About Form SS-4, Application for Employer Identification Number (EIN)

Information about Form SS-4, Application for Employer Identification Number, including recent updates, related forms, and instructions on how to file. Form SS-4 is used by sole proprietors, corporations, partnerships, estates, trusts, and other entities to apply for an EIN.
General Information
Businesses

Form SS-4, Application for Employer Identification Number

Form SS-4 is used by sole proprietors, corporations, partnerships, estates, trusts, and other entities to apply for an employer identification number (EIN), a nine-digit number assigned for tax filing and reporting purposes.
Forms and Instructions

Instructions for Form SS-4, Application for Employer Identification Number (EIN)

Instructions for Form SS-4, Application for Employer Identification Number, which is used by sole proprietors, corporations, partnerships, estates, trusts, and other entities to apply for an employer identification number (EIN), a nine-digit number assigned for tax filing and reporting purposes.
Forms and Instructions

Get an employer identification number

Use this tool to get an EIN directly from the IRS in minutes for free. Answer questions, submit the application and, if approved, we’ll issue your EIN immediately online.
General Information
Small Businesses

Publication 1635, Understanding Your EIN

Publication 1635, Understanding Your EIN, provides general information on Employer Identification Numbers (EINs).
Forms and Instructions