Instructions - Homepage - br How to Form an LLC in Illinois under the Statute 805-180-5-1 where any individual that is a resident, may file a domestic Limited Liability Company to operate within the State.br br Editbr Stepsbr 1 Choose Your Company Name. - Perhaps the most important part of the LLC formation is finding a name for your company. You can check to make sure your name is not taken with the Illinois LLC Search Tool.br 2 File Online or Paper Filing:br 3 Online. - Go to the Illinois website. Follow the steps and pay the filing fee of $600.br 4 Paper. - Download the Illinois Articles of Organization. Fill-out the form and submit with a $500 check payable to the Illinois Secretary of State and send to:br Department of Business Services, Limited Liability Division, 501 S. Second St., Rm. 351, Springfield, IL 62756br br Editbr Tipsbr Must be at least 18 years of age.