Cook County, IL Business License Guide: Chicago, Suburbs, and County Rules

Cook County business license and tax layer

Cook County is not just a recorder or DBA office. For unincorporated areas, Cook County can be the local licensing and zoning authority.

Cook County General Business License

Cook County says businesses operating in unincorporated Cook County are required to obtain a Cook County General Business License unless an exemption or another county license category applies.

The county describes this license as applying to businesses in unincorporated Cook County that maintain a fixed place of business, own or lease real property for business purposes, or regularly maintain stock of tangible personal property for sale in the ordinary course of business.

As of the official county page reviewed for this article, Cook County listed a $40 license fee for a two-year license period running March 1, 2025 through February 28, 2027, with a listed penalty if the license is not purchased by the stated deadline. Fees, periods, and penalties can change, so readers should confirm the current amount on the official county page before paying.

Cook County Business License Portal

The Cook County Business License Portal is used for certain unincorporated Cook County license applications, including the General Business License, General Liquor License, Alarm Permit License, and Video Gaming License. The portal also points users to an address verification step for unincorporated Cook County.

County taxes and Department of Revenue accounts

Some Cook County taxes are activity-specific. The Cook County Department of Revenue administers home-rule taxes and certain license codes. Its official materials list taxes and fees such as alcoholic beverage, amusement, cigarette, gasoline and diesel fuel, parking, hotel, use, wheel, and other county-administered taxes and fees.

This does not mean every small business owes every Cook County tax. It means businesses in certain activities should check whether a county tax account, return, or portal filing applies. Cook County’s Taxpayer Portal FAQ says businesses subject to amusement tax, alcoholic beverage tax, gasoline and diesel fuel tax, hotel accommodations tax, and parking lot and garage operations tax must use that portal.

Chicago and suburban municipal layer

Cook County contains Chicago and many suburban municipalities. The local license office depends on the exact address and business activity.

If the business is in Chicago

The City of Chicago Department of Business Affairs and Consumer Protection, often called BACP, issues business licenses to businesses operating in Chicago. Chicago’s business license process may include business activity review, zoning review, fees, inspections, and additional requirements depending on the license type.

Start with the official City of Chicago business license application page and the City of Chicago business license types page.

Chicago businesses should not assume the Cook County General Business License is the local license for a Chicago location. Chicago has its own licensing system.

If the business is in a suburban municipality

If your address is inside a suburban city, village, or town in Cook County, check that municipality’s clerk, finance department, business license office, community development department, building department, fire prevention bureau, and zoning office.

Suburban municipalities may use terms such as business license, business registration, occupancy permit, certificate of occupancy, home occupation permit, contractor license, vending license, liquor license, rental license, amusement license, or local tax registration.

Cook County Building and Zoning says properties located in incorporated jurisdictions should contact the applicable local building and zoning authority for permits, zoning certificates, and related matters. That is why the city or village check should happen before a county building or zoning application.

If the business is mobile or works across several towns

Mobile businesses may need to check more than one local authority. A food truck, contractor, landscaper, mobile car wash, event vendor, or pop-up seller may need permission where the business is based and where it actually operates.

For example, a contractor based in unincorporated Cook County but working in a suburb may need county approvals for the home base and municipal permits or contractor registration for the job site. A food vendor may need health approval and event or vending approval for each location.

DBA and assumed business name layer

Illinois commonly uses the term assumed business name for what many people call a DBA.

Cook County assumed business name registration

The Cook County Clerk registers assumed business names for certain businesses that conduct business in Cook County under a name other than the legal name of the owner or operator.

Cook County’s official assumed name materials say the following business types are required to register assumed names with the Clerk’s office under state law:

• sole proprietorships,
• general partnerships, and
• professional services corporations.

Cook County’s materials also say corporations, LLCs, LLPs, limited partnerships, and nonprofit organizations generally do not register assumed names with the Cook County Clerk and should register with the Illinois Secretary of State instead.

Illinois Secretary of State assumed names

Corporations and LLCs that want to use an assumed name should check the Illinois Secretary of State’s Assumed Name Adoptions information. The Secretary of State has separate assumed-name instructions for corporations and LLCs.

Illinois state registrations and taxes

County and city approvals do not replace Illinois state registrations. Many Cook County businesses need one or more state-level registrations.

Business entity registration

If you form or register an Illinois LLC, corporation, nonprofit corporation, limited partnership, or similar legal entity, use the Illinois Secretary of State’s Business Services office. The Secretary of State’s office handles many business entity filings, annual reports, certificates, business searches, and related entity records.

A sole proprietorship or general partnership may not be formed with the Secretary of State in the same way as an LLC or corporation, but it may still need an assumed name filing, tax registration, local license, and permits.

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, subject to some exceptions. IDOR registration may apply to retailers, wholesalers, employers, businesses with withholding obligations, and businesses with other Illinois tax responsibilities.

IDOR allows registration through MyTax Illinois using Form REG-1. If applicable, IDOR issues a Certificate of Registration or License and an Illinois taxpayer ID.

Do not assume Illinois calls this a “seller’s permit.” In Illinois, official wording often uses Certificate of Registration or License, retailers’ occupation tax, use tax, withholding, and other tax-specific terms.

Employer accounts

If you hire employees, you may need federal employer registration, Illinois withholding registration through IDOR, and unemployment insurance registration with the Illinois Department of Employment Security. IDOR notes that MyTax Illinois may also be used for certain Illinois Department of Employment Security registration steps when necessary.

Professional and industry licenses

Some occupations and industries require state licensing before local approval is enough. The Illinois Department of Financial and Professional Regulation handles many professional and business licenses. Its License Lookup can be used to check whether an individual or entity is licensed in covered professions.

