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Do You Need a New EIN?
A new EIN is required when the structure or ownership of your business fundamentally changes. A new name or a new address does not require one. Here is the rule for every common scenario, by entity type.
Last updated: July 26, 2026
Short Answer
You need a new EIN when the structure or ownership of your business fundamentally changes — not when the name or address changes. Converting a sole proprietorship to an LLC or corporation, adding a member to a single-member LLC, or incorporating a partnership all generally require a new number. Renaming the business, moving states, or opening a second location do not. Your existing EIN stays with the entity it was issued to.
The IRS ties an EIN to a legal entity, not to a name, an address, or a location. That single principle answers most of these questions. When the entity itself is genuinely a different entity in the eyes of the IRS, a new EIN follows. When the same entity simply looks different on paper, the old number carries on. This guide walks through each common change and gives the rule by entity type.
The Rule
When Do You Need a New EIN?
You need a new EIN when your business changes tax classification, changes legal structure, or becomes a genuinely new entity. You do not need one for cosmetic or administrative changes.
| Change | New EIN required? |
|---|---|
| Business name change | No |
| Business address or state move | No |
| Adding a location or DBA | No |
| Sole proprietorship converts to LLC or corporation | Yes |
| Partnership incorporates | Yes |
| Single-member LLC adds a member | Yes |
| Corporation receives a new charter from the state | Yes |
| Corporation shareholders change | No |
| Sole proprietor sells the business to a new owner | Yes — the buyer applies |
| Business declares bankruptcy (sole proprietor) | Yes |
The pattern is consistent: a change in how the IRS classifies and taxes the entity triggers a new number. A change in how the entity presents itself does not.
Name Change
Do You Need a New EIN if You Change Your Business Name?
No. A name change never requires a new EIN. The number stays attached to the legal entity, and the entity has not changed — only its label.
You still need to tell the IRS. How you do that depends on entity type: a sole proprietor sends a signed letter, a corporation or partnership can report the change on the next return, and an LLC follows the rule for how it is taxed. The EIN name change guide covers the notification method for each, and changing a business name with an EIN walks through the paperwork.
A DBA or trade name is not a name change at all in the IRS's view. One entity can run several trade names under a single EIN, because a DBA creates no separate legal entity.
Address Change
Do You Need a New EIN if You Change Your Address?
No. An EIN is federal. It follows the entity across every state and every country, so a move never requires a new number.
Update the address on the IRS record instead. File Form 8822-B — the Form 8822-B guide covers every line and both IRS mailing addresses — or see EIN address change for the alternative methods. The IRS charges $0 and takes 4 to 6 weeks.
Two points that catch non-resident owners:
- Moving your US LLC's registered agent to a different state does not require a new EIN, but it may require registering as a foreign entity in the new state. That is a state filing, entirely separate from the IRS.
- If the responsible party changed at the same time as the address, that part carries a 60-day deadline. The address change does not.
Structure Change
Do You Need a New EIN if You Change Entity Type?
Yes, in most cases. Converting from one structure to another usually creates a new legal entity for tax purposes, and a new entity needs its own EIN.
| Conversion | New EIN required? | Reason |
|---|---|---|
| Sole proprietor to LLC | Yes | The LLC is a separate legal entity |
| Sole proprietor to corporation | Yes | Incorporation creates a new entity |
| Partnership to corporation | Yes | The partnership terminates |
| Partnership to LLC | Yes | Tax classification changes |
| Single-member LLC to multi-member LLC | Yes | Disregarded entity becomes a partnership |
| Multi-member LLC to single-member LLC | Yes | Partnership becomes a disregarded entity |
| LLC electing S-corp taxation only | No | Same entity, different election on Form 2553 |
That last row is the exception people miss. An LLC filing Form 2553 to be taxed as an S-corporation keeps its EIN, because the entity has not changed — only its tax election has. See S-corp election for how that filing works.
Ownership
Do You Need a New EIN if Ownership Changes?
It depends entirely on entity type. Ownership changes are the least intuitive category, because the same event produces different answers for different structures.
Corporation: shareholders change
Sole proprietorship: sold to a new owner
LLC: membership changes
Partnership: partners change
If ownership of your US LLC changed hands, the responsible party on the IRS record almost certainly changed with it. That update is due within 60 days regardless of whether a new EIN is required — see responsible party on an EIN.
