Illinois business license guide
Last checked: April 26, 2026
Illinois business licensing is not handled by one office. Most businesses need to check state tax registration, entity or assumed name filings, city or county rules, zoning, and any industry license that applies to what they do.
This guide explains the Illinois layers in plain English so you can find the right office before you open, advertise, sell, hire, or lease a space.
The short answer
Illinois does not appear to use one single statewide general business license for every business in the official startup path reviewed. Instead, the state points businesses to separate steps: tax registration with the Illinois Department of Revenue, entity filings with the Illinois Secretary of State when needed, assumed name registration with the county clerk or Secretary of State depending on business type, regulated-industry licenses, and local city or county approval.
That does not mean you can skip licensing. A Chicago home-based business, a food truck, a liquor seller, a contractor, a storefront in unincorporated Cook County, and a retailer selling taxable goods may all have different requirements.
Do this first: identify your business type, exact Illinois location, legal structure, products or services, sales tax activity, employees, and whether customers will visit your home, vehicle, booth, or storefront.
Start here if you are opening a business in Illinois
- Write down your exact business activity. “Retail store,” “home bakery,” “cleaning service,” “food truck,” “contractor,” and “online seller” can lead to different offices.
- Check your legal structure. Sole proprietors and general partnerships often handle assumed names through the county clerk. LLCs, corporations, limited partnerships, and similar entities usually involve the Illinois Secretary of State.
- Check Illinois tax registration. The Illinois Department of Revenue says businesses that conduct business in Illinois or with Illinois customers must register with IDOR unless an exception applies. The main online path is MyTax Illinois and Form REG-1.
- Check your city, village, or county. Illinois local governments vary a lot. Some require a general business license or registration. Others license only certain business types.
- Check zoning before signing a lease. Local zoning can affect storefronts, home occupations, signs, parking, customer visits, outdoor storage, food operations, and changes of use.
- Check industry rules. Food, liquor, cannabis, health care, finance, insurance, child care, salons, construction trades, and many professions may need state or local approvals.
Tip: Do not use the word “license” too loosely. In Illinois, the thing you need may be a Certificate of Registration, assumed name filing, business registration, home occupation license, occupancy permit, local business license, professional license, health permit, liquor license, or resale certificate.
Illinois facts box
| Topic | Illinois-specific detail | Where to check |
|---|---|---|
| General statewide business license | No single statewide general business license was identified in the official Illinois startup path reviewed. Illinois separates tax registration, entity filings, professional licenses, industry permits, and local approvals. | Illinois DCEO Step-by-Step Guide and Business Information Center |
| State tax registration | IDOR says businesses that conduct business in Illinois or with Illinois customers must register unless an exception applies. MyTax Illinois is the main online path for Form REG-1. | Illinois Department of Revenue Business Registration |
| Sales tax authorization | Retailers that sell, lease, or rent tangible personal property may need an IDOR Certificate of Registration. This is a tax registration, not a city business license. | IDOR Registering Your Business |
| Resale certificate | Illinois uses Form CRT-61, Certificate of Resale, to document certain tax-exempt purchases for resale. Sellers should verify the buyer’s Illinois account ID or resale number. | IDOR Certificate of Resale |
| Assumed name or DBA | Sole proprietors and general partnerships using a name different from the owner’s full legal name register with the local county clerk under the Illinois Assumed Name Act. LLCs and corporations use the Secretary of State for entity filings and assumed name adoptions. | Illinois DCEO Step-by-Step Guide and Illinois Secretary of State Assumed Name Adoptions |
| Employer setup | New employers may need to register with IDES. IDES says a newly-created employing unit must register within 30 days of start-up. Employers must also report new hires to the state new hire directory within 20 days of the employee’s first day on payroll. | IDES New Employer Registration and IDES New Hire Reporting |
| Professional licensing | IDFPR is the main state licensing agency for many Illinois professions. Some license types use IDFPR’s CORE system, while others may still use separate processes. | Illinois Department of Financial and Professional Regulation |
| Local rules | Illinois cities, villages, and counties can have their own business license, registration, zoning, occupancy, sign, health, fire, liquor, and local tax rules. | Your city, village, county clerk, planning or zoning office, local health department, and local finance or revenue office |
Illinois licensing has layers
The most common mistake is asking, “Do I need an Illinois business license?” as if one agency gives one answer. A safer question is: “Which federal, state, county, city, tax, zoning, and industry approvals apply to my exact business?”
