To organize online, the LLC must meet the following requirements: Limited Liability Company Name The name must include one of the following: Review the Information for Forming an LLC Online.Register your LLC with the Illinois Department of Revenue. All Illinois LLCs are required to register with the Illinois Department of Revenue. You can register electronically using MyTax Illinois, available at mytax.illinois.gov. Enter the name of the LLC in the space in the title. Also enter the name in Article First and in the title of the document on the last page of the form. To start an LLC, you need to file the Illinois Articles of Organization. This gets filed with the Illinois Secretary of State. The first step towards registering your business is to file an article of organization form with your state.