Start a Business in Illinois: New Owner Guide

To start a business in Illinois, you usually choose a business structure, register with the Illinois Secretary of State if needed, get a federal EIN, register for Illinois taxes through MyTax Illinois, check state and local licenses, set up insurance and banking, then confirm your city or county permits before you sell. If you are forming an Illinois LLC, the main state filing is the Articles of Organization with the Illinois Secretary of State Department of Business Services.

Here is the plain-English path from idea to first customer.

Registration

Your first decision is your legal structure. In Illinois, most first-time founders choose one of these:

• Sole proprietorship: simplest option if you are one person and not forming a separate legal entity. You do not file formation papers with the Illinois Secretary of State, but if you use a business name that is not your exact legal name, you generally register an assumed name with your county clerk.
• General partnership: similar to a sole proprietorship, but with two or more owners. If you use a trade name, you usually file an assumed name with the county clerk.
• Limited liability company, or LLC: popular for small businesses because it creates a separate legal entity and has flexible tax treatment. You file with the Illinois Secretary of State.
• Corporation: common for companies planning to issue stock, raise institutional investment, or use a more formal ownership structure. You file with the Illinois Secretary of State.
• Not-for-profit corporation: used for charitable, religious, educational, or similar purposes. You still form with the Secretary of State, then separately pursue tax-exempt status if applicable.

For an Illinois LLC, the filing is called Articles of Organization. It is filed with the Illinois Secretary of State, Department of Business Services. The state filing fee is typically around $150. Online filings are often processed faster than paper filings; many online filings can be handled in a few business days, while mailed filings can take longer. Expedited service is usually available for an extra fee, typically around $100, but timing can change with filing volume.

For an Illinois corporation, the filing is called Articles of Incorporation. The base filing cost is typically around $150 or more, depending on the corporation type and share structure. If you are forming a corporation with multiple classes of shares or investor plans, get tax and legal help before filing.

Every Illinois LLC and corporation must have a registered agent. This is the person or company that receives official legal and state notices. The registered agent must have a physical street address in Illinois. A P.O. box alone is not enough. You can serve as your own registered agent if you have an Illinois address and are comfortable with your name and address appearing in public records.

Your business name must be distinguishable from existing names on the Secretary of State’s records. LLC names typically must include “Limited Liability Company,” “LLC,” or “L.L.C.” Corporations usually include a corporate designator such as “Corporation,” “Incorporated,” “Company,” or an abbreviation. If you are not ready to file yet, Illinois allows name reservations, typically for a fee around $25.

If an LLC or corporation wants to operate under a different public name, it files an assumed name with the Illinois Secretary of State. Sole proprietors and general partnerships usually file assumed names at the county level instead.

Typical registration costs and timing:

Illinois LLCs and corporations must file an annual report with the Secretary of State. For LLCs, it is generally due before the first day of the anniversary month of formation. Corporations also have annual reporting requirements. Missing the report can lead to late fees and eventually administrative dissolution.

Taxes

After registration, most Illinois businesses need tax accounts. The main state tax agency is the Illinois Department of Revenue, and many registrations and filings are handled through MyTax Illinois.

Start with your federal EIN from the IRS. An EIN is free and is often required to open a business bank account, hire employees, register for taxes, or work with larger customers. Single-member LLCs without employees may sometimes use the owner’s Social Security number for federal tax purposes, but most founders still get an EIN to keep business finances cleaner.

Illinois has a flat individual income tax rate of 4.95%. Pass-through business income from sole proprietorships, partnerships, most LLCs, and S corporations generally flows to the owner’s Illinois return. The business may also have separate filing obligations depending on how it is taxed.

Corporations pay Illinois corporate income tax, currently 7%, plus the Illinois personal property replacement tax, which is generally 2.5% for corporations and 1.5% for partnerships, S corporations, and certain other pass-through entities. Tax classifications can get complicated quickly, especially for multi-owner LLCs, S corporations, and businesses with owners outside Illinois.

If you sell taxable goods or certain taxable services, register with the Department of Revenue, usually through MyTax Illinois. Illinois sales tax is often described as the Retailers’ Occupation Tax and related use taxes. The statewide general merchandise rate is 6.25%, but local taxes can make the total rate higher. Food, drugs, medical appliances, and some other categories may have different treatment. Because local rates vary across Chicago, Cook County, collar counties, and downstate communities, confirm the rate for your exact selling location or delivery rules before collecting tax.

Sales tax filing frequency can be monthly, quarterly, or annually depending on your business and tax volume. New businesses are assigned a filing schedule by the Department of Revenue. Even if you had no sales, you may still need to file a zero return if you have an active account.

If you hire employees in Illinois, you usually need to:

• Register for Illinois withholding tax with the Illinois Department of Revenue.
• Register for unemployment insurance with the Illinois Department of Employment Security, often called IDES.
• Report new hires as required.
• Withhold federal and state income taxes.
• Pay employer payroll taxes and unemployment insurance.
• Carry workers’ compensation insurance in most cases.

Common Illinois tax accounts include:

Licenses

Illinois does not have one general statewide business license that every business must obtain. Instead, licensing depends on your industry, profession, location, and activities.

