Free Guide to Getting an EIN Number

What Is an EIN and Why Businesses Need One

An Employer Identification Number (EIN) is a nine-digit code that the Internal Revenue Service (IRS) assigns to businesses, nonprofits, trusts, and other entities. The format looks like this: XX-XXXXXXX. Think of it as a Social Security number for your business. The IRS uses this number to track your business for tax purposes, and many other organizations—banks, vendors, and government agencies—use it to identify your business in their systems.

The IRS started issuing EINs in 1962, and today millions of businesses hold active EINs. According to IRS data, approximately 33 million businesses in the United States use EINs. You might need an EIN if you operate as a sole proprietor with employees, run a partnership, own a corporation, manage an LLC, operate a nonprofit organization, or handle certain types of trusts and estates.

Sole proprietors without employees can often use their Social Security number instead of an EIN for tax filing. However, many sole proprietors obtain EINs anyway for business banking, credit purposes, or privacy reasons. If you have even one employee on your payroll—including yourself in certain business structures—you generally must have an EIN.

Banks often require an EIN before opening a business bank account. This separation between personal and business finances helps protect your personal assets and makes accounting simpler. Credit card processors, vendors, and contractors may also request your EIN as part of their standard business procedures. Some states require an EIN for business licensing or registration, while others do not.

EINs never expire. Once the IRS assigns you one, you keep it for the life of your business entity. If your business structure changes—for example, if a sole proprietorship becomes an LLC—you may need a new EIN, but the old number remains valid for historical records.

Practical Takeaway: Determine whether your business structure and circumstances require an EIN. Common reasons include having employees, opening a business bank account, hiring contractors, or establishing a corporation or LLC. If you are unsure, the IRS website provides specific guidance based on your business type.

How to Request an EIN From the IRS

The IRS offers multiple methods to request an EIN, and most are free. The fastest method is applying online through the IRS website. The online application system is called the EIN Assistant, and it typically issues your number immediately after you complete the form. You can then print your confirmation notice right away. This method works only for applicants with a U.S. address and a valid Social Security number or Individual Taxpayer Identification Number (ITIN).

To apply online, you visit the IRS website and complete Form SS-4 using the online interview format. The system asks you questions about your business—its legal name, physical address, type of business activity, and number of employees expected in the coming year. The questions are straightforward, and the process typically takes 10 to 15 minutes. You do not need to create a login or account. Once you finish and submit, the system either assigns your EIN immediately or tells you to call back within four business days.

If you prefer to apply by telephone, you can call the IRS Business and Specialty Tax Line at 1-800-829-4933. You will speak with an IRS representative who will ask you the same questions as the online form. The telephone representatives can answer follow-up questions about your specific situation. Processing by phone takes longer than online—you typically receive your EIN by mail within four weeks. The phone line operates Monday through Friday, 7 a.m. to 10 p.m. Eastern Time, excluding federal holidays.

You can also apply by mail using paper Form SS-4. You print the form, complete it by hand or typewriter, and mail it to the IRS address listed on the form. Processing by mail takes 4 to 6 weeks. You must include the correct IRS mailing address based on your state, which varies. Mail processing is slower than other methods but works if you do not have internet or phone access.

A third-party representative, such as an accountant or attorney, can request an EIN on your behalf using Form 2848 (Power of Attorney and Declaration of Representative). If you use a representative, you still need to provide your Social Security number or ITIN and information about your business. The representative handles the submission process, which may include mailing or online filing depending on their procedures.

Practical Takeaway: For the fastest results, use the online EIN Assistant on the IRS website. This method takes 10 to 15 minutes and generates your EIN immediately. If you do not have internet access or prefer phone support, the telephone option provides guidance from an IRS representative, though processing takes longer.

Information Required to Request an EIN

Before you begin the EIN request process, gather specific information about yourself and your business. Having these details ready ensures the application moves smoothly without delays. The IRS requires information about the business owner or principal officer, the business itself, and your business operations. Understanding what information you will need helps you prepare before starting your application.

For the business owner or responsible party, you will need a valid Social Security number or ITIN. If your business is a corporation, partnership, or LLC, the IRS typically requests the Social Security number of the owner, partner with the largest ownership stake, or managing member. You will also provide your full legal name exactly as it appears on your tax documents, your mailing address, and a telephone number where the IRS can reach you if needed.

Information about your business includes its legal name (the exact name registered with your state), the business address (where the business physically operates or is located), and the mailing address if different from the physical location. You will describe your business activity using general categories—for example, "retail clothing sales," "plumbing services," "web design," or "nonprofit educational organization." The IRS does not require you to specify every detail, just a general description so they understand the type of business.

You will indicate your business structure: sole proprietor, partnership, corporation (C or S), LLC, nonprofit organization, trust, estate, or other type. Your structure affects how you will file taxes and what documents you may need later. You will also state whether you have employees or plan to hire them, and if so, roughly how many. This information determines whether you must have an EIN, though having one as a sole proprietor without employees remains an option.

The IRS asks about the start date of your business—either when you began operations or when you plan to begin. If you are requesting an EIN for a new business before you officially open, you provide the expected opening date. You may also indicate whether you are buying an existing business, inheriting a business, or forming a new entity from the beginning. These details help the IRS properly classify and track your business.

Practical Takeaway: Create a simple document listing your Social Security number, exact legal business name, business address, type of business activity, business structure, and planned start date. Having this information written down before you start your application prevents errors and speeds up the process.

Understanding EIN Assignment and Confirmation

Once the IRS processes your request, they assign an EIN and provide you with official confirmation. How and when you receive your confirmation depends on which application method you used. Understanding the confirmation process helps you know what to expect and what to do next with your new EIN.

If you applied online through the EIN Assistant, your number appears on the screen immediately after you submit your application, provided all information is correct and the system can verify your identity. You can print your confirmation notice (Notice of EIN Assignment, Form SS-4) directly from the screen. This printed notice serves as official confirmation from the IRS. Many banks and vendors accept this printed confirmation as proof of your EIN. You should save this document in your business records and keep both a physical copy and a digital backup.

The confirmation notice includes your assigned EIN, your legal business name, your business address, the date the EIN was assigned, and your business structure. Review this information carefully to ensure everything matches what you provided. If you notice any errors on the confirmation, contact the IRS to request a correction. The IRS can issue a corrected notice if needed.

If you applied by telephone, the IRS representative provides your EIN verbally during the call. You should write it down immediately and ask the representative to spell it if needed to avoid transcription errors. The