EIN Number Lookup: Free Ways to Find or Verify an EIN

An EIN number lookup usually means one of two things: you lost your own Employer Identification Number, or you need to find or verify another company's EIN before you pay, file, or sign. The fastest path depends on which problem you have, because the IRS does not publish one central public EIN database.

Key Takeaways

• There is no IRS public search page where you can type a business name and retrieve every company's EIN.
• If you lost your own EIN, check your CP 575 notice, prior tax returns, payroll records, bank records, or call the IRS Business & Specialty Tax Line.
• The IRS does not reissue the original CP 575 confirmation letter, but an authorized person can request a 147C EIN verification letter.
• You can do an EIN lookup free for public companies through SEC EDGAR, nonprofits through IRS Tax Exempt Organization Search, and benefit-plan sponsors through DOL Form 5500 resources.
• Verifying an EIN is different from finding one. IRS TIN Matching checks whether a name and TIN combination matches IRS records for eligible filers.
• Most Secretary of State searches confirm entity status, not federal EINs. State registration numbers and state tax IDs are different numbers.

What an EIN Lookup Can and Cannot Find

An Employer Identification Number is a nine-digit federal tax identification number assigned by the IRS to a business entity, trust, estate, nonprofit, or certain other organization. You will usually see it formatted as XX-XXXXXXX. Businesses use EINs to file federal tax returns, run payroll, open business bank accounts, apply for licenses, and give tax information to customers or vendors on forms such as Form W-9.

An EIN is a type of taxpayer identification number, or TIN. The terms often overlap in business conversations, but they are not always identical. A federal tax ID number for a business usually means an EIN. A Social Security number identifies an individual. An ITIN identifies certain individuals who are not eligible for an SSN. A state tax ID is a separate state-issued number used for state tax accounts.

The most important lookup rule is simple: the IRS keeps tax return information confidential and does not offer a general EIN search by company name. An EIN becomes public only when it appears somewhere else, such as a securities filing, nonprofit filing, benefit-plan filing, invoice, W-9, W-2, 1099, contract, court record, or other document. That is why some EINs are easy to find and others are not findable online at all.

How to Find My EIN Number Fast

If you are asking how to find my EIN number, do not apply for a new EIN just because you misplaced the old one. An EIN does not expire, and it stays attached to the entity. Start with records you already have, because most owners can recover the number without a paid search.

1. Find the CP 575 confirmation notice. The IRS issued this notice when your EIN was assigned. If you applied online, you likely downloaded or printed it at the end of the application. If you applied by mail or fax, the IRS sent it that way.
2. Check prior federal tax returns. Your EIN appears on business returns such as Form 1120, Form 1120-S, Form 1065, employment tax returns, and other federal filings made under the business name.
3. Review W-2s and 1099s your business issued. Your EIN appears in the employer or payer tax identification field.
4. Check business bank documents. Banks collect EINs when opening business accounts or processing business loans. Your bank may confirm it after verifying your authority.
5. Ask your payroll provider, accountant, or licensing agency. These parties often recorded the EIN during onboarding or applications.
6. Call the IRS Business & Specialty Tax Line. The IRS lists 800-829-4933 for business tax questions. The line is generally open Monday through Friday, 7 a.m. to 7 p.m. local time.

The IRS will not give your EIN to just anyone who calls. Be ready to prove that you are authorized to receive it, such as an owner, corporate officer, partner, trustee, executor, or someone with valid authorization for the entity.

IRS EIN Lookup, CP 575, and 147C Letters

An IRS EIN lookup for your own business usually happens by phone, not through a public online tool. The IRS may locate the number after confirming your identity and authority. Before calling, gather the business's legal name, trade name if any, mailing address on IRS records, entity type, and your role with the business. Mismatched addresses or old legal names can slow the call.

The original EIN confirmation notice is called CP 575. It is generated when the IRS assigns the EIN. The IRS does not reissue that same notice later. If a bank, lender, payment processor, or government agency asks for official written proof of your EIN and you no longer have the CP 575, ask the IRS for a 147C letter instead.

