How to counterclaim against a new party (Form 27B) — and autofill rcp-27b with my-id.ca
Add a counterclaim defendant not in the main action without retyping party details
Defendants counterclaiming against the plaintiff and a person not already a party repeat all party names, addresses, counsel contacts, and court file references on every Form 27B Counterclaim. 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: Ontario Superior Court of Justice — ontariocourts.ca
- Form (Central Forms Repository): FORM 27B- Courts of Justice Act. Counterclaim (Against Plaintiff and Person Not Already Party To Main Action) — rcp-27b
What this form is about
Form rcp-27b is Form 27B — Counterclaim against the plaintiff and a person not already a party to the main action under the Courts of Justice Act and Rules of Civil Procedure — confirm joinder rules on ontariocourts.ca.
Before you start: what to gather
- Counterclaimant legal name and address.
- Plaintiff name and address.
- New counterclaim defendant name and address for service.
- Counsel contacts and court file number.
Confirm the current process on ontario.ca.
How my-id.ca makes it faster
- Save it once. Store your plaintiff, defendant, and counsel identity details 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
- How is 27B different from 27A?
- 27B adds a person not already a party; 27A is limited to existing main-action parties.
- How does my-id.ca help?
- It autofills names and addresses for plaintiff, counterclaimant, and new defendant.
- What about service on the new party?
- Confirm service requirements and timelines 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.