How to Convert Your Sole Proprietorship into an LLC

Yes, you can convert a sole proprietorship into an LLC. The process involves filing Articles of Organization with your state, getting a new Employer Identification Number (EIN) from the IRS, and updating your contracts, licenses, and bank accounts. The exact steps and fees vary by state, so check your state's requirements before you start.

The main reason to convert is liability protection. As a sole proprietor, there's no legal separation between you and your business — if your business gets sued or can't pay its debts, your personal finances are fair game. An LLC creates that separation, so your home, car, and savings stay out of reach in most situations.

Beyond protection, forming an LLC can also strengthen how your business looks to customers and vendors. A registered LLC signals that you're running a real, accountable business — and that matters when you're signing contracts, applying for financing, or bidding on larger projects. Most business owners who make the switch say they wish they'd done it sooner.

There's no single federal conversion process — you're essentially forming a new LLC and then transferring your business activity into it. Each step below has real requirements, and a few have details that catch people off guard. Work through them in order.

Step 1: Choose a business name

Your LLC name needs to be available in your state and must include a designator like "LLC" or "Limited Liability Company." Search your state's Secretary of State website to check availability before you file — most states offer a free online search tool. If you want to lock in a name before you're ready to file, some states let you reserve it for 30 to 120 days for a small fee.

Also run a federal trademark search at the USPTO to make sure the name isn't already protected at the national level. A name that's available in your state can still create trademark problems if someone else owns it federally.

Step 2: Update your contracts

Any contracts you signed as a sole proprietor were signed in your personal name. Once your LLC is formed, new contracts need to be signed in the LLC's name — not yours. Review existing agreements with customers, vendors, and landlords and update the contracting party to your LLC. A legal professional can help you figure out which contracts need formal amendments versus which ones can be handled with a simple notice.

Step 3: File Articles of Organization

Filing Articles of Organization with your state's Secretary of State (or equivalent agency) is the step that legally creates your LLC. The form typically asks for your LLC's name, its purpose, the name and address of your registered agent, and whether the LLC will be member-managed or manager-managed. State filing fees vary — check your state's website for the current amount.

Step 4: Write an LLC operating agreement

Not every state requires a written operating agreement, but every LLC should have one. The operating agreement sets out how the business is owned, how decisions get made, and how profits are distributed. For a single-member LLC, it also helps prove that your business is genuinely separate from you personally — which matters if your liability protection is ever challenged in court.

Step 5: Apply for a new EIN

Your LLC is a new legal entity, so it needs its own Employer Identification Number (EIN) — even if you already have one as a sole proprietor. Apply using IRS Form SS-4 through the IRS website. Online applications are processed immediately and the EIN is issued the same day. The online application is available Monday through Friday, 7 AM – 10 PM ET. The application is free.

Step 6: Open a business bank account

Opening a dedicated business bank account in your LLC's name is one of the most important things you can do to protect your liability shield. Without it, a court could decide your business isn't really a separate entity — and at that point your personal finances are fair game. To open the account, you'll need your Articles of Organization, your new EIN, and your operating agreement.

Step 7: Update your business licenses and permits

Licenses and permits issued to you as a sole proprietor don't automatically transfer to your LLC. Contact each issuing agency — city, county, state, or federal — and update the business name and entity type. Some licenses need to be reissued entirely. Check with your state and local agencies to figure out which ones apply to your business type.

There's no single right moment, but a few situations make the case clearly. If your business is generating consistent income, working with clients under contract, or carrying any risk of liability — a customer injury, a dispute over deliverables, a vendor claim — the protection an LLC provides is worth the filing cost. The longer you wait, the more exposure you carry.

If you're running the business full time and it's your primary income, that's a strong signal to act. The state filing fee is a one-time cost. The liability exposure of staying a sole proprietor is ongoing. A tax professional can help you figure out whether the timing also makes sense from a tax perspective, since the switch can affect how you file at the end of the year.

If you've been operating under a DBA ("doing business as") name as a sole proprietor and want to use that same name for your LLC, you'll need to cancel or withdraw the existing DBA registration first. A DBA registered to you personally doesn't carry over to your LLC automatically — the LLC is a separate legal entity and needs its own name registration.

Check with your county clerk or state agency to figure out the cancellation process for your existing DBA. Then, once your LLC is formed, you can register the same name as a DBA under the LLC if you want to keep using it without including "LLC" in your public-facing name.