- In an asset purchase, nothing transfers automatically just because it's connected to the business — the buyer and seller specifically agree, contract by contract, what's being taken on.
- Once an assignment is complete, the buyer generally takes on, from the assignment date forward: - Ongoing rent and additional rent — common area costs, property tax allocations, and…
- - Rent or other charges that came due before the assignment date, unless the buyer specifically agrees to assume them - Disputes with the landlord that arose before the assignment, over…
When a business purchase includes leased premises, buyers often talk about "assuming the lease" as though it's a simple, contained step — sign an assignment, get the landlord's consent, and move in. In reality, assuming a lease means stepping into an ongoing set of legal obligations, some of which are obvious and some of which aren't.
Understanding exactly what comes with the lease, and what stays behind with the seller, is part of the broader asset-versus-share analysis that shapes every Ontario business purchase, but leases have their own specific wrinkles worth walking through on their own.
What "Assuming the Lease" Actually Means
In an asset purchase, nothing transfers automatically just because it's connected to the business — the buyer and seller specifically agree, contract by contract, what's being taken on. A lease is typically handled through a formal assignment, where the buyer becomes the tenant under the existing lease, subject to the landlord's consent.
In a share purchase, this issue mostly disappears: the corporation that holds the lease doesn't change, so there's usually nothing to assign at all — though a lease's change-of-control clause, if it has one, can still require landlord consent even in a share deal.
Obligations the Buyer Takes On
Once an assignment is complete, the buyer generally takes on, from the assignment date forward:
- Ongoing rent and additional rent — common area costs, property tax allocations, and similar charges — under the lease
- Repair, maintenance, and use obligations set out in the lease
- Compliance with the lease's specific default and remedy provisions, including the landlord's right to distress or re-entry
- Whatever conditions the landlord attaches to its consent, if any
Liabilities That Generally Stay With the Seller
- Rent or other charges that came due before the assignment date, unless the buyer specifically agrees to assume them
- Disputes with the landlord that arose before the assignment, over issues unrelated to the ongoing tenancy
- The seller's own liability to third parties connected to the space that has nothing to do with the lease itself — for example, a pre-closing personal injury claim
Quick Comparison
| Question | Buyer's Position After Assignment | Seller's Position After Assignment |
|---|---|---|
| Future rent and lease obligations | Buyer's responsibility | Generally released, but see below |
| Pre-assignment arrears | Not assumed unless agreed | Seller's debt, unless landlord agrees otherwise |
| Landlord's remedies, such as distress or re-entry | Apply to buyer as new tenant | No longer directly relevant once assigned |
| Ongoing liability to the landlord | New, direct liability under the lease | Can remain secondarily liable unless released |
| Pre-existing disputes with the landlord | Generally not inherited | Stays with seller |
Where the Line Gets Blurry
A few areas deserve extra attention, because "the buyer takes the lease going forward, the seller keeps the past" doesn't always play out that cleanly:
- The seller's ongoing exposure. Under general landlord-tenant principles, an outgoing tenant can remain liable to the landlord for the rest of the lease term unless the landlord specifically releases them, even though the buyer is now the one actually occupying the space. Sellers should negotiate for a release as part of the consent process, not assume assignment alone ends their exposure.
- New conditions attached to consent. A landlord's consent letter can bundle in new obligations, such as updated insurance, a fresh security deposit, or a personal guarantee, that go beyond what the original lease required — obligations the buyer is effectively agreeing to by proceeding with the assignment.
- Change-of-control clauses in a share deal. Even where the corporate tenant doesn't change hands on paper, some leases treat a change in who controls that corporation as requiring the same landlord consent as an outright assignment — worth checking regardless of deal structure.
Frequently asked questions
If I assume the lease, am I responsible for the previous tenant's unpaid rent?
Generally not, unless you specifically agree to take it on. But because a landlord's remedies attach to the premises, it's important to confirm the lease is in good standing, ideally through a written landlord estoppel, before closing, rather than relying on the assumption alone.
Does assigning the lease release the seller completely?
Not automatically. Under general landlord-tenant principles, the outgoing tenant can remain secondarily liable to the landlord unless specifically released. Sellers should try to negotiate a release as part of the consent process.
Do I need landlord consent even in a share purchase?
Not always — because the corporate tenant doesn't change in a share deal, many leases don't require consent at all. But some leases specifically define a change of control as requiring consent, so the lease needs to be checked either way.
What's the difference between assuming a lease and assuming a liability generally?
Assuming a lease is one specific example of assuming a liability — an ongoing, defined set of obligations tied to a particular contract. In an asset purchase, every other liability, such as trade debts, litigation, or tax exposure, is negotiated separately and doesn't transfer just because the lease does.
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