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Illinois Business Compliance: Chicago and Statewide Requirements

March 24, 2026

12 min read

Doing Business in Illinois: A Complex but Navigable Landscape

Illinois is the fifth-largest state economy in the nation, with Chicago serving as one of the country's premier business hubs. From technology startups in the Loop to manufacturing operations downstate, Illinois offers tremendous opportunities. But with those opportunities come significant compliance requirements at the state, county, and municipal levels.

Illinois is known for having more layers of government than most states, with over 6,000 units of local government. That translates to a complex web of licensing, tax, and regulatory requirements. This guide will help you navigate all of them.

Registering Your Business in Illinois

Filing with the Secretary of State

LLCs, corporations, and limited partnerships must register with the Illinois Secretary of State. Here is what you need:

For an LLC:

File Articles of Organization
Filing fee: $150
Designate a registered agent with an Illinois address
Annual report fee: $75 (due before the first day of the anniversary month)

For a Corporation:

File Articles of Incorporation
Filing fee: $150 (plus franchise tax based on paid-in capital)
Adopt bylaws and appoint directors
Annual report fee: $75

For a Foreign Entity (formed in another state):

File an Application for Authority
Filing fee: $150
Must maintain a registered agent in Illinois

Need help understanding the registered agent requirement? See our registered agent explainer.

Assumed Business Name (DBA)

If your business operates under a name different from its legal name, you must file an Assumed Business Name registration with the county clerk in the county where you operate. In Cook County (Chicago), this is handled by the Cook County Clerk's office.

Illinois Tax Compliance

State Income Tax

Illinois has a flat income tax rate:

Individual income tax: 4.95% (applies to sole proprietors, LLC members, S-corp shareholders)
Corporate income tax: 7.0% (applies to C-corps)
Personal property replacement tax: An additional 1.5% for partnerships and S-corps, 2.5% for C-corps

Sales Tax

Illinois has one of the more complex sales tax structures in the country:

State base rate: 6.25%
Local additions: Cities, counties, and special districts add their own taxes
Chicago combined rate: Over 10% for most goods
Different rates for different categories (general merchandise, food and drugs, qualifying food, vehicles)

If you sell taxable goods or services, you must register for a sales tax permit with the Illinois Department of Revenue (IDOR). Online sellers with Illinois economic nexus (over $100,000 in sales or 200 transactions) must also collect and remit Illinois sales tax.

Use Tax

Illinois imposes a use tax on items purchased out of state for use in Illinois. If you buy equipment or supplies from out-of-state vendors that do not collect Illinois sales tax, you owe use tax.

Withholding Tax

If you have employees in Illinois, you must register to withhold Illinois income tax from their wages. File Form IL-5020 to register with IDOR.

Chicago-Specific Requirements

Chicago Business License

Chicago has its own business licensing system administered by the Department of Business Affairs and Consumer Protection (BACP). Most businesses operating within Chicago city limits need a Chicago business license.

Common Chicago licenses include:

Limited Business License: Required for most businesses (the general catch-all license)
Retail Food Establishment License: For restaurants, cafes, grocery stores, and food service
Liquor License: Multiple categories based on establishment type
Public Place of Amusement License: For entertainment venues
Home Occupation License: For businesses operated from a residence
Shared Kitchen User License: For food businesses using shared commercial kitchen spaces

Application process:

Check zoning compliance at your proposed business location
Apply through the Chicago Business Direct portal
Pass any required inspections (health, fire, building)
Pay applicable fees (range from $50 to several hundred dollars depending on license type)

Chicago Employer Requirements

Chicago has several employment requirements beyond state law:

Chicago Minimum Wage: Higher than the state minimum, with annual increases
Chicago Paid Leave and Paid Sick Leave Ordinance: All Chicago employers must provide paid leave. The law requires both paid sick leave and paid leave that can be used for any reason.
Chicago Fair Workweek Ordinance: Applies to certain industries (hospitality, healthcare, manufacturing, retail, warehouse) and requires predictable scheduling for covered employees
Chicago Anti-Harassment Training: Annual sexual harassment prevention training required for all employees, with additional training for managers and bystander training requirements

Cook County Requirements

Businesses in suburban Cook County (outside Chicago) may also face:

Cook County Minimum Wage: Higher than the state minimum for employers in unincorporated Cook County and municipalities that have opted in
Cook County Earned Sick Leave Ordinance: Similar to Chicago's but applies to Cook County
Cook County sweetened beverage tax (repealed, but check for any reinstatement or local alternatives)

Employment Law in Illinois

Illinois has some of the most employee-friendly laws in the Midwest:

Illinois Minimum Wage

The Illinois minimum wage is $15.00 per hour as of January 1, 2025. Employers with fewer than 50 employees may pay reduced rates for workers under 18.

