Learn How to Get a Tax ID Number

Understanding What a Tax ID Number Is and Why You Might Need One

A Tax ID Number, officially called an Employer Identification Number (EIN), is a nine-digit code that the Internal Revenue Service (IRS) assigns to businesses and other entities. The format follows this pattern: XX-XXXXXXX. Think of it as a Social Security Number for your business. Just as individuals use Social Security Numbers for tax purposes, businesses use EINs to report income, file taxes, and conduct financial operations.

Free Guide to Paying Your Comenity Bank Credit Card by Phone →

The IRS assigns EINs to various types of entities, including sole proprietorships, partnerships, corporations, nonprofits, trusts, and estates. If you operate a business with employees, you almost certainly need an EIN because the government requires it for payroll purposes. However, even if you run a solo business with no employees, you may want to obtain an EIN to separate your personal and business finances.

According to IRS data, millions of EINs are issued each year. In 2022 alone, the IRS assigned over 2 million new EINs. This reflects the constant flow of new businesses being established across the country. Whether you're starting a small consulting practice, launching an online retail shop, or establishing a nonprofit organization, understanding the purpose and function of an EIN is the first step.

Having an EIN provides several practical advantages. It allows you to open a business bank account in your company's name rather than mixing personal and business funds. It protects your personal Social Security Number by reducing the need to share it with third parties. It also establishes your business as a separate legal entity in the eyes of the IRS and other institutions.

Practical Takeaway: An EIN is a nine-digit identifier that the IRS uses to track business entities for tax purposes. Understanding whether your situation requires an EIN—based on your business structure and whether you have employees—helps you determine your next steps.

Different Types of Entities and Their Tax ID Requirements

Not every business structure has the same tax ID requirements. The type of entity you operate determines whether you need an EIN and how you'll use it. Understanding your specific situation helps you navigate the process accurately.

Find Your Auto Owners Insurance Claim Phone Number →

Sole proprietorships are the most common business structure in the United States. According to the Small Business Administration, roughly 73% of small businesses are sole proprietorships. A sole proprietor is an individual who owns and operates a business without forming a separate legal entity. If you operate as a sole proprietor without employees, you can report all business income and expenses on your personal tax return using your Social Security Number. In this case, an EIN is optional but may still be beneficial for keeping finances organized. However, if you have employees—even just one part-time worker—you must obtain an EIN to report payroll taxes.

Partnerships occur when two or more people share ownership of a business. Whether the partnership is formal or informal, general or limited, most partnerships must obtain an EIN. This is true even if the partnership has no employees. The EIN serves to identify the partnership entity separately from the individual partners' personal finances and Social Security Numbers.

Corporations and Limited Liability Companies (LLCs) are separate legal entities distinct from their owners. Federal law requires all corporations to obtain an EIN, regardless of whether they have employees or generate income. The same requirement applies to LLCs that are taxed as corporations. LLCs taxed as sole proprietorships or partnerships have more flexibility—they must obtain an EIN only if they have employees or meet other specific criteria.

Nonprofits, including charitable organizations, religious groups, and educational institutions, must obtain an EIN. This applies whether or not they have employees. The nonprofit EIN is essential for tax-exempt status and for other regulatory purposes. Trusts and estates also typically require EINs, particularly if they generate income or have ongoing financial obligations.

Practical Takeaway: Your specific business structure—whether sole proprietorship, partnership, corporation, LLC, nonprofit, or trust—determines your EIN requirements. Review your situation against these categories to determine whether you need to proceed with obtaining one.

Step-by-Step Process for Obtaining Your Tax ID Number

The IRS offers multiple methods for obtaining an EIN. The most convenient method for most business owners is online through the IRS website. The online application is available 24 hours a day, seven days a week, and you receive your EIN immediately upon completion. To use the online system, you need to be a U.S. citizen or resident alien with a valid Social Security Number or Individual Taxpayer Identification Number (ITIN). You'll also need information about your business, including its legal name, physical address, mailing address, and the type of business structure.

Free Guide to Finding Your Credit Card PIN →

To begin the online process, visit the IRS website and locate the EIN application tool. You'll be asked to provide detailed information about your business. This includes the date you began or will begin operations, the number of employees you have or expect to have, and the primary business activity. The system will ask you to describe your business in your own words—you don't need technical jargon. For example, if you're starting a dog-walking service, you would describe it as "walking dogs for customers." The IRS uses this information to assign you the correct business classification code.

After you submit your online application and confirm your information, the system immediately assigns you an EIN. You can print a confirmation page that displays your new number right away. This confirmation is official and recognized by banks, vendors, and the IRS. The IRS will also mail you a formal EIN Assignment Notice (Form SS-4) within two weeks, though you don't need to wait for the paper version to begin using your number.

If you cannot use the online system, other methods are available. You can mail Form SS-4 to the IRS, though this method typically takes four to six weeks. You can also fax the form to the appropriate IRS fax number based on your location. In rare cases, you may call the IRS EIN telephone line, but this is generally recommended only if you face unusual circumstances. The phone line operates Monday through Friday, 7 a.m. to 10 p.m. Eastern Time, excluding federal holidays.

Regardless of which method you choose, you'll need to provide accurate, complete information. Incomplete or incorrect applications may result in delays or rejection. It's important to double-check all details before submitting, particularly your business name, address, and business structure type.

Practical Takeaway: The online method is typically the fastest and most convenient option, providing your EIN immediately. Have your business details ready before starting the application, and ensure all information is accurate to avoid delays.

Required Information and Documentation You'll Need

Before you begin your EIN application, gather the necessary information. Having everything prepared in advance makes the process smoother and reduces the chance of errors. The IRS requires certain core information regardless of which application method you use.

Learn About Where to Put Your Money →

First, you need your legal business name exactly as it appears in your business formation documents. If you're operating under a "Doing Business As" (DBA) name, provide both your legal entity name and your DBA. For example, if you legally formed an LLC called "Smith Properties LLC" but operate it under the name "Quick Home Solutions," you would provide both names. The IRS tracks the legal name as the primary identifier.

Next, you'll need your complete business address. This should be a physical location where your business operates or is located, not a post office box. The IRS uses this address to mail official correspondence. If your business is home-based, use your residential address. If you have a separate office or storefront, provide that address instead. You should also be prepared to provide a mailing address if it differs from your physical location.

Information about the person responsible for the business is essential. For sole proprietorships, this is the owner. For partnerships, it's typically a general partner. For corporations and LLCs, it's usually the person who will manage the business day-to-day or an authorized representative. You'll need this person's full name, Social Security Number or ITIN, and their title or role. The IRS uses this information to verify the legitimacy of the application and to have a primary contact for the business.

You must also specify your business structure. The IRS uses standardized categories: sole proprietorship, partnership, S corporation, C corporation, trust, LLC, nonprofit, or other entity type. Understanding which category applies to your situation is crucial. If you've already filed formation documents with your state (such