All LLCs must appoint and maintain a registered agent within Illinois. The company appoints the agent as having the authority to accept the service of process.This system allows you to form or register a Not-for-Profit, Domestic Corporation, or Limited Liability Company or terminate an LLC online. You must register with the Illinois Department of Revenue (IDOR) if you conduct business in Illinois or with Illinois customers. The first thing you will need to do to form an LLC is to complete your Articles of Organization. Then file them with the Secretary of State. This guide will inform you of various legal requirements and direct you to additional resources. This guide to starting an LLC in Illinois provides step-by-step instructions on filing formation documents, obtaining tax IDs, and setting up company records. This easytofollow guide has the information you need to create an Illinois LLC online. Ready to start your business?