GTA Rental Guide
Landlords use "guarantor" and "co-signer" almost interchangeably, but they create very different legal exposure - for the person signing, and for how a rental application should be structured. This guide covers the real distinction, when Ontario landlords can ask for one, what documents they'll need, and what to do if you don't have anyone who can act as either.
General information only, not legal advice. Guarantor and co-signer agreements vary by landlord and by the exact wording of the agreement - read yours carefully, or get legal advice if anything is unclear.
Guarantor vs. co-signer snapshot
Same word, two very different documents.
Direct Answer
A co-signer is named directly on the lease, alongside the tenant - which means their liability for rent and damages starts on day one, the same as the tenant's. A guarantor signs a separate agreement instead of the lease itself, so their liability is contingent: it only activates if the tenant actually defaults. Landlords and listings in the GTA often use the two words as if they mean the same thing, but the specific document being signed is what actually determines which one applies - not the label on the request. Both are asked for the same underlying reason: the tenant's income, credit, or rental history alone didn't clear the landlord's bar, and both are typically asked to provide the same supporting documents as the primary tenant.
Legal Difference
Liability starts day one
A co-signer signs the lease directly, as a named party to the agreement itself. That means a landlord can pursue a co-signer for unpaid rent or damages the same way they'd pursue the primary tenant - immediately, not as a backup plan. No default has to happen first.
Liability only on default
A guarantor signs a separate agreement, not the lease. Their liability is contingent - it only activates if the tenant fails to pay rent or breaches the lease. In practice, this is the far more common arrangement in the GTA rental market, since it's a lower-commitment ask for whoever's backing the application.
In everyday conversation, GTA landlords and listings often use "guarantor" and "co-signer" interchangeably - but the paperwork determines which one actually applies, not the label a landlord uses. If you're being asked to add someone to a rental file, confirm which document they're actually signing before assuming the lighter, contingent-liability version is the one on the table.
Landlord Rules
Ontario law doesn't prohibit a landlord from asking for a guarantor or co-signer - it's a common request when a tenant's income, credit history, or rental history alone doesn't clear the landlord's bar, and it's frequently used for students, newcomers, and applicants early in their credit journey.
What a landlord can't do is use the guarantor requirement to discriminate against a protected ground under Ontario's Human Rights Code - for example, requiring a guarantor specifically because an applicant is a newcomer or receives social assistance, rather than because of their actual income or credit file. For the full picture of what landlords can and can't screen for, see our Ontario tenant rights guide.
Documents
Landlords generally ask a guarantor or co-signer for the same documentation as the primary tenant - the file needs to prove they can actually cover the rent if it comes to that, not just that they're willing to sign.
See our Ontario rental application checklist for the full list landlords typically expect, and our credit score guide for the benchmarks landlords screen a guarantor's credit against.
Renewals
Typically, a guarantor or co-signer agreement covers the lease's initial term - commonly 12 months in the GTA. Whether it extends into a renewal or month-to-month period after that depends entirely on the exact wording of the agreement, not on a fixed rule: some guarantees are written to continue automatically, and some aren't.
This is worth reading carefully on both sides before signing - a guarantor who assumes their commitment ends after a year could be surprised to find it renews automatically, and a tenant relying on that guarantee could be surprised to find it didn't.
No Guarantor Available
Typically 5-10% of the annual rent as a one-time fee. Used specifically by applicants who don't have anyone able or willing to personally backstop the lease.
Added to the lease directly rather than as a guarantor - this changes the application's numbers rather than adding a third party's liability to the mix.
So the application clears the landlord's bar on its own, without needing a guarantor at all.
See our credit score guide for the fastest ways to build a strong file without a guarantor. If a thin or missing Canadian credit file is the real issue, see our guide to renting without Canadian credit history for what actually works instead of a guarantor.
Next Step
Once you know which one applies to your situation, see our Ontario rental application checklist for the documents landlords typically expect, or use the Key to GTA Rental Readiness tool to review your full file before you apply.
Free readiness check
It takes a few minutes and gives you a clearer view of where your application is strong, what may need work, and what to prepare next.
Start Rental ReadinessFAQ
General information only, not legal advice - agreements vary by landlord and by the specific wording used.
A co-signer is named directly on the lease and shares liability with the tenant from day one - a landlord can pursue them for unpaid rent or damages immediately, with no default required first. A guarantor signs a separate agreement, not the lease itself, and is only liable if the tenant actually defaults. Landlords and listings in the GTA often use the two words interchangeably, but the specific document being signed - lease vs. separate agreement - is what actually determines which one applies.
Yes. Ontario law doesn't prohibit a landlord from asking for a guarantor or co-signer, and it's a common request when a tenant's income, credit, or rental history alone doesn't clear the landlord's bar. What a landlord can't do is use that requirement to discriminate against a protected ground under the Human Rights Code - for example, requiring a guarantor specifically because an applicant is a newcomer or receives social assistance, rather than because of their actual income or credit file.
It depends entirely on the specific wording of the agreement, not on a fixed rule. Guarantee agreements typically cover the lease's initial term - commonly 12 months in the GTA - but some are written to extend automatically into a renewal or month-to-month period, and some aren't. Both the tenant and the guarantor should read the exact wording before signing, since assuming either way can be a costly mistake.
You've still got real options: a paid professional guarantor service (typically 5-10% of annual rent), adding a co-tenant or roommate with stronger income or credit directly to the lease instead of as a guarantor, or building independent Canadian credit history and income proof before you apply so the application clears the bar on its own.