| Layer | What it may cover | Illinois examples |
|---|---|---|
| Federal | Federal tax ID numbers and federally regulated activities | An EIN from the IRS if needed; federal licenses for activities regulated by federal agencies, such as alcohol, firearms, transportation, aviation, broadcasting, or agriculture-related activities |
| State | State tax registration, entity filings, professional licenses, and regulated industries | IDOR registration through MyTax Illinois, Secretary of State entity filings, IDFPR professional licensing, Illinois Liquor Control Commission licensing, and state health or agriculture programs |
| County | Assumed names, unincorporated-area licenses, local health permits, zoning, building, and occupancy | County clerk assumed name filings; Cook County General Business License for certain businesses in unincorporated Cook County; county health department food permits |
| City, village, or town | Local business license, business registration, zoning approval, occupancy permit, sign permit, liquor approval, fire inspection, and local taxes | Chicago BACP licensing, Joliet business registration or business license, Naperville Business Occupancy Permit, Rockford specific business licenses, and Peoria specific license categories |
| Private platform | Marketplace, delivery app, payment processor, landlord, insurance, or franchise rules | Etsy, Amazon, Shopify, DoorDash, a commercial landlord, or an insurer may ask for documents, but their rules do not replace government permits |
Illinois state registration steps to check
1. Business entity filing with the Illinois Secretary of State
If you form an Illinois LLC, corporation, limited partnership, limited liability partnership, or similar entity, the state filing layer usually runs through the Illinois Secretary of State Business Services.
This is not the same as a city business license. It creates or registers the legal entity. You may still need IDOR tax registration, city or county licensing, zoning approval, and industry permits.
2. Assumed name or DBA filing
Illinois uses the term assumed name in many official sources. The right office depends on the business type.
| Business type | Common Illinois filing path | Plain-English note |
|---|---|---|
| Sole proprietor or general partnership using a name other than the owner’s full legal name | Local county clerk under the Illinois Assumed Name Act | This is often what people mean by a DBA for a small local business. |
| LLC, corporation, limited partnership, or limited liability partnership | Illinois Secretary of State | These entities file with the state. If they use another business name, they may need an assumed name adoption with the Secretary of State. |
| Professional services corporation | May involve county clerk and state requirements depending on the situation | Check the county clerk and the Illinois Secretary of State before using the name. |
Do not treat an assumed name as a license. It may let the public see who owns the business name, but it does not by itself approve your tax registration, zoning, professional license, health permit, or city business license.
3. Illinois Department of Revenue registration
The Illinois Department of Revenue says you must register with IDOR if you conduct business in Illinois or with Illinois customers, unless an exception applies. IDOR lists MyTax Illinois as the electronic way to register a new business using Form REG-1.
If you sell, lease, or rent tangible personal property, IDOR says it will issue a Certificate of Registration. That certificate lists items such as the Sales and Use Tax Account ID, business name, address, effective date, tax type, and expiration date.
For resale purchases, Illinois also uses Form CRT-61, Certificate of Resale. This is different from the Certificate of Registration. A resale certificate documents why a purchase is tax-exempt because the item is being bought for resale.
4. Employer registration and new hire reporting
If you hire workers, check both federal and Illinois employer steps.
- Check whether you need an EIN from the IRS. The IRS says an EIN is a federal tax ID number, and that you can get one free directly from the IRS.
- Check whether you must register with the Illinois Department of Employment Security. IDES says a newly-created employing unit must register within 30 days of start-up.
- Report new hires through the Illinois New Hire Reporting process. IDES says employers must report new employees within 20 days of the employee’s first day on payroll.
- Check workers’ compensation, payroll withholding, unemployment insurance, workplace posters, and any industry-specific employment rules before the first employee starts.
The city or county may be the real “business license” office
In Illinois, local rules can be the part that stops a business from opening. Your local requirement may be called a business license, business registration, general business license, occupancy permit, home occupation license, zoning approval, building permit, fire inspection, liquor license, tobacco license, sign permit, or local tax registration.
The Illinois DCEO Step-by-Step Guide tells new businesses that many communities restrict advertising, regulate pricing, or require zoning permits, and that businesses should contact the city or county clerk for local restrictions.
