IRS Form SS-4, Application for Employer Identification Number (EIN), is a legal document filled out by various businesses that want to be assigned an employer identification number (EIN), also known as the tax identification number or federal employer identification number, for identifying and tax reporting. Without this number, it is impossible to track federal income tax payments and determine the amount of tax owed. It will be linked to your Internal Revenue Service records and bank accounts. An EIN is used by all types of businesses - trusts, estates, government agencies, partnerships, corporations, etc. - even if they do not have any employees.
This form was released by the IRS. The latest version of the form was issued in December 2019 with all previous editions obsolete. You can download a fillable Form SS-4 PDF through the link below.