Application for a tax ID number is a formal request for a tax identification number from the Internal Revenue Service (IRS). There is a unique nine-digit number associated with every tax-paying business entity in the United States, known as a tax ID number. The number is also known as an employer identification number (EIN).
What the EIN Is Used For
EINs are used to identify taxpayers. EINs are often considered business social security numbers (SSNs). The IRS uses the EIN for the following purposes:
• Identification of businesses in the US and its territories
• Business identification to document taxes
• Identification of the companies where tax-paying employees work
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