To get a private investigator license in Illinois, you need at least three years of qualifying investigative experience within the past five years (or a combination of education and experience), plus a clean background check, a 20-hour training course, a passing score on the Class A PI exam, and a $1 million liability insurance policy. The Illinois Department of Financial and Professional Regulation (IDFPR) issues all PI licenses in the state.
Illinois maintains comparatively detailed licensing, insurance, and training requirements for private investigators, and that’s built a market where licensed PIs are taken seriously by attorneys, corporations, and insurance carriers alike. Chicago alone generates a steady stream of complex casework: corporate fraud, insurance investigations, asset searches, and domestic cases that require real investigative skill.
The Illinois Department of Financial and Professional Regulation (IDFPR) handles all PI licensing in the state through its online CORE system, which launched in October 2024. Here’s exactly what the process looks like from start to finish.
What Kind of Work Do Illinois PIs Actually Do?
Private investigators in Illinois work across a wide range of industries and case types. The bread-and-butter caseload includes insurance fraud investigations, domestic cases involving marital infidelity or child custody disputes, background checks for employers and attorneys, and surveillance work for civil litigation. Social media has made some of this work both easier and more interesting: it’s hard to claim a disabling back injury when your own Facebook page has photos from your weekend zip-lining trip.
Beyond the standard case types, Illinois PIs also do a significant amount of corporate work. Businesses hire investigators to look into employee theft, intellectual property violations, and internal fraud. Law firms bring in PIs to locate witnesses, serve process, and gather evidence for civil and criminal cases. Cyber investigations (tracing digital fraud, data breaches, and online harassment) are a growing specialty, particularly in the Chicago market. For a broader look at the types of work PIs handle nationally, see our private investigator careers overview.
Once licensed, you can work for an existing agency, go out on your own as a sole proprietor, form a partnership, or structure your business as a corporation or LLC. The PERC card (Permanent Employee Registration Card), described below, is the entry-level credential that lets you start building the experience you’ll need for full Class A licensure.
Step 1. Understanding Your Licensing Path in Illinois
Illinois has two main routes to a Class A Private Detective license, depending on how much qualifying experience you have and whether you’re coming in with a relevant degree. Before you get into the full application, it’s also worth understanding the PERC card, the credential that gets you in the door with a licensed agency. At the same time, you build experience toward full licensure.
The PERC Card: Your Entry-Level Credential
The Permanent Employee Registration Card (PERC) lets you work as a registered employee of a licensed private detective agency in Illinois. It’s not a full PI license, so you won’t be able to run your own cases independently, but it’s the standard starting point for people who don’t yet have three years of qualifying experience. You apply through the IDFPR’s CORE system, submit fingerprints for a background check, and pay the application fee. Once issued, your PERC is what allows you to start accumulating the experience hours that count toward a Class A license.
Class A License: The Two Application Routes
Once you have your experience and training in order, you apply for the Class A Private Detective license. Illinois allows you to qualify under either of these routes:
- Experience route: Three years of qualifying investigative experience within the past five years
- Education and experience route: A combination of post-secondary education and experience, where a relevant degree substitutes for one or two years of the experience requirement
Once licensed, you have the following options for how you practice:
- Work for another licensed private investigator or agency
- Operate as a sole proprietor
- Enter into a PI partnership
- Form a PI corporation
- Form a PI limited liability company (LLC)
Step 2. Qualifying for the PI Exam and License in Illinois
Qualifying Based on Experience
If you’re applying on experience alone, you need to show proof of three years of full-time investigative work out of the past five years in any of the following roles:
- As a full-time private detective (registered as a PERC employee of a licensed agency)
- As a full-time investigator for a federal, state, county, or city law enforcement department
- As a full-time investigator in a State’s Attorney’s or Public Defender’s office
- As a full-time investigator for an in-house investigative unit of a corporation with 100 or more employees
- Military police (must also submit DD Form 214)
Qualifying Based on Education and Experience
Education in a relevant field can substitute for part of the experience requirement. Here’s how it works:
| Degree | Field of Study | Experience Substitution |
|---|---|---|
| Associate’s degree | Law enforcement or related field | Substitutes for 1 year of required experience |
| Bachelor’s degree | Law enforcement, related field, or business | Substitutes for 2 years of required experience |
Relevant majors include criminal justice, psychology, forensics, law, business, and public administration. A degree won’t eliminate the experience requirement. You’ll still need at least one year of qualifying work, but education can significantly shorten the path to eligibility. See our guide to private investigator training programs for a full breakdown of credential types and what each one counts for.