Local examples show why you must check your exact location
| Local government | Official local pattern | Why it matters |
|---|---|---|
| City of Chicago | The Chicago Department of Business Affairs and Consumer Protection issues business licenses to businesses operating in Chicago. Chicago Business Direct is the online system for applying, renewing, and handling some city tax needs. | A Chicago business may need a city license even if it already has an Illinois entity filing and IDOR registration. |
| Unincorporated Cook County | Cook County says businesses operating in unincorporated Cook County are required to obtain a Cook County General Business License unless exempt. Cook County lists a $40 fee for a 2-year license period running March 1, 2025 through February 28, 2027. | This is a county requirement for unincorporated Cook County. It is not the same as a statewide Illinois license. |
| City of Joliet | Joliet requires registration of all businesses, with exceptions for home-based businesses and businesses that hold a current Joliet business license. Joliet states that business registration is not a business license. | Registration and licensing can be separate. Read the city page carefully. |
| City of Naperville | Naperville uses a Business Occupancy Permit for new businesses assuming a tenant space without building modification. A change in business name or ownership requires an application for a Business Occupancy Permit. | A storefront may need occupancy approval even when the state tax and entity steps are already complete. |
| City of Peoria | Peoria says it does not issue a standard or general business license, but it does issue specific business licenses, occupational licenses, and property registrations. | “No general license” does not mean “no permits.” |
| City of Rockford | Rockford says it does not require every business to have a general business license, but specific businesses do require a license. | Some Illinois cities license only certain business activities. |
Before you sign a lease: ask the local planning or zoning office whether your business activity is allowed at that address. A legal entity filing, EIN, or IDOR account does not prove the address is zoned for your business.
Industry-specific Illinois licenses and permits
Some Illinois businesses need a state license because of what they sell, who they serve, or the risk involved. Others need a local permit or inspection even when the state handles part of the industry.
Professional and occupational licenses
The Illinois Department of Financial and Professional Regulation is the main state licensing agency for many professions. IDFPR lists licensed professions, online renewal, license lookup, and its licensing portal. Some license types are moving through the CORE licensing system, while others may still follow different instructions.
Examples that may involve IDFPR or another board include health professions, real estate, design professions, financial services, salons, barbers, cosmetology, and other regulated professions. Always check the exact profession page.
Food businesses
The Illinois Department of Public Health says retail food establishments in Illinois, including restaurants, bakeries, grocery stores, and food trucks, are regulated by the local health department serving the jurisdiction where the establishment is located.
If you prepare, store, package, sell, or serve food, contact the local health department before buying equipment, signing a lease, or selling at an event. Cottage food, mobile food, temporary events, and food trucks can have special rules.
Liquor businesses
The Illinois Liquor Control Commission Licensing Division reviews state liquor license applications and issues state liquor licenses. Local liquor approval may also be required, so check the city, village, or county liquor authority before you assume a state license is enough.
Agriculture, scales, fuel, and measuring devices
The Illinois Department of Agriculture Bureau of Weights and Measures handles commercial weighing and measuring device oversight. Businesses using retail scales, fuel dispensers, or other commercial measuring devices may need inspection or compliance steps.
Other regulated businesses
Health care, child care, cannabis, transportation, insurance, financial services, alarm systems, pawnbrokers, tobacco, massage, contractors, building trades, and short-term rentals may involve special state and local rules. Search the Illinois Business Information Center, then verify with the specific agency that regulates your activity.
Home-based businesses in Illinois
A home-based business may still need state tax registration, an assumed name filing, a city license, zoning approval, or a local home occupation permit. The rules depend heavily on the city, village, county, zoning district, customer visits, signs, employees, vehicles, storage, noise, deliveries, and the type of work.
For example, Chicago states that a City of Chicago business license is required to operate a business out of your home, and that only certain activities may be licensed as a home occupation. Cook County’s unincorporated-area business occupancy page says home-based business occupancy may require a homeowner affidavit.
- Ask whether your city, village, or county allows your activity from a residence.
- Ask whether customers, employees, deliveries, inventory, signs, or outdoor storage are allowed.
- Ask whether a home occupation permit, home-based business license, affidavit, or zoning approval is needed.
- Check your lease, condo rules, HOA rules, insurance, and local fire or building limits.
- Do not assume an online-only business is exempt from local rules.
