Do You Need a New EIN After Buying a Business?

Quick answer: Often yes, but it depends on what you’re buying and how. The IRS says you need a new EIN, in general, when you change your entity’s ownership or structure, and that you don’t need one if you just change your business name or address. After that, the answer goes entity type by entity type, and the IRS page doesn’t speak to buyers directly. So don’t assume you can keep using the seller’s number, and don’t assume you can’t. Get the structure of your deal settled, then confirm the EIN answer with your accountant or the IRS.

This is one of those small questions that tells you whether a deal has been thought through. The answer is rarely dramatic, and the number is free from the IRS. But the question forces you to answer a bigger one: who, legally, is buying this business?

What does the IRS actually say?

Here’s the IRS list, by entity type. I’ve left out the parts that don’t touch a business purchase, like estates and trusts.

Entity	Get a new EIN if you	No new EIN if you
Sole proprietor	Incorporate, form a partnership or declare bankruptcy	Change your business name or locations, or own multiple businesses
Corporation	Get a new charter from the secretary of state, are a corporation’s subsidiary, change to a partnership or sole proprietorship, or merge and create a new corporation	Change name or location, declare bankruptcy, are a division of a corporation, are the surviving corporation after a merger, choose S corporation taxation, reorganize to change only your identity or location, or convert at the state level without changing your business structure
Partnership	Incorporate, take over a partnership to operate as a sole proprietor, or end a partnership and begin a new one	Change name or location, declare bankruptcy, or undergo a change in ownership that does not result in the termination of the partnership
LLC	Terminate an existing LLC and form a new corporation or partnership, or own a single-member LLC and have to file excise or employment taxes	Change name or location, report income tax as a branch or division of another entity with no employees or excise tax, convert a partnership to an LLC classified as a partnership, change your tax election to a corporation or S corporation, or use your sole proprietor EIN for your single-member LLC under the conditions the IRS lists

Read the general rule and the partnership line side by side and you can see why I won’t give you a one-word answer. The general statement says a change of ownership usually means a new EIN. The partnership list says a change in ownership that doesn’t terminate the partnership doesn’t. The details of your deal matter.

Which questions should you ask about your deal?

Before anyone answers the EIN question, you need these answered:

• Are you buying assets, or the company itself? If you’re buying assets, the seller’s company stays with the seller. If you’re buying the company’s ownership, the entity you now own already exists.
• What entity is being sold? The IRS list changes completely depending on whether it’s a sole proprietorship, corporation, partnership or LLC.
• Are you buying through a new company? If you form one, that company is a new entity with its own paperwork to get in order, and the right legal structure is worth deciding before you sign anything else.
• Will there be employees? The IRS says that generally you need an EIN to hire employees, operate a partnership or corporation, pay sales and excise taxes, or change business structures or ownership. If a team comes with the deal, your employment paperwork needs attention too.

The way the deal is structured also affects other filings, including IRS Form 8594 for an asset purchase. Your accountant should be in this conversation.

In what order should you do things?

The IRS gives one clear sequencing rule: if you are creating a corporation or LLC, form your entity through the secretary of state before you apply for an EIN. If you don’t, your EIN application may be delayed.

The IRS says you can get an EIN directly from it for free, and that if an online application is approved, the number is issued immediately. The person applying must be the responsible party in control of the entity or its authorized representative, and you can apply for only one EIN per responsible party per day.

That order matters in Illinois too. Step 3 of Form CBS-1, the bulk sale notice, asks for the purchaser’s Social Security number or federal employer identification number, as applicable. The notice has to be filed at least 10 business days before the sale. If a new company is the purchaser, you’ll want that company formed and its number in hand with time to spare. That’s one more thing for your timeline, along with what to check before you sign.

Can the business keep its name if the EIN changes?

Those are separate questions. The IRS says a name change alone doesn’t require a new EIN, and the number doesn’t tell you who owns the brand. If the name is part of the deal, handle that on its own. Read does the brand come with the business.

Why talk to the Bosses’ Lawyer about this?

Because the EIN question is really a structure question, and structure is where I like to start. I’m a Chicago business attorney licensed in Illinois. I’ll help you think through who’s buying what, then work with your accountant so the tax side and the legal side tell the same story.

See my page on buying a small business in Illinois, then book a discovery call or call 866-217-3432.