Other Minimum Requirements
Regardless of which route you take, every applicant must also meet the following baseline requirements:
- Be at least 21 years old
- No felony convictions, or at least 10 years have passed since completing your sentence.
- Not be a registered sex offender
- Be of good moral character
- Meet Illinois eligibility standards related to professional fitness and lawful practice.
- Meet Illinois’s eligibility standards related to substance use under the Private Detective Act.
The felony conviction rule is worth understanding precisely: a conviction doesn’t automatically disqualify you permanently. The 10-year clock starts from the completion of your sentence, not the conviction date. If you have questions about how a specific conviction affects your eligibility, contact IDFPR directly before investing time in the application process.
Step 3. Private Investigator Training Requirements in Illinois
The 20-Hour Basic Training Course
Before you can work as a registered PI employee in Illinois, you need to complete a 20-hour basic training course administered by a qualified instructor. This must be completed before hire or within 30 days of starting work with a licensed agency. The course covers:
- Illinois laws and statutes
- Arrest and control techniques
- Identification of terrorists and terrorist organizations
- Use of force, including lethal and non-lethal force
- Public relations and civil rights
Within six months of employment, you’ll also need to complete an additional eight hours of training in a relevant subject area. Once completed, you’ll submit your basic training certification as part of your application record.
The Firearm Training Course
Carrying a firearm on the job is optional, but if you choose to do so (and you’re otherwise legally permitted to carry), you need to complete a qualified 48-hour firearm training course. The course includes:
- Classroom instruction covering:
- Law and the use of force
- Law, private police, and law enforcement reporting
- Fire prevention
- Range instruction covering:
- Combat shooting
- Double-action shooting
- Positioning
If you’ve already completed comparable firearms training through law enforcement or military service, you may be eligible to submit a waiver of firearms training.
Step 4. Submitting a Complete Application for Licensure in Illinois
Applications for the Class A Private Detective license are now submitted through IDFPR’s CORE online licensing system, which launched in October 2024. Along with your completed application (filed under either the experience route or the education and experience route), you’ll need to submit the following to IDFPR:
- Criminal background check
- Fingerprints and authorization for a background check with the Illinois State Police
- Proof of a $1 million liability insurance policy
- $298 examination fee
- Licensure fee (you’ll be notified of this amount once your application is approved)
If you’re planning to carry a firearm, also include either your firearm training certification or a waiver if you’ve completed comparable prior training.
Step 5. Taking the Illinois PI Exam
Continental Testing Services administers the Illinois Class A Private Detective exam. You can register for it through the CORE portal as part of your application, or you can register directly through the CTS State of Illinois examinations page. The exam is offered twice a year and tests your knowledge across:
- State and federal laws
- Practice and licensing requirements
- Analysis, presentation, and reporting
- Case management
- Gathering evidence and information
Continental Testing provides a practice test and study guide for the Class A exam. You should also be familiar with the Illinois statutes that govern PI practice:
- 225 ILCS 447: the Private Detective, Private Alarm, Private Security, Fingerprint Vendor, and Locksmith Act of 2004
- Administrative Code Title 68, Chapter VII, Subchapter b, Part 1240, sections 1240.10 and 1240.20
Step 6. Working as a Private Detective in Illinois
Your Class A Private Detective license expires on May 31st every three years. Renewal is handled through the IDFPR online portal. To renew, you need to complete 8 hours of continuing education per year in a relevant subject area (verify the current cycle-based total with IDFPR, as CE obligations are defined per renewal period) and maintain your good moral character—failure to renew before the deadline requires a reinstatement application rather than a standard renewal.
Professional associations are worth joining early. The Associated Detectives and Security Agencies of Illinois (ADSAI) is the primary state-level organization for Illinois PIs: a solid source for legal updates, networking, and practical guidance from experienced investigators.
Chicago represents Illinois’ largest market for private investigative services, but investigators throughout the state — in Aurora, Rockford, Joliet, and Springfield — find steady work in the cases that drive most of the industry: insurance fraud, domestic investigations, background checks, and civil litigation support.
