, registered leases, and the national property register. Inconsistencies trigger automated flags. This article sets out what you need to know and do before the end of June 2026.

The filing requirement is grounded in article 1418 of the French General Tax Code (Code général des impôts, CGI), introduced by the 2020 Finance Act. It requires every owner of a residential property in France to inform the tax administration of the occupancy status of each unit, so that the administration can correctly calculate:

• the taxe d'habitation on secondary residences (THRS) — the principal residence housing tax was abolished for all households in 2023;
• the taxe sur les logements vacants (TLV), a tax on vacant dwellings applied in designated tension zones.

The obligation is not a duplicate of your income tax return. It is a distinct, property-level filing that feeds the local taxation system and cross-referencing mechanisms.

The table below summarises who is in scope and what types of property are covered:

Out of scope: premises used exclusively for commercial activity, stand-alone garages (not attached to a residential unit), and cellars or outbuildings that cannot constitute habitation.

If you own a single studio flat let to a tenant, you are in scope. If your SCI holds ten apartments, each must be declared individually.

This is the most frequently misunderstood aspect of the obligation. You are not required to file every year as a matter of course. A filing is required only if:

• you have never previously submitted an initial declaration for a given property;
• an occupancy change occurred between 2 January 2025 and 1 January 2026 — a new tenant, a vacancy, the start or end of a furnished letting, a change of personal occupation;
• a prior change was never reported to the administration.

If nothing has changed since your last validated filing and all your data remains accurate, you have no action to take in 2026. Many owners reconnect to GMBI every year out of caution without any need to do so. The right approach is to log in, verify what the administration shows, and only update what has actually changed.

Our reading: do not wait until the last week of June if you hold several properties or an SCI with multiple buildings. A portfolio of five units with different occupancy situations, mid-year tenant changes, and cadastral data to verify can realistically take half a day to process correctly. The earlier you start, the more time you have to correct any errors in the pre-filled data.

The process is exclusively online through the GMBI service, accessed from either your personal (espace particulier) or professional (espace professionnel) account on impots.gouv.fr. No paper form exists.

1. Log in to impots.gouv.fr using FranceConnect or your standard credentials (tax reference number and password).
2. Navigate to the "Gérer mes biens immobiliers" section — it is also searchable via the site's internal search bar.
3. Review the pre-filled list of your properties. The administration populates this list from the national property register (fichier immobilier). Verify that every unit you own appears correctly.
4. For each property where the occupancy position has changed, click on the relevant unit and enter: the nature of the occupation (principal residence, secondary residence, let property, or vacant), the identity of the occupant if the property is rented, and the start date of the current occupancy.
5. If a property does not appear in your list, add it manually by entering the cadastral reference and full address.
6. The rent amount field may be displayed for let properties. As of spring 2026, this field is optional — however, completing it is recommended because it helps align your GMBI filing with your rental income tax return (form 2044 for unfurnished lettings, form 2031-SD for furnished lettings, or form 2065 for an SCI subject to corporate tax).
7. Validate each amended unit, then confirm the full declaration.

Hayot Expertise note: The most common error is not a complete omission — it is a misclassified property. An unfurnished letting declared as furnished, an unexplained vacancy, a tenant change not updated, or a co-ownership unit pre-filled with an inaccurate cadastral description. Cross-reference your leases, inventory reports, and taxe foncière notices against the GMBI data before confirming.

One point worth clarifying: the rent figure entered in GMBI is separate from the rental income declared in your income tax return. Entering an amount in GMBI does not replace or modify your income tax filing — but a clear discrepancy between the two will attract administrative attention.

Article 1770 terdecies of the CGI provides for a fixed penalty of €150 per residential unit in cases of:

• complete failure to file;
• omission of a unit;
• late filing (after 30 June 2026);
• inaccurate or incomplete information.

Worked example: A Paris-based owner holds three unfurnished rental apartments. Two tenants changed in spring 2025 and the owner forgets to update those two units in GMBI. Potential penalty: 2 × €150 = €300. Had all three units never been declared, the total exposure would be €450.

For an SCI (French property-holding company) holding ten units, four of which changed occupancy during 2025: potential penalty of €600 if those four are not filed or are filed late.

Beyond the fixed penalty, the tax administration has the right to make ex officio corrections when declared data is inconsistent with information it already holds — registered leases, income tax returns, property register entries. This automated cross-checking is now operational and serves as a targeted audit-selection mechanism for undeclared rental income.

SCI (French property-holding company): who files and how to ensure consistency#

An SCI (French property-holding company) must file from its professional account (espace professionnel) on impots.gouv.fr. The gérant (managing partner) or legal representative acts on behalf of the company. Two errors recur regularly in the SCI files we manage:

• Declaring the partners as occupants when the properties are in fact let to third parties — a clear inconsistency with the SCI's form 2072 (IR-taxed SCI) or form 2065 (IS-taxed SCI);
• Overlooking a recently acquired building that has not yet been linked to the SCI in the administration's property register, meaning it does not appear in the pre-filled list.

The GMBI filing for an SCI should be treated in parallel with the annual accounts review: occupancy data entered must align with rental income reported in the company's accounts and tax return.

LMNP and LMP furnished landlords: qualification risk#

Among our LMNP (non-professional furnished-rental status) and LMP (professional furnished-rental status) clients, the most common friction point is occupation qualification: a property declared "vacant" in GMBI while a furnished rental activity is actually being carried out — often because the owner never updated the declaration when the activity began. This inconsistency can lead the administration to challenge the application of the micro-BIC or actual-expense regime, and to incorrectly apply the vacant property tax.

Furnished landlords must also ensure that the declared occupancy periods in GMBI correspond to actual periods of rental activity — particularly for short-term lets such as Airbnb, where inter-tenant vacancy periods can create ambiguity.

For a fuller analysis of the furnished rental regime, see our article on LMNP rules and optimisation in 2026 and our dedicated LMNP accounting Paris page.

Joint ownership and usufruct#

In a joint ownership arrangement (indivision), one co-owner files on behalf of all. In a usufruct arrangement, it is the usufructuary — not the bare owner (nu-propriétaire) — who is required to declare the occupancy, since it is the usufructuary who has the effective right of use.

The administration pre-populates your property list from cadastral records and the national property register. These data are generally reliable for properties held for several years, but they can be inaccurate in several scenarios:

• a recently acquired co-ownership unit whose transfer has not yet been registered;
• a building split into multiple units whose cadastral description is imprecise;
• a restructured property (merged units, subdivision, vertical extension) whose description no longer matches the physical reality.

The risk: confirming a declaration based on an inaccurate pre-filled list exposes you to a penalty for "incomplete or inaccurate information" — even though you filed within the deadline. The practical rule: do not confirm without verifying that each unit on the list corresponds exactly to what you actually own.

The administration now automatically cross-references GMBI occupancy data against several sources:

Owners who address GMBI at the same time as their annual real estate tax review or their SCI IR vs IS arbitration avoid the vast majority of documentary inconsistencies. One hour of cross-checking can prevent months of administrative correspondence.

We assist individual owners, SCI (French property-holding companies), and furnished landlords in verifying and securing their GMBI filings — particularly where the portfolio includes multiple units, an SCI structure, or a furnished rental activity with complex occupancy periods. Our involvement covers the review of pre-filled data, consistency checks between occupancy, rents, and tax returns, and documentation safeguards before submission.

Disclaimer: This article is for general information purposes only. It does not constitute personalised tax advice and does not replace a review of your specific situation by a qualified professional. French tax rules and filing conditions may change. Consult a chartered accountant (expert-comptable) or tax adviser before making any decision affecting your personal tax position.