A verified complaint in Illinois is a civil complaint in which the person filing it swears under oath, or certifies under penalty of perjury, that the factual allegations are true. Most Illinois complaints do not have to be verified. The governing statute, 735 ILCS 5/2-605, is permissive: a plaintiff may verify a pleading, but is only required to do so when a separate statute or court rule says so.1Illinois General Assembly. Illinois Code 735 ILCS 5/2-605 – Verification of Pleadings Choosing to verify, or being required to, changes how the rest of the case unfolds, so it is worth understanding what verification actually does before signing anything.
Verification is a separate step from the signature every attorney already places on a filing under Illinois Supreme Court Rule 137. Rule 137 is a professional certification that counsel investigated the pleading and believes it is grounded in fact and law.2Illinois Supreme Court. Illinois Supreme Court Rule 137 – Signing of Pleadings, Motions and Other Documents – Sanctions Verification goes further: a person with knowledge of the facts swears to the truth of the allegations themselves.
Two Ways to Verify in Illinois
Illinois recognizes two methods of verification, and they carry equal legal weight.
Traditional Oath
Under 735 ILCS 5/2-605, a pleading may be verified by the oath of the party filing it or any other person who has knowledge of the facts. The oath is sworn before a notary or other authorized officer. Corporations verify through any officer or agent with knowledge of the relevant facts.1Illinois General Assembly. Illinois Code 735 ILCS 5/2-605 – Verification of Pleadings
Certification Under Section 1-109
The more common method is a written certification under 735 ILCS 5/1-109, which eliminates the notary step. The signer states, in substantially the form the statute provides, that the statements in the document are true and correct, except as to matters stated on information and belief, which the signer believes to be true.3Illinois General Assembly. Illinois Code 735 ILCS 5/1-109 – Verification by Certification A certification under Section 1-109 has the same legal force as a notarized oath. Courts treat the two identically.
When Verification Is Mandatory
Section 2-605 says a pleading “although not required to be sworn to, may be verified.”1Illinois General Assembly. Illinois Code 735 ILCS 5/2-605 – Verification of Pleadings A handful of specific situations override that default:
- Temporary restraining orders without notice. Under 735 ILCS 5/11-101, a court cannot grant a TRO without notice to the opposing party unless specific facts showing immediate and irreparable harm are presented by affidavit or verified complaint.4Illinois General Assembly. Illinois Code 735 ILCS 5/11-101 – Temporary Restraining Order
- Emergency and subsidized housing eviction proceedings. Sections 9-118 and 9-119 of the Code of Civil Procedure require a verified complaint before the court will act on an expedited timeline.5Justia Law. Illinois Code 735 ILCS 5 – Article IX Forcible Entry and Detainer
- Certain family law filings. Petitions involving orders of protection and some custody-related matters may require verification under the Illinois Marriage and Dissolution of Marriage Act or the Illinois Domestic Violence Act.
Outside those categories, verifying is a choice. The ordinary breach of contract complaint, personal injury complaint, or garden-variety civil action does not have to be verified at all.
What Changes Once a Complaint Is Verified
Filing a verified complaint sets off several consequences that follow the case to its conclusion. These are the reasons the decision matters.
Every Later Pleading Has to Be Verified Too
Once any party files a verified pleading, every subsequent pleading in the case must also be verified, unless the court specifically excuses the requirement.1Illinois General Assembly. Illinois Code 735 ILCS 5/2-605 – Verification of Pleadings A verified complaint therefore forces the defendant to produce a verified answer. The defendant personally, not just defense counsel, has to attest to the truth of each denial. For a defendant who wants to issue broad or noncommittal denials, verification creates a genuine problem: swear to the denial, or ask the court for leave to answer without verification.
