Affidavit of Service Alberta: How to Prove You Served Court Documents
Filing a civil claim in Alberta is only half the job. The court will not proceed with your case until you prove the defendant was served. That proof comes in the form of a sworn Affidavit of Service — and getting it wrong is one of the most common reasons claims stall at the registry counter.
Which Form You Need
The Alberta Court of Justice uses different affidavit forms depending on what you are serving:
Form CTS11420 — Affidavit of Service of Commencement Documents. This is the one you use after serving the initial Civil Claim (Form CTS1461), a Counterclaim, or a Third-Party Claim. These are the documents that start or expand the lawsuit.
Form CTS11419 — Affidavit of Service of Non-Commencement Documents. Use this for everything filed after the claim is already underway: applications, notices, or Trial Statements.
Form CTS11418 — Affidavit of Service of the Notice to Attend as Witness. This proves you served a witness summons along with the required witness allowance payment.
Most people searching for "affidavit of service" are dealing with their initial claim, so the rest of this post focuses on Form CTS11420.
How to Serve the Claim First
Before you can swear the affidavit, you need to actually serve the defendant. The Alberta Court of Justice recognises two primary methods for commencement documents:
Personal service — You (or someone you send) serve a stamped copy of the Civil Claim and a blank Dispute Note. For an individual, you may leave the documents with them at any location, or at their most usual residence with a resident there who appears to be 16 or older. For a corporation, you may leave the documents at the registered office confirmed on a Corporate Registry (CORES) search, or serve a director.
Recorded mail — You send the Civil Claim and a blank Dispute Note by registered mail or trackable courier. The defendant or someone signing on their behalf may acknowledge receipt. Attach the original recorded-mail receipt and signed acknowledgment to the affidavit.
Ordinary email, text message, or regular lettermail are not valid for serving a Civil Claim.
What Goes in the Affidavit
The affidavit is your sworn statement about the service. It must include the name of the person you served, the date and time of service, the location, the method (personal delivery or recorded mail), and exactly which documents were delivered.
If you used recorded mail, attach the original recorded-mail receipt and signed acknowledgment as exhibits to the affidavit.
The affidavit must be sworn or affirmed before a Commissioner for Oaths, Notary Public, or Judicial Clerk. You cannot simply sign it yourself. Many Alberta courthouses have staff who can commission affidavits, and some registry agents and law offices offer the service for a small fee.
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What If You Cannot Find the Defendant
If personal service and recorded mail both fail — the defendant is avoiding you, has moved, or is nowhere to be found — you can apply for a Substitutional Service Order. File an Application (Form CTS1475) with an Affidavit in Support of Substitutional Service (Form CTS11421) explaining every attempt you made.
The Justice will review your affidavit and, if satisfied, approve an alternative service method that is reasonably likely to reach the defendant — serving an adult family member at their last known address, service by email, or posting to their place of business.
Once the Justice issues the order, you carry out the alternative service exactly as specified and then file your Affidavit of Service proving you did so.
Response Deadlines After Service
Once the defendant is served, the clock starts on their response period. They have 20 calendar days if served within Alberta, one month if served elsewhere in Canada, and two months if served outside Canada. The clock begins the day after service. If the last day falls on a weekend or court holiday, the deadline extends to 4:00 PM on the next business day the registry is open.
If the defendant does not file a Dispute Note within that window, you can apply for default judgment.
Common Mistakes That Delay Claims
Three errors come up repeatedly. First, serving the wrong legal entity — if a business trades under one name but is incorporated under another, and you serve the trade name instead of the legal name, the service is defective. Always do a CORES search first. Second, failing to attach the registered mail receipt — the court will not accept your affidavit without it. Third, having the wrong person swear the affidavit — it should be the person who actually carried out the service, not the claimant sitting at home.
The Alberta Civil Claim Guide includes a service log template and step-by-step instructions for completing Form CTS11420 correctly on the first attempt.
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