By Entity Type
What Are the Rules for Each Entity Type?
The same change produces different answers depending on the structure it happens to. This table reads the rules by entity rather than by event.
| Scenario | Sole proprietor | Partnership | LLC | Corporation |
|---|---|---|---|---|
| Name change | No | No | No | No |
| Address change | No | No | No | No |
| New location added | No | No | No | No |
| Owner or member changes | Yes | Depends | Depends | No |
| Converts to another entity type | Yes | Yes | Yes | Yes |
| New state charter issued | n/a | n/a | n/a | Yes |
| Tax election only (Form 2553) | n/a | n/a | No | No |
| Bankruptcy | Yes | No | No | No |
Confirm before you reuse an old EIN
Filing a return under an EIN that no longer matches your entity's structure creates a mismatch the IRS has to unwind, and it can delay refunds and notices. When a change sits in a "depends" cell above, confirm your specific facts with a US CPA before reusing the old number. ein.so files EINs and does not provide tax advice.
Next Steps
How Do You Get a New EIN?
You apply on Form SS-4, the same form used for a first EIN. Nothing about a second or third EIN application is different.
Confirm you actually need one
Complete Form SS-4
File by the method available to you
Close out the old entity if it stopped operating
Non-US residents cannot use the IRS online tool, because it requires an SSN or ITIN. ein.so files Form SS-4 by fax for $49 Standard (4-7 business days) or $97 Express (2-3 business days), with no SSN required.
Related guides: EIN name change | Change a business name on an EIN | EIN address change | Form 8822-B guide | Multiple EIN numbers | EIN cancellation.
Frequently Asked Questions
Do you need a new EIN if you change your business name?
No. A name change never requires a new EIN. The same 9-digit number stays with the entity. You report the new name to the IRS, either on your next tax return or by letter, depending on entity type. The EIN is tied to the legal entity, not to the name printed on it.
Do you need a new EIN if you move to another state?
No. An EIN is federal and follows the entity across all 50 states. Moving your business or registered agent does not require a new number. File Form 8822-B to update the address on the IRS record. You may still need to register as a foreign entity in the new state, which is a separate state-level filing.
Do you need a new EIN when converting a sole proprietorship to an LLC?
Usually yes. The IRS treats the LLC as a new legal entity separate from the sole proprietorship, so a new EIN is generally required. The old sole-proprietor EIN stays attached to the old entity and is not reused by the LLC. Confirm your specific situation before reusing any prior number.
What happens to my old EIN when I get a new one?
The old EIN stays permanently assigned to the old entity and is never reissued to anyone else. The IRS does not delete or recycle EINs. If the old entity has stopped operating, you can close the associated business account with the IRS in writing, but the number itself remains retired.
Can two businesses share the same EIN?
No. Each legal entity needs its own EIN. A single entity can operate several trade names or DBAs under one EIN, because a DBA is not a separate legal entity. Two separate LLCs, however, need two separate EINs even when the same person owns both.
Does a new owner need a new EIN?
It depends on the entity type. A corporation keeps its EIN when shares change hands. A sole proprietorship cannot transfer its EIN, so a new owner applies for their own. For an LLC, the answer turns on whether the change alters how the IRS taxes the entity, such as a single-member LLC gaining a second member.
Do you need a new EIN if your LLC adds a member?
Generally yes. A single-member LLC taxed as a disregarded entity that adds a second member becomes a partnership for tax purposes, which is a change in tax classification and generally requires a new EIN. Going the other direction, from multi-member to single-member, also changes the filing requirement.
How do you apply for a new EIN?
You apply on Form SS-4. US applicants with an SSN can use the IRS online tool for an instant EIN. Non-US residents without an SSN file Form SS-4 by fax to 855-215-1627, which takes 4-7 business days. ein.so handles the fax filing for $49 Standard or $97 Express.
Does a name change require a new EIN for a corporation?
No. A corporation that changes its name keeps its EIN. The corporation reports the new name on its next tax return or notifies the IRS in writing. A new EIN becomes necessary only when the corporation receives a new charter from the state or converts to a different entity type.
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