An Employer Identification Number (EIN) is the 9-digit federal tax ID assigned by the IRS to a business entity. Also called a Federal Tax Identification Number (FEIN), it is required for opening business bank accounts, hiring employees, filing federal tax returns, applying for business credit and loans, obtaining business licenses, and most other institutional business operations. It is the business equivalent of a Social Security Number and one of the first administrative steps after incorporation.
How to obtain an EIN: file IRS Form SS-4, either online (the fastest method; available at IRS.gov, takes about 15 minutes if all info is ready, EIN issued immediately for US-based responsible parties), by fax (1 to 2 business days), by mail ...