How to Convert a Sole Proprietorship to an LLC

Choose and Check Your LLC Name

Your sole proprietorship's name may not be available as an LLC name if another business already filed it with your state, and every state requires an LLC name to include "LLC" or a similar designator. Check your state's business name database before filing, and decide whether you'll keep operating under your existing trade name as a DBA (fictitious name) registered to the new LLC, or adopt the LLC's legal name for customer-facing use going forward.

File Articles of Organization

The LLC doesn't legally exist until your state approves this filing, generally called Articles of Organization or a Certificate of Organization. State filing fees range from $35 in Montana to $500 in Massachusetts. You'll also need to name a registered agent with a physical street address in the formation state, since every state requires one.

Determine Whether You Need a New EIN

The IRS says a sole proprietor can keep the same EIN after converting to a single-member LLC, as long as the LLC doesn't elect corporate or S corporation tax treatment, has no employees, and owes no excise tax. If you're bringing on a co-owner and forming a multi-member LLC instead, the IRS requires a new EIN, since a multi-member LLC is taxed as a partnership by default. If you're unsure which applies, apply for a new EIN anyway; it's free and avoids ambiguity with your bank or vendors about which entity the number belongs to.

Retitle Business Assets Into the LLC's Name

Anything the sole proprietorship owned in your personal name, equipment, vehicles, real estate, trademarks, or domain names, doesn't automatically transfer to the LLC just because you filed Articles of Organization. Prepare a bill of sale or assignment for personal property and intellectual property, and a deed for any real estate, moving ownership from you individually to the LLC. Keep these documents with your LLC's records, since they're what establishes the LLC actually owns what the business uses.

Open a New Business Bank Account

A sole proprietor's bank account is typically opened under their own Social Security number; once the LLC exists, open a new account in the LLC's name using its EIN. Move the business's operating funds into the new account and start running all business income and expenses through it, keeping the LLC's finances separate from your personal finances going forward, which matters for maintaining the liability protection the LLC is meant to provide.

Update Licenses, Permits, and Contracts

Business licenses, permits, and a sales tax registration issued to you as a sole proprietor usually aren't automatically transferable to a different legal entity; check with each issuing agency about whether you need a new application or simply an update. Existing contracts with customers, vendors, or a landlord were signed by you individually, not the LLC, so update or formally assign them to the LLC where the other party agrees, and have new contracts going forward signed in the LLC's name.

Notify the IRS and Your State Tax Agency

Beyond the EIN question, update your state's tax registration, for sales tax or employer withholding, to reflect the new LLC as the entity responsible going forward. If you'll have employees, register the LLC with your state's unemployment insurance agency even if you already had this registration as a sole proprietor, since the responsible entity has changed.

Set a Clear Conversion Date

Pick and document the date the LLC takes over business operations, ideally matching the date your Articles of Organization were approved or a date shortly after. This date matters for figuring out which entity, you individually or the LLC, is responsible for a given invoice, contract, or liability, so keep it consistent across your bank records, contracts, and tax filings.

The LLC Doesn't Protect You From What Already Happened

Forming an LLC shields your personal assets from the business's future debts and lawsuits, but it doesn't retroactively cover liabilities the sole proprietorship incurred before the conversion. A debt, lawsuit, or tax liability tied to the business before the LLC existed is still yours personally.

Talk to a Tax Professional About the Timing

Converting partway through a tax year means your income for that year may need to be reported partly as sole proprietor income and partly through the LLC, depending on its tax classification. A tax professional can help you sort out the filing for the transition year specifically, rather than assuming it works the same as a full year under either structure.

Keep the Old and New Records Separate

Maintain clear records showing which invoices, expenses, and contracts belonged to the sole proprietorship versus the LLC, especially around the conversion date. This separation matters if a bank, buyer, or auditor later needs to understand which entity was responsible for a specific transaction.

Insurance Policies Need Updating Too

Business insurance, including general liability or professional liability coverage, is often written to a specific named insured. Update your policy to name the LLC once it's formed, since a policy still listing you personally as a sole proprietor may not respond the way you expect to a claim against the LLC.

Give Yourself a Realistic Timeline

Between state processing time, getting a new EIN, retitling assets, and updating licenses and contracts, a full conversion often takes several weeks rather than a single afternoon. Plan the conversion around a natural lull in the business, rather than in the middle of your busiest season, so the transition doesn't interrupt operations.

Decide Whether a Registered Agent Service Makes Sense

You can act as your own registered agent in most states if you have a qualifying street address there, the same way many sole proprietors operate from home. A paid registered agent service adds a layer of privacy, since the agent's address appears on the public record instead of yours, and keeps the LLC in good standing with reminders for state filings.