Converting a sole proprietorship to an LLC in Illinois

There is no conversion filing

Illinois does not offer a statutory conversion that turns a sole proprietorship into an LLC. A sole proprietorship is not a separate entity in the first place. It is you, doing business. There is nothing registered to convert. So the process starts the way any LLC formation starts: choose a name, file Articles of Organization with the Secretary of State, appoint a registered agent, and pay the filing fee. The day the Articles are accepted, the LLC exists. Everything after that is moving your business life into it.

Step 1: Form the LLC

File the Articles of Organization and set up the pieces a new LLC needs. Pick a name that meets the Illinois naming rules and is distinguishable from other registered names. Designate your registered agent, someone with an Illinois street address who can receive legal papers. Sign a single-member operating agreement even though the state does not require you to file it. Banks ask for it, and it documents that the LLC is a real, separate entity. Our start an LLC guide walks through each of these steps in order.

Step 2: Move the money

Open a business bank account in the LLC's name and run all business income and spending through it from a set date forward. This is the step that makes the conversion real. A sole proprietorship's money and your money were legally the same. The LLC's money is not, but only if you treat it that way. Close or repurpose the old account, update payment processors and invoicing tools to the LLC's name and details, and tell regular clients where to send payment now. Commingling after conversion is the fastest way to weaken the liability protection you converted for.

Step 3: Move contracts, licenses, and assets

Contracts signed in your own name do not automatically follow the business into the LLC. Review your client agreements, leases, and vendor contracts. Many need an assignment, an amendment, or a fresh signature from the LLC. Licenses and permits are similar. A license issued to you personally generally does not transfer to a new entity, so check each one and reapply where required. Physical assets and equipment move by a simple written assignment from you to the LLC. Keep the paperwork. If the LLC's separateness is ever questioned, this paper trail is the evidence.

Step 4: Update your registrations

Register the LLC with the Illinois Department of Revenue or update your existing registration so state tax accounts match the new entity. If you collect sales tax, your registration has to reflect the LLC. On the federal side, an EIN question comes up. The IRS generally requires a new EIN when a sole proprietor forms an LLC that has employees, and the safest course is to confirm your situation before you file taxes under the old number. Your assumed name filing, if you had one as a sole proprietor, belongs to the old operation. The LLC trading under a different name files its own assumed name paperwork.

What changes, and what does not

The LLC is a separate legal entity, which is the point. Liability for business debts generally stops at the LLC, with the usual exceptions for personal guarantees, your own wrongful acts, and taxes you are personally responsible for. Taxes change less than most people expect. A single-member LLC is disregarded by default, so profits still land on your personal return, still carry self-employment tax, and still face the Illinois 4.95 percent individual rate. What you gain is the legal separation and the option to elect different tax treatment later. What you take on is upkeep: an annual report every year, a registered agent to maintain, and cleaner bookkeeping than a sole proprietorship demands.

When to make the switch

Owners usually convert when revenue becomes steady, when a client requires it, when they sign a lease or a contract with real exposure, or when they hire. There is no deadline and no penalty for converting later rather than sooner. The one timing rule that matters is simple: convert before the risky contract, not after. Liability protection covers what the LLC does from formation forward. It does not reach back over your sole proprietor years.

Not sure the LLC is the right move yet? Compare the two structures side by side in our sole proprietorship vs. LLC guide, or walk through the costs before you file.