Illinois city starting points
Use these official local pages as starting points. If your city is not listed, search your city or village website for “business license,” “business registration,” “permits,” “zoning,” “occupancy,” “home occupation,” and “city clerk.”
| City or local area | Official place to start | What to look for |
|---|---|---|
| Chicago | Chicago Small Business Center and Chicago Business Direct | Business license type, zoning, renewal, city tax, public way use, home-based business, inspections |
| Aurora | City of Aurora official website | Business registration, zoning, building permits, fire review, local license categories |
| Naperville | Naperville permits and licenses | Business occupancy, tenant build-out, signs, permits, development review |
| Joliet | Joliet Business Services | Business registration, business license applications, warehouse licensing, liquor and tobacco applications |
| Rockford | Rockford business licenses | Specific licensed business types, customer self-service portal, local license fee schedule |
| Peoria | Business Plays in Peoria and Peoria permits and licenses | Specific business licenses, occupational licenses, property registrations, local taxes |
| Springfield | Springfield City Clerk licenses and permits | Business licenses, liquor, gaming, taxi, sign, and other city licenses |
| Unincorporated Cook County | Cook County General Business License | County general business license, exemptions, license period, county revenue rules |
Step-by-step checklist for Illinois
- Choose your business activity and location. Write down the exact address if you have one. If mobile or home-based, write down where you will store equipment, prepare products, meet customers, and make sales.
- Choose your legal structure. Decide whether you are a sole proprietor, general partnership, LLC, corporation, nonprofit, or another entity. Ask a qualified professional if you are unsure.
- Register the entity if needed. LLCs, corporations, and similar entities should check the Illinois Secretary of State Business Services page.
- Register your assumed name if needed. Sole proprietors and general partnerships usually check the county clerk. LLCs and corporations should check the Illinois Secretary of State if using an assumed name.
- Get an EIN if needed. Apply directly through the IRS if your business needs one. Do not pay a third-party site just to obtain an EIN unless you knowingly choose paid help.
- Register with IDOR if required. Use MyTax Illinois and Form REG-1 for Illinois tax registration. Retailers should check Certificate of Registration requirements.
- Check local business licensing. Contact the city, village, or county where the business operates. Ask about business license, business registration, occupancy, zoning, signs, fire, and local taxes.
- Check industry permits. Food, liquor, health, professional services, cannabis, construction, tobacco, short-term rentals, transportation, and other regulated work may need special approval.
- Check employer rules before hiring. Register with IDES if required, report new hires, and set up payroll tax, workers’ compensation, and workplace compliance.
- Save proof. Keep copies of entity filings, assumed name certificates, IDOR letters, Certificate of Registration, local licenses, zoning approvals, inspection approvals, and renewal dates.
What to ask when you contact the agency
Before calling or emailing, have your business type, location, legal structure, business name, products or services, sales method, employee plans, and opening date ready. If you have a home-based, mobile, online, food, alcohol, beauty, health, contractor, or short-term rental business, say that clearly.
Phone or email script
Hello, I am trying to confirm what approvals I need before operating a [business type] in [city], [county], Illinois. The business will be [home-based / mobile / storefront / online], located at or operating from [address or general location], and will sell or provide [products or services]. My legal structure is [sole proprietor / general partnership / LLC / corporation / not sure]. Can you confirm whether I need a local business license, business registration, zoning approval, occupancy permit, health permit, fire inspection, sign permit, local tax registration, or another license before I start? If your office does not handle one of these, which office should I contact next?
If you are contacting IDOR, ask about tax registration and whether your activity needs a Certificate of Registration or other tax account. If you are contacting a city or county, ask about the exact address and activity. If you are contacting a professional board, ask about the exact license type and whether the business entity also needs approval.
- Write down the agency name and the person or division you contacted.
- Write down the date and time.
- Write down the exact license, permit, registration, certificate, or approval name they mention.
- Ask for the official application link or fee page.
- Ask whether zoning or occupancy must be approved before the license.
- Ask whether state and local approval are both required.
- Ask whether renewals, inspections, public notices, or posted certificates apply.
Common Illinois mistakes to avoid
- Confusing an LLC with a business license. An LLC filing creates a legal entity. It does not replace IDOR registration, local licensing, zoning, or industry permits.
- Calling every tax item a seller’s permit. Illinois commonly uses IDOR registration and Certificate of Registration language. A resale certificate is another separate document.