Illinois Paid Leave for All Workers Act

Effective January 1, 2024, this law requires all Illinois employers to provide a minimum of 40 hours of paid leave per year that employees can use for any reason. Key points:

Accrues at a rate of one hour per 40 hours worked
Employers can frontload 40 hours at the start of the year
Applies to all employees, including part-time workers

Illinois Human Rights Act

Illinois prohibits discrimination and harassment based on an extensive list of protected classes. The Illinois Department of Human Rights (IDHR) investigates complaints and can impose penalties.

Employers must also comply with the Illinois Workplace Transparency Act, which restricts confidentiality provisions in settlement agreements related to workplace harassment or discrimination.

Workers' Compensation

Illinois requires all employers to carry workers' compensation insurance with no minimum employee threshold. Even if you have one part-time employee, you must have coverage.

Learn more about workers' comp requirements in our small business insurance guide.

Illinois Day and Temporary Labor Services Act

If you use temporary staffing agencies, Illinois law requires that temporary workers receive equal pay and equivalent benefits to comparable direct-hire employees after 90 days of placement.

Illinois Employee Retirement Savings

Businesses with five or more employees that do not offer a retirement plan must participate in the Illinois Secure Choice program, a state-facilitated Roth IRA for employees. Enrollment is automatic unless employees opt out.

Industry-Specific Licensing

Professional Licensing (IDFPR)

The Illinois Department of Financial and Professional Regulation (IDFPR) oversees licenses for over 90 professions, including:

Real estate brokers and agents
Contractors (roofing specifically; general contractors are licensed locally)
Healthcare professionals (nurses, physicians, dentists, pharmacists)
Barbers and cosmetologists
Public accountants (CPAs)
Architects and engineers
Private detectives and security agencies

Cannabis Businesses

Illinois legalized recreational cannabis through the Cannabis Regulation and Tax Act. Licensing is managed by the Illinois Department of Agriculture (cultivation), the Department of Financial and Professional Regulation (dispensaries), and other agencies depending on license type. The licensing process is highly competitive with social equity provisions.

Food and Beverage

Food businesses need licenses from the Illinois Department of Public Health (IDPH) for manufacturing and from local health departments for retail operations. If you are interested in running a food truck, see our food truck compliance guide.

Construction

While Illinois does not have a general state contractor's license, many municipalities require local contractor registration. Chicago requires contractor registration and has specific licensing for trades like plumbing and electrical work. The Illinois Commerce Commission oversees certain utility-related construction.

Environmental Compliance

The Illinois Environmental Protection Agency (IEPA) regulates:

Air quality permits for emissions sources
Water discharge permits (NPDES)
Hazardous waste management and disposal
Underground storage tanks (common for gas stations and auto dealers)
Asbestos and lead abatement requirements

Businesses in manufacturing, construction, and waste management should budget time for environmental permit applications, as they can take several months.

Data Privacy

Illinois has some of the strongest data privacy protections in the country:

Biometric Information Privacy Act (BIPA)

Illinois BIPA is one of the most litigated privacy laws in the nation. It requires:

Written consent before collecting biometric data (fingerprints, facial recognition, voiceprints)
A published retention and destruction policy
Protections against disclosure

Private right of action: Individuals can sue for $1,000 per negligent violation and $5,000 per intentional violation. This has led to massive class action settlements. If your business uses biometric timekeeping, facial recognition security, or similar technology, BIPA compliance is critical.

Personal Information Protection Act

Illinois also has a data breach notification law requiring businesses to notify affected residents "in the most expedient time possible and without unreasonable delay" after a data breach.

For a broader look at data privacy across states, check our state data privacy laws overview.

Your Illinois Compliance Action Plan

Register your entity with the Illinois Secretary of State
File for your assumed business name (DBA) with the county clerk
Register for state taxes with the Illinois Department of Revenue
Apply for Chicago business licenses if operating in the city
Obtain professional licenses through IDFPR as needed
Set up payroll compliance (withholding, workers' comp, unemployment)
Implement paid leave tracking per the Paid Leave for All Workers Act
Enroll in Illinois Secure Choice if applicable
Calendar your annual report deadline with the Secretary of State

Get Your Personalized Illinois Compliance Checklist

Illinois compliance requirements vary significantly based on your location (Chicago vs. suburbs vs. downstate), industry, and number of employees. A tech company in the Loop faces very different requirements than a manufacturing plant in Peoria.

[Use the SMBRegs compliance wizard](/wizard) to generate a customized compliance checklist for your Illinois business. Just answer a few questions and receive a comprehensive list of every license, permit, registration, and regulatory obligation that applies to you.

Stop guessing about what you need. [Get your personalized compliance roadmap today](/wizard).