How to declare last supply under a construction lien (Form 5) — and autofill cla-5 with my-id.ca
Record last supply on a lien without retyping contractor and owner details
Contractors and suppliers declaring last supply under subsection 31(5) of the Construction Act repeat business names, addresses, and project particulars on every Form 5 declaration. This guide is an example of storing them once in my-id.ca.
Official form and source
Start from the official source and always use the current version — form numbers and links can change:
- Service page: Construction Act — ontario.ca
- Form (Central Forms Repository): Form 5 - Declaration of Last Supply Under Subsection 31 (5) of the Act Construction Lien Act — cla-5
What this form is about
Form cla-5 is Form 5 — Declaration of Last Supply Under Subsection 31(5) of the Construction Act, used in construction lien proceedings — confirm timing and service on ontario.ca.
Before you start: what to gather
- Declarant legal name and address for service.
- Owner or payer name and address.
- Premises or project address and improvement description.
- Last supply date and contract reference — confirm with counsel.
Confirm the current process on ontario.ca.
How my-id.ca makes it faster
- Save it once. Store your business names and addresses in your my-id.ca profile.
- Keep documents ready. Upload supporting documents to my-id.ca Files so you are not searching at form time.
- Autofill the form. Use the my-id.ca Chrome extension on a web form, or fill a PDF from your saved profile inside my-id.ca.
- Review and submit yourself through the official channel.
Why do it in my-id.ca
Related Ontario forms repeat the same personal details. Captured once in my-id.ca — stored in Canada, with AI on its own servers — every form starts mostly complete.
Frequently asked questions
- When is Form 5 required?
- When declaring last supply in a lien matter — confirm subsection 31(5) with counsel.
- How does my-id.ca help?
- It autofills business names and addresses across Construction Act forms.
- How does this relate to lien notices?
- Earlier notices such as Form cla-4 may precede this declaration — confirm sequence with counsel.
Fill it once. Reuse it everywhere.
Save your information in my-id.ca once, then autofill this form and the next one — web forms with the Chrome extension, PDFs right in the app. Your data is stored in Canada and AI runs on my-id.ca's own servers, never sent to third-party AI providers.