Many professional licenses are handled by the Illinois Department of Financial and Professional Regulation, or IDFPR. This agency licenses and regulates many fields, including real estate brokers, cosmetologists, barbers, accountants, architects, engineers, private security, physicians, nurses, pharmacies, and many financial professions.

Other common Illinois licensing bodies include:

• Illinois Liquor Control Commission: state liquor licensing, in addition to local liquor approval.
• Illinois Department of Public Health: health-related programs, plumbing licensing, and some health facility matters.
• Illinois Department of Agriculture: certain food, agriculture, nursery, weights and measures, and animal-related businesses.
• Illinois Department of Children and Family Services: child care licensing.
• Illinois Department of Insurance: insurance producers and insurance-related businesses.
• Illinois Commerce Commission: certain transportation, towing, moving, utility, and regulated service activities.
• Illinois Gaming Board: gaming-related licensing.
• Illinois Department of Financial and Professional Regulation Cannabis Regulation Oversight-related programs: cannabis businesses are heavily regulated and require specialized approvals.

Chicago founders should also check the City of Chicago Department of Business Affairs and Consumer Protection, often called BACP. Chicago has its own business license categories, inspections, and local rules. A business that is properly registered with the state may still be unable to operate in Chicago until it has the right city license.

If you are unsure whether your work is licensed, search by profession through IDFPR and also ask your city or county business office. Do this before signing a lease, buying equipment, or advertising regulated services.

Permits

Permits are usually local. Your city, village, or county decides whether your business location is allowed, whether you need inspections, and whether you can put up signs, serve food, remodel a space, or operate from home.

Common Illinois local permits include:

• Local business license: required by many cities and villages, even when the state does not require a general license.
• Zoning approval: confirms your business activity is allowed at your location.
• Certificate of occupancy: often required before opening a retail, office, warehouse, restaurant, salon, studio, or production space.
• Home occupation permit: common for businesses run from a home, especially if customers visit, inventory is stored, signage is used, or employees come to the home.
• Building permit: needed for construction, remodeling, electrical, plumbing, HVAC, or structural changes.
• Fire inspection: common for public-facing spaces, restaurants, day cares, assembly spaces, and businesses with special hazards.
• Health permit: required for restaurants, bakeries, caterers, food trucks, shared kitchens, body art, pools, and some personal care businesses.
• Sign permit: often required before installing exterior signage, window signs, illuminated signs, or temporary banners.

Illinois can be very local in practice. A business in Chicago may deal with BACP, the Department of Buildings, zoning, fire, and public health. A business in Naperville, Rockford, Springfield, Peoria, Champaign, Aurora, Joliet, or a smaller village will follow that local government’s process. If your business is outside city limits, check with the county.

Before you sign a lease, call or visit the local zoning or business licensing office and describe your business in plain English. Ask: “Is this use allowed at this address, and what approvals do I need before opening?” That one question can save weeks of delay.

Insurance

Illinois requires some insurance in specific situations.

If you have employees, Illinois generally requires workers’ compensation insurance. This requirement is broad and can apply even if you only have one part-time employee. Workers’ comp is overseen by the Illinois Workers’ Compensation Commission. Sole proprietors with no employees are often not required to carry workers’ comp, but some industries, contracts, or construction-related work may still require coverage.

If your business owns or uses vehicles, you need proper auto coverage. Illinois requires minimum auto liability coverage, commonly listed as 25/50/20: $25,000 for bodily injury or death of one person, $50,000 per accident, and $20,000 for property damage. Commercial vehicles, delivery use, rideshare, trucking, and employee driving can require more than a personal policy.

Common policies Illinois small businesses carry include:

• General liability insurance: customer injury, property damage, and basic third-party claims.
• Professional liability or errors and omissions: important for consultants, designers, accountants, agencies, IT firms, and licensed professionals.
• Commercial property insurance: equipment, inventory, furniture, and tenant improvements.
• Business owner’s policy: bundles general liability and property for many small businesses.
• Cyber liability: useful if you collect customer data, take online payments, or store sensitive information.
• Employment practices liability: helps with certain employee-related claims.
• Liquor liability: required or strongly expected if you sell or serve alcohol.

Landlords, lenders, marketplaces, and enterprise clients may require proof of insurance before they work with you.

Banking

Open a business bank account before you accept money. Keeping business and personal finances separate helps preserve liability protection, makes taxes easier, and gives you cleaner records if you ever apply for financing.

Illinois banks and credit unions usually ask for:

• Your EIN from the IRS.
• Articles of Organization or Articles of Incorporation from the Illinois Secretary of State.
• An operating agreement for an LLC or bylaws/resolutions for a corporation.
• Government-issued ID for owners or signers.
• Business address and contact information.
• Assumed name paperwork if you use a DBA.
• Ownership information required under federal beneficial ownership banking rules.

When comparing Illinois banks, look for low monthly fees, easy online banking, cash deposit options, local branch access if you handle cash, ACH and wire tools, integration with your bookkeeping software, and lending relationships. A neighborhood credit union may be a good fit for a local service business. A larger regional or national bank may be better if you expect multi-state operations, high transaction volume, or investor funding.

