There is no public IRS tool that lets you type in an EIN and confirm it belongs to a particular business, so verifying an EIN number online means using the right workaround for the situation: a W-9 from the business itself, the IRS Tax Exempt Organization Search for nonprofits, SEC EDGAR for public companies, the IRS TIN Matching program if you file 1099s, and state business registries as supporting confirmation. Which method fits depends on who you’re checking and why.
The reason no universal lookup exists is 26 U.S. Code Section 6103, which treats tax returns and return information as confidential. The IRS will confirm an EIN only to the business it belongs to or someone that business has formally authorized.1Office of the Law Revision Counsel. 26 U.S. Code 6103 – Confidentiality and Disclosure of Returns and Return Information2Internal Revenue Service. Employer Identification Number Everything below either draws on other public records or applies to a narrow category the IRS has deliberately made searchable.
If the EIN Is Your Own
This is the one situation where the IRS itself will confirm the number. If you’re the business owner or an authorized officer:
- Pull your original CP 575 confirmation notice. That’s the letter the IRS sent when it assigned the EIN. Applied online? You also received a downloadable confirmation at the end of the session.
- Sign in to your IRS business tax account online and request a business tax transcript, which shows filings tied to your EIN. Form 4506-T is the mail-in version.2Internal Revenue Service. Employer Identification Number
- Call the IRS Business and Specialty Tax Line at 800-829-4933 (TTY 800-829-4059), Monday through Friday, 7 a.m. to 7 p.m. local time. After identity verification, the agent will confirm the number on the call and send Letter 147C as written proof.2Internal Revenue Service. Employer Identification Number
Letter 147C is the IRS’s official EIN verification letter. Banks, licensing agencies, and state regulators accept it as proof the EIN is valid and tied to your business. When the CP 575 is long gone and you need to open a business account, requesting 147C by phone is usually the fastest route.
Verifying Another Business: Request a W-9
For most people checking another company’s EIN, the practical answer is to ask for a completed W-9. That’s the standard IRS form businesses and independent contractors use to hand over their taxpayer identification number to anyone required to file an information return about payments to them.
The W-9 asks for the legal name, entity type, and EIN, and the signer certifies under penalty of perjury that the number is correct. That certification is what gives the form its weight. Providing a false TIN on a W-9 exposes the signer to a $500 civil penalty for a false statement that avoids backup withholding, with criminal fines and imprisonment possible for willful falsification.3Internal Revenue Service. Form W-9 (Rev. March 2024)
A W-9 doesn’t independently prove the number is valid. You’re relying on the business’s representation. What it does is create a paper trail with real legal consequences if the information turns out to be false, which is why W-9s are the standard practice for vendor onboarding and contractor payments.
TIN Matching if You File 1099s
If you file information returns, the IRS offers a more direct check. The Taxpayer Identification Number Matching program lets authorized payers validate a name-and-TIN combination against IRS records before filing.4Internal Revenue Service. Taxpayer Identification Number (TIN) Matching
Access is limited. You must be a payer listed in the IRS Payer Account File database, or that payer’s authorized agent, and you have to register through the IRS e-Services portal. The tool tells you whether the TIN and name you submit match what the IRS has on file. It won’t return an EIN for a company you’re researching cold. It’s a confirmation tool, not a search engine.
Running TIN Matching before filing season catches mismatches early, which matters because an incorrect TIN on a 1099 triggers backup withholding obligations and IRS penalty notices.
Nonprofits: Tax Exempt Organization Search
Tax-exempt organizations are the big exception to IRS privacy. The IRS publishes their information, including EINs, through the Tax Exempt Organization Search tool, which you can query by name or EIN.5Internal Revenue Service. Tax Exempt Organization Search6Internal Revenue Service. Tax Exempt Organization Search
The tool draws from the Exempt Organizations Business Master File and covers more than 501(c)(3) charities. You can check whether a charity is eligible to receive tax-deductible contributions through the Pub 78 data, look at filed Form 990 returns, see whether an exemption was automatically revoked, and pull determination letters.
Timing catch: a newly formed nonprofit won’t appear until the IRS processes its exemption application. Form 1023-EZ typically clears in a few weeks; a full Form 1023 can take six months or more before a determination is issued.7Internal Revenue Service. Where’s My Application for Tax-Exempt Status If a recently formed nonprofit doesn’t turn up, its application may still be pending.
Public Companies: SEC EDGAR
Publicly traded companies disclose their EINs in SEC filings. The number appears on the cover page of the annual 10-K report, right after the state of incorporation.8SEC.gov. Form 10-K Search for any public company’s filings through the EDGAR database by name or ticker.9SEC.gov. Search Filings
EDGAR also has a full-text search across more than 20 years of filings. Pull the most recent 10-K or 10-Q and the EIN is on the cover. It isn’t an IRS verification in the formal sense, but the figures in these filings are attested to by company officers under SEC rules.
State Business Registries
Most states require businesses to register with a Secretary of State or similar agency, and most of those agencies maintain searchable online databases. You can typically confirm that an entity is legally registered, find its formation date, check its standing, and identify its registered agent.
Whether the registry actually shows the federal EIN varies by state. Some include it in the public record; others treat it as confidential. Even without the EIN itself, confirming the legal name, registration status, and state of formation is useful when you’re trying to match an EIN you’ve received from another source. Searching is generally free, though certified copies of formation documents carry a small state-set fee.
Watch Out for Paid “EIN Lookup” Sites
Search for “EIN lookup” and you’ll surface paid third-party sites charging up to $300 for services the IRS provides for free. The FTC issued warnings to operators of these sites in 2025, noting that some use IRS-style logos, color schemes, and domain names containing “IRS” to create a false impression of government affiliation.10Federal Trade Commission. FTC Warns Operators of Websites That Charge for an Employer Identification Number
Red flags:
- Fees to apply for an EIN. The IRS online EIN application is free.
- Government-style seals, official-looking layouts, or prominent use of “IRS” or “EIN Assistant” (the IRS’s own tool name) on a non-government site.
- No clear disclosure that the site is not affiliated with any government agency.
The FTC noted that impersonation-rule violations can carry civil penalties of up to $53,088 per violation plus mandatory consumer refunds.10Federal Trade Commission. FTC Warns Operators of Websites That Charge for an Employer Identification Number To apply for an EIN, go directly to irs.gov. To verify one, use the methods above rather than a paid lookup service.
Where These Methods Stop Working
No single online method gives you a definitive, IRS-confirmed answer for every business. The two tools that pull from IRS data, TEOS and TIN Matching, cover only specific categories or require you to be an authorized payer. EDGAR only helps with public companies. State registries may or may not include the federal EIN. Sole proprietorships and partnerships without employees often have no public registration that would surface an EIN at all.
Commercial databases aggregate EIN data from public filings and other sources. Some are reasonably accurate, none are official IRS verification, and the data can be stale. For a significant transaction, confirm anything you find in an aggregator against at least one of the primary sources above rather than taking the result at face value.