An Employer Identification Number (EIN) is a unique nine-digit number issued by the IRS to businesses in the United States for tax identification purposes. It’s essential for filing tax returns, opening business bank accounts, and completing various other business activities.

As you embark on your entrepreneurial journey or look to formalize your existing business, you may encounter the term “Employer Identification Number” or EIN.

While it may seem like another piece of bureaucratic jargon, the EIN is an essential element for many businesses in the United States.

In this article, we’ll explore what an EIN is, why it’s important, how to get one, and how it’s used.

Definition of an Employer Identification Number

An Employer Identification Number (EIN) is a unique, nine-digit number issued by the Internal Revenue Service (IRS) to businesses operating in the United States. It serves as the business equivalent of a Social Security Number (SSN) for individuals.

The EIN is used by the IRS for tax identification purposes and is required for various business activities such as filing tax returns, applying for business permits, and opening business bank accounts.

Importance of an EIN

Tax Identification

The primary function of an EIN is to allow the IRS to identify businesses for tax purposes. It helps segregate business income, expenditures, and tax liabilities from an individual’s personal finances.

Legal Requirements

In some cases, having an EIN is a legal requirement. For instance, if your business has employees, you’ll need an EIN to report employment taxes. Corporations and partnerships are also generally required to obtain an EIN.

Business Transactions

An EIN is often necessary for various business activities, such as opening a business bank account or securing business loans. It can also make it easier to separate personal and business finances, thereby facilitating better financial management.

Business Credibility

Having an EIN can lend credibility to your business operations. It signifies that you have taken the formal steps to legitimize your business, which can be advantageous when dealing with other organizations or applying for business credit.

How to Obtain an EIN

Obtaining an EIN is generally a straightforward process:

  1. Online: The fastest way to get an EIN is through the IRS website, where you can fill out the required form and receive your EIN immediately upon completion.
  2. Mail or Fax: You can also submit Form SS-4 via mail or fax to the IRS. This process typically takes a few weeks.
  3. Phone: Certain international applicants can obtain an EIN by calling the IRS.

The service is free, and there are no associated costs.


An Employer Identification Number (EIN) is more than just a random sequence of digits; it’s a critical identifier that allows the government to track your business activities, particularly related to taxation.

Whether you’re a sole proprietor, run a partnership, or own a corporation, understanding the importance of an EIN and how to obtain one is a fundamental step in establishing and operating a successful business.

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Brian Wilson Writer and Editor
Brian Wilson is the content manager and founder of LLC Radar. Brian grew up in North Texas, just outside of Dallas, and has a bachelor's degree in business from Southern Methodist University. Since graduating from SMU, Brian has gained over 10 years of experience in business writing for several online publications. Brian resides in Plano, Texas and he can be reached by email: Phone: 972-776-4050
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