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How to Convert a Sole Proprietorship to an LLC

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An LLC only protects you once you actually finish becoming one.

Plenty of small business owners assume that filing paperwork with the state is the finish line for turning a sole proprietorship into an LLC. Attorney Aiden Durham, founder of 180 Law Co. and host of the legal education series All Up In Yo’ Business, walks through why that assumption is dangerous — and lays out the specific steps required to actually separate yourself, legally and financially, from your business.

• Durham, a Colorado-licensed business and trademark attorney, breaks down the conversion process for sole proprietors moving into an LLC structure.
• The process requires a new EIN from the IRS — even for owners who already used their personal Social Security number or an individual tax ID as a sole proprietor.
• Durham stresses that filing Articles of Organization is only step one; without new bank accounts and formally transferred contracts, licenses, and assets, the liability shield doesn’t actually hold.

Starting With the Name and the Paperwork

The first move, according to Durham, is picking a business name that’s actually available and distinct from what the sole proprietorship used — and confirming it with the state’s business filing office, typically the Secretary of State. Once the name clears, the owner files Articles of Organization, sometimes called Articles of Formation depending on the state, which is the document that legally creates the LLC. That filing has to include a registered agent, the person or company designated to receive legal and tax notices on the business’s behalf.

Durham also flags the operating agreement as a required piece, not an optional extra. Even for a single-member LLC, she notes that an operating agreement is one of the documents courts look for when deciding whether an LLC’s liability protection is legitimate or just a name on paper.

EIN Cannot Be Transferred

One of the more overlooked details Durham covers is the EIN requirement. A sole proprietor may have operated for years using a personal Social Security number or an individual taxpayer ID for tax filings. None of that transfers to the new LLC. The business needs its own EIN from the IRS, issued to the LLC entity itself, before it can open accounts or file taxes as the new business structure.

Even sole proprietors who already have an EIN or individual tax ID have to get a new one once they convert to an LLC — the old number belonged to the person, not the business.

Separating the Money and the Assets

Durham is direct about the step business owners skip most often: opening dedicated business bank accounts and refusing to commingle personal and business funds. Mixing the two is one of the fastest ways a court can decide to “pierce the corporate veil” and hold the owner personally liable anyway, defeating the entire purpose of forming the LLC in the first place.

Beyond the bank accounts, Durham walks through formally transferring business assets, contracts, client agreements, and any local licenses into the new LLC’s name. A contract still sitting in the sole proprietorship’s name, or a license never re-registered to the LLC, leaves a legal gap — exactly the kind of gap that undermines the liability protection the owner went through all this paperwork to get. Business owners weighing whether this transition is right for their situation can compare the two structures directly in LLC vs Sole Proprietor: Which is best for YOUR business?, and those already running a single-member LLC should check the common missteps outlined in Single Member LLC Mistakes You Should Avoid – 4 Biggies.

The Real Point of the Exercise

Every step Durham outlines circles back to one idea: an LLC only works as a liability shield if the business and the individual are truly, formally separate — new name, new EIN, new bank accounts, new paperwork on every contract and license. Skip any one of those and a court reviewing the business later has an opening to argue the “LLC” was never really operating as its own entity at all.