You should call your employer or payroll company and get their EIN in order to properly file your taxes. Get it from last year's W-2, if you're still working for the same employer.
An Employer Identification Number (EIN) is also known as a Federal Tax Identification Number, and is used to identify a business entity. It is individual to your employer.
Click here for "How Do I FInd My Employers EIN"?
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