PEI Small Claims Third-Party Claim: When to File Form 10C
Sometimes the person who should really be paying is not part of the lawsuit. A third-party claim lets you, as the defendant, pull that person or business into the case so the court can sort out who actually owes what — all in one proceeding.
What a Third-Party Claim Is
A third-party claim (Form 10C) is a claim by a defendant against someone who is not yet a party to the lawsuit. It is different from a counterclaim, which is filed against the claimant. The third-party claim targets a new party you believe is responsible for all or part of the amount the claimant is seeking from you.
Common situations where this arises in PEI small claims:
- A homeowner sues you (the general contractor) for defective work, but the defect was caused by a subcontractor you hired
- A buyer sues you for a faulty product, but the fault lies with your supplier
- A client sues your business for damages, but another vendor working on the same project caused the problem
How to File Form 10C
To bring a third party into a PEI small claims case, you file Form 10C (Third Party Claim) with the court registry. The claim must fall within the $16,000 monetary limit that applies to all Small Claims Section actions.
Key requirements:
- Include the existing court file number from the original claim
- Name the third party and set out the facts explaining why they should be liable
- Attach any supporting documents (subcontract agreements, invoices, communications)
- Serve the third-party claim on the new party, who then has their own deadline to respond
The third party must respond under Rule 74 and the instructions in the served Form 10C package. Check those requirements for the applicable response deadline and next steps.
Third-Party Claims vs. Counterclaims
These are frequently confused but serve different purposes:
| Counterclaim (Form 10A) | Third-Party Claim (Form 10C) | |
|---|---|---|
| Filed against | The claimant | A new party not yet in the lawsuit |
| Purpose | You claim the claimant owes you money | You claim someone else is responsible for the claimant's loss |
| Monetary limit | $16,000 | $16,000 |
If you are considering both a counterclaim and a third-party claim, check the current Rule 74 requirements or get legal advice before filing them together.
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What Happens Next
Once the third party is served and responds (or defaults), all claims — the original, your defence, any counterclaim, and the third-party claim — are managed together. The settlement conference and any trial will address everything at once.
This is one of the advantages of a third-party claim: instead of two separate lawsuits with potentially contradictory results, the court hears the full picture and allocates liability in a single proceeding.
Getting Help With the Process
The PEI Small Claims Response Guide explains counterclaims, third-party claims, and the defence process with filing instructions and preparation checklists for each stage.
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