Illinois business license guide
Last updated: August 1, 2026
Illinois does not send every business to one office for one catch-all license. Your list may include state tax registration, an LLC or corporation filing, an assumed name, a city or county license, zoning approval, and a permit for your industry.
This guide shows what to check, which government layer handles it, and what to do before you open, sell, hire, sign a lease, or work from home.
Bottom line
Illinois’s official startup resources point businesses to separate registrations and permits rather than one general state license for everyone. Most owners should check four layers: Illinois tax and entity rules, county name or license rules, city or village permits and zoning, and federal requirements for taxes or regulated activities.
A retailer may need Illinois Department of Revenue registration and a local occupancy approval. A home baker may need local health department registration under cottage food rules. A Chicago shop may need a city license. A business in unincorporated Cook County may need the county’s General Business License. The correct list depends on what you do and where you do it.
Quick start: what to check first
- Describe the business in plain words. List every product, service, location, vehicle, website, booth, employee, and customer-facing activity.
- Confirm the exact address and local government. A mailing city may not match the city, village, or unincorporated county that controls zoning and licensing.
- Choose the business structure and name. An LLC, corporation, sole proprietorship, partnership, and assumed name are different filings.
- Check Illinois tax registration. Do this before making purchases or sales or hiring an employee when IDOR registration applies.
- Check local zoning before spending money. Ask about home occupation rules, occupancy, signs, parking, customer visits, storage, and inspections.
- Check the industry. Food, liquor, child care, health, beauty, roofing, real estate, finance, cannabis, transportation, and other regulated work can need added approval.
New to the terms? Compare a business license, LLC, DBA, and seller’s permit before filing anything.
Illinois business licensing has four government layers
Do not treat every filing as the same thing. A tax registration does not approve your location. An LLC does not replace a local license. A county assumed name does not give permission to serve food.
| Layer | What it may cover | Best starting point |
|---|---|---|
| Federal | EIN, federal taxes, and licenses for federally regulated activities | IRS and the federal agency that regulates the activity |
| Illinois | Entity filing, tax registration, employer accounts, professional licenses, liquor, child care, and other state programs | Illinois DCEO, Secretary of State, IDOR, IDES, IDFPR, or the correct state agency |
| County | Assumed names, unincorporated-area licenses, health permits, zoning, building, and county taxes | County clerk, health department, planning office, and revenue office |
| City, village, or town | Local business license, registration, zoning, occupancy, signs, fire review, liquor approval, and activity permits | Municipal clerk, licensing office, planning department, or building department |
The Illinois DCEO Step-by-Step Guide is a useful state starting point. The Illinois Business Information Center can also help owners identify state and local regulatory contacts. Its listed phone number is 800-252-2923.
Illinois state registration steps
1. Form an LLC or corporation only if that is your chosen structure
The Illinois Secretary of State handles corporations, LLCs, limited partnerships, and similar entities. A sole proprietor does not form an LLC merely to get a business license. An LLC is a legal structure, not operating permission.
Search the proposed name and review the current filing choices through the Illinois business entity search and Secretary of State Business Services. Filing fees and annual report rules depend on the entity and can change, so use the fee and instruction pages shown during the official filing process.
After formation, keep the entity in good standing and file required reports. A registered entity can still need local licenses, tax accounts, zoning approval, and professional permits. Our guide on why LLCs may still need business licenses explains this difference.
2. Register an assumed business name when required
Illinois commonly uses the term assumed name instead of DBA. DCEO says a sole proprietor or general partnership using a business name different from the owner’s full legal name must register with the county clerk where the business operates.
LLCs and corporations generally handle assumed names through the Illinois Secretary of State rather than the county clerk. Check the rule for your exact entity and county. County filing fees, publication steps, amendment rules, and renewal practices can differ.
3. Register with the Illinois Department of Revenue
The Illinois Department of Revenue business registration page says businesses conducting business in Illinois or with Illinois customers must register when the listed tax responsibilities apply. This can include retailers, employers, lessors, and businesses subject to special taxes.
