# Form LAT-COS: Certificate of Service

Ontario Licence Appeal Tribunal (accident benefits).

Used for: Proves to the Licence Appeal Tribunal that a copy of a document was served on a party: which documents, when, on whom and how.

## Official source
- Form file: https://tribunalsontario.ca/documents/lat/3041E-Certificate-of-Service-1.pdf
- Source page: https://tribunalsontario.ca/lat-aabs/forms-filing-and-fees/
- Version: 2020-12
- Last checked by Router.law: 2026-10-19

## Only the person can do
- Sign the Certificate of Service on page 2.

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