Releasing a Guarantor in Ontario: When Does a Guarantee Actually End?

Signing a personal guarantee can feel like it lasts forever — and in a real sense, most guarantees are drafted to work that way. But a guarantee is not necessarily permanent. Ontario law recognizes specific circumstances in which a guarantor's liability can end, sometimes without anyone signing a formal document to say so. Understanding releasing a guarantor in Ontario matters whether you gave the guarantee years ago and want out, or you're a creditor trying to figure out whether an old guarantee still binds someone.

The trouble is that guarantors often assume they're off the hook long before the law agrees. Selling your shares in the business, stepping back from day-to-day operations, or simply believing "that was a long time ago" does not, by itself, end a guarantee. What actually discharges a guarantor is narrower and more technical than most people expect.

This guide walks through the recognized ways a guarantee can end in Ontario, the situations that commonly get mistaken for a release, and what to do if you believe your obligation should be over but the creditor disagrees.

What a Guarantee Actually Promises

A guarantee is a secondary promise: the guarantor agrees to pay if the primary debtor doesn't. That means a guarantee is generally tied to the underlying debt or contract it supports — its scope, and its end, both depend on the terms of that underlying relationship and the wording of the guarantee itself.

Ontario's Statute of Frauds generally requires a guarantee to be evidenced in writing and signed by the guarantor to be enforceable in the first place. That same written document is usually where you'll find whether the guarantee is a one-time, specific guarantee tied to one loan or contract, or a continuing guarantee covering an open-ended stream of future debts, such as a revolving credit line or an ongoing supply account. That distinction matters enormously to how — and whether — it can end.

Ways a Guarantee Can Genuinely Come to an End

Novation

If the creditor, the debtor, and the guarantor all agree to replace the original debt or contract with a new one on different terms, the old obligation — and the guarantee tied to it — can be extinguished and replaced. Novation requires the creditor's agreement; a debtor and guarantor cannot novate a deal on their own.

A Material, Unauthorized Change to the Underlying Deal

If the creditor and the principal debtor materially change the terms of the underlying arrangement — substantially increasing the credit limit, significantly extending the term, or otherwise altering the deal in a way the guarantor never agreed to — a court may find the guarantor was discharged from that point forward, on the reasoning that they only guaranteed the deal as it originally stood. Minor or routine changes usually won't have this effect; the change generally has to be significant and outside what the guarantee document contemplated.

Release of the Principal Debtor

If the creditor releases the primary debtor from the underlying debt entirely — as opposed to simply not pursuing them — the guarantor is typically released too, unless the guarantee document specifically says the guarantor remains liable even if the debtor is released. This is why many guarantees include language expressly preserving the guarantor's liability in that scenario.

Revocation of a Continuing Guarantee

A continuing guarantee that covers future advances can often be revoked by the guarantor as to future debts, by giving the creditor written notice, even though the guarantor generally remains liable for whatever was already owed at the time of revocation. The guarantee document's own terms govern exactly how revocation works and what notice it requires.

Expiry or Fulfillment By Its Own Terms

Some guarantees are drafted to expire on a fixed date, or automatically end once a specific debt is paid in full. If the underlying obligation has been fully satisfied and the guarantee wasn't a continuing one, there's often nothing left to guarantee.

What Does Not End a Guarantee

• Selling your shares in, or leaving, the business that took on the debt
• The passage of time alone — a guarantee doesn't expire just because it feels "old," unless its own terms or the applicable limitation period say otherwise
• The creditor giving the debtor extra time to pay, under most standard guarantee wording (many guarantees expressly allow the creditor to grant indulgences without releasing the guarantor)
• A verbal assurance from the creditor that "we won't come after you," without a written release
• The business being sold to a new owner, unless the guarantee is formally assigned, replaced, or released as part of that sale

If You Believe You've Been Released

• [ ] Locate the original guarantee document and read the exact wording on release, indulgences, and continuing-guarantee provisions
• [ ] Gather any written correspondence about a novation, release, or change to the underlying deal
• [ ] Confirm in writing — not just verbally — whether the creditor considers you released
• [ ] Check whether the underlying debt was paid off, replaced, or restructured, and when
• [ ] If the creditor disputes your release, get advice before assuming either position is correct

Frequently asked questions