The main online route is MyTax Illinois. Select the option to register a new business using Form REG-1. IDOR currently says an online registration is usually processed in about one to two business days. Mailed registration takes much longer. Register before making purchases or sales or hiring an employee when the requirement applies.
If approved, IDOR may issue a Certificate of Registration or License and an Illinois account ID. This is a state tax document. It is not a city business license, zoning approval, or certificate of occupancy.
4. Understand resale documents
Illinois does not use the words seller’s permit in exactly the same way as every other state. A retailer may receive an IDOR Certificate of Registration for sales tax duties. A resale certificate is a different document used to support a qualifying purchase for resale.
IDOR provides information on Form CRT-61, Certificate of Resale. Do not use a resale certificate for equipment, supplies, or items the business will use. Read our seller’s permit versus business license guide for the basic difference.
5. Register as an employer when you hire
The Illinois Department of Employment Security says a newly created employing unit must register with IDES within 30 days after starting business. Registration can be completed through MyTax Illinois or with the form listed by IDES.
Illinois employers must also report new employees to the state New Hire Directory within 20 days of the employee’s first day on payroll. Use the current IDES new hire reporting instructions.
Most Illinois employers also need workers’ compensation insurance. The Illinois Workers’ Compensation Commission says the law covers almost everyone hired or whose employment is localized in Illinois, with limited exceptions and opt-out rules for certain owners.
| State item | Common trigger | What it does not replace |
|---|---|---|
| Secretary of State entity filing | You form an LLC, corporation, LP, LLP, or similar entity | Local licenses, zoning, tax registration, or industry permits |
| County or state assumed name | You use a name different from the legal owner or registered entity name | Entity formation or permission to operate |
| IDOR registration | You have Illinois tax duties, make taxable sales, lease property, or withhold employee tax | City license, health permit, or occupancy approval |
| IDES registration | You become an Illinois employer | Payroll tax work, workers’ compensation, or labor-law duties |
| Professional license | You or the business provides a regulated professional service | Local land-use and business requirements |
County and city rules may be the real business-license step
Illinois local rules are not uniform. One city may require a broad business license. Another may license only selected activities. A county may control the rules only in unincorporated areas. Always use the government that has jurisdiction over the physical address.
| Illinois example | What the official source says | Practical lesson |
|---|---|---|
| Chicago | The Department of Business Affairs and Consumer Protection handles city business licensing and permitting help. | Check the city license type and zoning before opening. See our Chicago business license guide. |
| Unincorporated Cook County | The county requires a General Business License for covered businesses in unincorporated areas. The current period runs March 1, 2025 through February 28, 2027, with a $40 fee. | Verify that the address is unincorporated before applying. See our Cook County guide. |
| Rockford | The city says it does not require every business to have a general license, but it licenses specific activities. | Search by activity, not only for a general license. See our Rockford guide. |
| Peoria | The city says it does not issue a standard general business license but does issue specific licenses, occupational licenses, and property registrations. | Check the permit directory and county or state steps. See our Peoria guide. |
| Naperville | A Business Occupancy Permit is used for a new business taking an existing tenant space without building changes. Name or ownership changes can also trigger an application. | Even without construction, occupancy approval may be required. |
Official local starting points include the Chicago Small Business Center, the Cook County General Business License page, the Rockford business license page, the Peoria permit and license directory, and Naperville’s Business Occupancy Permit page.
Check zoning before signing a lease
A landlord’s approval does not prove that the business use is allowed. Ask the planning or zoning office whether your exact activity is permitted at the exact address. Also ask about occupancy, building work, fire review, signs, parking, outdoor storage, customer traffic, and hours.
