A tax identification number (TIN) is a unique nine-digit number issued by the Social Security Administration or the Internal Revenue Service to anyone who pays taxes (personal or business).

A 9-digit number obtained from the IRS by a business with paid employees ... It is used to identify the tax accounts of corporations, partnerships and other entities. You need an EIN if you ...

As you prepare to file your taxes in advance of the April 15 deadline, you may be wondering about certain terminology. For instance, the 1040 form that most people use to file their federal income ...

and "Do you operate your business as a corporation or a partnership?" the IRS says you need a Tax ID number. If you don't currently have a Tax ID Number and need to get one, follow these steps.