Non-Solicitation Agreements in Illinois: Enforceability Rules

Federal law does not directly regulate non-solicitation agreements. The Defend Trade Secrets Act (18 U.S.C. § 1836) provides a federal cause of action for misappropriation of trade secrets but relies on state law definitions of what constitutes a trade secret and what restrictive covenants are reasonable. The National Labor Relations Board (NLRB) has jurisdiction over non-solicitation provisions that implicate employee organizing rights under the National Labor Relations Act (29 U.S.C. § 151 et seq.), and may invalidate overly broad non-solicitation agreements that chill protected concerted activity.

Under federal law, non-solicitation agreements are not per se illegal and are enforceable if reasonable. However, the NLRB has found that non-solicitation provisions that prevent employees from discussing wages, hours, or working conditions with coworkers, or that bar employees from soliciting each other for union activity, violate the NLRA. The EEOC does not regulate non-solicitation agreements directly, but may challenge them if they are applied discriminatorily based on protected characteristics. Federal courts apply state law to determine enforceability but may impose additional restrictions based on federal policy.

Illinois law governs non-solicitation agreements through the Illinois Uniform Trade Secrets Act (815 ILCS 5/2) and the Restrictive Covenant Act (740 ILCS 140/2). Unlike some states, Illinois does not prohibit non-solicitation agreements outright. Instead, Illinois courts apply a three-part reasonableness test established in Harper v. Finnegan, Ziegler & Stichter, P.C. (945 N.E.2d 1011): (1) the employer must have a legitimate business interest, (2) the restriction must be reasonable in scope and geographic area, and (3) the duration must be reasonable in relation to the employer's interest.

Illinois distinguishes between non-solicitation and non-compete agreements. Non-solicitation agreements restrict an employee from soliciting customers or other employees but do not prevent the employee from working for a competitor or soliciting business generally. This distinction is important because Illinois applies stricter scrutiny to non-compete agreements (governed by 740 ILCS 140/2, which requires a legitimate non-competition interest) than to non-solicitation agreements, which only require protection of trade secrets or customer relationships.

Legitimate business interests in Illinois include: protection of trade secrets, protection of substantial relationships with specific prospective or existing customers, and protection of other legitimate business interests. The customer relationship must be "substantial," meaning the employer must demonstrate genuine, ongoing business dealings with identifiable customers, not merely general market presence. Non-solicitation agreements are enforceable against employees but courts scrutinize agreements that restrict solicitation of prospective customers more strictly than those protecting existing customers.

Geographic scope must be limited to areas where the employer actually conducts business or has customer relationships. Unlimited geographic restrictions are typically unenforceable. Duration is typically reasonable if limited to 1-3 years depending on industry and customer relationship stability. Illinois applies these standards to employee non-solicitation (preventing departing employees from recruiting other staff) as well as customer non-solicitation. Employee non-solicitation is often easier to enforce than customer non-solicitation because courts recognize the employer's interest in protecting its workforce stability.

Non-solicitation agreements are unenforceable in Illinois if they: (1) are unreasonably broad in scope or duration, (2) lack a legitimate business interest, (3) attempt to prevent an employee from lawfully engaging in a profession or trade, (4) conflict with protected rights under the National Labor Relations Act (NLRA), or (5) violate public policy.

An overly broad non-solicitation clause—for example, one that prevents an employee from accepting business from any potential customer nationwide for five years—will be unenforceable because it goes beyond protecting legitimate business interests and effectively prevents the employee from competing. Illinois courts generally will not sever or blue-pencil overly broad restrictions; instead, they declare the entire clause unenforceable.

The NLRB has authority to invalidate non-solicitation agreements that violate Section 7 of the NLRA, which protects employee rights to organize and engage in concerted activity. A clause prohibiting employees from soliciting each other about union activity, or restricting discussion of wages and working conditions with coworkers, is likely unenforceable under federal law even if it would satisfy Illinois state law reasonableness standards.

