A company EIN number, or Employer Identification Number, is a nine-digit tax ID assigned by the IRS to identify businesses for tax reporting and other official purposes. It functions similarly to a Social Security number but for companies.
The IRS issues EINs through its online system, by mail, or by fax. The format is XX-XXXXXXX, where X represents a digit. The first two digits indicate the processing location, and the third digit is a business entity identifier.
For example, an EIN like 12-3456789 would be processed in the first location, with "3" indicating it's issued to a corporation. The IRS maintains a database of all active EINs to prevent duplication.
EINs are categorized based on the type of business entity:
| Entity Type | EIN Example |
|---|---|
| Corporation | 12-3456789 |
| Partnership | 23-4567890 |
| Sole Proprietorship | 34-5678901 |
| Nonprofit Organization | 45-6789012 |
Each structure receives a distinct EIN to reflect its legal classification.
An EIN is required for several key business activities:
Even sole proprietors without employees may need an EIN if they plan to hire workers later. The IRS recommends obtaining an EIN early in the business formation process.
Many people confuse the EIN with other business identifiers:
One non-obvious fact: EINs don't expire, even if the business closes. The IRS keeps them on file indefinitely.
The fastest way to get an EIN is through the IRS website. The online application takes about 10 minutes, and the EIN is issued immediately upon completion. For those who prefer paper forms, Form SS-4 can be submitted by mail or fax, but processing takes longer.
I assisted a client in applying for an EIN recently. They needed it to open a business bank account and hire their first employee. We completed the online application in under 15 minutes, and they received their EIN instantly. The process was straightforward, but having their business formation documents ready sped things up.