When Does a Business Need a New EIN?

The General Rule

The IRS ties the need for a new EIN to a change in your business's legal structure or ownership, not to changes in how you operate day to day. A new name, a new address, a new officer, or even new owners don't, by themselves, require a new EIN in most cases. What does require one is becoming a legally different kind of entity, one the IRS no longer recognizes as the same taxpayer it originally assigned the number to. The specific triggers differ by how your business currently operates, so the IRS breaks its guidance out by entity type.

If You're a Sole Proprietor

Per the IRS, you need a new EIN if you:

• Incorporate.
• Form a partnership.
• Declare bankruptcy.

You do not need a new EIN if you simply change your business name or location, or if you own more than one business as a sole proprietor; the IRS generally expects one EIN per sole proprietor in that case, not one per business name.

If You Operate a Corporation

Per the IRS, a corporation needs a new EIN if it:

• Gets a new charter from the secretary of state.
• Becomes a subsidiary of another corporation.
• Changes to a partnership or a sole proprietorship.
• Merges to create a new corporation.

A corporation does not need a new EIN if it changes its name or location, declares bankruptcy, becomes a division of another corporation, is the surviving corporation after a merger, elects to be taxed as an S corporation, or reorganizes to change only its identity or location. A corporation that converts at the state level, for example reincorporating under a new state's law, without changing its underlying business structure also keeps its existing EIN.

If You Operate a Partnership

Per the IRS, a partnership needs a new EIN if it:

• Incorporates.
• Is taken over by one partner who continues the business as a sole proprietor.
• Ends and a new partnership begins.

A partnership does not need a new EIN if it changes its name or location, declares bankruptcy, or goes through a change in ownership that doesn't actually terminate the partnership, such as a partner leaving or a new partner joining while the partnership itself continues.

If You Operate an LLC

The IRS's LLC guidance is narrower than the other entity types. A new EIN is required if the LLC:

• Terminates its existing LLC status and forms a new corporation or partnership.
• Is a single-member LLC that has to file excise or employment tax returns and hasn't already obtained its own EIN.

A new EIN is not required if the LLC changes its name or location, reports income tax as a branch or division of another entity and has no employees or excise tax liability of its own, converts a partnership into an LLC classified as a partnership for tax purposes, or changes its federal tax election to be taxed as a corporation or S corporation. A single-member LLC that has been using its owner's EIN and doesn't elect corporate or S corporation treatment and has no employees or excise tax liability can also continue using that EIN rather than obtaining a new one.

A Change That Doesn't Require a New EIN Still Needs to Be Reported

Many of the changes on the "no new EIN" side of this list still have to be reported to the IRS through a different process. A change in your responsible party, business address, or business location is reported on Form 8822-B, not by applying for a new EIN, and the IRS requires reporting a responsible-party change within 60 days. A legal name change follows its own entity-specific process instead. See our guide on updating business information with the IRS for exactly how each of these updates is filed.

Why Getting This Right Matters

Applying for a new EIN when you don't actually need one creates two separate tax identities for what the IRS still considers, in many cases, a continuation of the same entity, which can complicate matching past filings, deposits, and returns to the correct account. Failing to get a new EIN when a real structural change occurred, such as incorporating a sole proprietorship, can mean filing returns under the wrong taxpayer identity for your new structure. If your situation doesn't clearly match one of the triggers above, for example a single-member LLC becoming a multi-member LLC, confirm the correct treatment with a tax professional or directly with the IRS rather than guessing.

This Is Separate From Updating the IRS on a Change You Already Made

It's easy to conflate "reporting a change" with "needing a new EIN." Most changes to your business, including your address, your responsible party, and in some cases your name, are handled by notifying the IRS through the correct form or letter, not by applying for a new number. Only the specific structural triggers above call for an actual new EIN.

Ownership Changes Deserve a Closer Look

Whether a change in who owns a partnership or an LLC rises to the level of ending one entity and starting another, rather than a continuation with new owners, can be a fact-specific question, particularly for a partnership. See our guide on changing business ownership records for how an ownership change is handled with the state and the IRS.

Keep Both EINs on File if You Ever Do Get a New One

If a structural change does require a new EIN, keep records under your old EIN for the period before the change and start fresh records under the new one going forward; don't try to merge activity from both into a single set of books, since the IRS tracks them as separate taxpayer identities.

This Is Not Tax Advice

Whether your specific situation, especially an LLC ownership or membership change, requires a new EIN depends on your facts and how your entity is currently classified for tax purposes. Talk to a tax professional before assuming either answer, particularly if your business is converting between a single-member and multi-member LLC or between tax classifications.