What to check for your operating model
| How you operate | Checks that often matter | First call |
|---|---|---|
| Home-based service | Home occupation, zoning, client visits, parking, signs, employees, lease or HOA limits | City or county zoning office |
| Online store from home | IDOR tax registration, assumed name, home rules, inventory storage, product permits, marketplace records | IDOR and local zoning |
| Storefront or office | Zoning, occupancy, building permits, fire review, signs, local license, local taxes | Municipal planning or building office |
| Mobile business | Base location, vehicle rules, each service jurisdiction, vending, health, right-of-way, waste disposal | Each city or county where work occurs |
| Food business | Local health permit, plan review, certified staff, kitchen approval, labeling, temporary-event rules | Local health department |
| Licensed profession | Individual license, business or facility license, ownership limits, continuing education, local zoning | State licensing board and local government |
| Business with employees | EIN, IDOR withholding, IDES, new hire reporting, workers’ compensation, payroll and labor postings | IRS, IDOR, IDES, and insurer |
For a residence-based operation, review our home occupation permit guide. Online sellers can also use our online store license checklist.
Industry-specific Illinois licenses and permits
Professional and occupational work
The Illinois Department of Financial and Professional Regulation licenses many professions and businesses, including barbers, cosmetologists, salons, real estate professionals, accountants, collection agencies, locksmiths, private detectives, roofers, health professionals, and financial service providers.
Use the IDFPR professions and industries list to find the correct application, rules, renewal page, and license lookup. IDFPR is moving license types into its CORE system in phases, so follow the profession-specific page rather than assuming every application uses the same portal.
Food and cottage food
For restaurants, food trucks, bakeries, groceries, shared kitchens, temporary booths, and similar operations, the local health department is usually the first practical contact. The Illinois Department of Public Health retail food page directs new food businesses to the local health department where they plan to operate.
Cottage food is a separate path. IDPH says a cottage food operator must register with the local health department where the operator lives. Read the current Illinois cottage food requirements before selling. A home kitchen is not automatically approved for every food.
Alcohol
Alcohol sellers may need both local and state approval. The state retail application asks for local liquor license information. Start with the city or county liquor authority, then follow the current Illinois Liquor Control Commission licensing process. Do not sell alcohol before every required license is active.
Child care
Day care centers, day care homes, and group day care homes may need licensing through the Illinois Department of Children and Family Services. Use the DCFS child care licensing overview and contact the licensing office before caring for children. Local zoning, fire, building, and health rules may also apply.
Other regulated activities
Extra state or local rules can apply to cannabis, transportation, motor fuel, weights and measures, animal-related businesses, pesticides, environmental emissions, waste, gaming, tobacco, firearms, adult entertainment, hotels, short-term rentals, contractors, and public-way vending. Search the actual activity and ask the Illinois Business Information Center which agency controls it.
Federal requirements
An EIN is a federal tax identification number. It is not a business license. The IRS EIN page lets eligible applicants apply directly for free. Avoid websites that charge for a number the IRS provides without a fee.
Some activities need a federal license or permit, including certain work involving alcohol production, firearms, aviation, interstate transportation, broadcasting, wildlife, agriculture, or commercial fishing. Use the SBA federal license and permit guide to identify the correct agency.
Beneficial ownership reporting rules changed. FinCEN currently says entities created in the United States and their beneficial owners are exempt from BOI reporting. Certain foreign entities registered to do business in the United States may still have duties. Check the current FinCEN BOI page rather than relying on an older checklist.
Costs, processing time, and renewals
There is no single Illinois business license price. Costs come from separate filings. You may pay for an entity filing, county assumed name, city license, occupancy permit, health plan review, inspection, professional license, sign permit, liquor license, or other approval.
- Confirm whether the fee is an application fee, license fee, inspection fee, or all three.
- Ask whether the fee is refundable if zoning or another approval fails.
- Check whether the license follows the calendar year, a fixed local period, or the original issue date.
- Ask whether each location, vehicle, booth, professional, or owner needs a separate license.
- Save the renewal date, account number, login, receipt, and certificate.
