# Form LTB-COS: Certificate of Service

Ontario Landlord and Tenant Board.

Used for: Records how and when the person served a document in an LTB proceeding (who served it, on whom, and the method).

## Official source
- Form file: https://tribunalsontario.ca/documents/ltb/Other%20Forms/Certificate%20Of%20Service.pdf
- Source page: https://tribunalsontario.ca/ltb/forms-filing-and-fees/
- Version: 2022-04-01
- Last checked by Router.law: 2026-10-19

## Only the person can do
- The person who served the document signs the certificate. Router.law does not sign anything.

## Fill it with Router.law
- REST: POST https://router.law/v1/forms/LTB-COS/fill (API key)
- MCP: https://router.law/mcp, tool fill_form with form_id "LTB-COS"
- Questions and input schema: get_form_spec("LTB-COS")
- Docs: https://router.law/docs

Router.law spec status: draft. Router.law returns the filled form for a person to review. It never files anything and does not give legal advice.