Download a free Illinois LLC Operating Agreement template (Word, Google Doc, PDF). List LLC Members, profit splits, tax info and more.10. The operating agreement provides for the establishment of one or more series. An Illinois LLC operating agreement is a binding document that establishes a company's ownership, operations, and officers. Illinois requires you to file an initial report after forming your LLC. This article discusses the step-by-step process of writing a LLC operating agreement as effortlessly as possible. An Illinois LLC operating agreement is a legal document that outlines specifics for the business. A business lawyer can represent one owner and negotiate the terms of the operating agreement. If you're one of our customers, you already have access to our operating agreement template. Basic company information.