A physical letter must be mailed indicating the ... Internal Revenue Service. "Do You Need an EIN?" Internal Revenue Service. "Form SS-4 Application for Employer Identification Number." ...

For instance, the 1040 form that most people use to file their ... incorporation and tax purposes or both, “In the EIN Letter that the IRS provides you, there will details about what tax filings ...

PeopleImages.com / Getty Images Form W-9, Request for Taxpayer ... your Social Security number (SSN) or employer identification number (EIN). If the IRS has notified you that you are subject ...

If you are not sure whether or not you should submit a form W-9, consult a tax professional. If you are a sole proprietor, you can enter either your SSN or EIN. If your business is a corporation ...

(Tasos Katopodis/Getty Images / Getty Images) In the letter, Ernst noted the EIN online application tool was currently only available on weekdays during specific hours. The IRS lists the hours for ...