How to Verify a Tax ID Number

Yes, you can verify a Tax ID number through the IRS

The IRS offers a way to confirm that a Tax ID number is valid and matches a business or individual name. You cannot do this online through a public portal — instead, you request verification through the IRS directly, either by mail, phone, or through a tax professional. The process takes time and requires you to provide specific information about the entity you're checking.

The reason you might need verification varies. You could be a landlord checking a tenant's ID before renting, a business verifying a contractor before payment, or someone confirming your own number is correct in government records. Each situation may use a different verification method.

Key Takeaways

The IRS does not offer a public online lookup tool to verify Tax ID numbers, but you can request verification by phone, mail, or through a tax professional.
Individual Tax ID numbers (SSN or ITIN) and business Tax ID numbers (EIN) use different verification paths.
Verification by phone through the IRS Business and Specialty Tax Line takes about 15 minutes if you have the correct information ready.
If you need written proof of verification for a third party, you must request it in writing and allow 10 to 15 business days for a response.

Verifying an EIN (Employer Identification Number)

An EIN is a nine-digit number assigned to businesses, nonprofits, trusts, and other entities. To confirm an EIN is real and matches a business name, you can call the IRS Business and Specialty Tax Line at 1-800-829-4933. Have ready: the EIN you're checking, the legal business name, and the name of the person who applied for the EIN (usually the owner or authorized representative).

The IRS representative will confirm whether the EIN exists and whether the name on file matches what you're verifying. This call is free and usually takes 10 to 15 minutes. If you need written confirmation for a contract, lease, or other document, you cannot get it over the phone — you must submit a written request instead.

To request written verification of an EIN, send a letter to the IRS address for your state (found on IRS.gov under "Where to File"). Include the EIN, the business name, your name and phone number, and a statement of why you need the verification. The IRS will mail you a response in 10 to 15 business days.

Verifying an Individual Tax ID (SSN or ITIN)

If you need to confirm that a Social Security Number (SSN) or Individual Taxpayer Identification Number (ITIN) is valid, the process is more limited. The IRS does not verify SSNs or ITINs directly to the public — this is a privacy protection. You cannot call and ask whether a number belongs to a specific person.

If you are an employer, you can use the Social Security Number Verification Service (SSNVS) through the Social Security Administration. This service lets employers check whether the SSN and name they have on file match Social Security's records. You must register for an account and use the online system or batch upload. This is designed for payroll verification, not general public use.

If you are not an employer and need to confirm an SSN or ITIN for another reason, you have no direct IRS tool. You may need to ask the person directly, request documentation (like a tax return or ID card), or consult a tax professional about what proof is acceptable for your situation.

What Information You Need to Verify an EIN

Before you call or write the IRS, gather these details:

The nine-digit EIN you want to verify
The legal business name (exactly as it appears on the EIN application)
The name of the person who applied for the EIN (the responsible party or owner)
Your own name and phone number (so the IRS can contact you if needed)
A statement of why you need the verification (optional but helpful)

If you are missing any of this information, the IRS may not be able to verify the number. If the business name or responsible party name does not match exactly what's on file, the verification will fail — even if the EIN itself is real. This is common when a business has changed names or when you have an incomplete version of the legal name.

When Written Verification Takes Longer

If you need proof in writing — for a lease, contract, or government form — you cannot use a phone call. The IRS does not provide written confirmation over the phone, and there is no way to print or download a verification letter from an online account.

You must mail a written request to the IRS. The address depends on your state. On IRS.gov, search for "IRS addresses by state" to find the correct mailing address for your location. Mail your letter and allow 10 to 15 business days for a response. If you need the verification urgently, this delay is a real constraint — plan ahead.

Some businesses and landlords will accept a screenshot or recording of your phone call with the IRS as informal proof. Ask what documentation they will accept before you spend time on verification.

What Verification Does and Does Not Tell You

IRS verification confirms that an EIN exists and that the business name on file matches the number. It does not tell you whether the business is currently operating, whether it owes taxes, whether it is in good standing, or whether the person claiming to represent it is actually authorized to do so.

If you are a landlord or business owner and need to know more than just "this EIN is real," you may need additional steps. You could request a business license from your state, ask for references, or run a background check through a private service. Verification through the IRS is one piece of due diligence, not the whole picture.

Frequently Asked Questions

Can I look up an EIN online without calling the IRS?

No. The IRS does not offer a public online search tool for EINs. You must call 1-800-829-4933 or submit a written request by mail. Some states publish business registries that include EINs, so you could also check your state's Secretary of State website or business registration database.

What if the EIN I'm checking does not match the business name?

The IRS will tell you that the EIN and name do not match. This could mean the business changed its name after getting the EIN, the person gave you the wrong number, or the information is incorrect. Ask the business directly for clarification, or request an updated EIN if they have one.

How long does phone verification take?

A phone call to the IRS Business and Specialty Tax Line usually takes 10 to 15 minutes if you have all the information ready. Wait times vary by time of day and season. Call early in the morning or mid-week for shorter hold times.

Can I verify an EIN for someone else without their permission?

Yes. The IRS will verify an EIN to anyone who calls with the correct information. There is no privacy restriction on EINs — they are business identifiers, not personal information. However, if you need written verification, you may need to explain your relationship to the business or provide documentation of why you need it.

What if I need to verify my own EIN?

Call the IRS at 1-800-829-4933 with your EIN and business name. The IRS will confirm it is on file. If you have lost your EIN or cannot remember it, you can also request a new one or ask the IRS to look it up based on your business name and address.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.