Employer Identification Number (EIN) Definition: A 9-digit number obtained by a business with paid employees from the IRS. If you're a sole proprietorship, your EIN is your social security number.

If using mail or fax, ensure you send it to the correct IRS address or fax number. Once your application is processed, you will receive your EIN. Keep this number in a safe place, as you will need ...

The EIN is a nine-digit number the IRS issues. It is used to identify the tax accounts of corporations, partnerships and other entities. You need an EIN if you have employees, operate your ...