Entity formation
The State of Illinois business hub routes readers to Secretary of State corporation and LLC formation services.
The accessible official hub distinguishes entity services from tax, employment and licensing services.
Open State of Illinois high volatility
Atlas does not infer:
This official starting point does not determine applicability, legal form, filing selection, fees, deadlines, tax liability, worker classification, local requirements or outcome for a particular reader.
Assumed name
Illinois distinguishes county assumed-name registration for sole proprietorships and general partnerships from Secretary of State filing for incorporated entities.
The current official step-by-step guide states the county-clerk route and separately identifies the incorporated-entity boundary.
Open Illinois Department of Commerce and Economic Opportunity high volatility
Atlas does not infer:
Do not infer that one assumed-name route applies to every legal form or establishes trademark rights.
Foreign qualification
An out-of-state company within the Illinois INVENT eligibility framework must be registered as a foreign company with authority to transact business in Illinois.
The current official eligibility page identifies Form BCA 13.15 as the foreign-company authority route.
Open Illinois Department of Commerce and Economic Opportunity high volatility
Atlas does not infer:
This program-specific page confirms the state filing route but does not determine whether a particular company must qualify or is eligible for INVENT.
State revenue
The Illinois Department of Revenue registration process covers applicable sales, withholding and other state tax accounts.
The official registration page describes Form REG-1 and MyTax Illinois while preserving tax-specific applicability.
Open Illinois Department of Revenue high volatility
Atlas does not infer:
This official starting point does not determine applicability, legal form, filing selection, fees, deadlines, tax liability, worker classification, local requirements or outcome for a particular reader.
State wage withholding
Illinois generally requires withholding when federal income tax is withheld from compensation paid in Illinois.
The official tax-information page defines the general withholding boundary and registration requirement.
Open Illinois Department of Revenue high volatility
Atlas does not infer:
This official starting point does not determine applicability, legal form, filing selection, fees, deadlines, tax liability, worker classification, local requirements or outcome for a particular reader.
Unemployment insurance
A newly created Illinois employing unit uses IDES registration to determine unemployment-insurance liability.
The official employer page routes registration through MyTax Illinois or Form REG-UI-1.
Open Illinois Department of Employment Security high volatility
Atlas does not infer:
This official starting point does not determine applicability, legal form, filing selection, fees, deadlines, tax liability, worker classification, local requirements or outcome for a particular reader.
Workers compensation
Illinois employers must separately evaluate workers’ compensation insurance duties under the Workers’ Compensation Act.
The official Commission handbook is the state starting point for coverage, employer and claim-system information.
Open Illinois Workers’ Compensation Commission high volatility
Atlas does not infer:
This official starting point does not determine applicability, legal form, filing selection, fees, deadlines, tax liability, worker classification, local requirements or outcome for a particular reader.
New hire reporting
Illinois employers report new hires through the State New Hire Directory framework.
The official page identifies reporting methods and the state reporting framework.
Open Illinois Department of Employment Security high volatility
Atlas does not infer:
This official starting point does not determine applicability, legal form, filing selection, fees, deadlines, tax liability, worker classification, local requirements or outcome for a particular reader.
Charity registration
The Illinois Attorney General publishes charity-registration and annual-report forms and identifies the Charitable Trust Bureau filing path.
The official page distinguishes initial registration, exemptions and annual financial reporting.
Open Office of the Illinois Attorney General high volatility
Atlas does not infer:
This official starting point does not determine applicability, legal form, filing selection, fees, deadlines, tax liability, worker classification, local requirements or outcome for a particular reader.
Licenses and permits
The Illinois business-assistance starting point routes readers to state and local licensing and regulatory resources.
The official state resource identifies planning and agency-routing assistance for new businesses.
Open Illinois Department of Commerce and Economic Opportunity high volatility
Atlas does not infer:
This official starting point does not determine applicability, legal form, filing selection, fees, deadlines, tax liability, worker classification, local requirements or outcome for a particular reader.
Recurring compliance
The current Illinois starting-a-business handbook states that corporations must file annual reports with the Secretary of State.
The official 2026 handbook identifies the corporation annual-report responsibility and Secretary of State route.
Open Illinois Department of Commerce and Economic Opportunity high volatility
Atlas does not infer:
This official starting point does not determine applicability, legal form, filing selection, fees, deadlines, tax liability, worker classification, local requirements or outcome for a particular reader.
Dissolution and withdrawal
Illinois provides a state service route to Corporation and LLC online filings and Business Services forms.
The official Illinois service page routes readers to Corporation and LLC online filings and Business Services forms used for entity lifecycle actions.
Open State of Illinois — Office of the Secretary of State high volatility
Atlas does not infer:
This route does not select dissolution, withdrawal or another closure form and does not determine tax, liability or local wind-up duties.