About Form SS-4, Application for Employer Identification Number (EIN)
https://www.irs.gov/forms-pubs/about-form-ss-4
WEBUse Form SS-4 to apply for an employer identification number (EIN). An EIN is a 9-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.
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