Where to look for a company's tax ID

A company's tax ID number—officially called an Employer Identification Number (EIN)—is public information, and you can find it through several free sources without contacting the company directly. The IRS maintains a searchable database, your state's tax authority publishes records, and the company itself usually lists it on tax forms or official documents.

The fastest route depends on what you already know about the company. If you have any official paperwork from them—a W-2, 1099, invoice, or annual report—the EIN is printed on it. If not, the IRS Business Search tool or your state's business registry will have it in seconds.

Key Takeaways

  • The IRS Business Search tool at irs.gov is free and returns results when ready for most companies.
  • Your state's Secretary of State office maintains a business registry where you can search by company name and find the EIN.
  • If the company is publicly traded, the EIN appears in SEC filings, which you can access through the SEC's EDGAR database at no cost.
  • W-2s, 1099s, invoices, and annual reports all display the EIN, so check any paperwork you have from the company first.
  • If a company refuses to provide its EIN when you ask directly, that is a red flag—legitimate businesses share this information openly.

Using the IRS Business Search tool

The IRS offers a free online tool called the Business Search at irs.gov/tax-professionals/tax-exempt-organization-search. Enter the company name and state, and the database returns the EIN along with the business address and tax classification. This works for most companies, nonprofits, and tax-exempt organizations.

The search is straightforward: type the exact company name or a close variation, select the state where it operates, and click search. Results appear when ready. If you get no results, try searching with a shorter version of the name—for example, search "Apple" instead of "Apple Inc." or "Microsoft" instead of "Microsoft Corporation."

One limitation: the IRS database includes active and recently inactive businesses, but very small sole proprietorships may not appear. If the company is brand new, the EIN may not be indexed yet, which usually takes a few weeks after the company registers with the IRS.

Checking your state's business registry

Every state maintains a business registry, usually run by the Secretary of State's office. These registries are free and searchable online. Search by company name, and the results show the EIN, business address, and registration status. State registries are often faster than the IRS database for small or newly registered businesses.

To find your state's registry, search "[your state] Secretary of State business search" or go directly to the Secretary of State website for your state. Most states have a link labeled "Business Search," "Entity Search," or "Corporation Search" on the homepage. Enter the company name and the registry returns the filing information, including the EIN.

State registries are particularly useful if the company is registered as an LLC, S-corp, or C-corp in your state, because these entities must file formation documents that include the EIN. Sole proprietorships and partnerships may not appear unless they registered a business name.

Finding the EIN on company documents

If you have received any official paperwork from the company, the EIN is almost certainly printed on it. Check W-2 forms, 1099 forms, invoices, contracts, and annual reports. The EIN appears in the top right corner of W-2s and 1099s, and on invoices it is usually listed near the company name and address.

For publicly traded companies, the EIN appears in SEC filings. You can search the SEC's EDGAR database at sec.gov/cgi-bin/browse-edgar by company name. Open the company's 10-K (annual report) or 10-Q (quarterly report), and the EIN is listed on the cover page.

Annual reports and financial statements filed with your state also display the EIN. If the company is a nonprofit, search your state's charity registry or the IRS Tax Exempt Organization Search, both of which list the EIN prominently.

What to do if you cannot find the EIN

If the company does not appear in the IRS database or your state registry, it may be a very new business, a sole proprietorship that has not registered a business name, or a business operating under a different legal name than the one you searched. Try searching under alternate names—for example, if the company does business as "ABC Consulting," search for the owner's legal business name instead.

You can also contact the company directly and ask for its EIN. Legitimate businesses provide this information without hesitation, because the EIN is public. If a company refuses or seems evasive about sharing its EIN, that is a warning sign that something is not legitimate.

If you need the EIN for tax purposes and cannot locate it, contact the IRS directly at 1-800-829-1040 or visit your local IRS office. Have the company's legal name, address, and phone number ready. The IRS can confirm whether the company has an EIN and provide it to you.

Understanding what the EIN tells you

An EIN is a nine-digit number formatted as XX-XXXXXXX. It is assigned by the IRS to any business that has employees or operates as a corporation or partnership. The EIN itself does not reveal much—it is straightforward an identifier—but finding it confirms the company is registered with the IRS and is a real, operating business.

The presence of an EIN does not may provide the company is legitimate or financially sound. It only means the IRS has issued an identification number. To verify a company's reputation or financial health, you would need to check business reviews, credit reports, court records, or the Better Business Bureau separately.

Frequently Asked Questions

Is a company's EIN the same as its Social Security number?

No. An EIN is for businesses; a Social Security number is for individuals. A sole proprietor may use their Social Security number as their business tax ID, but once they hire employees or incorporate, they must obtain an EIN. The two numbers are never the same.

Can I find an EIN if the company is out of business?

Yes. The IRS database includes inactive businesses for several years after they close. Search the IRS Business Search tool or your state's registry—both retain records of dissolved companies. If the company closed very recently, the record may still be updating.

Why does a company need an EIN?

The IRS requires an EIN for any business that has employees, operates as a corporation or partnership, or files certain tax forms. Sole proprietors without employees can use their Social Security number instead, but most businesses obtain an EIN to keep personal and business finances separate.

What if the company name on the document does not match the search results?

Companies often operate under a legal name different from their trade name. For example, a company might be legally registered as "Smith Holdings LLC" but do business as "Smith Consulting." Search both names, or search the owner's name if you know it. State registries usually list both the legal name and trade name.

Can I use someone else's EIN?

No. Using another company's EIN is tax fraud. Each business must use only its own EIN on tax forms and official documents. If you need an EIN for your own business, you must explore for one through the IRS.