- A limited guarantee caps the guarantor's liability at a stated maximum amount, regardless of how much the primary debtor ultimately owes.
- An unlimited, or unlimited continuing, guarantee has no stated dollar ceiling.
Not all personal guarantees expose a guarantor to the same level of risk. Some are carefully capped at a stated dollar figure; others are open-ended, covering the full amount owed no matter how large the underlying debt grows. Knowing the difference between a limited and unlimited personal guarantee in Ontario — before you sign, and before you assume you know your exposure — can change the entire calculus of a business deal or a personal favour to a family member's company.
This guide compares the two structures, explains how interest and costs interact with a stated cap, and offers practical points to consider if you're being asked to sign one.
What Makes a Guarantee "Limited"
A limited guarantee caps the guarantor's liability at a stated maximum amount, regardless of how much the primary debtor ultimately owes. If the underlying debt grows beyond the cap — through additional borrowing, accumulating interest, or added fees — the guarantor's exposure generally stops at the ceiling set out in the document.
What Makes a Guarantee "Unlimited"
An unlimited, or unlimited continuing, guarantee has no stated dollar ceiling. It typically covers the full amount the primary debtor owes at any given time, including future advances if it's drafted as a continuing guarantee, and can grow along with the underlying debt.
Comparison at a Glance
| Limited Guarantee | Unlimited Guarantee | |
|---|---|---|
| Maximum exposure | Capped at a stated amount | No stated ceiling |
| Covers future advances | Only if the document says so, and generally still within the cap | Often yes, if drafted as continuing |
| Typical use | Negotiated by a guarantor wanting defined risk | Often the lender or creditor's preferred default wording |
| Effect of the debt growing beyond expectations | Guarantor's liability generally doesn't grow past the cap | Guarantor's liability generally grows with the debt |
Where a Cap Does and Doesn't Help
A stated cap protects against the principal amount growing unexpectedly, but the guarantee document's exact wording determines whether the cap also covers interest and costs, or sits on top of them. Some guarantees state the cap applies to principal only, with interest and legal costs added on top; others state the cap is all-inclusive. This single drafting choice can make a meaningful difference to a guarantor's real-world exposure, so it's worth reading — or negotiating — closely rather than assuming a stated guarantee amount is the absolute ceiling.
Ontario courts can also add interest to a judgment at rates the province sets periodically. Because those rates change, they should always be confirmed at the time, rather than assumed from an earlier deal.
Multiple Guarantors With Different Caps
Where several people guarantee the same debt but with different caps — or one guarantor is capped and another isn't — the interplay between them can get complicated. Each guarantor's liability to the creditor is generally governed by their own guarantee document, while any right of contribution between the guarantors themselves is typically assessed against what each of them actually agreed to guarantee, not necessarily split evenly.
Before You Sign: What to Check
- [ ] Is there a stated dollar cap, and does the wording make clear whether it includes interest and costs?
- [ ] Is the guarantee a one-time guarantee or a continuing guarantee that covers future advances?
- [ ] Is there a mechanism to revoke or reduce your exposure over time, for example once the debtor's business hits certain milestones?
- [ ] If there are co-guarantors, is there a separate agreement between you about how liability would be shared?
- [ ] Would negotiating the cap or the interest/costs treatment before signing change your comfort level?
Frequently asked questions
Can I negotiate a cap into a guarantee the creditor drafted as unlimited?
Often, yes — creditors will sometimes agree to a cap, particularly for a guarantor with real negotiating leverage, though whether they agree depends entirely on the deal and the relationship.
If my guarantee is capped at a stated amount, can the creditor still come after more?
Generally no, for anything genuinely outside the cap's wording, but the exact scope depends on whether the cap is drafted as all-inclusive or principal-only, which is why the wording matters so much.
Does a limited guarantee still need to be in writing?
Yes — Ontario's Statute of Frauds generally requires guarantees, whether limited or unlimited, to be evidenced in writing and signed to be enforceable.
Is an unlimited guarantee ever the better option for a guarantor?
Rarely, but it can arise where a guarantor is confident in the underlying business and prioritizes maintaining a lending relationship or credit line over minimizing personal exposure. It's as much a business judgment as a legal one.
This is a litigation question
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