Illinois IDES Unemployment Insurance Employer Audit Protest

The situation

Roberto, 48, owns Chicago Green Clean LLC, a commercial janitorial services business in the Chicago suburbs with $1.6M annual revenue, 6 full-time W-2 employees, and 22 independent contractor cleaning crews. In January 2026 Roberto received an IDES Notice of Determination and Assessment: "Unemployment Insurance Contributions: $67,200 (plus $13,440 penalty + $5,040 interest = $85,680 total), audit period: Q1 2023 – Q4 2025."

IDES has reclassified all 22 of Roberto's independent contractor cleaning crews as employees for UI purposes, assessing back contributions on three years of their earnings.

Roberto has 20 calendar days from the mailing date to file a written protest.

(a) The 20-day deadline is absolute. Missing it by even one day makes the $85,680 assessment final and immediately due. Roberto's wife saw the NDA in the mail and set it aside for a week, thinking it was "just another government notice." Roberto now has 13 days.

(b) About 8 of his 22 ICs are probably legitimately defensible. Roberto's cleaning crews can be divided into: (i) 8 "enterprise subs", these are cleaning companies with their own business licenses, their own equipment, and multiple commercial cleaning clients besides Roberto. They set their own schedules and have written IC agreements with Roberto. These 8 almost certainly pass all three IDES IC test factors; (ii) 14 "individual worker crews", these are individuals who work exclusively for Roberto, use his cleaning supplies, and are dispatched to sites by Roberto's dispatcher. IDES's classification of these 14 as employees is probably correct. Roberto should concede the 14 and contest the 8.

(c) Contesting the 8 enterprise subs reduces his exposure by ~$25,000. The 8 enterprise subs represent roughly $625,000 in 1099 payments over 3 years at Roberto's average sub rates. Back UI contributions on $625,000 in wages = ~$18,750 at Illinois's average 2.7% contribution rate, before penalties and interest. Even if Roberto's protest only partially succeeds, he could reduce his total liability by 30-40%.

(d) Wessels Sherman quoted Roberto $5,500 for "protest letter and IDES hearing representation." The 3-factor IC test analysis for 8 worker categories, applied to the specific facts Roberto can document (own LLC, own equipment, multiple clients, no exclusivity), is largely self-executable with the right Illinois-specific framework.

Second portrait: Jennifer, 36, owns Midwest Tech Staffing LLC, a Chicago technology staffing business placing software developers and DevOps engineers on project-based contracts ($3.1M revenue, all 1099 workers). She received an IDES NDA for $112,000 in back UI contributions.

What Jennifer doesn't know: Her tech contractors work on-site at client locations, use client-provided equipment, have client-controlled hours, and cannot substitute other workers without client approval, these are some of the strongest EMPLOYEE indicators under the IDES behavioral control factor. The contractual language (calling them "independent contractors") is irrelevant to IDES's analysis. HOWEVER: several of her contractors have their own C-corps or LLCs (the "enterprise" arrangement), have their own other clients, and negotiated their own project rates, these are the ones worth contesting. Jennifer needs to identify WHICH contractors can pass the 3-factor test and concede the others.

Who receives this

Illinois employers receiving IDES Notices of Determination and Assessment for worker misclassification. Primary segments: (1) Illinois commercial cleaning, janitorial, and building services businesses (2) Illinois technology staffing and IT services companies (3) Illinois construction contractors and subcontractors, the "Employee Classification Act" (ECA, 820 ILCS 185) creates a separate misclassification presumption in construction that IDES enforcement piggybacks on (4) Illinois home health aide and personal care services companies. Secondary: any Illinois business with a significant 1099 workforce receiving an IDES audit.

Why the agency will not advise you

IDES cannot advise employers on how to contest its own NDA, the IDES Employer FAQs describe protest rights without protest strategy. Wessels Sherman's multiple dedicated IDES audit pages confirm a well-established attorney market with no self-serve competitor. The IDES 3-factor IC test (not ABC test) creates a structured, codifiable analysis that produces strong IC defenders vs. clear employee concessions.

Key facts, with sources

• When IDES concludes an employer audit and issues a Notice of Determination and Assessment (NDA) for UI contributions on misclassified workers, the employer has exactly 20 calendar days from the mailing date to file a timely written protest. Missing the 20-day deadline causes the NDA to become final and immediately due, ALL appeal rights are permanently lost, including the right to go to the IDES Board of Review or Circuit Court. A timely filed protest triggers IDES to schedule an administrative hearing before a Board of Review referee. The IDES Board of Review (20 ILCS 2505/2500-50) is the Illinois appellate body for UI determinations, while technically within the IDES structure, the Board of Review is an independent appellate decision-making body whose decisions can be further appealed to the Illinois Circuit Court under the Illinois Administrative Review Law. 'IDES Audits: Don't Handle an Illinois Department of Employment Security Audit Without Careful Planning!' per Wessels Sherman, labor and employment attorneys, confirms the severity of the 20-day deadline. Source: IDES Notice of Determination & Assessment: Five Top Questions Illinois Companies Ask About Protesting It! — Wessels Sherman · Help for Employers and Their Advisors in Protesting the IDES Determination and Assessment — Wessels Sherman · Employee Misclassification — IDES Illinois.gov
• Illinois uses a multi-factor common law test to determine whether a worker is an employee or independent contractor for IDES purposes, Illinois has NOT adopted the ABC test used by California (AB 5), Massachusetts, or New Jersey. The Illinois Supreme Court has articulated that the key factors are: (1) Behavioral control, does the company control how the work is done, not just what work is done? Does the company provide training, set hours, require specific methods? (2) Financial control, does the worker have a significant investment in tools and equipment, an opportunity for profit or loss, services available to the general market, and is the worker paid by the job rather than hourly? (3) Type of relationship, is there a written independent contractor agreement? Does the worker receive employee benefits? Is the relationship permanent or for a specific project? IDES presumes that any worker receiving a 1099-NEC is a potential employee, the EMPLOYER bears the burden of proof that IC status is appropriate. IDES uses IRS 1099-NEC data cross-referencing to identify employers with large numbers of 1099 contractors for audit targeting. In 2025, IDES identified 'construction, healthcare, transportation, and technology services' as primary misclassification audit targets. Source: Why it is a Good Idea to Protest and Appeal an IDES Audit Determination and Assessment if it Involves an Independent Contractor Classification Issue — Wessels Sherman · Avoiding IDES Audits: The Importance of Proper Worker Classification in Illinois — Jackson LLP · Rules of the Illinois Department of Employment Security

When to bring in a professional

Self-serve responses fit routine cases: clear facts, amounts a business can absorb, and a deadline still ahead of you. Bring in a licensed professional when the amount at stake is large relative to their fee, the facts are genuinely disputed, criminal exposure is possible, or the deadline has already passed. A short paid consultation to sanity-check your plan is often worth it even when you handle the filing yourself.

All sources for this guide

1. IDES Notice of Determination & Assessment: Five Top Questions Illinois Companies Ask About Protesting It! — Wessels Sherman
2. Help for Employers and Their Advisors in Protesting the IDES Determination and Assessment — Wessels Sherman
3. Employee Misclassification — IDES Illinois.gov
4. Why it is a Good Idea to Protest and Appeal an IDES Audit Determination and Assessment if it Involves an Independent Contractor Classification Issue — Wessels Sherman
5. Avoiding IDES Audits: The Importance of Proper Worker Classification in Illinois — Jackson LLP
6. Rules of the Illinois Department of Employment Security