Illinois Single-Member LLC: Complete Guide (2026)

Solo Doesn’t Mean Unprotected.

You built this business alone. Protect it properly.

Most single-member LLC owners started the same way: freelancing, consulting, selling something, building something — doing it on their own. At some point someone says “get an LLC.” They Google it, find out it costs $100–$300 depending on the state, and wonder if it’s worth it.

It’s worth it. Right now, if someone claims you damaged their business with your work, or you get sued for any reason — that lawsuit is against you personally. Your bank account. Your car. Your home equity. Everything on the table. With a single-member LLC, that lawsuit is against the LLC. Your personal assets stay out of it — as long as you’ve maintained proper separation: separate bank account, operating agreement, clean records. The LLC takes the hit. You keep your savings. That’s not hypothetical. That’s the entire point.

What most people don’t know: single-member LLCs still need an operating agreement. Even in states that don’t require it, an operating agreement establishes the LLC as a real, separate entity. Without one, courts have found reasons to treat single-member LLCs as indistinguishable from their owner — which destroys the protection. Corp Nation fixes all of this in one step. For $149 plus the Illinois state filing fee: Articles of Organization filed correctly, a Illinois registered agent, EIN obtainment, and a customized single-member operating agreement. Everything you need to open a business bank account, sign contracts, and operate with genuine legal protection. You built the business alone. You don’t have to navigate the legal setup alone. Let Corp Nation handle the paperwork.

Form My Illinois Single-Member LLC — $149 →