How to counterclaim against main-action parties only (Form 27A) — and autofill rcp-27a with my-id.ca
Commence a counterclaim against existing parties without retyping names and addresses
Defendants counterclaiming only against parties to the main action repeat defendant, plaintiff, and other party identities, counsel contacts, and court file references on every Form 27A 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 27A- Courts of Justice Act. Counterclaim Against Parties to Main Action Only — rcp-27a
What this form is about
Form rcp-27a is Form 27A — Counterclaim Against Parties to Main Action Only under the Courts of Justice Act and Rules of Civil Procedure — confirm when to use 27A versus 27B on ontariocourts.ca.
Before you start: what to gather
- Counterclaimant (defendant) legal name and address.
- Plaintiff and other main-action parties names and addresses.
- Counsel name, firm, address, and contacts.
- Court file number and relief sought in counterclaim.
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
- When do I use Form 27A instead of 27B?
- When all counterclaim defendants are already parties to the main action — otherwise use 27B.
- How does my-id.ca help?
- It autofills names and addresses across civil litigation forms.
- Must I also file an election?
- You may need Form 23B to elect to proceed — confirm 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.