Ontario's most affordable LTB form preparation — starting at $9
Who needs this form?
Anyone who has served a notice or document on another party
When to use it
Complete after serving any notice (N4, N12, etc.) and include it when filing your LTB application.
What happens next
The LTB requires proof that you properly served the other party. Without a COS, your application may be dismissed.
Common mistakes
- ✗Not completing it immediately after serving
- ✗Using the wrong service method — each method has different deemed-receipt rules
- ✗Forgetting to include it with your LTB application