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

Use Form SS-4 to apply for an Employer Identification Number (EIN). An EIN is a nine-digit number (for example, 12-3456789) assigned to employers, sole proprietors, corporations, partnerships, estates, trusts, certain individuals, and other entities for tax filing and reporting purposes.


Current Products

Form SS-4

Instructions for Form SS-4 (HTML)


Recent Developments

Change to the Instructions for Form SS-4 (Rev. January 2011) -- 19-FEB-2013


Other Items You May Find Useful:

All Form SS-4 Revisions

Apply for an Employer Identification Number (EIN) Online

Publication 966, The Secure Way to Pay Your Federal Taxes for Business and Individual Taxpayers

Publication 1635, Understanding Your EIN

Formulario SS-4PR, Solicitud de Número de Identificación Patronal (EIN)

Other Items Related to Form SS-4

Other Current Products


Comment on Form SS-4

Send us an email or use the Comment on Tax Forms and Publications web submission form to provide us feedback on the content of the products we give you to help you comply with tax law.

Caution: If you have a tax-related question, please go to Help With Tax Questions or call our toll-free number at 1-800-829-1040 (Individuals) or 1-800-829-4933 (Business). We cannot respond to tax-related questions submitted from this page.

Although we cannot respond individually to each email, we do appreciate your feedback and will consider your comments as we revise our tax products.

Page Last Reviewed or Updated: 11-Mar-2013