- Sending — or receiving — a demand letter has no automatic effect on Ontario's limitation clock.
- Starting the lawsuit itself Filing your claim with the court is what stops the clock — not sending a letter threatening to file one.
- A demand letter often does trigger something — just not a legal deadline.
You sent a demand letter months ago. Nothing happened. Now you are wondering whether that letter bought you more time, or whether the clock on your right to sue has been quietly ticking the whole time. It is a common and understandable assumption — you took action, so surely the deadline moved.
It didn't. A demand letter is a communication, not a legal filing, and on its own it does not reset the limitation period in Ontario. Understanding why matters, because assuming otherwise can cost you your entire claim.
The Short Answer
Sending — or receiving — a demand letter has no automatic effect on Ontario's limitation clock. The Limitations Act, 2002 sets a basic two-year period (as of mid-2026 — confirm the current period before relying on it, since limitation rules can change) to start a claim, running from the day the claim was "discovered," not from the day you asked for payment. A demand letter is simply evidence that you asked; it is not itself a legal step that pauses or restarts anything.
This surprises a lot of people because a demand letter feels like the first real step in enforcing a debt. Legally, though, the only thing that stops the clock is either commencing the actual court proceeding (a Statement of Claim or, in Small Claims Court, a Plaintiff's Claim) or something specific happening on the debtor's side — most commonly, an acknowledgment of the debt.
What Actually Affects the Limitation Clock
Starting the lawsuit itself
Filing your claim with the court is what stops the clock — not sending a letter threatening to file one. If you wait too long after your demand letter with no response, you can run out the limitation period before you ever get to court.
Discoverability — when the clock actually starts
The basic limitation period does not necessarily start on the date the money became due. It runs from when you knew, or reasonably ought to have known, that you had a claim worth pursuing against a specific person. This is the discoverability principle, and it is often misunderstood — many people assume the clock starts on the date of the underlying event rather than the date the problem was (or should have been) discovered.
Acknowledgment of the debt by the other side
A debtor's own acknowledgment of a debt can affect the limitation analysis — but this is a narrow, fact-specific legal concept with real technical requirements, not something a demand letter you send automatically triggers. Whether a particular communication counts as a qualifying acknowledgment is a question for a lawyer to assess on your specific facts, not something to assume.
The ultimate limitation period
Separately from the two-year basic period, Ontario law imposes an ultimate limitation period that runs from the act or omission itself, regardless of discoverability. It is a much longer backstop, but it exists precisely so that claims cannot be delayed indefinitely — another reason not to treat a demand letter as buying unlimited time.
Why This Misconception Is So Common
A demand letter often does trigger something — just not a legal deadline. It may prompt payment, an offer to settle, or an admission that puts pressure on the other side. Because it produces a reaction, people reasonably assume it also produces a legal effect on timing. But a reaction from the debtor and a change to the limitation clock are two different things, and only a lawyer reviewing the specific wording of any reply can tell you whether it has legal significance.
There is also a related misconception worth flagging directly: many people assume they automatically "have two years to sue" from the date something went wrong. Some claims — defamation involving a newspaper or broadcast is a clear example — are governed by a separate, far shorter notice and limitation period set out in different legislation entirely. Never assume the general two-year rule applies without checking whether a shorter special rule overrides it for your type of claim.
What to Do Instead of Waiting on a Demand Letter
- [ ] Note the date you believe the claim was discovered, not just the date the debt became due
- [ ] Send your demand letter promptly, but treat it as a negotiation tool, not a deadline extension
- [ ] Set a firm internal reminder well before the two-year mark — do not wait for a response before planning your next step
- [ ] If the debtor replies acknowledging the debt in any way, keep that communication and have it reviewed — it may matter, but don't assume it resets anything on your own
- [ ] If there is any chance a shorter, claim-specific limitation period applies, get that checked immediately rather than defaulting to "two years"
- [ ] If time is getting short, talk to a lawyer about whether to file the claim now and keep negotiating afterward
Frequently asked questions
If I never sent a demand letter, do I still have two years to sue?
Generally yes — a demand letter is not a legal prerequisite to suing in Ontario, and skipping it does not shorten your limitation period. The clock runs from discoverability regardless of whether you sent a letter first. That said, a demand letter is still good practice: it can prompt payment and creates a paper trail showing you gave the other side a chance to resolve things before litigation.
Can I keep sending follow-up demand letters to buy more time?
No. Repeated demand letters do not extend or restart the limitation period. If the deadline is approaching, the only reliable way to protect your claim is to actually start the court proceeding — a Statement of Claim in Superior Court or a Plaintiff's Claim in Small Claims Court, depending on the amount and complexity of your dispute.
What happens if I miss the limitation period entirely?
If a defendant successfully argues your claim was started too late, the court will generally dismiss it regardless of whether the underlying debt is real and unpaid. This is why tracking the discoverability date — not just the due date — matters so much, and why it is worth confirming your timeline with a lawyer well before any deadline you're relying on.
Does a partial payment from the debtor change the limitation clock?
A partial payment can be legally significant, but whether it affects the limitation period depends on specific facts and how the payment was made and characterized. This is not something to assume either way — it is exactly the kind of question a lawyer should review before you rely on it.
This is a litigation question
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