Frequently asked questions
What is an EIN?
An Employer Identification Number (EIN), also called a Federal Tax Identification Number, is a 9-digit number assigned by the IRS to identify a US business entity for tax purposes. Every corporation, partnership, LLC, non-profit, trust and estate that files federal taxes needs one. Sole proprietors without employees may use their Social Security Number instead, but an EIN is recommended for privacy.
What does the prefix tell you?
The first two digits (the EIN prefix) historically identified which IRS campus processed the application. Since 2001 the IRS also issues EINs online, so the geographic meaning is less reliable — but the prefix still indicates the general era and method of assignment.
Is this the same as a tax ID?
EIN, Federal Tax ID, Federal Employer Identification Number (FEIN), and Tax Identification Number (TIN) are often used interchangeably for businesses. Technically TIN is the broader category that includes Social Security Numbers for individuals.
Can I verify an EIN here?
No — this tool checks structure only (9 digits, valid prefix). To officially verify an EIN is registered and active, you need to contact the IRS or use the IRS Business Master File. Nothing is uploaded from this tool.