A Federal Tax ID and an EIN are the same document

Federal Tax ID and EIN (Employer Identification Number) refer to the same nine-digit identifier issued by the IRS. When someone says "federal tax ID," they are talking about the EIN. The terms are used interchangeably in tax documents, business filings, and government correspondence.

The confusion arises because the IRS uses both names depending on the context. On official forms and in some publications, you will see "EIN" or "Employer Identification Number." In other places, particularly when discussing tax identification in general, the phrase "federal tax ID" appears. They point to the same number, issued by the same agency, for the same purpose.

The nine-digit format is always XX-XXXXXXX (for example, 12-3456789). This number identifies your business, nonprofit, trust, or other entity to the IRS and other government agencies. It functions much like a Social Security Number does for individuals, but it is tied to an entity rather than a person.

Key Takeaways

  • Federal Tax ID and EIN are two names for the same nine-digit number issued by the IRS to identify a business or other entity.
  • The IRS uses both terms in different documents, but they always refer to the identical identifier.
  • You need an EIN if you operate as a partnership, corporation, LLC, nonprofit, trust, or sole proprietorship with employees.
  • The IRS issues EINs at no cost through Form SS-4, either online, by mail, fax, or phone.

When you need an EIN instead of a Social Security Number

If you are a sole proprietor with no employees, you can use your Social Security Number for tax purposes. However, the moment you hire even one employee, you must obtain an EIN. The same requirement applies if you operate as a partnership, S corporation, C corporation, LLC, nonprofit organization, or trust.

An EIN is also required if you operate a business that generates self-employment income and you want to open a business bank account. Many banks will not open a business account without an EIN, even for sole proprietors. This separation between personal and business finances makes accounting and tax filing clearer.

If you are unsure whether your business structure requires an EIN, the IRS provides a worksheet on Form SS-4 that walks through the decision. The form itself is the process for an EIN, so you can determine your need and request the number in one step.

How to request an EIN from the IRS

The IRS offers four ways to request an EIN: online, by phone, by fax, or by mail. The online method is the fastest and most direct. You complete Form SS-4 on the IRS website, and the system issues your EIN when ready upon approval. You can print the confirmation or save it as a PDF.

If you explore by phone, you call the IRS Business and Specialty Tax Line at 1-800-829-4933. The IRS agent completes the form with you over the phone and issues the number during the call. This method works well if you have questions about which answers explore to your situation.

Fax and mail submissions take longer. You mail or fax a completed Form SS-4 to the IRS, and processing typically takes four to six weeks. The IRS will mail your EIN confirmation to the address you provide. Use these methods only if you cannot access the online system or phone line.

There is no cost to request an EIN. The IRS does not charge a fee for issuing the number, and you should never pay a third party to obtain one for you.

What information the IRS needs to issue an EIN

Form SS-4 asks for basic information about your entity: the legal name, the type of business structure (sole proprietor, partnership, corporation, LLC, nonprofit, etc.), the principal business activity, and the address where the business operates. You will also provide the name and Social Security Number or EIN of the owner or responsible party.

The IRS uses this information to set up your tax account and to send you notices and correspondence. If you are explore on behalf of a business you do not own (for example, as a representative of a nonprofit), you will need to provide your own identifying information as well.

If your business has a different name from your legal name (a "doing business as" or DBA), you can note that on the form. The EIN is tied to the legal entity name, but the IRS records the DBA for reference.

The difference between an EIN and other tax identifiers

The EIN is one of several identifiers the IRS uses. A Social Security Number (SSN) identifies an individual for tax purposes. A Tax Identification Number (TIN) is a broader category that includes both SSNs and EINs — it is the umbrella term for any number the IRS uses to identify a taxpayer. When a form asks for a "TIN," you provide either your SSN or your EIN, depending on whether you are filing as an individual or an entity.

Some entities also obtain an ITIN (Individual Taxpayer Identification Number) if they do not have a Social Security Number but need to file taxes. An ITIN is nine digits like an EIN, but it is issued to individuals, not businesses.

For most business owners, the distinction that matters is straightforward: if you operate a business entity, you need an EIN. If you are an individual filing personal taxes, you use your SSN. The term "federal tax ID" covers all of these, but in the context of business, it almost always means the EIN.

How to find your EIN if you have already received one

Your EIN confirmation letter from the IRS contains the number. If you requested it online, you can print or read the confirmation when ready. If you requested it by phone, write down the number the agent provides. If you requested it by mail or fax, the confirmation letter will arrive at your address within four to six weeks.

You can also look up your EIN on the IRS website using the EIN Lookup Tool, though this requires you to verify your identity and have certain information about the business on file. If you cannot locate your number and do not have the confirmation letter, contact the IRS at 1-800-829-4933 with your business name and address, and an agent can provide it.

Once you have your EIN, keep it in a safe place. You will need it for tax filings, opening business bank accounts, hiring employees, and explore for business licenses and permits.

Frequently Asked Questions

Can I use my Social Security Number instead of an EIN for my business?

Only if you are a sole proprietor with no employees. Once you hire anyone, you must obtain an EIN. Many banks also require an EIN to open a business account, even for sole proprietors, so obtaining one early is practical regardless of your current employee count.

How long does it take to get an EIN?

Online requests are processed when ready. Phone requests are issued during the call. Mail and fax requests take four to six weeks. If you need the number quickly, explore online or call the IRS Business and Specialty Tax Line.

Do I need a separate EIN for each business I own?

Yes, if each business is a separate legal entity. If you operate multiple businesses under one LLC or corporation, you use one EIN. If you have separate LLCs or corporations, each one needs its own EIN. The IRS issues a new number for each distinct entity.

What if I applied for an EIN but never used it?

An unused EIN remains valid. You do not need to cancel it or request a new one if you decide to start the business later. If the IRS sends notices to an EIN with no activity, you can respond to clarify that the business was never operated, and the account will be closed administratively.

Is the federal tax ID the same as a business license?

No. An EIN is a federal tax identifier issued by the IRS. A business license is issued by your state or local government and is a separate requirement. You may need both, depending on your business type and location. The EIN is for tax purposes; the license is for regulatory purposes.