The guarantor of a lease: what they sign, what they risk

"Someone will just have to sign for you." The sentence sounds harmless; the undertaking is not. A guarantor is not doing a favour: they are taking on a debt — someone else's, which they will pay if that person does not. Before you ask a parent or a friend to sign, you need to know exactly what you are asking.

What a surety is

The guarantor (the surety, in legal language) undertakes towards the landlord to perform the tenant's obligations if the tenant does not. It is not a contract between guarantor and tenant: it is a contract between the guarantor and the owner. The tenant is not even necessarily a party to the deed.

Two principles structure the matter in Belgian law:

A surety is never presumed. It must be express and in writing. A verbal understanding, an obliging text message, a ticked box with no handwritten wording, do not amount to a valid surety. The guarantor must have intended to bind themselves, knowing the scope of what they were doing.

There is a protective regime for the gratuitous surety — the one who derives no economic benefit from the undertaking, which is the case of a parent guaranteeing their child's kot. That regime, introduced into Belgian law by a 2007 statute, requires among other things that the undertaking be written and limited, that the guaranteed amount be specified, and that the commitment remain proportionate to the guarantor's income and assets. A manifestly disproportionate surety is vulnerable. If you are a guarantor and are being asked for a sum out of all proportion to your means, have the deed read by a lawyer: this regime exists precisely for that.

Simple or joint-and-several surety: the expensive difference

This is the point almost nobody checks, and the only one that really changes the guarantor's life.

A simple surety enjoys two classic protections:

• the benefit of discussion: the landlord must first pursue the tenant and enforce against their assets before turning to the guarantor;
• the benefit of division: where there are several guarantors, each is liable only for their share.

A joint-and-several surety waives both. The landlord can claim immediately and in full from the guarantor, without having to show they tried anything against the tenant first. This is the wording found in practically every Belgian lease — because it is the only one a landlord genuinely cares about.

A guarantor who pays then has a claim against the tenant. Solid in theory, hard in practice: if the tenant did not pay, it is rarely because they had the money.

Check the lease for: the words "joint and several" and "indivisible". If they are there, the guarantor is in the front line.

How far the undertaking goes

Three questions to put to the owner before signing. If the answers are not in the deed, have them added.

What amount? A surety should state the maximum amount guaranteed — for example "rent and charges, up to a maximum of €X". An undertaking "for all the tenant's obligations", with no cap, is an undertaking of unknown size. Have it quantified.

For how long? A nine-year main-residence lease, with renewals and indexation, can add up to considerable sums. A guarantor may legitimately want to limit the commitment — to three years, to the initial term, to one academic year for a kot. It is negotiable, and far easier to negotiate before signing than after. An undertaking given for an obligation of indefinite duration is, in any event, not eternal: the gratuitous-surety regime frames its duration. Have the deed checked rather than assume.

What exactly? Rent alone? Charges? Damage? Interest and legal costs? Every item added widens the exposure. A clean deed lists them.

Finally, the guarantor is not the tenant: they have no right over the property, no right of access, no say in how their child occupies it. They have only the duty to pay. Better to absorb that imbalance before signing.

What a guarantor must provide — and what may not be demanded

A landlord accepting a guarantor wants to be satisfied they are solvent. They may therefore reasonably ask for:

• an identity document;
• proof of income: the last three payslips, or a tax assessment notice for a self-employed person or pensioner;
• possibly proof of ownership or an outline of their assets, where the commitment is large.

What they may not demand — from the guarantor no more than from the tenant: a criminal record extract, health data, information on ethnic origin, religion or family situation, or full unredacted bank statements. The same limits — anti-discrimination law, GDPR — apply. And a rejected guarantor's documents must likewise be destroyed.

No guarantor? There are ways out

Do not assume a file without a guarantor is a dead file. Several levers exist, to be combined.

A well-constituted deposit. A blocked account funded in one payment reassures more than a bank guarantee spread over time. Reminder: the cap on the deposit differs by Region and by form — two months in Brussels whatever the form; two months in a blocked account but up to three for an instalment-based bank guarantee in Wallonia; up to three months in Flanders. Check the applicable figure with your Region's official source.

The bank guarantee. Your bank stands surety towards the landlord and you repay it in instalments. Economically, a professional guarantor.

The public welfare centre (CPAS/OCMW) and regional funds. The welfare centre can lodge the deposit or stand surety. Flanders offers an interest-free deposit loan through the Flemish Housing Fund. These schemes are provided for by law: a landlord who rejects you solely because the deposit runs through the welfare centre is discriminating on the ground of wealth.

Documented income. Two salaries added together, three years of rent payments with receipts, a reference from your previous landlord: that often weighs more than a guarantor the owner has never met.

What to refuse: paying several months' rent in advance "instead of" a deposit. It circumvents the legal cap on the rental deposit and leaves you without recourse if the landlord returns nothing.

Domilinko and the guarantor

On Domilinko, your reusable tenant file can include your guarantor's details and documents. They are stored privately and served through authenticated access: only the owner of a listing you actually applied to can view them, never through a public URL.

Like the rest of the file, they are frozen in a dated snapshot at the moment you send your application: the owner decides on documents that no longer move. If you change guarantor, send a fresh application.

What Domilinko does not do: stand guarantor in your place, insure the owner against unpaid rent, or guarantee payment under a lease. The platform connects the parties, verifies owners' identity, moderates listings, and frames the messaging, the inventory and the key handover. The personal security itself is signed between your guarantor and the owner.

Three questions before signing (guarantor's side)

Signing for someone you love is a legitimate decision. Signing without knowing what you are signing is not.