Small Business Health Insurance in Illinois: Rules and Costs

Medically reviewed by Jawad Arshad, MD, FACEP. Last reviewed: September 30, 2026.

Small business health insurance in Illinois is a group plan an employer offers to its employees, and the state treats a company with 2 to 50 employees as a small employer. Prices are rising for 2027, so owners should compare options before renewal. This guide covers the Illinois rules, real cost data, and one way to cut what the plan costs your payroll.

Key facts

• Illinois defines a small employer as one with an average of at least 2 but not more than 50 employees (215 ILCS 97/5, Illinois Small Employer Health Insurance Rating Act).
• Firms with 10 to 199 workers paid an average $9,211 for single coverage and $26,054 for family coverage in 2025 (KFF Employer Health Benefits Survey, 2025).
• Only 59% of firms with 10 to 199 workers offered health benefits in 2025, compared with 97% of firms with 200 or more workers (KFF, 2025).
• Illinois insurers' preliminary 2027 filings average +15.4% for the small group market (Illinois Department of Insurance filings, summarized by ACASignups.net, June 2026).
• Illinois continuation coverage lasts up to 12 months for employees of groups not covered by federal COBRA (Illinois Department of Insurance, continuation rights fact sheet).
• Get Covered Illinois became the state's own health insurance marketplace on November 1, 2025 (Illinois Department of Healthcare and Family Services, 2025).

What is small business health insurance in Illinois?

Small business health insurance in Illinois is group medical coverage that an employer sponsors for its employees. The employer picks the plan, pays part of the premium, and the employees pay the rest. Illinois treats an employer with 2 to 50 employees as small, and a Section 125 plan can lower the payroll tax on the employee share.

Illinois law sets the size of a small employer. Under the Illinois Small Employer Health Insurance Rating Act (215 ILCS 97/5), a small employer averaged at least 2 but not more than 50 employees during the prior calendar year and has at least 2 employees on the first day of the plan year. An owner with no employees does not qualify for a small group plan. That owner buys individual coverage, and Illinois now runs that marketplace as Get Covered Illinois (Illinois Department of Healthcare and Family Services, 2025).

Illinois small employers have three main routes. A traditional fully insured group plan is the most common. A level-funded plan is a lower-cost option for healthier groups, explained in our level-funded health plan guide. An individual coverage HRA lets employees shop for their own plan, covered in our ICHRA guide. Summit Health Benefits also publishes an Illinois small business health benefits page and a national small business health insurance overview for owners who want the short version.

Do Illinois small businesses have to offer health insurance?

No. A small Illinois business is not required to offer health insurance unless it reaches the federal threshold for an applicable large employer. That threshold is 50 or more full-time equivalent employees (IRS, Employer Shared Responsibility Provisions).

An employer at that size must offer coverage to at least 95% of full-time employees and their children, or face a penalty (IRS, Employer Shared Responsibility Provisions). Below 50, the choice is yours. Most owners offer coverage anyway, because it helps with hiring. Only 59% of firms with 10 to 199 workers offered benefits in 2025, so a plan sets a small firm apart (KFF, 2025).

How much does small business health insurance cost in Illinois?

Small business health insurance in Illinois costs about what it costs small firms nationally, and 2027 filings point higher. KFF reports 2025 averages by firm size, but not by state, so the national small-firm numbers below are the best sourced benchmark.

Source: KFF Employer Health Benefits Survey (2025). Monthly figures are the annual averages divided by 12, and the employer and worker splits apply KFF's 16% and 36% worker shares to those averages.

The average deductible for single coverage in small firms was $2,631, versus $1,670 at larger firms (KFF, 2025). Family coverage is where small firms feel the squeeze, since workers there paid 36% of the premium versus 23% at larger firms (KFF, 2025).

For 2027, Illinois insurers filed preliminary rate requests averaging +15.4% for small group and +14.0% for individual coverage, as of June 2026 (Illinois Department of Insurance filings, summarized by ACASignups.net). Preliminary filings can change during the state's review, so treat this as a warning to get quotes early, not a final price.

Here is what the averages mean for payroll. A hypothetical Illinois employer with 10 employees on single coverage at the KFF small-firm average pays about $77,372 a year, or $7,737 per employee (KFF, 2025, calculated). At the same average, a 5-person firm pays about $38,686 and a 25-person firm about $193,431. If 2027 renewals land near +15.4%, the 10-person firm's bill would rise by about $11,900 a year. These are illustrations built from national averages, not quotes.