Private Investigator Salary in Illinois
According to the Bureau of Labor Statistics, private investigators in Illinois earned a median annual salary of $73,070 as of May 2024. The mean annual salary was $71,380; top earners at the 90th percentile brought in $98,800 or more. Illinois employs approximately 1,770 licensed PIs statewide.
On the job growth side, BLS projections for Illinois show a 3.7% increase in PI employment between 2022 and 2032, with an average of roughly 180 job openings per year. That’s a stable market: not explosive, but steady, reflecting consistent demand for investigative services across insurance, legal, and corporate sectors. For national salary comparisons across all states, see the private investigator salary page.
Private Investigator Salaries in Chicago
The Chicago-Naperville-Elgin metro area is the state’s primary PI market, with approximately 1,320 investigators employed as of May 2024. Pay runs slightly higher than the statewide figures across every earnings level.
| Geography | Median Annual Salary | Mean Annual Salary | 90th Percentile | Employment |
|---|---|---|---|---|
| Illinois (statewide) | $73,070 | $71,380 | $98,800 | 1,770 |
| Chicago-Naperville-Elgin metro | $77,680 | $74,840 | $99,500 | 1,320 |
Frequently Asked Questions
Do I need a PERC card before applying for a Class A PI license in Illinois?
Not necessarily — the PERC card is required only if you’re going to work as an employee of a licensed PI agency while building experience. If you already have three years of qualifying investigative experience (from law enforcement, the military, or a prior PI position), you can apply directly for the Class A license without obtaining a PERC first.
Can a felony conviction disqualify me from getting a PI license in Illinois?
A felony conviction is a potential disqualifier, but not automatically a permanent one. If at least 10 years have passed since you completed your sentence (including any parole or probation), you may still be eligible. Illinois also bars registered sex offenders from licensure with no exception. If you have a conviction in your history, contact IDFPR before starting the application process to get a clear picture of your eligibility.
How often is the Illinois Class A PI exam offered, and what does it cover?
Continental Testing Services administers the exam twice a year. It covers Illinois and federal law, PI practice and licensing requirements, evidence gathering, case management, and analysis and reporting. Continental Testing provides a study guide and practice test. Familiarity with 225 ILCS 447 and the relevant sections of Title 68 of the Administrative Code is essential preparation.
What are the continuing education requirements for renewing a PI license in Illinois?
Illinois requires eight hours of continuing education per year in a subject area relevant to PI work. However, the specific cycle-based total should be verified directly with IDFPR before your renewal. Your license renews on a three-year cycle, expiring May 31st of the renewal year. You must also maintain your good moral character standing. If your license lapses past the renewal window, you’ll need to apply for reinstatement rather than standard renewal.
What does a private investigator in Illinois typically earn?
BLS data for May 2024 shows a median annual salary of $73,070 for Illinois PIs, with the Chicago metro running slightly higher at $77,680. Top earners at the 90th percentile reach $98,800 or more statewide. Earnings tend to be higher for investigators with specialized expertise in corporate fraud, cyber investigations, and legal support work.
Key Takeaways
- Two paths to licensure: You can qualify on experience alone (3 years in 5) or combine a relevant degree with experience to shorten the required work history.
- PERC card first: If you don’t yet have qualifying experience, a PERC card lets you work under a licensed agency while you build toward Class A eligibility.
- Training is required: A 20-hour basic training course must be completed before or within 30 days of starting work, with an additional 8 hours due within six months.
- Applications go through CORE: IDFPR launched its new online licensing system in October 2024. All new applications are processed there.
- Renewal every three years: Your license expires on May 31st, every three years. Illinois requires continuing education for renewal. Verify the current CE total with IDFPR before your renewal date.
- Illinois pays above the national median: Statewide median salary is $73,070 (May 2024 BLS data), with Chicago-area investigators earning a median of $77,680.
Ready to start your PI career in Illinois? Find accredited criminal justice and law enforcement programs that can shorten your path to licensure.
May 2024 US Bureau of Labor Statistics salary and job market figures for Private Detectives and Investigators reflect state and national data, not school-specific information. Conditions in your area may vary. Data accessed May 2026.