Do not copy a fee or deadline from another city. Even within Illinois, local license periods and penalties differ. State professional renewal dates also differ by profession.
What to ask an Illinois agency
“I plan to operate a [business type] at [full address]. I will [describe products and services], and I will operate from [home, storefront, vehicle, online, or customer sites]. Customers [will or will not] visit. I expect to [sell taxable goods, serve food, sell alcohol, hire employees, use signs, or store inventory]. Which licenses, registrations, zoning approvals, inspections, and renewals apply before I open?”
Ask the worker to send the official page, form, ordinance, fee schedule, or written checklist. Save the answer with the date and the person’s office.
Common mistakes to avoid
- Assuming an LLC is the license. It is a business structure.
- Using a mailing city to choose the licensing office. Verify the actual jurisdiction.
- Signing a lease before zoning review. The planned use may not be allowed.
- Calling an IDOR tax certificate a local business license. They serve different purposes.
- Using a resale certificate for business-use items. It is for qualifying purchases for resale.
- Ignoring home-business rules. Low customer traffic does not always remove zoning requirements.
- Assuming a marketplace handles every tax duty. Platform collection rules do not replace all registration, filing, local, or product duties.
- Forgetting each work location. A second shop, warehouse, booth, vehicle, or city may create another requirement.
- Following old BOI advice. Use FinCEN’s current rule, not an outdated formation checklist.
- Missing renewals. Put every due date on a calendar and keep contact information current.
Official Illinois help
- Illinois Business Information Center: 800-252-2923
- Illinois Department of Revenue Central Registration: 217-785-3707
- Illinois Department of Financial and Professional Regulation: 1-888-473-4858
- Your county clerk for an assumed name used by a sole proprietor or general partnership
- Your city, village, or county planning office for zoning and occupancy
- Your local health department for retail food or cottage food questions
FAQ
Does Illinois have one general statewide business license?
Illinois’s official startup system uses separate tax registrations, entity filings, assumed names, professional or industry licenses, and local approvals. No single catch-all state license applies to every business.
Do I need an Illinois business license for an LLC?
An LLC filing does not replace licenses or permits. Your LLC may still need IDOR registration, a city or county license, zoning approval, a health permit, or a professional license.
Where do I file a DBA in Illinois?
Illinois usually calls it an assumed name. Sole proprietors and general partnerships using a name different from the owner’s full legal name generally file with the county clerk. LLCs and corporations generally use the Illinois Secretary of State.
How do I register for Illinois sales tax?
Use MyTax Illinois to submit Form REG-1 when Illinois Department of Revenue registration applies. IDOR may issue a Certificate of Registration or License and an Illinois account ID.
Does a home-based business need a license in Illinois?
It may. Local zoning or home occupation rules can apply even when customers do not visit. State tax, assumed name, professional, food, and employer rules may also apply.
Who licenses food businesses in Illinois?
The local health department is usually the first contact for a retail food business. Cottage food operators must register with the local health department where they live and follow current state and local rules.
How long does Illinois business tax registration take?
IDOR currently estimates about one to two business days for an online registration through MyTax Illinois. Mailed applications take much longer. Complex or incomplete applications may take more time.
Do Illinois businesses still have to file a BOI report?
FinCEN currently says entities created in the United States and their beneficial owners are exempt from BOI reporting. Certain foreign entities registered in the United States may still need to report. Check FinCEN for current rules.
Disclaimer
This article is for general information only. It is not legal, tax, financial, insurance, employment, zoning, safety, or professional advice. Rules, fees, forms, agency systems, and local policies can change. Confirm every important requirement with the official agency or a qualified professional before you open, sign a lease, sell, hire, or submit an application. BusinessLicenseGuide.com does not guarantee approval, compliance, timing, cost, or results.
Update notes
Accuracy date: August 1, 2026
Next review: November 1, 2026
This update checked current Illinois, local, and federal agency pages and replaced older or overly broad guidance.