Fill Online Form SS-4: Application for Employer Identification Number
Zendocs is not affiliated with the IRS.
Zendocs is not affiliated with the IRS.
Form SS-4 is the official IRS application form used to request an Employer Identification Number (EIN). The SS4 form 2026 version reflects the most current updates and requirements for applying for your EIN in tax year 2025-2026. This unique nine-digit number acts as a federal tax identification number for businesses, trusts, estates, and other entities.
You will need to complete the accurate SS4 document to ensure your application meets IRS standards, whether submitting online, by fax, or mail. The SS4 document outlines all the required details such as entity type, responsible party information, and reason for EIN request.
Not every taxpayer needs an EIN, but many do. You must file Form SS-4 if you:
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The guided editor turns your answers into a finished legal form
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