Switching from a sole proprietorship to an LLC affects more than your business name. It may require a new EIN and impact your bank account and contracts.
To switch from sole proprietor to LLC, you file Articles of Organization with your state, get a new EIN, and set up a registered agent. Your LLC approval will be issued within a few days.
But the part that catches people off guard comes after approval. Your old bank account doesn't move over. Your contracts don't move over. Even your business name needs a second look before it becomes official under your new LLC.
We'll walk through how to switch from sole proprietor to LLC, then go through exactly what changes and what doesn't.
Stay tuned to learn more.
Key Takeaways
Filing itself is fast, usually a few days to a few weeks, depending on your state's processing time.
The real work happens after approval: your EIN, bank account, and contracts each need to be updated separately; they don't transfer on their own.
Most states let you keep your business name as your LLC name, as long as it's available in the LLC registry, not just the sole proprietor or DBA registry.
Total cost is mostly your state's filing fee, plus whatever ongoing annual report or franchise tax your state charges to keep the LLC active.
How Do You Switch From Sole Proprietor to LLC?
Switching means forming a brand-new legal entity with your state, not upgrading your existing one. That means:
- Choosing a business name
- Filing Articles of Organization
- Appointing a registered agent
- Getting a new EIN from the IRS
- Opening a Business Bank Account
Your state's exact filing fee, document name, and processing time vary. We've broken those down state by state if you want the specifics for where you're forming: start your LLC formation online.
Once your LLC is approved, the state considers its job done. They won't automatically close out your old sole proprietorship records, transfer your assets, or transition your name; that part is entirely up to you. Here is what that cleanup actually looks like. [1]
Do You Need a New EIN If You Change From Sole Proprietor to LLC?
This is the one most people get wrong. The IRS treats your new LLC as a separate legal entity from your sole proprietorship, even if you're the only owner and nothing else about the business changes.
If you form a single-member LLC and don't elect to be taxed as a corporation, don't hire employees, and don't owe excise tax, the IRS technically lets you keep using your old EIN. But most banks, vendors, and accountants will ask for a new one anyway, because mixing your old sole prop EIN into your new LLC's records makes for a messy paper trail later. [2]
You will need a new EIN if you elect S-corp or C-corp tax treatment, add a second owner, or hire staff. You cannot transfer your old EIN to the new LLC. The IRS will not reassign it. Applying for a new one online takes about 15 minutes, and you can get it immediately. [3]
Also, read our guide on How to Apply for an EIN online
Can You Keep Your Business Name When You Switch to an LLC?
If you were operating under a DBA (doing business as) name as a sole proprietor, that DBA does not automatically belong to your LLC. It was registered to you personally, not to your new entity.
Check your state's business name database first to confirm your name is available as an LLC. If it is, you'll register it as your official LLC name during formation instead of keeping the old DBA structure. If you want to operate under a different name than your LLC's legal name, you'll file a new DBA under the LLC itself.
Either way, your old sole proprietor DBA needs to be formally closed out in most states, or it'll sit on record next to your new LLC with no purpose.
How to keep your business name
- Search your LLC name in the state's database.
- Reserve the name if needed.
- Register it as your LLC name when filing.
- File a new DBA under the LLC if you plan to operate under a different public-facing name.
Looking to generate a unique LLC name? Use our free business name generator tool!
What Happens to Your Business Bank Account When You Convert?
You cannot keep using your sole proprietorship bank account for your LLC. Once your LLC is legally a separate entity, mixing its money with your personal or old sole prop account undermines the entire reason you formed it. This can pierce the corporate veil created by the LLC formation. It means a court could decide your LLC isn't really separate from you, which erases the liability protection you just paid for.
Opening a new business bank account under your LLC's name and EIN is not optional. Most banks will ask for your Articles of Organization and EIN confirmation letter. Plan for this before you close your old account, not after.
Further reading: Read our guide on how to open a business bank account
What Happens to Existing Contracts When You Convert to an LLC?
Contracts you signed as a sole proprietor were signed by you, personally. Your new LLC did not exist when those agreements were made, so it isn't automatically a party to them.
For ongoing client work, this usually means one of two things. Either you let existing contracts run out under your old name and start new ones under the LLC, or you formally assign the contract to your LLC with the client's written agreement.
Skipping this step means you're still personally liable on paper for work your LLC is doing in practice, which defeats the point of converting in the first place.
How to update your contracts
- Review active agreements.
- Decide whether to assign or replace each contract.
- Obtain written consent if an assignment is required.
- Use the LLC name for all new agreements.
Do You Need to Update Your Website or Domain?
Your domain name, website, and social accounts don't need to change if your LLC keeps the same business name. What needs to change is the fine print. Your website's terms of service, invoices, and any "doing business as" disclosures should reflect your LLC's legal name going forward, not your old sole proprietor name.
This is a low-effort update most people forget, and it's the kind of detail that matters if a client or vendor ever disputes an invoice.
Do Your Business Licenses and Permits Transfer to Your LLC?
Business licenses and permits are typically issued to a specific legal entity, not to you as a person. That means your city or state business license, seller's permit, or industry-specific permit may need to be reissued under your LLC's name.
Check with the licensing agency directly. Some allow a simple name change on file. Others require a brand-new application. Either way, don't assume your existing license quietly carries over.
Tip: Use Swyft Filings' Business License Research service to find out which state, federal, or local business licenses your LLC needs.
Need Help Making the Switch?
At Swyft Filings, our business formation specialists handle the state filing, registered agent setup, and EIN application so you can focus on the other important parts of the switch, like updating contracts and moving your bank account.
Tell us about the business you want to build, and we will handle the paperwork for you!
Bibliography
- U.S. Small Business Administration. Choose a Business Structure. Accessed July 4, 2026.
- Internal Revenue Service. Single-Member Limited Liability Companies. Accessed July 4, 2026.
- Internal Revenue Service. Do You Need a New EIN? Accessed July 4, 2026.