Verified Allegations Can Be Used as Admissions
A verified complaint is not evidence in the plaintiff’s favor at trial. Section 2-605 is explicit that verified allegations do not constitute evidence except by way of admission.1Illinois General Assembly. Illinois Code 735 ILCS 5/2-605 – Verification of Pleadings The admission exception runs the other direction: a defendant can use the plaintiff’s sworn allegations against the plaintiff later in the case. Any factual position taken in the verified complaint is locked in.
Automatic Admission of Written Instruments
Section 2-605(b) gives verified complaints a specific procedural teeth in cases involving contracts, promissory notes, and other written documents. If a verified complaint alleges that a defendant executed or assigned a written instrument, that allegation is deemed admitted unless the defendant denies it in a verified response.1Illinois General Assembly. Illinois Code 735 ILCS 5/2-605 – Verification of Pleadings In the right case, this can take an entire factual issue off the table.
How a Verified Complaint Must Be Drafted
Section 2-605 imposes a drafting standard that does not apply to unverified complaints. Each factual matter in a verified pleading must be stated either positively, meaning the verifier knows it to be true from personal knowledge, or on information and belief, meaning the verifier lacks direct knowledge but believes it to be true based on available information.1Illinois General Assembly. Illinois Code 735 ILCS 5/2-605 – Verification of Pleadings
Mixing these up has consequences. Alleging something positively when you only have secondhand knowledge, or hedging on information and belief when you were a direct witness, gives the other side material for credibility attacks and foundation challenges down the road.
The signer must actually have knowledge of the facts. An attorney who did not witness the underlying events is generally not the right verifier; the client or another person with firsthand knowledge is. A corporation verifies through any officer or agent with that knowledge.1Illinois General Assembly. Illinois Code 735 ILCS 5/2-605 – Verification of Pleadings
Penalties for False Statements
A false material statement in a document verified by certification under Section 1-109 is a Class 3 felony.3Illinois General Assembly. Illinois Code 735 ILCS 5/1-109 – Verification by Certification The general Illinois perjury statute, 720 ILCS 5/32-2, likewise classifies knowingly making a false statement under oath as a Class 3 felony.6Illinois General Assembly. Illinois Code 720 ILCS 5/32-2 – Perjury A Class 3 felony in Illinois carries a potential sentence of two to five years in prison. Prosecution for false statements in civil pleadings is uncommon in practice, but the exposure exists.
The more realistic risk is a Rule 137 sanctions motion. Rule 137 authorizes courts to sanction anyone who signs a pleading not well grounded in fact after reasonable inquiry, or filed for an improper purpose. Sanctions can include an order to pay the other side’s reasonable expenses and attorney fees, and when imposed, the judge must explain the reasoning in writing.2Illinois Supreme Court. Illinois Supreme Court Rule 137 – Signing of Pleadings, Motions and Other Documents – Sanctions A party seeking sanctions must show the opponent made false allegations without reasonable cause.7Illinois Courts. Appellate Court of Illinois Opinion – Heckinger v Welsh An allegation that turns out to be wrong is not sanctionable if counsel investigated reasonably before filing.
Should You Verify When You Don’t Have To?
When no statute compels verification, the choice is tactical, and experienced litigators disagree on the default answer.
The case for voluntary verification: it forces the defendant into a verified answer, pinning down factual positions early. It signals confidence in the facts. In contract cases, it can trigger the automatic admission of document execution under Section 2-605(b) and shorten the dispute considerably.
The case against: your client is locked into sworn factual positions before any discovery has taken place. If the facts turn out to be more complicated than the client initially described, those sworn allegations become ammunition for the defense. The “information and belief” option softens the risk for facts the client does not personally know, but it does not help with facts the client swore to confidently and later cannot support.
For a defendant on the receiving end, a verified complaint reshapes the response. The subsequent pleading rule means the answer has to be verified, which requires the client’s personal involvement in reviewing every factual denial. For corporate defendants, that means identifying a knowledgeable officer or agent to sign. The upside is that the plaintiff has handed over a set of sworn statements that can be used as admissions throughout the case.