How does a Section 125 plan lower an Illinois employer's health plan cost?

A Section 125 cafeteria plan lets employees pay their share of premiums with pay that has not been taxed yet. That lowers the wages the employer pays payroll tax on.

The employer FICA rate is 7.65% (IRS Publication 15, 2026). Every dollar of employee premium moved to pre-tax saves the employer 7.65 cents. Illinois also taxes wages at a flat 4.95% (Illinois Department of Revenue), so employees may see state income tax savings on top of their federal savings. Confirm state treatment with your payroll provider.

Here is the mechanic on the KFF single-coverage average. A worker paying $1,473.76 a year toward premiums (16% of $9,211) moves that money pre-tax. The employer saves 7.65% of $1,473.76, about $112.74 a year for that employee. For 10 employees that is $1,127.43 a year in FICA. The premium contribution alone produces the smaller number, because small-firm workers pay a modest share of single coverage.

Summit Health Benefits runs a Section 125 plan with a $35 per enrolled employee per month administration fee that is paid out of the FICA savings the plan creates. Summit's plan design produces employer FICA recapture of about $91 to $136 per enrolled employee per month, so the employer nets about $56 to $101 per enrolled employee per month (Summit Health Benefits, 2026). Your own number depends on which benefits run through the plan, so run the Section 125 savings calculator with your headcount and premiums.

What are the small group health plan options for Illinois employers?

Illinois small employers can buy a fully insured group plan, a level-funded plan, or fund an individual coverage HRA. Each fits a different size, budget and risk tolerance.

A Section 125 plan sits on top of the first three. It does not replace the plan, it changes how employees pay their share. Our best small business health insurance guide lists carriers, and our group health insurance quotes checklist covers what a broker needs from you.

What happens when an Illinois employee leaves a small group plan?

An employee who leaves a small Illinois employer may keep the group coverage for up to 12 months under Illinois continuation law, if the group is not covered by federal COBRA. Federal COBRA applies to employers with 20 or more employees.

The Illinois Department of Insurance fact sheet on continuation rights sets these terms: the worker must have been enrolled for the 3 months before the qualifying event, must ask in writing within 30 days of the later of the event or written notice, and cannot elect more than 60 days after the event. The premium cannot exceed the group rate, and the employee pays the full cost, including the employer's share. Owners of Illinois firms under 20 employees should put these dates in their termination checklist. Our COBRA guide explains the federal rules for larger groups.

Is there a tax credit for small business health insurance in Illinois?

Yes. The federal small business health care tax credit can cover up to 50% of premiums for qualifying employers, and it is not limited to Illinois. An employer needs fewer than 25 full-time equivalent employees and average annual wages under $67,000 per FTE for 2025 (IRS Instructions for Form 8941, 2025).

The employer must pay a uniform percentage of at least 50% of the premium for each enrolled employee, generally through a SHOP Marketplace, and the credit runs for 2 consecutive tax years (IRS Instructions for Form 8941, 2025). Ask a broker whether SHOP coverage is available for your group before you count on the credit. Our small business health care tax credit guide has the worked math.

How do I get small business health insurance quotes in Illinois?

You get quotes by giving a broker or carrier your employee census, your ZIP codes, and your current plan. Ask for at least three quotes and compare the deductible and out-of-pocket maximum, not only the premium.

Copy and send this request, and fill in the brackets:

Subject: Small group health insurance quote request, [Company Name], Illinois

>

Hello, I run a business in [City], Illinois with [number] employees. I would like quotes for a [January 1 / other] effective date. Please quote a fully insured plan and, if available, a level-funded plan. Attached is my census with each employee's age and ZIP code. I plan to contribute [percent] of the employee-only premium. Please include the deductible, out-of-pocket maximum, network and 2027 renewal outlook for each option. Thank you.

Frequently Asked Questions

Sources: Illinois Small Employer Health Insurance Rating Act, 215 ILCS 97/5 (Illinois General Assembly); KFF, 2025 Employer Health Benefits Survey (2025); Illinois Department of Insurance, 2027 preliminary rate filings, as summarized by ACASignups.net (June 2026); Illinois Department of Insurance, Illinois Continuation Rights fact sheet; Illinois Department of Healthcare and Family Services, Get Covered Illinois launch notice (October 2025); Illinois Department of Revenue, Income Tax Rates; IRS, Employer Shared Responsibility Provisions; IRS Publication 15, Employer's Tax Guide (2026); IRS, Instructions for Form 8941 (2025); Summit Health Benefits, Section 125 program terms (2026).