A group health plan in Illinois is health insurance coverage that an employer buys and maintains for its employees, with the employer — not the employee — standing as the policyholder. Federal rules draw the boundary: 45 CFR 144.103 defines the “Group market” as “the market for health insurance coverage offered in connection with a group health plan,” and the “Small group market” as the market “under which individuals obtain health insurance coverage (directly or through any arrangement) on behalf of themselves (and their dependents) through a group health plan maintained by a small employer.” The part that is genuinely an Illinois question, rather than a national one, is where Illinois draws the line around small employer. Illinois does not draw it at one.
The Illinois small-employer band starts at two, and it is tested twice
The definition sits at 215 ILCS 97/5, in the Illinois Health Insurance Portability and Accountability Act, and it reads:
“‘Small employer’ means, in connection with a group health plan with respect to a calendar year and a plan year, an employer who employed an average of at least 2 but not more than 50 employees on business days during the preceding calendar year and who employs at least 2 employees on the first day of the plan year.”
Two conditions, measured at two different moments. The first looks backward across the preceding calendar year and asks for an average. The second looks at a single day — the first day of the plan year — and asks for a headcount then. An employer has to clear both.
The practical consequence is the one most often missed. A sole proprietor with nobody else on the payroll does not meet either limb. An owner-plus-nobody business does not become a group by calling itself one. And a business that shrank to a single employee during the prior year can fail the backward-looking test even if it has staffed back up by the time it applies. The source line on this definition is recent — P.A. 104-533, effective 6-26-26 — so a summary written from an older copy of the Act is not a safe substitute for the current text.
Who gets counted alongside you
The same definition carries three attached counting rules, and each one changes the answer for a real Illinois business.
First, common control. All persons treated as a single employer under subsections (b), (c), (m) or (o) of Section 414 of the Internal Revenue Code of 1986 are treated as one employer. Two Illinois entities with the same ownership are not automatically two separate small groups.
Second, new businesses. An employer that was not in existence throughout the preceding calendar year is measured by the average number of employees it is reasonably expected to employ on business days in the current calendar year. A business founded in the spring is not locked out for lack of a prior-year average.
Third, predecessors. A reference to a small employer includes any predecessor of that employer, so a reorganization does not reset the count.
Illinois does not require a private employer to offer coverage, and here is what that rests on
This is a negative, and a negative deserves the same evidence as a positive. The full text of 215 ILCS 5, Article XX — the accident-and-health article of the Illinois Insurance Code — was pulled in one document and parsed rather than sampled. Sentences mentioning an employer together with shall, must or is required to were isolated, and then narrowed to the ones where the employer is actually the subject of the duty. Every survivor concerned forwarding a copy of a continuation-of-coverage notice to the insurer. The Article’s duties run overwhelmingly to insurers and to policies, not to the businesses that buy them.
A second sweep read the complete act-title listing of Chapter 820, the Illinois employment chapter. No Act there imposes a duty to offer health coverage. Illinois does mandate other employer obligations in that chapter — paid leave, a transportation benefits program, a retirement savings facilitation program — which is exactly why the health-coverage negative has to be stated narrowly rather than as “Illinois requires nothing of employers.”
The scope limit is worth stating plainly: that conclusion rests on Article XX plus the Chapter 820 act-title listing, not on a full-text search of every chapter of the Illinois Compiled Statutes.
One of those other programs is the most common source of confusion. The Illinois Secure Choice Savings Program Act, 820 ILCS 80, does place a real duty on qualifying Illinois employers — but it is a retirement auto-IRA facilitation duty. The entire body of that Act was swept for “health insurance,” “health coverage,” “health benefit,” “medical” and the bare word “health,” and every count was zero. It is not evidence that Illinois mandates employee health benefits, and it should never be cited as if it were.
An Illinois employer duty that does exist, and who it reaches
There is a genuine Illinois statute that orders an employer to fund health coverage, and small private employers are not its audience. 820 ILCS 320/10, in the Public Safety Employee Benefits Act, provides that an employer of a full-time law enforcement, correctional or correctional probation officer, or firefighter, who suffers a catastrophic injury or is killed in the line of duty, “shall pay the entire premium of the employer’s health insurance plan” for the injured employee, that employee’s spouse, and each dependent child. The duty is contingent on a triggering event, and it reaches public-safety employers.
It is included here because the careless version of the sentence above — “Illinois does not require any employer to provide health coverage” — is false in Illinois. The accurate version names the employer type.
The duty that begins the day you do offer
This is the Illinois fact a first-time buyer most needs, and it is easy to miss because it lives outside the Insurance Code entirely.
