When roommates sign a single lease together, they are generally joint tenants — each one is individually responsible for the full rent and other lease obligations, not just their own share, unless the lease specifically says otherwise. A roommate moving out, even by mutual agreement among the roommates themselves, does not automatically end their legal obligation to the landlord or reduce what the remaining roommates owe. Options for formally changing who is on the lease include an assignment, a new agreement with the landlord's consent, or a negotiated end to the departing tenant's obligations — but none of these happen automatically just because the roommates agree among themselves. A private roommate agreement does not bind the landlord and is generally only enforceable between the roommates themselves, typically in Small Claims Court rather than at the Landlord and Tenant Board.
- Roommates who sign one lease together are generally joint tenants — each individually responsible for the full rent, not just their share.
- A roommate moving out does not automatically end their legal obligation to the landlord, even with the other roommates' agreement.
- Changing who is legally on the lease requires a formal step — an assignment, a new agreement with landlord consent, or a negotiated release — not just an informal understanding between roommates.
- A private roommate agreement among the roommates themselves does not bind the landlord.
- Disputes between roommates — over money owed to each other, for example — are generally not something the Landlord and Tenant Board will resolve, since it only handles the landlord-tenant relationship.
- The remaining roommates can be pursued by the landlord for the full rent if a departing roommate's share goes unpaid, regardless of any private arrangement among themselves.
The Short Answer
Roommates who sign one lease together are generally joint tenants, meaning each is individually on the hook for the full rent and other lease obligations — not just an agreed-upon share. A roommate moving out does not, by itself, end their legal responsibility to the landlord, even if everyone involved privately agrees that it should.
What Joint Tenancy Actually Means
Under a standard joint tenancy arrangement, the landlord can generally look to any or all of the named tenants for the complete rent owed — it is not divided by law into separate individual obligations just because the roommates privately agreed to split costs a certain way. This surprises a lot of roommates who assumed their own liability was capped at "their share."
However you and your roommates divide the rent informally, the landlord is generally not bound by that private arrangement. If one roommate doesn't pay, the landlord can pursue any of the joint tenants — including you — for the full amount.
Why Leaving Doesn't End the Obligation
Simply moving out — packing up and leaving, even with everyone's blessing — does not legally end a departing roommate's obligations under the lease. The tenancy continues to exist as a legal relationship with the landlord until it is properly ended or changed through one of the recognized formal processes, not just because the roommates have moved on informally.
Formal Options for Changing Who Is on the Lease
A few routes can actually change the legal picture: an assignment of the tenancy to a new roommate (with the landlord's consent) — see our guide on subletting and assigning your rental for how this generally works — a brand new agreement the landlord agrees to enter into with the remaining and new tenants, or a negotiated release of the departing tenant's obligations, sometimes alongside an N11 agreement ending the full tenancy so a new one can start fresh. None of these happen automatically — they all require the landlord's involvement and agreement, and may also involve revisiting the last month's rent deposit already on file.
Why a Roommate Agreement Doesn't Bind the Landlord
Roommates sometimes sign their own private agreement dividing rent, chores, and responsibilities. This can be a genuinely useful document — but it is an agreement between the roommates, and it does not bind the landlord, who remains entitled to treat all joint tenants as responsible for the lease regardless of what the roommates agreed among themselves.
Why the LTB Won't Resolve Roommate-vs-Roommate Disputes
The Landlord and Tenant Board's jurisdiction covers the relationship between landlords and tenants — it generally will not referee a dispute between roommates about who owes whom money or who should have paid what share. If a roommate breaches a private agreement between you, your recourse is typically a separate claim against them, often in Small Claims Court, rather than something the LTB will address.
What to Do Before It Becomes a Problem
Before signing onto a joint lease, understand you are accepting responsibility for the whole tenancy, not a fraction of it. If a roommate situation is already unraveling — someone wants out, someone isn't paying, or you're trying to formally change who is on the lease — get advice on the right formal process rather than relying on an informal understanding. Related issues that often come up between roommates include tenant insurance requirements, who can push for repairs, and pet-related disagreements when only one roommate wants one. If the dispute ends up before the Board, see our guide on LTB application fees. Call 416-274-2222 for a free consultation.
Frequently Asked Questions
Potentially, yes. If you are joint tenants under a single lease, the landlord can generally pursue any or all of the named tenants for the full rent, regardless of an informal understanding about who was supposed to pay what share.
Not automatically. Simply moving out, even with the other roommates' agreement, does not by itself end a departing roommate's legal responsibility under the lease — formal steps are generally needed to actually change who is bound by the agreement.
No. The landlord generally needs to consent to removing or adding a tenant on the lease — roommates cannot unilaterally rewrite who is legally responsible without the landlord agreeing to the change, whether through an assignment or a new agreement.
It can create an enforceable obligation between you and your roommate, but it does not bind the landlord, who can still pursue any joint tenant for the full rent. If your roommate breaches a private agreement, your recourse against them is generally a separate claim, often in Small Claims Court, not something the Landlord and Tenant Board will handle.
Generally no. The Board's jurisdiction is over the landlord-tenant relationship, not disputes between co-tenants about how they divide costs or responsibilities among themselves.
Understand that you are taking on full, individual responsibility for the whole tenancy, not just your portion. Many roommates also sign a private agreement between themselves covering how rent and responsibilities are divided, understanding that it protects them against each other, not against the landlord.