A 147C letter is an EIN verification letter. It confirms the entity name and EIN in IRS records and is commonly accepted when a third party needs proof. An authorized person can request it by calling the IRS Business & Specialty Tax Line. The IRS may send it by mail or fax, depending on the circumstances and current procedures. If fax is available, it can be much faster than waiting for mail.

If your business name or address changed after the EIN was assigned, fix the record issue before relying on the letter for a closing, loan, or account opening. Many EIN problems are not number problems. They are name, address, or entity mismatch problems.

EIN Lookup Free for Another Company

If you need an EIN lookup free for another company, start with the company's category. Public companies, nonprofits, and employers with benefit plans leave different records. A private company with no public filings may not have a public EIN trail.

Public companies: Search SEC EDGAR. Public company filings often list the EIN on the cover page as the IRS Employer Identification Number. Annual reports and quarterly reports are good places to check. This is one of the most reliable free sources for companies that file with the SEC.

Nonprofits, charities, and many private schools: Use the IRS Tax Exempt Organization Search. Tax-exempt organizations are a special category because the IRS makes certain nonprofit information publicly searchable. Form 990 filings also show the organization's EIN. If you are doing a school EIN number lookup, first determine whether the school is a tax-exempt private school, a university, or a public school district.

Companies with retirement or benefit plans: Check Department of Labor Form 5500 resources. Employers that sponsor certain retirement or welfare benefit plans file Form 5500, and plan sponsor information includes the EIN. This path is often useful for ordinary private companies that are not public and are not nonprofits.

Private companies: Ask for a completed Form W-9. That is often the fastest and cleanest method. Vendors commonly provide W-9s so customers can prepare 1099s. If the company has sent you an invoice, contract, W-2, 1099, or onboarding packet, review those documents before paying for a report.

Verify EIN Number Before Paying or Filing 1099

To verify EIN number information, first separate lookup from verification. A lookup tries to discover a number you do not have. Verification tests whether the number you received matches the legal name, and sometimes other facts, for the entity you are dealing with. Those are different jobs.

If a vendor gives you an EIN, do not treat the number alone as proof of identity. A bad actor may use a real EIN with a different name, address, or payment instruction. Match the EIN against the legal entity name. If possible, compare the address, state registration, invoice, contract party, bank instructions, and W-9. A name/EIN mismatch matters most when you are filing information returns or paying a large invoice.

The strongest free verification tool for many payers is the IRS TIN Matching program through IRS e-Services. Registered users who meet the program requirements can submit name and taxpayer identification number combinations to check whether they match IRS records. It is designed to help payers avoid mismatches before filing information returns such as 1099s. TIN Matching does not find a missing EIN by company name. It confirms whether a name/TIN pair matches.

For one-off due diligence, use official filings first. SEC filings, IRS exempt organization records, and DOL plan filings can confirm the name and EIN together. For repeated onboarding, commercial tools can help at scale, but you should understand what they are doing. Many paid EIN database services aggregate public filings, business credit data, and other records. They can save time, but they are not the same as a complete official IRS public database.

Tax ID Number Lookup and State Search Confusion

A tax id number lookup gets confusing because several different identifiers appear in business records. The number you need for a federal W-9 or 1099 is usually the EIN. A state registration number, state employer account number, sales tax number, or state tax ID is not the same thing.

Secretary of State business searches are still useful. They can confirm the legal name, entity type, formation state, registration status, registered agent, filing history, and sometimes officers or managers. Use them to make sure the company exists and that the legal name on the invoice matches a real entity. Do not assume the search result will reveal the EIN. Most Secretary of State portals do not list federal EINs because the EIN is assigned by the IRS and is not needed for many state public records.

This distinction matters when you search by company name. A business may operate under a trade name or DBA while its EIN belongs to the legal entity behind that name. If your EIN search fails, look up the trade name, invoice name, domain name, and contracting party to identify the true legal name. Then search SEC EDGAR, IRS exempt organization records, DOL Form 5500 sources, or request a W-9 under that legal name.

For state-specific searches, such as an EIN number lookup Maryland query, start with the same federal logic. Maryland records may help confirm the entity, but the federal EIN may still need to come from a W-9, federal filing, nonprofit record, SEC filing, or benefit-plan filing.