- Skipping the county clerk assumed name filing. Sole proprietors and general partnerships using a name different from the owner’s full legal name should check the county clerk under the Illinois Assumed Name Act.
- Assuming “no general license” means no local approval. Peoria and Rockford show that a city may not license every business, but may still license specific activities.
- Signing a lease before zoning review. A space can be wrong for your use even if a similar business operated nearby.
- Opening a food business without the local health department. IDPH says retail food establishments are regulated by the local health department serving the jurisdiction.
- Ignoring city rules for home businesses. Home-based businesses may still need a local license or home occupation approval.
- Relying only on private platform rules. A marketplace, delivery app, payment processor, or landlord may request documents, but they do not decide all government requirements.
Official Illinois agency directory
Use official sources first. These links are starting points, not a substitute for checking your exact business activity and location.
- Illinois Business Information Center — statewide resource for regulatory and permitting information, business specialists, and a searchable inventory of business requirements.
- Illinois DCEO Step-by-Step Guide to Starting a Business — ownership structure, assumed names, local restrictions, employer responsibilities, and state licensing references.
- Illinois Secretary of State Business Services — business entity filings, business search, certificates, and related state filings.
- Illinois Secretary of State Assumed Name Adoptions — assumed name filings for entities handled by the Secretary of State.
- Illinois Department of Revenue Business Registration — MyTax Illinois, Form REG-1, IDOR tax registration, and related account setup.
- IDOR Registering Your Business — Certificate of Registration details for retailers.
- IDOR Certificate of Resale — Form CRT-61 and resale certificate information.
- Illinois Department of Employment Security New Employer Registration — employer registration with IDES.
- Illinois New Hire Reporting — new hire reporting requirements and reporting options.
- Illinois Department of Financial and Professional Regulation — professional licensing, license lookup, renewals, and IDFPR portals.
- Illinois Department of Public Health Retail Food — retail food businesses and local health department direction.
- Illinois Liquor Control Commission Licensing — state liquor license categories and licensing division information.
- IRS Employer Identification Number — federal EIN information and free IRS application path.
- U.S. Small Business Administration licenses and permits — overview of federal, state, and local license layers.
Review note
This page was last checked against official Illinois, local, and federal sources on April 26, 2026. Rules, fees, portals, forms, license names, renewal periods, and local procedures can change. Always confirm the current requirement with the official agency before acting.
FAQ
Does Illinois have one statewide general business license?
No single statewide general business license was identified in the official Illinois startup path reviewed. Illinois uses separate state tax registration, entity filings, assumed name filings, professional or industry licenses, and local city or county approvals.
Is an Illinois LLC the same as a business license?
No. An Illinois LLC filing creates or registers a legal entity. It does not replace Illinois Department of Revenue registration, local business licensing, zoning approval, health permits, professional licenses, or other permits that may apply.
What is an Illinois Certificate of Registration?
An Illinois Certificate of Registration is issued by the Illinois Department of Revenue for certain tax registrations, including businesses that sell, lease, or rent tangible personal property. It is not the same as a city business license.
Where do I file a DBA in Illinois?
Illinois commonly uses the term assumed name. Sole proprietors and general partnerships usually register an assumed name with the local county clerk when the business name is different from the owner’s full legal name. LLCs, corporations, and similar entities should check the Illinois Secretary of State.
Do online businesses in Illinois need a license?
An online business may still need Illinois tax registration, an assumed name filing, local approval, a home occupation license, or an industry permit. The answer depends on what you sell, where the business is based, whether you have employees, and the city or county rules.
Do home-based businesses need a license in Illinois?
They might. Home-based business rules are often local. You may need a city business license, home occupation approval, zoning clearance, or county requirement, plus any state tax or industry registration that applies to your activity.
Who regulates food businesses in Illinois?
Retail food establishments in Illinois are generally regulated by the local health department serving the place where the business operates. Contact the local health department before opening a restaurant, bakery, grocery, food truck, temporary food booth, or similar food business.
When should I contact the city or county?
Contact the city, village, or county before you sign a lease, open to customers, advertise locally, put up a sign, operate from home, serve food, sell alcohol, hire workers, or change the use of a space.
Plain-English disclaimer
This guide is for general information only. It is not legal, tax, financial, insurance, immigration, employment, safety, zoning, or professional advice. Business license rules, tax rules, fees, portals, forms, and local policies can change. Confirm important details with the official agency or a qualified professional before you act.