Illinois Demand Letter

Introduction

Key Things to Know

1. 1

   Illinois does not require most consumers to send a demand notice before suing for consumer fraud, but if you were paid with a dishonored check, 720 ILCS 5/17-1(E) requires a written demand sent by both certified mail and first-class mail to the drawer's last known address, giving the drawer 30 days to pay from delivery, or from an attempted delivery if certified delivery is refused or unclaimed, before you can recover the check amount plus treble damages, not less than $100 nor more than $1,500, plus attorney's fees and court costs.

2. 2

   No Illinois statute lets a creditor recover attorney's fees simply for presenting a claim and waiting out a deadline before suit; the closest Illinois statute, the Consumer Contract Reciprocal Attorney's Fees Act, 815 ILCS 604/10 and 604/15, instead lets a prevailing consumer defendant recover fees when a commercial party sues on a one-sided fee clause in a consumer contract and the principal amount claimed does not exceed the small-claims limit.

3. 3

   The narrow exception to Illinois's no-notice rule is a claim against a new or used vehicle dealer or a retail installment contract holder under the Consumer Fraud Act: 815 ILCS 505/10a(h) requires written notice of the alleged violation and demand for relief at least 30 days before filing suit.

4. 4

   A dishonored-check demand under 720 ILCS 5/17-1(E) must also tell the drawer that before any hearing on the claim, the drawer may tender the check amount plus the court costs and attorney's fees incurred, and you must accept that tender as full satisfaction of the claim.

5. 5

   Illinois's Collection Agency Act was narrowed effective January 1, 2026 so a creditor collecting its own debt under its own name is generally not regulated as a collection agency (205 ILCS 740/2). Separately, never threaten arrest, jail, or criminal prosecution to collect a civil debt: Illinois's criminal intimidation statute, 720 ILCS 5/12-6(a), makes it a Class 3 felony to threaten, without lawful authority, to accuse anyone of an offense in order to make them act.

6. 6

   Illinois gives 10 years to sue on a written contract (735 ILCS 5/13-206), and 5 years to sue on an oral contract, an open account without a signed writing, or an injury to property (735 ILCS 5/13-205); a contract for the sale of goods gets 4 years under the Uniform Commercial Code (810 ILCS 5/2-725).

7. 7

   Illinois small claims, governed by Illinois Supreme Court Rules 281 through 289, hears claims up to $10,000, exclusive of interest and costs. Attorneys are allowed on either side, and Illinois's own mandatory small claims complaint form makes checking a box that payment was demanded optional, not a requirement.

Illinois Requirements for Demand Letter

• Bad-Check Demand Unlocks Treble Damages

  Under 720 ILCS 5/17-1(E), a written demand sent by both certified mail and first-class mail to the drawer's last known address, with 30 days to pay after delivery or an attempted delivery that was refused or unclaimed, is a condition of recovering the check amount plus treble damages, not less than $100 nor more than $1,500, plus attorney's fees and court costs.

• Bad-Check Demand Must Offer a Pre-Hearing Tender

  The written demand under 720 ILCS 5/17-1(E) must give the drawer notice that, before any hearing, the drawer may tender the check amount plus incurred court costs and attorney's fees, and the payee must accept that tender as full satisfaction of the claim.

• No General Attorney's-Fee Presentment Statute

  Illinois has no statute that ties presenting a claim and waiting out a deadline to a right to attorney's fees on an ordinary contract, open-account, or services claim. The Consumer Contract Reciprocal Attorney's Fees Act, 815 ILCS 604/10 and 604/15, instead lets a prevailing consumer defendant recover fees when a commercial party sues on a one-sided fee clause in a consumer contract and the principal amount claimed does not exceed the small-claims limit.

• Vehicle-Dealer and RISC-Holder Notice

  815 ILCS 505/10a(h) requires a party seeking relief against a new or used vehicle dealer or a retail installment contract holder to serve written notice of the alleged violation and a demand for relief at least 30 days before filing suit under the Consumer Fraud Act.

• No Threats to Accuse Someone of an Offense

  Illinois's criminal intimidation statute, 720 ILCS 5/12-6(a), makes it a Class 3 felony to threaten, without lawful authority, to accuse any person of an offense, or to threaten physical harm, unlawful confinement, or several other listed acts, in order to make someone perform or omit an act. A demand letter must never make that kind of threat.

• 2026 Collection Agency Act Narrowing

  Effective January 1, 2026, 205 ILCS 740/2 narrowed the definition of a regulated collection agency to generally exclude a creditor collecting its own debt under its own name, unless the creditor uses a fictitious name to simulate third-party involvement or sells or distributes demand-letter systems designed to create that impression.

• Ten-Year Written-Contract Limitations Period

  735 ILCS 5/13-206 gives 10 years to sue on a written contract. 735 ILCS 5/13-205 gives 5 years on an oral contract, an open account without a signed writing, or an injury to property, and 810 ILCS 5/2-725 gives 4 years on a contract for the sale of goods.

• Default 5 Percent Interest, Assignee Notice Rule

  815 ILCS 205/2 lets a creditor charge 5 percent per year on money due on a written instrument, an account stated, money lent, or money wrongfully withheld, running automatically once the amount becomes due, and 815 ILCS 205/4(1) allows a written contract to set a rate up to 9 percent. Absent an agreement between the creditor and debtor governing interest charges, when an assignee or agent rather than the original creditor is collecting, that section requires 30 days written notice to the debtor before the assignee or agent may charge and collect the interest.

• $10,000 Small Claims Limit, Demand Not Required

  Illinois small claims, governed by Illinois Supreme Court Rules 281 through 289, hears claims up to $10,000, exclusive of interest and costs, and allows attorneys on either side. Illinois's own mandatory small claims complaint form makes checking a box that payment was demanded optional, not a required representation.