An EIN is one type of tax ID, but not the only one

An EIN (Employer Identification Number) is a tax ID number, but the term "tax ID number" is broader. The IRS issues several different tax identification numbers depending on what you are and what you do. An EIN is the nine-digit number the IRS assigns to businesses, partnerships, corporations, nonprofits, and certain trusts. Your Social Security Number (SSN) is also a tax ID number — the IRS uses it to identify you as an individual for tax purposes. If you are self-employed and do not have employees, you may use your SSN instead of an EIN, though you can obtain an EIN if you want one.

The confusion arises because people often use "tax ID" and "EIN" interchangeably, but they are not the same thing. Think of it this way: all EINs are tax ID numbers, but not all tax ID numbers are EINs. The IRS also issues ITINs (Individual Taxpayer Identification Numbers) to people who are not U.S. citizens or permanent residents but have U.S. tax obligations. Each serves a different purpose in the tax system.

Key Takeaways

  • An EIN is a nine-digit number issued by the IRS to businesses, partnerships, nonprofits, and certain trusts; it is one type of tax ID number, not the only one.
  • Your Social Security Number is also a tax ID number that the IRS uses to identify you for tax purposes.
  • Self-employed people without employees can use their SSN for taxes, but can obtain an EIN if they choose to.
  • The IRS also issues ITINs to non-citizens and non-permanent residents who have U.S. tax obligations.
  • Banks, vendors, and employers often ask for an EIN or tax ID to report income or open business accounts.

When you need an EIN instead of just your SSN

You are required to have an EIN if you operate as a corporation, partnership, or LLC with more than one owner. You must also have an EIN if you have employees — even one part-time employee means you need an EIN to report payroll taxes. Nonprofits and certain trusts are required to have EINs as well.

Even if you are not required to have an EIN, you may want one. Many sole proprietors and self-employed people obtain an EIN to keep their business finances separate from their personal finances. Banks often prefer to see an EIN when you open a business account. Some vendors and suppliers ask for an EIN rather than an SSN for their records. Using an EIN instead of your SSN also adds a layer of privacy — your personal Social Security Number stays off business documents.

How an EIN differs from other tax ID numbers

The main difference between an EIN and an SSN is who receives it and why. The SSN is issued to individuals by the Social Security Administration and is used for employment, Social Security benefits, and tax reporting. An EIN is issued by the IRS specifically for business tax reporting and is not tied to any individual's personal identity — it belongs to the business entity itself. If you sell your business or close it, the EIN goes away with it. Your SSN stays with you for life.

An ITIN works similarly to an SSN for tax purposes but is issued only to non-citizens and non-permanent residents. If you are a foreign national with U.S. income, you may need an ITIN to file taxes or open a bank account. The IRS issues ITINs; they are not tied to work authorization or immigration status.

All three — SSN, EIN, and ITIN — are nine-digit numbers, so they look similar on paper. The difference is in who issues them, who can receive them, and what they are used for in the tax system.

How to obtain an EIN if you need one

You can obtain an EIN for free directly from the IRS. The fastest way is to explore online at the IRS website using Form SS-4. The online process takes about 15 minutes and you receive your EIN when ready after you submit it. You can then use it right away.

If you prefer not to explore online, you can mail Form SS-4 to the IRS, fax it, or call the IRS Business and Specialty Tax Line. Mailed applications typically take four weeks. Faxed applications take about one week. Phone applications are processed when ready, though you will need to have your information ready and speak with an IRS representative.

You do not need to pay anyone to obtain an EIN. The IRS provides it at no cost. Be cautious of websites or services that charge a fee to "help" you get an EIN — you can do it yourself for free.

What to do with your EIN once you have it

Once you receive your EIN, keep it in a safe place. You will need it to file business tax returns, open a business bank account, hire employees, and explore for business licenses or permits. Vendors and suppliers may ask for it when you order goods or services for your business. The IRS will use it to track your business's tax filings and payments.

You should provide your EIN to your bank when you open a business account. You will also need it when you file your annual business tax return — the form depends on your business structure (sole proprietorship, partnership, S-corp, C-corp, LLC, or nonprofit). If you hire employees, you will use your EIN to report payroll taxes quarterly and annually.

Common situations where the distinction matters

If you are a freelancer or consultant working alone, you can report your income on your personal tax return using your SSN. You do not need an EIN unless you want one or unless you hire someone to work for you. Once you hire even one person, you must obtain an EIN.

If you are starting a business with a partner, you need an EIN. The partnership itself — not you or your partner individually — receives the EIN. The same applies if you form an LLC with another person or if you incorporate. The business entity gets the EIN; you use your SSN on your personal return.

If you are a nonprofit organization, you must have an EIN. You will use it to file Form 990 (or Form 990-N if you are very small) and to report donations and grants. Donors often ask for the nonprofit's EIN so they can verify the organization's tax-exempt status.

Frequently Asked Questions

Can I use my SSN instead of an EIN for my business?

If you are a sole proprietor with no employees, you can use your SSN on your business tax return. However, many sole proprietors obtain an EIN anyway to keep business and personal finances separate and to add privacy. You cannot use your SSN if you have employees, operate as a partnership or corporation, or run a nonprofit.

What if I lose my EIN or forget what it is?

You can look up your EIN by calling the IRS Business and Specialty Tax Line or by checking your business tax returns and bank records — your EIN appears on both. The IRS can also send you a copy of your EIN assignment letter if you request it. You do not need to explore for a new one.

Do I need an EIN to file taxes as a sole proprietor?

No. As a sole proprietor without employees, you can file taxes using your Social Security Number. You only need an EIN if you hire employees, want to keep business finances separate from personal finances, or prefer not to use your SSN on business documents.

Is an EIN the same as a business license number?

No. An EIN is issued by the IRS for federal tax purposes. A business license number is issued by your state or local government and is required to legally operate a business in your area. You may need both, and they are separate numbers.

Can someone use my EIN to commit fraud?

EIN fraud is possible but uncommon. Keep your EIN private and do not share it unnecessarily. If you suspect fraud, contact the IRS when ready. The IRS has procedures to help you if someone has misused your EIN.