What a guarantor is actually promising
A guarantor (sometimes called a co-signer) is someone who agrees to be legally responsible for a tenant's obligations under a lease if the tenant doesn't meet them — usually because the tenant's income or credit alone doesn't satisfy the landlord's screening standard. Landlords ask for one instead of denying the application outright.
What a guarantor actually owes isn't set by a general rule of law — it's set by the specific guaranty agreement they sign, which is usually a separate document attached to or referenced in the lease. That agreement is a contract, and its exact wording controls what the guarantor is on the hook for. This is why reading it before signing matters as much as reading the lease itself.
What's typically covered
Depending on how the guaranty is written, a guarantor can end up responsible for:
- Unpaid rent for the full lease term, not just the months the tenant actually lived there
- Late fees and other charges the lease imposes on the tenant
- Damage beyond normal wear and tear when the tenant moves out
- The landlord's attorney's fees and court costs if the landlord has to sue to collect
Some guaranties are limited — capped at a certain dollar amount, or limited to a specific lease term. Others are written broadly enough to cover renewals, lease extensions, or even a new lease the tenant signs later, unless the guarantor specifically ends their obligation in writing. A guarantor should never assume the obligation automatically ends when the original lease term ends.
How a landlord actually collects from a guarantor
If a tenant stops paying rent, a landlord typically has to go through the same kind of process to collect from a guarantor that they'd use against the tenant — a demand letter, and if that doesn't work, a collections claim or lawsuit against the guarantor directly, since the guarantor usually isn't part of any eviction case against the tenant (an eviction removes someone from the unit, and a guarantor who never lived there isn't a party to that). A judgment against a guarantor can affect their credit and finances the same way any other unpaid-debt judgment would.
Say a tenant signs a 12-month lease at $1,600 a month with a parent as guarantor, then stops paying after month six with six months left on the lease. Depending on how the guaranty is written, the parent could be pursued for the remaining six months of rent, any late fees that accrued, and the cost of re-renting the unit if the landlord has to find a new tenant — potentially several thousand dollars, well beyond a single missed payment. That's exactly why capping the guaranty's dollar amount or time period, in writing, before signing, is worth negotiating for.
Screening a guarantor works the same way as screening a tenant
Because a guarantor is taking on financial responsibility, landlords typically run the same kind of credit and background check on a guarantor that they run on the tenant — and they're legally allowed to, for the same reason: the guarantor has initiated a transaction with the landlord by agreeing to sign. California law makes this explicit, defining an "applicant" for purposes of its application-screening-fee law to include an entity or individual who agrees to act as a guarantor or cosignor on a rental agreement — meaning a guarantor there can be charged the same capped, cost-based screening fee as the tenant.
Questions to ask before you agree to be a guarantor
- Is my liability capped at a dollar amount, or open-ended for the full lease term and any renewal?
- Does my obligation end automatically when the lease ends, or do I need to do something in writing to end it?
- Am I liable only for rent, or also for damage, late fees, and legal costs?
- Can I get a copy of the actual guaranty language, not just a verbal description of it, before I sign?
If you're the tenant being asked for a guarantor
Make sure whoever agrees to guarantee your lease actually reads the guaranty document rather than taking your word for what it says — a guarantor who signs based on a summary can end up owing far more than either of you expected. Once your lease is signed, Honestkey™ can review it and flag guaranty, deposit, and fee terms that may not match what your state allows.