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Form SS-4, Application for Employer Identification Number
What is Form SS-4?
Form SS-4 is the Application for Employer Identification Number from the Internal Revenue Service (IRS).
It is used to apply for an employer identification number (EIN).
File it if the applicant entity does not already have an EIN but is required to show one on a return, statement, or other document.
How the IRS accepts Form SS-4
The completed IRS.gov download is suitable for faxing or mailing to the IRS; for mail, sign and date the application, and keep a copy for your records.
For domestic organizations formed in the U.S. or U.S. territories with their principal place of business there, responsible parties can apply through the IRS online EIN service with the responsible party's SSN or ITIN.
The IRS About Form SS-4 page links instructions and recent developments.
The blank on this page
The blank is marked “Rev. December 2025”.
You can fill in this blank in the PDFLiner editor.
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Fillable online Form SS-4