This step usually takes a few seconds.
The IRS uses the EIN to identify the taxpayer. EINs must be used by business entities; corporations, partnerships, and limited liability companies. However, most sole proprietors don't need to obtain an EIN and can use their Social Security numbers instead.
EINs, unlike Social Security numbers, can change. If a company started out as a sole proprietorship with a couple of employees and decided to incorporate later on, they would have to obtain a new EIN. If you have a legitimate need to know someone else's EIN or lost yours, order this search.