Once the account is open, route all business income and expenses through it. Pay yourself by owner draw, payroll, or distributions depending on your tax structure. Do not treat the account like a second personal checking account.

State Resources

These real Illinois organizations can help you move faster and avoid wrong turns:

• Illinois Secretary of State, Department of Business Services: forms LLCs, corporations, not-for-profit corporations, foreign entities, assumed names for registered entities, certificates of good standing, and annual reports.
• Illinois Department of Revenue: handles state tax registration, sales tax, withholding tax, income tax, excise taxes, and MyTax Illinois accounts.
• MyTax Illinois: the state’s online portal for many business tax registrations, payments, returns, and account notices.
• Illinois Department of Employment Security: handles unemployment insurance registration, wage reporting, and employer unemployment tax accounts.
• Illinois Department of Financial and Professional Regulation: licenses many regulated professions and businesses, including real estate, cosmetology, healthcare professions, financial services, and more.
• Illinois Workers’ Compensation Commission: provides information about workers’ compensation requirements and compliance.
• Illinois Department of Commerce and Economic Opportunity: the state economic development agency; helps with business programs, incentives, workforce resources, and expansion support.
• Illinois Small Business Development Center Network: offers no-cost or low-cost help with business planning, startup steps, financial projections, exporting, marketing, and funding readiness.
• SCORE Illinois chapters, including SCORE Chicago: volunteer mentors who help with business plans, startup questions, marketing, and operations.
• Illinois APEX Accelerator: helps businesses that want to sell to government agencies and pursue public contracts.
• City of Chicago Department of Business Affairs and Consumer Protection: key resource for Chicago business licenses, inspections, public way use, and local compliance.

FAQs

Do I need a business license to start a business in Illinois?
Illinois does not have one general statewide business license for every company. But your city, village, county, or industry may require a license before you operate. Always check local licensing and zoning before opening.

How much does it cost to form an LLC in Illinois?
The Illinois LLC Articles of Organization filing fee is typically around $150. You may also pay for a registered agent service, name reservation, assumed name filing, local license, permits, insurance, and annual report fees.

Where do I register for Illinois sales tax?
Register with the Illinois Department of Revenue, commonly through MyTax Illinois. After registration, the state assigns your filing frequency, and you must collect the correct state and local tax rate for taxable sales.

Do I need a registered agent for my Illinois LLC?
Yes. Illinois LLCs and corporations need a registered agent with a physical street address in Illinois. The agent receives legal papers and official state notices.

Can I run a business from home in Illinois?
Often yes, but local rules control. Your city, village, or county may require a home occupation permit and may restrict signage, customer visits, employees, deliveries, noise, or inventory storage.

Business Launch Steps

1. Choose your business idea and revenue model — 1 to 3 days. Write what you sell, who buys it, how you deliver it, and how you get paid.
2. Pick your Illinois business structure — 1 to 2 days. Decide whether you will operate as a sole proprietor, LLC, corporation, partnership, or not-for-profit.
3. Check your business name — same day. Search Illinois Secretary of State records, domain availability, social handles, and local assumed name rules.
4. Confirm zoning before signing a lease — 1 day to 2 weeks. Ask the city, village, or county if your business activity is allowed at the address.
5. File formation documents if needed — a few business days online; longer by mail. LLCs file Articles of Organization with the Illinois Secretary of State.
6. Create your internal documents — 1 to 3 days. LLCs should prepare an operating agreement. Corporations should prepare bylaws, initial resolutions, and stock records.
7. Get your EIN from the IRS — usually same day online. Use it for taxes, banking, payroll, and vendor paperwork.
8. Register with the Illinois Department of Revenue — same day to a few days. Use MyTax Illinois for sales tax, withholding, and other state tax accounts that apply.
9. Register for payroll accounts if hiring — a few days to 2 weeks. Set up withholding, IDES unemployment insurance, workers’ comp, and new-hire reporting.
10. Apply for state professional or industry licenses — timing varies. Check IDFPR and other state agencies before advertising regulated services.
11. Apply for local licenses and permits — 1 week to several months. Restaurants, salons, day cares, liquor businesses, and buildouts take longer because of inspections.
12. Buy required insurance — 1 to 7 days. Get workers’ comp if you have employees and commercial coverage for your risk level.
13. Open a business bank account — 1 to 5 days. Bring your EIN, Illinois formation papers, owner ID, and operating agreement or corporate documents.
14. Set up bookkeeping and sales tax tracking — 1 to 3 days. Track income, expenses, receipts, payroll, and tax due by location.
15. Prepare your launch basics — 1 to 2 weeks. Create your offer, pricing, invoice or checkout flow, website or landing page, contracts, and customer intake process.
16. Make your first compliant sale — timing varies. Confirm licenses, permits, tax collection, and insurance are active before serving your first paying customer.

Starting in Illinois is very doable when you break it into steps. If you want a custom checklist for your city, industry, entity type, and timeline, Stratify can build your personalized roadmap.