A 9-digit number the IRS assigns to businesses for tax identification — like an SSN for companies.
An EIN (Employer Identification Number) is assigned to business entities by the IRS for tax reporting purposes. Format: XX-XXXXXXX. Every business that has employees must have an EIN — it appears on paystubs, W-2s, and 1099s. You can apply for a free EIN instantly at IRS.gov. It's also needed to open a business bank account, apply for business credit, and file business tax returns.