820 ILCS 46/10(a), the Consumer Coverage Disclosure Act, provides that “an employer that provides group health insurance coverage to its employees shall, upon hire, annually thereafter, and upon request from an employee, provide all employees eligible for the coverage a written list of the covered benefits included in the group health insurance coverage in a format that easily compares those covered benefits with the essential health insurance benefits required of individual health insurance coverage regulated by the State of Illinois.” Its source line is P.A. 102-630, effective 8-27-21.
Read the shape of it. Illinois does not make you offer coverage — but the moment you do, it makes you hand every eligible employee a benefit-by-benefit comparison against the state’s essential-health-benefit list, on hire, every year, and on request. The Act defines employer to include the State, State officers, departments and agencies, units of local government and school districts, so public bodies carry it too. It is enforced by the Illinois Department of Labor, not the Department of Insurance, and penalties under the Act scale with employer size. Section 10(b) puts the Department of Insurance in the supporting role of supplying the comparison information.
What has to be inside the policy once it is Illinois small-group coverage
Federal rules set the floor. 45 CFR 147.150 requires that an issuer offering coverage in the individual or small group market “must ensure that such coverage includes the essential health benefits package.” 45 CFR 156.110 lists the benefit categories that package is built from: ambulatory patient services; emergency services; hospitalization; maternity and newborn care; mental health and substance use disorder services, including behavioral health treatment; prescription drugs; rehabilitative and habilitative services and devices; laboratory services; preventive and wellness services and chronic disease management; and pediatric services, including oral and vision care. The same section adds a balance rule — benefits must not be “unduly weighted toward any category.”
Bronze, silver, gold and platinum sit on top of that floor and are frequently misread as quality grades. They are not. Under 45 CFR 156.140, actuarial value “determines whether a health plan offers a bronze, silver, gold, or platinum level of coverage” — the label describes the share of expected covered costs the plan design carries, with the balance falling to the member through cost-sharing. Two plans in the same tier can have very different networks.
Illinois then writes a further body of coverage duties into fully insured policies on top of the federal floor, and that body is large enough, and gated finely enough, that it needs its own page. The state’s own benchmark plan — the reference point the disclosure statute above compares against — is a small-group PPO product, with pediatric dental and pediatric vision supplemented from other federal programs.
Fully insured, level funded, and why that choice lands harder in Illinois
In a fully insured arrangement the issuer carries the claims risk, and the coverage is subject to the small group market’s federal requirements — essential health benefits, guaranteed renewability, and the single risk pool. In a self-funded arrangement the employer carries claims risk and pays claims from its own funds, usually contracting administration and network access to a third-party administrator.
Level funding sits between them in appearance and on the self-funded side in substance. Federal agencies describing it in a 2023 proposed rule called it “a type of self-funded arrangement in which the plan sponsor makes set monthly payments to a service provider to cover estimated claims costs, administrative costs, and premiums for stop-loss insurance for claims that surpass a maximum dollar amount beyond which the plan sponsor is no longer responsible for paying claims (attachment point).” A year under budget may produce a refund or a surplus carried forward; a year over budget may push the next year’s payments up.
The consequence the agencies flagged is the one to carry into an Illinois decision: “if the entire arrangement is treated as self-insured, the essential health benefit requirements would not apply,” and small employers moving into these arrangements “may be unaware that the self-funded plans they are offering to their employees may not include certain benefits that would have to be covered if the plan were fully-insured.” That description is citable as a description — the 2024 final rule expressly declined to address level-funded arrangements, so none of it is a rule. But in a state that writes as many benefit duties into fully insured policies as Illinois does, the gap between the two arrangements is wider than the monthly-payment resemblance suggests.
Where an Illinois employer buys, and what the state marketplace does not say
Illinois runs its own exchange rather than relying on the federal one. The statutory basis is 215 ILCS 122, the Illinois Health Benefits Exchange Law, and 215 ILCS 122/5-5 directs that “the Department of Insurance shall operate the Illinois Health Benefits Exchange as a State-based exchange using the federal platform by plan year 2025 and as a State-based exchange by plan year 2026.”
The exchange operates publicly as Get Covered Illinois, and it sits inside the Illinois Department of Insurance itself, run by a State-Based Marketplace Director within the Department.
On the small-employer side the honest answer is that it is unstated. The same statutory section makes a small-employer channel permissive — the Director “may elect to add a small business health options program to the Illinois Health Benefits Exchange” — which establishes a power, not a program. A sweep of three Get Covered Illinois pages, including the homepage and the broker page, returned zero occurrences of “small employer,” “small business” and “employer.” Absence across three pages is not an affirmative statement of closure, and no page was found saying either way. Federally, a small-business channel is not one national program in any case: an exchange may be established and operated by a state or by the federal government, so whether one exists, who runs it, and how it works are state-level questions.