When an EIN Search Dead-Ends

Some EIN searches end without an answer, even when you use every free source correctly. That does not always mean the company is hiding something. It may mean the company has not created a public record that includes its EIN.

• The business may not have an EIN. Some sole proprietors and single-member LLCs without employees may use the owner's SSN for federal tax purposes, although many still obtain an EIN.
• The company may be too new. A recently formed private LLC may not have filed tax-exempt records, SEC reports, or benefit-plan documents.
• The entity may have changed names. Public records often use the legal name at the time of filing, not the brand name you see online.
• The business may be dissolved. EINs are not reused, but an old company's number may appear only in archived paperwork.
• You may be searching the wrong entity. Large groups often use subsidiaries, disregarded entities, payroll companies, or management companies with different tax records.

When this happens, ask for a W-9 and match it to the contract, invoice, and payment instructions. If the business refuses to provide basic tax documentation before payment, treat that refusal as a due diligence signal rather than a search problem.

When a lookup dead-ends and real money depends on the answer, before a payment, 1099 filing, or deal closing, the next step may be legal. A business attorney can compel documentation, verify the entity through state and federal records, and paper the relationship so the wrong EIN does not become your problem. You can post your legal need on UpCounsel's marketplace and hear from vetted business attorneys, typically within a day.

EIN Privacy and Business Identity Theft Precautions

Are EIN numbers public? The practical answer is that EINs are semi-public. They are not secret like Social Security numbers, but they are not all published in one official public database. A legitimate customer, bank, payroll provider, or government agency may need your EIN. You should not refuse every request. You should control how you share it.

The risk is business identity theft. Someone who has your EIN, legal name, address, officer information, and other records may try to open credit, redirect payments, file fraudulent returns, or impersonate your company with vendors. The EIN alone usually is not the whole problem. The problem is the EIN combined with other business information and forged documents.

Use practical safeguards. Keep CP 575 and 147C letters in secure company files. Avoid sending EIN documents through unsecured shared drives or casual email chains when bank information is also attached. Provide the EIN on a W-9 when there is a legitimate tax or business reason. Do not publish it unnecessarily on pages or documents that do not need it.

Monitor for warning signs. Watch for IRS notices about returns you did not file, unknown business credit inquiries, bills from unfamiliar creditors, or vendors asking about transactions you never approved. If you believe someone is misusing your business identity, the IRS provides Form 14039-B, Business Identity Theft Affidavit. You should also notify your bank, payment processors, and relevant business credit bureaus so they can help limit further misuse.

Frequently Asked Questions

Can I look up my EIN number online?

You cannot use a general IRS online tool to look up your own EIN by business name. Your fastest online sources are documents you already have, such as a saved CP 575 notice, filed tax return, payroll record, banking document, or accounting portal. If those fail, an authorized person can call the IRS Business & Specialty Tax Line.

Is a company's EIN number public?

A company's EIN can be public, but there is no complete public IRS database for all EINs. EINs become publicly findable when they appear in SEC filings, nonprofit records, DOL benefit-plan filings, or documents the company gives to others. Small private companies often have no public record showing the EIN.

Can I look up someone else's EIN?

You can look up someone else's EIN only when it appears in an accessible filing or document. Check SEC EDGAR for public companies, IRS Tax Exempt Organization Search for nonprofits, and DOL Form 5500 records for benefit-plan sponsors. For most private vendors, asking for a W-9 is usually the direct method.

Can I verify a company's EIN?

You can verify a company's EIN by matching the EIN to the legal name in an authoritative source or through IRS TIN Matching if you are eligible to use it. Verification should focus on the name/EIN combination, not the number alone. For payments, also compare the address, contract party, and payment instructions.

Is an EIN the same as a tax ID number?

An EIN is one type of tax ID number, but not every tax ID is an EIN. Businesses often use "federal tax ID" and "EIN" to mean the same thing. State tax IDs, sales tax account numbers, and Secretary of State registration numbers are separate identifiers issued for different purposes.

Does an EIN expire or change?

An EIN does not expire and is not reused for another entity. You generally keep the same EIN through address or name changes, but certain ownership or structure changes can require a new EIN. If you misplaced the number, recover it through records or the IRS rather than applying again.