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Which form is used to apply for an employer identification number?

  1. Form SS-8

  2. Form 8233

  3. Form SS-4

  4. Form 1042-T

The correct answer is: Form SS-4

Form SS-4 is the correct form used to apply for an employer identification number (EIN). An EIN is a unique nine-digit number assigned by the IRS to identify a business entity. Form SS-8 is actually used to request a determination of worker status for purposes of federal employment taxes and income tax withholding. Form 8233 is used by foreign nationals to claim a tax treaty exemption on income other than personal services income, and Form 1042-T is used to report tax withheld on certain income of foreign persons.