That is a reason to treat the Illinois small-group market as a market you shop, rather than a portal you log into.
Making employee contributions pre-tax
One piece of paperwork changes the tax treatment of what employees pay toward the plan. Under IRS Publication 15-B, a cafeteria plan “is a written plan that allows your employees to choose between receiving cash or taxable benefits, instead of certain qualified benefits for which the law provides an exclusion from wages,” and accident and health benefits are an allowed qualified benefit. Without that written plan document in place, employee premium contributions come out after tax; with one, they can come out pre-tax. It is a concrete document the employer either has or does not have, and it is worth settling at setup rather than discovering at the first payroll run.
The bottom line
In Illinois a group health plan is employer-held coverage, and the state’s small-employer band starts at two employees — tested once over the prior year and again on the first day of the plan year. Illinois does not make a private employer offer coverage, but the moment you do, a separate Illinois statute makes you explain it, in writing, to every eligible employee.
Frequently asked questions
Can a one-person business buy a group health plan in Illinois?
Not under the Illinois small-employer definition. 215 ILCS 97/5 defines a small employer as one “who employed an average of at least 2 but not more than 50 employees on business days during the preceding calendar year and who employs at least 2 employees on the first day of the plan year.” Both limbs have a floor of two, so a sole proprietor with no employees, or an owner who is the only person on the payroll, does not meet the definition. Illinois does not start at one, and that is worth checking before anything else in the process. The same definition section also explains who gets counted alongside you — entities under common control are treated as one employer, and a predecessor business counts.
Does Illinois law require an employer to offer health insurance?
No Illinois statute found in our own retrieval imposes that duty on a private employer. That negative was established by reading rather than assumed: the full text of 215 ILCS 5, Article XX was pulled and parsed, and every sentence in which an employer was the subject of a duty turned out to concern forwarding a continuation-of-coverage notice to the insurer. The Article’s duties run to insurers and to policies. The complete act-title listing of Chapter 820, the Illinois employment chapter, was read as well, and no Act there imposes a duty to offer health coverage. The scope limit is honest: this rests on Article XX plus that chapter listing, not on a full-text search of every ILCS chapter. Public-sector employers are a separate question with a different answer.
What is Get Covered Illinois, and can a small employer use it?
Get Covered Illinois is the public name of the Illinois Health Benefits Exchange, whose statutory basis is 215 ILCS 122 and which sits inside the Illinois Department of Insurance, run by a State-Based Marketplace Director within the Department. 215 ILCS 122/5-5 directs that the Department “shall operate the Illinois Health Benefits Exchange as a State-based exchange using the federal platform by plan year 2025 and as a State-based exchange by plan year 2026.” On the small-employer question the honest answer is that we do not know: the statute makes a small-employer channel permissive rather than mandatory, and three marketplace pages were swept without a single occurrence of “small employer,” “small business” or “employer.” Absence across three pages is not a statement of closure, so we write neither that the channel exists nor that it is closed.
What does an Illinois employer have to give employees once coverage is in place?
A written benefit list, in a comparable format, at three separate moments. 820 ILCS 46/10(a), the Consumer Coverage Disclosure Act, requires an employer that provides group health insurance coverage to give all eligible employees “a written list of the covered benefits included in the group health insurance coverage in a format that easily compares those covered benefits with the essential health insurance benefits required of individual health insurance coverage regulated by the State of Illinois” — upon hire, annually thereafter, and upon an employee’s request. The duty is contingent: it is triggered by offering, not by failing to offer. It is enforced by the Illinois Department of Labor rather than the Department of Insurance, and the Department of Insurance supplies the comparison information the employer works from.
Does a level-funded plan have to cover the same things as a fully insured Illinois plan?
Possibly not, and that is the single most consequential thing to understand before choosing one. Federal agencies describing the arrangement in a 2023 proposed rule wrote that level-funding is “a type of self-funded arrangement in which the plan sponsor makes set monthly payments to a service provider to cover estimated claims costs, administrative costs, and premiums for stop-loss insurance,” and that “if the entire arrangement is treated as self-insured, the essential health benefit requirements would not apply.” The agencies added that small employers moving into these arrangements “may be unaware that the self-funded plans they are offering to their employees may not include certain benefits that would have to be covered if the plan were fully-insured.” That is a description of how the arrangement works, not a rule — the 2024 final rule expressly did not address level-funding. In Illinois it matters more than the sentence suggests, because the state writes a large body of benefit duties into fully insured policies.
About the author
Nate Jones, CPCU, is the founder of Wexford Insurance and Wexford Health Insurance, an independent agency placing small-business group benefits in 9 states. He works with Illinois employers setting up a first group health plan, where the opening question is usually whether the business clears the state’s two-employee floor at all. Start with the Wexford Health Insurance quote form.