Do I Need a New EIN When Transitioning from a Sole Proprietorship to an LLC?
Bizee explains whether you need a new EIN when converting from a sole proprietorship to an LLC. Learn the IRS rules, when a new EIN is required, and how to apply.
Bizee Editorial Staff
Editorial Team
Introduction
It depends on how your LLC is taxed. A single-member LLC that stays a disregarded entity for federal tax purposes can keep the existing EIN from your sole proprietorship. But if your LLC has multiple members, elects corporate taxation, or hires employees, you'll need a new Employer Identification Number (EIN).
What an EIN is and why it matters for your business
An Employer Identification Number (EIN) is a 9-digit tax ID the IRS uses to identify a business entity — the business equivalent of a Social Security Number. Sole proprietors, LLCs, and corporations all use an EIN to file taxes, open business bank accounts, hire employees, and set up certain retirement plans.
As a sole proprietor, you may already have an EIN, or you may have been using your Social Security Number (SSN) instead. Either way, forming an LLC changes the picture — because the IRS treats an LLC as a different type of entity, and the tax classification your LLC carries determines whether your existing EIN still applies.
Most people don't realize the EIN question isn't really about the LLC itself — it's about how the LLC is classified for federal taxes. That distinction is what drives the answer.
When you need a new EIN after forming an LLC
Whether you need a new EIN depends on your LLC's tax classification. The IRS sets the rules, and the answer isn't the same for every LLC.
Single-member LLC taxed as a sole proprietorship (disregarded entity)
If you form a single-member LLC and don't make any tax classification election, the IRS treats it as a disregarded entity — meaning it's taxed the same way as a sole proprietorship. In that case, you can keep using your existing EIN. The IRS does not require a new one.
That said, getting a new EIN for your LLC is still worth considering. It keeps your LLC's tax records separate from your sole proprietorship history, which makes things cleaner if you're ever audited or apply for business credit.
Single-member LLC electing corporate taxation
If your single-member LLC files Form 8832 to elect taxation as a C Corporation, or files Form 2553 to elect S Corporation status, the IRS treats it as a separate taxable entity. A new EIN is required. The LLC is no longer a disregarded entity — it's a corporation for tax purposes.
Multi-member LLC
A multi-member LLC is taxed as a partnership by default. Because a partnership is a different type of entity than a sole proprietorship, the IRS requires a new EIN. You can't carry over the EIN from your sole proprietorship — even if you're still the primary owner.
Any LLC that hires employees
If your LLC hires employees or needs to file excise or pension plan tax returns, the IRS requires a separate EIN for the LLC — even if you already have one from your sole proprietorship. Using the wrong EIN for employment tax filings can create mismatches in IRS records that take time to untangle.
How to get a new EIN for your LLC
Getting a new EIN is a straightforward process. The IRS offers a free online application at irs.gov/ein that takes about 15 minutes to complete. You'll get your EIN immediately after finishing the application — no waiting.
You'll need to apply as the responsible party for the LLC, have your SSN or existing EIN on hand, and know your LLC's legal name and state of formation. The online application is available Monday through Friday, 7 AM – 10 PM ET.
If you'd rather not handle it yourself, we can get your EIN as part of forming your LLC. Our Standard and Premium packages include EIN filing. If you already have an LLC or used our base package, our standalone EIN service handles it for you.
FAQ
No. The IRS does not transfer or reassign EINs between different business entities. An EIN issued to your sole proprietorship belongs to that entity. If your LLC requires a new EIN — because it's a multi-member LLC, elects corporate taxation, or hires employees — you need to apply for a separate one. You can apply free at irs.gov/ein.
It depends. A sole proprietor needs an EIN if they hire employees, have certain retirement plans, file excise or pension plan tax returns, buy or inherit an existing business, or file for bankruptcy. If none of those apply, you can use your SSN instead. That said, having an EIN keeps your Social Security Number off business documents — which is worth doing even when it's not required.
Yes. An EIN issued to your sole proprietorship is valid and usable for that business. If you later form a single-member LLC that stays a disregarded entity for tax purposes, you can continue using the same EIN. If you form a multi-member LLC, elect corporate taxation, or hire employees through the LLC, you'll need a new EIN for the LLC specifically.
Yes. Sole proprietors, partnerships, and individuals can all get an EIN without forming an LLC. The IRS issues EINs to any business entity or individual who needs one for tax purposes. You don't need to have an LLC — or any formal business entity — to apply.
Not automatically. Forming an LLC with the state doesn't trigger an EIN from the IRS — you have to apply for one separately. Some formation platforms, including Bizee, include EIN filing as part of their formation packages so you don't have to handle it as a separate step. If you form your LLC on your own, apply at irs.gov/ein after your LLC is approved by the state.
Yes. Electing S Corporation status — whether through an LLC filing Form 2553 or by forming a corporation — creates a new taxable entity in the eyes of the IRS. A new EIN is required. The S Corp election changes how the business is taxed and how you pay yourself, so keeping the tax records tied to a separate EIN is both required and practical.
Generally, no. An EIN is tied to a specific business entity, not to you as an individual. If you run multiple businesses as separate legal entities — for example, 2 different LLCs — each one needs its own EIN. If you run multiple sole proprietorships under your own name without forming separate entities, you can use a single EIN across them, but a tax professional can help you figure out the right approach for your situation.
