Illinois Proof of Service

Introduction

Key Things to Know

1. 1

   Only a sheriff (or a coroner if the sheriff is disqualified), a licensed or registered private detective, or a registered employee of a certified private detective agency may serve a summons without a court order. Any other private adult needs a judge's order on a motion for a private person over 18 who is not a party (735 ILCS 5/2-202(a)). The statewide Summons, form ATJ 1503.8, builds the proof of service into pages 4 through 6 of the packet and is mandatory and must be accepted in all Illinois circuit courts.

2. 2

   A party to the case cannot serve their own summons. The statewide Summons form tells filers directly that they cannot serve it themselves; service must come from the sheriff (or a coroner if the sheriff is disqualified), a licensed or registered private detective, a registered employee of a certified private detective agency, or a court-appointed private person over 18 (735 ILCS 5/2-202(a)).

3. 3

   Mail alone does not serve an Illinois summons. It supplements substituted service at the defendant's usual abode, or follows a court-ordered special method under section 2-203.1, which itself requires the plaintiff to mail a copy to the defendant's last known residence within 10 days (735 ILCS 5/2-203; Ill. S. Ct. R. 102(f)).

4. 4

   A private server's return is normally by affidavit, but 735 ILCS 5/1-109 lets it instead be an unsworn certification signed under penalty of perjury, with no notary required. A knowingly false certification is a Class 3 felony. A sheriff's or coroner's return needs neither an affidavit nor a certification.

5. 5

   Personal delivery and substituted service are the standard methods: leaving a copy with the defendant personally, or leaving a copy at the defendant's usual place of abode with a family or household member at least 13 years old, informing that person of the contents of the summons, and mailing a copy, a lower age floor than most states use (735 ILCS 5/2-203(a)).

6. 6

   Illinois sets no fixed day count to serve a summons. Instead, Supreme Court Rule 103(b) requires the plaintiff to show reasonable diligence measured against the statute of limitations; the proof of service itself must be filed immediately after service and no later than 21 days before the appearance date for a standard summons, or 3 days for a date-certain summons (Ill. S. Ct. R. 102(b), (d)).

7. 7

   Later papers such as motions go to the attorney of record or, if self-represented, the party directly, and electronic service is the mandatory default method under Rule 11 unless the rule, a court order, a self-represented recipient's lack of email, or extraordinary circumstances that prevent timely electronic service call for another method (Ill. S. Ct. R. 11(c)). Proof is a certificate of service filed under Rule 12; mail service is complete 4 days after mailing.

Illinois Requirements for Proof of Service

• Court Order Required for Non-Official Private Server

  Only a sheriff, a licensed or registered private detective, or a registered employee of a certified private detective agency may serve a summons without a court order. Any other private adult needs a judge's order on a motion for a private person over 18 who is not a party (735 ILCS 5/2-202(a)).

• Party Barred From Serving the Summons

  A party to the case cannot serve their own summons and complaint. The statewide Summons form tells filers directly that they cannot serve it themselves; service must come from the sheriff, a coroner if the sheriff is disqualified, a licensed or registered private detective, a registered employee of a certified private detective agency, or a court-appointed private person (735 ILCS 5/2-202(a)).

• 13-Year-Old Age Floor for Substituted Service

  Substituted service requires leaving a copy at the defendant's usual place of abode with a family or household member at least 13 years old and informing that person of the contents of the summons, then mailing a copy, a lower age floor than most states use (735 ILCS 5/2-203(a)(2)).

• Mail Alone Does Not Serve a Summons

  Ordinary or certified mail alone is not a standalone method of serving an individual defendant's summons. Mail only supplements abode service or follows a court-ordered special method that itself requires a follow-up mailing within 10 days (735 ILCS 5/2-203; Ill. S. Ct. R. 102(f)).

• No Fixed Day Count to Serve; Reasonable Diligence Standard

  Illinois sets no fixed number of days to serve a summons. Supreme Court Rule 103(b) instead ties timing to reasonable diligence measured against the statute of limitations, risking dismissal without or with prejudice depending on when diligence lapses.

• Proof of Service Due Before the Appearance Date

  The return must be filed immediately after service and no later than 21 days before the appearance date for a standard summons, or 3 days before the court date for a date-certain summons (Ill. S. Ct. R. 102(d)).

• Section 1-109 Certification Replaces Notarized Affidavit

  A private server's return is normally by affidavit, but 735 ILCS 5/1-109 lets it instead be an unsworn certification signed under penalty of perjury, with no notary required. A sheriff's or coroner's return needs neither; a knowingly false certification is a Class 3 felony.

• Proof of Service Built Into the ATJ 1503.8 Summons Packet

  The statewide Summons, form ATJ 1503.8, builds the proof of service into pages 4 through 6 of the packet and is mandatory and must be accepted in all Illinois circuit courts. Later papers use the Proof of Delivery page in the statewide Motion packet, form ATJ 801.7.

• Electronic Service Mandatory Default for Later Papers

  Supreme Court Rule 11(c) makes electronic service the mandatory default method for documents other than the summons, unless a rule or court order specifies otherwise, a self-represented recipient lacks email, or extraordinary circumstances prevent timely electronic service. Mail service of later papers is complete 4 days after mailing (Rule 12).