Registering the lease: mandatory, free, and protective

What "registering a lease" actually means

Registering is not "declaring it to the tax office" or getting your contract "approved". It means having the administration formally record that a contract exists, with a given content, on a given date. The lease thereby acquires what lawyers call a certain date: nobody can later claim it was backdated, or that it did not exist, and it becomes enforceable against third parties.

Long a purely federal formality (FPS Finance), it took on a regional dimension in Brussels: since 1 January 2025, leases of Brussels homes are registered with the Region, on the IRISrent platform, and still with FPS Finance (see below). In Flanders and Wallonia the route remains MyRent, the FPS Finance application. The consequences of an unregistered lease are set out in the regional texts, and they are not identical. This guide focuses on the main-residence lease.

Who must do it, by when, and at what cost

The landlord, but the tenant may do it

The registration obligation falls on the landlord. It is not for the tenant to chase the administration. Nothing prevents him from doing it himself if the landlord drags his feet, however: for housing the formality is free, and it protects him directly.

Two months

A lease of a property used exclusively as housing must be registered within two months of signature (four months for other leases). After that, registration remains possible, and still advisable, but as long as it has not been done the landlord loses important protections (see below).

Free of charge

This is the point too many landlords miss: registering a lease of a home is free, as is registering the related inspection report. Only other leases (shops, offices) pay a 0.2% duty, with a 50-euro minimum. For housing there is, literally, no financial reason to skip it.

How to do it in practice

In Flanders and Wallonia: MyRent

The simplest route is the MyRent application, reachable through MyMinfin, the FPS Finance portal, with eID or itsme login. You upload the signed contract as a PDF (and the inspection report), fill in the details of the parties and the property, and receive an acknowledgment and then the proof of registration, which you keep with the lease. Registering through the Legal Security office competent for the property's location remains possible.

In Brussels: IRISrent, and MyRent too

Since 1 January 2025, a lease of a Brussels home is registered on IRISrent, via IRISbox, the Region's online counter: you upload the signed lease, its annexes and the entry inspection report, and answer a few questions about the parties and the home (cadastral parcel, floor area, EPC…). A paper form also exists. This covers leases signed since 2025 and older ones that had not yet been registered on MyRent.

The Region wanted its registration to replace FPS Finance's, but the Constitutional Court annulled that part of the reform. The upshot, as the Region states: Brussels landlords must register their leases on both platforms, IRISrent and MyRent. A unified procedure has been announced as under discussion: check the official page when you register.

What must be registered

• The lease itself, signed, with its contractual annexes.
• The entry inspection report: registering it is also the landlord's duty, free of charge, with the lease or later. A joint, dated report with photos and meter readings is the one that best withstands a dispute (see our guide to the inspection report). Some peer-to-peer rental platforms build it in, such as Domilinko, a Belgian site for direct rentals with no intermediary, where owners' identities are verified and listings show a verified EPC (PEB/EPB energy certificate): keep the signed version so you can register it.
• Later amendments (extension of a short lease, a new co-tenant moving in…): have these registered too.

One simple habit: the day you sign, you register. Do not leave it "for later", that is how two months slip by.

What happens when the lease is not registered

This is where the topic stops being administrative. Between landlord and tenant, an unregistered lease is worth exactly as much as a registered one; it is the regional sanctions that make the difference.

The tenant may leave with no notice and no indemnity

• Brussels and Flanders: after the two-month deadline and for as long as the lease is unregistered, the tenant is bound neither by the notice period nor by the indemnity for leaving early.
• Wallonia: same effect, but only if the tenant has formally required the landlord to register the lease and that formal notice has gone unanswered for one month.

The tenant must still notify his departure in writing (see our guide to giving notice as a tenant). And once the lease is registered, the exemption ends for the future.

In Brussels: no indexation, no increase

In Brussels, as long as the lease is unregistered, the rent cannot be indexed or revised upwards. For a Brussels landlord, registration is therefore the condition for any rent indexation.

If the property is sold

Must the new owner of a rented property honour the running lease? The answer depends on the Region:

• Brussels (sales since 1 November 2024) and Flanders: the buyer steps into the landlord's rights and obligations, and can only end the lease in the cases the law provides (personal occupation, works, etc.).
• Wallonia: full protection requires the lease to have a certain date before the sale, which registration provides. Without a certain date, a tenant who has lived there for at least six months remains protected, but the buyer may end the lease with three months' notice, served within three months of the deed, for personal occupation, works or without grounds. A tenant who moved in less than six months earlier under an unregistered lease is in the weakest position of all.

Why it is in the landlord's interest too

Registration is presented as a burden on the landlord. That is a misreading.

Tenants: check that your lease is registered

Ask your landlord for the proof of registration. If he does not have it, you can register the lease of your home yourself, free of charge, through the same channels. That is also what protects you the day the owner gives notice or sells (see our guide to notice given by the landlord).

Checklist

• Lease signed by all parties, kept as a PDF.
• Joint entry inspection report, dated, signed, with photos and meter readings.
• Registration within two months: MyRent in Flanders and Wallonia, IRISrent and MyRent in Brussels.
• Proof of registration kept with the lease.
• Every amendment registered in turn.

Compatri does not rent out housing and plays no part in your lease: this guide helps you understand your rights and find the right people to talk to. Registration procedures are changing, especially in Brussels: check the official pages below when you register.

Official sources

• FPS Finance: lease agreement: who registers, deadlines, free registration and access to MyRent.
• Brussels: enregistrement bail d'habitation: the IRISrent procedure and the dual registration requirement (in French; also available in Dutch).
• Brussels: federal registration will also be required: the Constitutional Court ruling and what it means for landlords (in French).
• Flanders: woninghuurovereenkomst sluiten: registering the lease and inspection report in Flanders (in Dutch).
• Walloon decree of 15 March 2018 (WALLEX): the text in force, including the sanction for unregistered leases in Wallonia (in French).