Non-solicitation agreements are generally enforceable against employees who had access to customer information or trade secrets, but Illinois courts look closely at whether the "information" actually constitutes protectable trade secrets. Merely knowing a customer's name or basic business needs may not qualify as confidential information deserving legal protection.

Employee non-solicitation agreements may be unenforceable if they are so broad they effectively prevent the employee from competitive employment. For example, an agreement prohibiting the employee from working for any employer in the same industry or geographic region, even in a non-solicitation context, may be struck down as a disguised non-compete.

At-will employment does not insulate an employer from enforcement issues. Even in an at-will relationship, a non-solicitation agreement is enforceable only if it is reasonable. Conversely, the existence of a non-solicitation agreement does not change an employee's at-will status.

STEP 1: DOCUMENT THE VIOLATION. Maintain detailed records of any contact with former employer's customers, employees, or prospects, with dates, names, and substance of communications. Preserve emails, text messages, phone records, and customer lists showing business development activity. Document your job title, access to customer information, and the scope of your customer relationships before departure. Keep records of your current employment and non-competing business activities. Photograph or screenshot the non-solicitation agreement itself, including any modifications or acknowledgments. Create a timeline showing when you received the agreement, when you signed it, and when you left the employer.

STEP 2: INTERNAL COMPLAINT AND ASSESSMENT. If still employed, report concerns about the non-solicitation agreement's enforceability to HR, citing specific language you believe is unreasonable. Request a written explanation of the agreement's scope and duration. Do not violate the agreement while employed. If the agreement was presented as a condition of employment or promotion without negotiation, document this context. After departure, immediately consult an attorney to assess whether the agreement is enforceable under Illinois law. Your attorney will evaluate whether it meets the three-part reasonableness test: legitimate business interest, reasonable scope and geography, and reasonable duration.

STEP 3: DETERMINE WHETHER TO FILE A CHARGE OR SEEK DECLARATORY JUDGMENT. Illinois does not have a state agency that pre-screens non-solicitation enforceability (unlike some restrictive covenant agencies). Instead, you have two paths: (A) Wait for the employer to sue for breach and defend the action (filing an affirmative defense of unreasonableness), or (B) File a lawsuit seeking declaratory judgment that the agreement is unenforceable. Declaratory judgment is available through Illinois state courts (Circuit Court in the county where the employment occurred or where the employer is located). Your attorney will file a Complaint for Declaratory Judgment naming the employer as defendant. There is no filing deadline for seeking declaratory judgment, but do not continue soliciting if the agreement is likely enforceable, as delay may suggest bad faith. Include in your complaint allegations that: the agreement is unreasonable in scope, duration, or geography; it lacks a legitimate business interest; or it violates public policy or the NLRA.

STEP 4: UNDERSTAND THE LITIGATION PROCESS. The case will proceed through Illinois civil court. Discovery will take 6-12 months. The employer will submit evidence of its legitimate business interests (customer lists, revenue data, trade secret information, relationship stability). You will submit evidence that the restriction is overly broad (geographic scope exceeding actual business operations, duration exceeding industry norms, lack of genuine customer relationships). Illinois courts apply the Harper reasonableness standard. Expert testimony on industry customs regarding non-solicitation agreements may be permitted. Expect motion practice; the employer may file a Motion to Dismiss arguing the agreement is facially reasonable, which you will oppose. The case will likely be resolved through summary judgment (if the law is clear) or trial (if facts are disputed).

STEP 5: CONSULT AN EMPLOYMENT ATTORNEY. Contact a licensed Illinois employment attorney before signing or immediately after receiving a non-solicitation agreement. An employment law specialist will: (A) Review the specific language for enforceability under the Harper test, (B) Advise whether the agreement prevents lawful competitive employment, (C) Estimate litigation cost and risk if the employer sues, (D) Negotiate modification or waiver with the employer if appropriate, (E) Represent you in declaratory judgment action or defend you if sued. Your attorney may also identify whether the NLRA or other federal law provides additional protections. Litigation in Illinois state court for non-solicitation disputes typically costs $5,000-$25,000+ depending on complexity and whether trial is necessary. Attorney consultation usually costs $200-$400 per hour.