Tax glossary

Employer Identification Number (EIN)

Employer Identification Number — what it means, how it works, and a real example, explained without the jargon.

What is Employer Identification Number (EIN)?

An EIN is a nine-digit federal tax ID for a business — essentially a Social Security number for your company.

How it works

You apply on IRS.gov and usually get one instantly. You need it to hire employees, open a business bank account, file business returns, and often to work with vendors who'd otherwise need your personal SSN.

A quick example

A freelancer forming an LLC gets an EIN so they can give clients an EIN on their W-9 instead of exposing their personal Social Security number.

What people get wrong

Getting an EIN is free and takes minutes on IRS.gov. Ignore third-party sites that charge a "filing fee" — they're just reselling a free government service.

UpTax.AI

Let AI prepare this — your CPA reviews.

  • AI drafts 1040s & business returns
  • A US CPA/EA verifies every number
  • Your first 5 returns are free
Book a demo Watch the 2-min demo →

SOC 2 in progress

Frequently asked questions

What does Employer Identification Number mean?

An EIN is a nine-digit federal tax ID for a business — essentially a Social Security number for your company.

How does Employer Identification Number work?

You apply on IRS.gov and usually get one instantly. You need it to hire employees, open a business bank account, file business returns, and often to work with vendors who'd otherwise need your personal SSN.

What's the most common mistake with employer identification number?

Getting an EIN is free and takes minutes on IRS.gov. Ignore third-party sites that charge a "filing fee" — they're just reselling a free government service.