Contact Department of Commerce and Economic Opportunity

Please contact the Department of Commerce and Economic Opportunity’s (DCEO) Business Information Center by telephone:

(800) 252-2923

or by email:

ienconnect@mailmw.custhelp.com

Doing Business in Illinois


7-Step Plan That Works for You!

  1. 1. Select a business structure that works best for your needs. These include sole proprietorship, general and limited partnership, limited liability partnership, a limited liability company, and S and C corporations. Please click here to obtain forms for each business structure option.
  2. 2. Register the business name with your county clerk.
  3. 3. Obtain an Employer Identification Number (EIN) from the Internal Revenue Service through their online application process. Please visit click here for more information.
  4. 4. Obtain federal tax information for your selected business structure. Please click here for more information.
  5. 5. Register and license your business with the Illinois Department of Revenue. Please click here for more information.
  6. 6. Find out if your city imposes any additional local taxes by contacting your local revenue department.
  7. 7. Obtain a license to practice in your industry if required by the Illinois Division of Financial & Professional Regulation. Please visit the department website at click here for more info.

For further information on Doing Business with the State of Illinois is available online at click Here

For business questions, please contact the Department of Commerce and Economic Opportunity’s (DCEO) Business Information Center at (800) 252-2923 or ienconnect@mailmw.custhelp.com.

Doing Business in Illinois Subcontractor Registration DBE Program Construction-Prequalification as a Prime Contractor Prequalification as a Prime Consultant / Subconsultant Information Exchange Construction / Consultant Mentor Protégé Program Target Market Program Business Statistics Center Other Opportunities Diversity Matters! Newsletter