An Employer Identification Number (EIN) is a 9-digit number issued by the IRS for the purposes of identifying a particular business' tax account. The EIN format is XX-XXXXXXX..EINs are used by employers, sole proprietors, corporations, partnerships, non-profits, trusts, estates of decedents, government agencies, certain individuals, and other business entities. These entities must provide their EIN on every form/communication that is sent to the Internal Revenue Service (IRS) or the [...]