Are FIN and EIN the Same Federal Tax ID?

Yes. A FIN and an EIN are the same number. The IRS calls it an Employer Identification Number, but banks, state agencies, and vendors often ask for a “Federal Identification Number,” “federal tax ID,” or “FEIN” (Federal Employer Identification Number). Every one of those labels points to the same nine-digit number, formatted as XX-XXXXXXX, that the IRS assigns to identify your business for federal tax purposes.¹

Why the Same Number Goes by So Many Names

The IRS uses one official label: Employer Identification Number. Everyone else uses whatever shorthand fits their form. A bank account application might ask for your “federal tax ID.” A vendor contract might reference your “FIN.” A state licensing form might request your “FEIN.” These are all the same nine digits.¹

Part of the confusion is the word “Employer.” It sounds like the number is only for businesses with payroll, which leads people running a partnership, trust, or nonprofit to assume they need a different “federal” number. They don’t. The EIN covers all of those entity types, with or without employees.²

So if a form asks for a Federal Identification Number in a business context, write in your EIN. If a form asks for a Federal Employer Identification Number, same answer. Federal tax ID, same answer. There is no separate number to track down.

The One Place the Words Don’t Match Up

There is one terminology trap worth knowing. Some people use “EIN” loosely to mean a state tax identification number, and some forms ask for a “state EIN” or “state tax ID.” Those are not your federal EIN. State tax IDs are separate numbers issued by state revenue agencies for state-level tax obligations, and they’re assigned independently of whatever the IRS gave you.

The quick test: if the form or the agency asking is federal, or if it just says “federal” without specifying, your EIN is the answer. If the agency is a state revenue department and the form specifically says state, you need a number from that state, not the one from the IRS.

What This Number Actually Is

An EIN works like a Social Security Number for a business entity. The IRS uses it to track tax filings, employment tax deposits, and other reporting tied to your organization.³ Outside the IRS, you’ll use it to open a business bank account, apply for business credit, and set up payroll.²

It’s a permanent identifier for the entity it was issued to. The IRS can’t cancel an EIN once assigned, though they can deactivate the account if the business closes.⁴ And it isn’t interchangeable with your personal taxpayer numbers. The IRS cautions against using your EIN in place of your Social Security Number for personal purposes, and vice versa; mixing them up creates filing problems that can take months to untangle.³

How To Tell Which Number a Form Wants

The EIN is one of several taxpayer identification numbers the IRS issues, and the labels on forms don’t always make the distinction clear. Here’s what each is:¹

EIN (Employer Identification Number): Nine digits, formatted XX-XXXXXXX. Identifies a business, trust, estate, nonprofit, or other entity. Also called FIN, FEIN, or federal tax ID on non-IRS paperwork.
SSN (Social Security Number): Identifies an individual U.S. citizen or authorized resident for personal tax filing.
ITIN (Individual Taxpayer Identification Number): A nine-digit number beginning with “9,” issued to individuals with a U.S. tax filing requirement who aren’t eligible for an SSN, such as certain non-resident aliens and their dependents.
PTIN (Preparer Taxpayer Identification Number): Assigned to paid tax return preparers.

None of these are interchangeable. An ITIN can’t substitute for an EIN when opening a business bank account, and an EIN can’t go on your personal Form 1040. But when a form asks for a “federal identification number,” “FIN,” “federal tax ID,” or “FEIN” in a business context, the answer is always your EIN.

If You Don’t Have the Number Handy

If you know you have an EIN but can’t locate it, check the original assignment notice the IRS sent, ask the bank where your business account is held, pull a past business tax return, or contact a state or local agency where you’ve used the number on a license application. If none of that works, call the IRS Business and Specialty Tax Line at 800-829-4933, Monday through Friday, 7:00 a.m. to 7:00 p.m. local time. After verifying your identity, they’ll give you the number over the phone.²

If you’ve never had one and need to apply, the IRS issues EINs for free through its online EIN Assistant and through Form SS-4. Any website charging a fee to “get” you an EIN is not the IRS; the only legitimate free application is at irs.gov.⁵

1
Internal Revenue Service. Taxpayer Identification Numbers
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Internal Revenue Service. Employer Identification Number
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Internal Revenue Service. Understanding Your EIN
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Internal Revenue Service. If You No Longer Need Your EIN
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Internal Revenue Service. Get an Employer Identification Number