Other state agencies may regulate liquor, cannabis, childcare, transportation, health care, motor vehicles, construction trades, environmental activities, and other industries.

Zoning, home occupation, building, fire, health, food, and industry permits

A business license is only one part of the approval stack. In Cook County, the most important extra layers are often zoning, occupancy, building/fire, public health, food, liquor, contractor, and environmental rules.

Zoning and business occupancy in unincorporated Cook County

Cook County Building and Zoning oversees building and zoning matters in unincorporated Cook County and the Forest Preserves of Cook County. Its work includes plan review, permits, inspections, certificates of occupancy, and zoning certifications for properties in its jurisdiction.

The county’s Business Occupancy page says a building may not be constructed or occupied, an existing building may not be expanded or altered or occupied, and a new or changed land use may not be established until a certificate of occupancy is issued by the Department of Building and Zoning.

For home-based businesses in unincorporated Cook County, the same page describes home occupation as an occupation or profession practiced by a member of the family residing on the premises that is clearly incidental and secondary to residential use. It also says the homeowner must submit an affidavit to establish a home-based business.

Building permits

Cook County’s Building Permit Applications page says all work in unincorporated Cook County, other than ordinary repairs covered by the county building code exception, requires a permit application. The county also provides an E-Permits page for several permit types, but it warns that permits cannot be processed for properties in Chicago or incorporated suburban cities and villages.

If the business is inside Chicago or a suburban municipality, contact that city or village building department instead of submitting a Cook County unincorporated permit application.

Fire review

Fire review can depend on the city, village, fire district, building type, use, occupancy load, and business activity. Restaurants, daycare facilities, assembly spaces, salons, warehouses, repair shops, and businesses using flammable materials may need fire approval before opening.

Ask the local building department, fire prevention office, or fire protection district which inspection applies before signing a lease or starting construction.

Food businesses and cottage food

The Cook County Department of Public Health retail food establishment page says CCDPH inspects retail food establishments, issues licenses and permits for unincorporated areas, responds to complaints, investigates foodborne illness, and registers cottage food vendors.

The same official page says that for food establishment licenses or permits in other areas of Cook County, applicants should contact their local health official. This is especially important in Chicago and suburban municipalities that have their own health or inspection process.

Liquor

The Cook County Liquor Commission regulates licensing and sale of alcohol in unincorporated Cook County. Its official page says the liquor application process can include publication fees, fingerprint fees, proof of liquor liability insurance, and inspections from Cook County Building and Zoning, Cook County Health, and the Sheriff’s Department before licensure. It also says a licensee must obtain a concurrent State of Illinois liquor license after local Cook County authorization.

Inside Chicago or another municipality, check that city or village’s liquor licensing process and the Illinois Liquor Control Commission.

Contractors and construction trades

Cook County’s Contractor Registration page says all contractors performing work in unincorporated Cook County are required to register with the Cook County Department of Building and Zoning. Depending on the trade, contractors may also need insurance, bonds, state licenses, or other documentation.

Municipalities may have their own contractor registration or licensing requirements. A contractor working across Cook County should check each city or village where work is performed.

Demolition, asbestos, and environmental permits

The Cook County Department of Environment and Sustainability handles demolition permitting through its electronic permit processing portal. Its official page says a demolition permit is needed if wrecking or removing or disturbing a load-supporting or load-bearing structural member of a building. It also describes asbestos inspection documentation and demolition debris diversion requirements.

For unincorporated Cook County, a demolition building permit may also be required from Cook County Building and Zoning. For a city or village property, ask both the local building department and the Cook County environmental office what is required.

Common Cook County business situations

Storefront, office, or warehouse in unincorporated Cook County

Check the Cook County General Business License, business occupancy, zoning, building permits if any work is planned, IDOR tax registration, assumed name or entity registration, and industry permits.

Storefront, office, or warehouse in Chicago

Start with Chicago BACP, Chicago zoning, Chicago inspections, and any Chicago license type for your business activity. Also check Cook County assumed name rules if you are a sole proprietor or general partnership using an assumed name, plus Illinois state tax and entity rules.

Business in a suburban city or village

Start with that municipality. Ask whether it requires a business license, business registration, certificate of occupancy, zoning approval, fire inspection, health permit, contractor registration, vending approval, liquor license, or local tax registration.

Home-based business

If the home is in unincorporated Cook County, check Cook County’s home-based business occupancy affidavit process and zoning rules. If the home is inside Chicago or a suburb, check the city or village home occupation rules. Also check whether customers, employees, signage, inventory, deliveries, food preparation, noise, parking, or hazardous materials are allowed at the home.

Online seller, freelancer, consultant, or creator

An online business may still have a local home base. Check the home address jurisdiction, assumed name rules, Illinois Department of Revenue registration, and any professional license. If you store inventory, receive customers, have employees, or use a commercial space, the local requirements may be greater.

Food business, caterer, cottage food seller, or food truck

Check the local health official, Cook County Department of Public Health if applicable, Illinois food rules, zoning, commissary or food preparation rules, mobile vending rules, event permits, and the city or village where sales occur.

Contractor, handyman, remodeler, or trades business

Check state professional or trade licensing, Cook County contractor registration for unincorporated work, municipal contractor registration where work is performed, building permits, bonding, insurance, and whether the business address itself needs a local license or zoning approval.

Short-term rental or lodging business

Short-term rental rules are highly local. Chicago has its own shared housing registration and short-term rental rules. Suburban municipalities may have their own rental, lodging, zoning, or hotel tax rules. In unincorporated Cook County, also check whether any county business license, zoning, residential rental license, health, building, fire, or county tax issue applies.