How to Serve Small Claims Papers in Arizona

The 45-Day Deadline

Once the clerk accepts your complaint and stamps it with a case number, you have 45 calendar days to serve the defendant and file proof of service with the court. Miss that window and the court dismisses your case without prejudice under ARSCP Rule 5 — you'd need to pay a new filing fee and start over.

The 45-day clock starts the day the complaint is filed, not the day you mail or hand off the papers. Count carefully: day one is the day after filing, and if the last day falls on a weekend or court holiday, it extends to the next business day.

Three Ways to Serve

Arizona law (ARSCP Rule 5 and A.R.S. § 22-513) authorizes three methods. You cannot personally deliver the papers to the defendant yourself.

Certified mail with return receipt requested. You mail the court-stamped summons, complaint, and Notice to Plaintiff and Defendant via USPS Certified Mail with restricted delivery and return receipt. Service is valid only if the green card comes back with the defendant's actual signature — not a roommate, not a "delivered" tracking scan. If the mail is returned "unclaimed" or "refused," service failed and you need to try personal service.

County constable or sheriff. The elected constable of the precinct or county sheriff physically serves the defendant. In Maricopa County, this costs $43 plus $2.40 per mile beyond six miles. Other counties vary. The constable files a Certificate of Service directly with the court.

Private process server. A licensed process server registered with the Arizona Superior Court handles personal or substituted service at the defendant's home or business. Typical cost: $40–$80 in urban areas. The server files an Affidavit of Service.

Serving a Business

If you're suing a business, you can't just hand papers to whoever's behind the counter. You must serve the entity's designated statutory agent — the person on file with the Arizona Corporation Commission. Look up the registered agent on the eCorp portal before arranging service.

For a sole proprietorship, serve the individual owner. For a corporation, serve the statutory agent or a corporate officer. For an LLC, serve the statutory agent or a manager.

Filing Proof of Service

After service is accomplished, you file proof with the court clerk:

• Certified mail: complete the Proof of Service by Registered or Certified Mail form and attach the original signed green card or electronic delivery receipt.
• Constable or process server: the officer files their own Affidavit / Certificate of Service.

Both must be filed within the 45-day window. Once proof is on file, the defendant has 20 calendar days to respond.

When Service Fails

If certified mail comes back unsigned, try again with a constable or private process server. If the defendant is evading service, a process server experienced with "skip-tracing" (locating people who've moved) can help — though it costs more.

The Arizona Small Claims Filing Guide includes a service tracking log for recording mailing dates, tracking numbers, green card signatures, and auto-calculating your 45-day proof deadline so nothing slips.

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