Free Guide to Finding Your EIN Number

What is an EIN and Why You Might Need One

An EIN, or Employer Identification Number, is a nine-digit number assigned by the Internal Revenue Service (IRS) to identify a business for tax purposes. It works similarly to how a Social Security number identifies a person. The format is always XX-XXXXXXX, with the first two digits indicating the state where the business is located or where the IRS processing office is assigned.

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The IRS issues approximately 4 million new EINs annually to various types of business entities. You may need an EIN if you operate as a sole proprietorship with employees, run a partnership, manage a corporation, oversee a limited liability company (LLC), operate a nonprofit organization, or work as a trust or estate. Even if you have no employees, certain business structures require an EIN rather than using your personal Social Security number for tax identification.

Sole proprietors without employees sometimes can use their Social Security number instead of an EIN, though many choose to obtain an EIN anyway for privacy and organizational reasons. If you hire even one employee, you must have an EIN before that person's first day of work. Agricultural businesses, certain trusts, and many nonprofit organizations also require EINs regardless of whether they have employees.

Banks and vendors often request an EIN when you open a business bank account or apply for credit in your business's name. Having an EIN separates your personal finances from your business finances, which can be important for accounting, liability protection, and tax purposes. The number becomes your business's tax identifier on all federal tax returns, W-2 forms for employees, and 1099 forms for contractors.

Practical takeaway: Determine your business structure first—this determines whether you must obtain an EIN or may choose to. Document your business type and structure before beginning the search process.

How to Obtain an EIN: The Main Methods Available

The IRS provides multiple methods to obtain an EIN, and most of them cost nothing. The fastest method is online application through the IRS website, which provides immediate confirmation upon completion. This option is open to U.S. citizens and resident aliens only, and you can apply Monday through Friday, 7 a.m. to 10 p.m. Eastern Time.

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By telephone, you can reach the IRS Business and Specialty Tax Line at 1-800-829-4933. This line operates the same hours as online applications and works best if you have questions during the process or encounter technical difficulties. A representative will ask questions about your business, verify your information, and provide your EIN by phone. Have your documentation ready before calling so the process moves smoothly.

Paper applications using Form SS-4 represent the traditional method. You complete the form and mail it to the appropriate IRS address based on your state. The IRS processes paper applications within four weeks under normal circumstances. This method works if you prefer not to use computers or phones, though it takes longer than online or phone methods.

Tax professionals and authorized IRS agents can also submit EIN applications on your behalf. Many accountants, attorneys, and bookkeepers have permission to file electronically, which can be helpful if you need guidance with the application process itself. These professionals may charge a fee for their services, though the government application remains free.

Some states offer EIN applications through state-specific portals or business registration systems, though these typically route to the federal IRS system. The state sometimes processes business licensing simultaneously, which can save time if you need both.

Practical takeaway: Choose the method that matches your comfort level and timeline. Online is fastest (same day), phone is interactive, and mail is traditional. All methods are free and equally valid.

Step-by-Step: Applying Online for Your EIN

To apply online, visit the official IRS website at irs.gov and search for "Apply for an EIN Online." The IRS maintains a dedicated online application tool called the EIN Assistant. You'll need a computer or mobile device with internet access and about 15 minutes to complete the process.

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Before starting, gather required information. You'll need your Social Security number or individual taxpayer identification number (ITIN), your legal business name, a mailing address, information about your business structure and industry, and the month your business began operations. If your business is registered with your state, have that registration information available. If you're applying on behalf of someone else's business, you'll need their consent and their signature.

The online form presents questions in a logical sequence. First, you'll provide your responsible party information—the person who owns or controls the business. The IRS considers the responsible party to be someone with significant control or ownership, typically the owner. You'll then enter your business information including the legal name (exactly as it appears on your business license or registration), the trade or business name if different from the legal name, and your principal business address.

Next, you'll select your business structure from options including sole proprietor, partnership, corporation, S corporation, LLC, trust, or nonprofit organization. The form asks when your business started and what your primary business activity is—you may need to think about this beforehand since the form includes specific industry codes.

After you submit the completed form, the system typically provides your EIN immediately on the screen and offers to email it to you. Write down your EIN right away and save the confirmation email. The IRS will mail an official letter to your mailing address within a few business days that you should keep for your records.

Practical takeaway: Prepare your information before logging in to avoid interruptions. The immediate confirmation makes online application preferable if you need your EIN quickly for business account setup or hiring purposes.

Information to Prepare Before You Apply

Gathering documentation before you start makes the application process faster and more accurate. Missing or incorrect information can delay your EIN issuance or require follow-up. Start by clarifying your business structure: are you a sole proprietorship, partnership, LLC, corporation, nonprofit, or something else? Your structure appears on your business registration papers or formation documents.

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You'll need your legal business name exactly as it appears on your state registration, license, or formation documents. If your business operates under a different name (a "doing business as" name or DBA), know both the legal name and the trade name. The form asks for both, and confusion here is a common source of errors.

Your principal business address is where your business is located or where you manage its operations. This is not necessarily your home address—it should be where you actually run the business. If you work from home, your home address is acceptable. Have the complete address including street, city, state, and ZIP code.

Document what your business does. The IRS uses industry classification codes, and the online form has search tools to find the right code. If you're unsure whether you're "retail trade," "professional services," or another category, browse the examples provided. Being as specific as possible helps ensure proper classification.

Note the month your business began operations. This can be the month you opened your doors, the month you made your first sale, or the month you first became liable for business taxes—different situations have slightly different rules. If you're applying for a new business before it opens, you can enter a projected start date.

Have a phone number where the IRS can reach you if they have questions, and your email address if you want confirmation sent electronically. Providing accurate contact information prevents delays if clarification is needed.

Practical takeaway: Create a simple checklist with your business name, address, structure, industry, and start date. Verify this information matches your official business registration documents before applying.

Understanding Processing Times and What Happens Next

After you receive your EIN, the IRS processes and records your information in their system. If you applied online or by phone, you received your number immediately and can begin using it right away. Paper applications take longer—typically four weeks under normal processing times, though this may extend during peak periods or if the IRS identifies issues with your application.

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The IRS mails an official EIN confirmation letter (Form SS-4 confirmation) to your mailing address. This letter shows your EIN, your business name, and other information from your application. Keep this letter in your business records indefinitely. If you applied online or by phone and don't receive a physical letter within two weeks, you can contact the IRS at 1-800-829-4933 to request a copy