Last Updated: January 7, 2023 by the TRUiC Team

EIN Number Lookup: How to Find Business Tax ID Online

An Employer Identification Number (EIN), is a unique nine-digit number issued by the Internal Revenue Service (IRS) to identify your business. All business EINs are public information. We show you how to do an EIN Lookup for your own business or other businesses.

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What is an EIN Number?

An Employer Identification Number (EIN), also known as a Federal Employer Identification Number (FEIN) or Federal Tax Identification Number (FTIN), is like a Social Security number (SSN) for your business.

The unique nine-digit EIN number allows the Internal Revenue Service (IRS) to identify businesses for tax reporting.

Business owners will usually need an EIN when they:

Apply for small business loans and credit
Open a small business bank account
Hire employees (EIN required)
File Business Taxes

When Does Your Business Need an EIN Number?

If any of the following statements are true, you'll need to get an EIN:

Your business has employees
Your business is a partnership or corporation
Your business files excise taxes
Your business withholds taxes for nonwage income paid to a nonresident alien
You need one to open a business bank account.
You need a business credit card to effectively and quickly build business credit.

Visit Divvy to apply for their business credit card designed for new businesses and build your business credit quickly.

When Does a Sole Proprietorship Need an EIN Number?

A sole proprietor normally uses their own personal social security number for their business but even they must obtain an EIN to hire employees or files excise taxes. Learn more in our Does a Sole Proprietor Need an EIN guide.

Single-member LLCs should also generally obtain an EIN number and operate using their EIN number in order to maintain their corporate veil.

A sole proprietor must have an EIN to hire employees. Learn more in our Does a Sole Proprietor Need an EIN guide.

Starting a Business? Learn about EINs and more on our free state-by-state How to Start a Business guides.

Start a Business

How to Do an EIN Lookup Online

You can locate a lost or misplaced EIN by the following

Check to see if you have any notifications from the IRS , they will usually include your EIN number in any letters or notifications. Any previously filed tax return will also contain your EIN.
If you used your EIN to open a business bank account, you can contact your bank for your EIN
If you used your EIN with the a State Agency or local authority to obtain any business licence or permit you can also contact them.
You can call the IRS directly to retrieve your EIN Monday through Friday between the hours of 7 a.m. to 7 p.m., Eastern Standard Time. The phone number for the Business & Specialty Tax Line is 800-829-4933. Keep in mind that Mondays are the busiest days to call the IRS. An IRS representative will ask you some qualifying questions to confirm business ownership or to verify that you’re authorized to be provided with the EIN.

If you are trying to find the EIN of business other than yours there are a few options.

If the company is publicly traded, you can search The Securities and Exchange Commission EDGAR online Forms and Filings (SEC) database for the EIN (I.R.S. Employer Identification No.).
If you have a relationship with the company, eg they are a vendor etc you should simply ask the company for its EIN
If the business is a nonprofit you may locate it in the IRS tax exempt organization Search.

Paid Method of Finding an EIN For a Business

Try purchasing a business credit report from any of the major credit agencies.

Are You Forming an LLC? We will lead you through the simple steps for forming an LLC in our free guides—from naming your business to getting an EIN.

Form an LLC

Get a Free EIN

The quickest and simplest way to get a free EIN is to apply for one through the EIN Assistant on the IRS website.

You must form your business before getting an EIN. The IRS will ask for your business formation date and legal business name.

You can also apply for an EIN by fax or mail by completing Form SS-4. If you are submitting by fax, send your EIN application to fax number (855) 641-6935. If applying by mail, submit to Internal Revenue Service, Attn: EIN Operation, Cincinnati, OH 45999.

Frequently Asked Questions: EIN Number Lookup

Do I need an EIN if I’m self-employed?

You don’t need an EIN if you’re self-employed; you can simply use your Social Security number. Some people who are self-employed choose to apply for an EIN instead of using their Social Security number to reduce the risk of identity theft; it’s less likely for someone to break into your accounts when you keep business finances and personal finances separate.

I have a sole proprietorship with a DBA (doing business as or fictitious name). Do I Need an EIN?

Having a DBA doesn’t impact whether or not you are required to have an EIN for your sole proprietorship. The same rules apply to a sole proprietorship with a DBA as apply to a sole proprietorship without a DBA.

Per the IRS, “A sole proprietor without employees and who doesn’t file any excise or pension plan tax returns doesn’t need an EIN.” Once you hire employees or file excise or pension plan tax returns, you will immediately require an EIN.

Is there a difference between an EIN and a TIN?

No, there isn't a difference between an Employer Identification Number (EIN) and a Taxpayer Identification Number (TIN). Both refer to the nine-digit number issued by the IRS to identify your business.

Is there a difference between an EIN and a FEIN?

No, there is not a difference between an EIN and a Federal Employer Identification Number (FEIN). A FEIN can also be referred to as a Federal Tax Identification Number.

How to establish business credit through your EIN?

When learning how to open a business credit file, you’ll need an EIN number. For building business credit the EIN is used to:

What is business credit? In business, credit is essential for obtaining goods and services. Businesses need to be able to borrow money in order to purchase items or pay employees.

There are a number of ways that businesses get credit, including tradeline companies (credit companies), business credit cards, a business credit line, startup business credit cards with no credit, and loans from banks and other lending institutions.

Here are more business credit resources: