What is itin tax number?

Question

ITINMay 25, 2026

What is itin tax number?

An ITIN is a U.S. tax processing number for individuals who need a U.S. taxpayer identification number but do not have and are not eligible for a Social Security number (SSN). It is issued by the IRS to certain non-resident aliens, resident aliens, and others who cannot obtain an SSN.

— Anonymous

1 Answer

Gokce Tandogdu ITIN Specialist, itin.net May 25, 2026 · Accepted Answer · 2026-05-25

An ITIN, or Individual Taxpayer Identification Number, is a tax processing number issued by the Internal Revenue Service (IRS) to individuals who are required to have a U.S. taxpayer identification number but do not have, and are not eligible to obtain, a Social Security number (SSN). The primary purpose of the ITIN is to facilitate U.S. tax compliance for individuals who are not U.S. citizens or permanent residents but have U.S. tax obligations.

This number is distinct from an Employer Identification Number (EIN), which is used for businesses. Understanding what is an ITIN tax number is crucial for many foreign nationals and non-residents who engage in financial activities or have income in the United States. The IRS issues ITINs regardless of immigration status. This means that undocumented immigrants, resident aliens, non-resident aliens, and even U.S. citizens who cannot obtain an SSN may apply for an ITIN.

Who Needs an ITIN?

An ITIN is required for individuals who need to file U.S. federal tax returns or are claimed as dependents on a U.S. federal tax return, and who do not have an SSN. This includes a variety of situations:

Non-resident aliens who need to file a U.S. tax return (e.g., those earning income from U.S. sources, such as rental income, royalties, or wages from U.S. employment).
Resident aliens (as defined by U.S. tax law, typically based on physical presence) who are not eligible for an SSN and need to file a U.S. tax return.
Dependents or qualifying children of U.S. taxpayers who are themselves not eligible for an SSN.
Dependents or qualifying children of U.S. taxpayers who are foreign nationals and need to file a U.S. tax return to claim certain tax benefits or refunds.
Spouses and dependents of U.S. citizens or resident aliens who are not eligible for an SSN.
Individuals who are subject to U.S. tax withholding and reporting requirements but are not eligible for an SSN. This can include individuals receiving income from U.S. partnerships, S corporations, or estates and trusts.
Individuals seeking to claim tax treaty benefits on U.S. source income. Many tax treaties allow for reduced or exempt withholding rates, but claiming these benefits often requires filing a U.S. tax return with an ITIN.
Individuals who need to open a U.S. bank account and are not eligible for an SSN. While not all banks require an ITIN for this purpose, many do, especially for non-resident aliens.
Individuals forming or operating a U.S. business, such as a U.S. LLC, who themselves need to file U.S. tax returns or are subject to specific reporting requirements like Form 5472 for foreign-owned disregarded entities. While an EIN is for the business, the individual owner might need an ITIN if they don't have an SSN.

It is important to note that an ITIN does not provide eligibility for work authorization in the United States, nor does it qualify the holder for Social Security benefits. It is solely a tax processing number.

What Information is on an ITIN?

An ITIN consists of nine digits, formatted like an SSN: XXX-XX-XXXX. The first digit is always a 9, the fourth and fifth digits are always 72 or 75, and the remaining digits are randomly assigned by the IRS. For example, a valid ITIN might look like 972-XX-XXXX or 975-XX-XXXX.

The IRS assigns ITINs through its Taxpayer Assistance Centers (TACs) and by mail. The application process involves submitting a completed Form W-7, Application for IRS Individual Taxpayer Identification Number, along with original or certified copies of identification documents and a U.S. federal tax return (or a return that will be filed). The ITIN itself is not a tax return; it is a number that allows individuals to file tax returns.

How Do You Apply for an ITIN?

Applying for an ITIN involves several key steps. The most common way to apply is by submitting Form W-7 to the IRS. You must include original or certified copies of your identification documents and a federal tax return. You can submit your application in one of three ways:

By Mail: Send your completed Form W-7, supporting identification documents, and your U.S. federal tax return to the IRS address specified in the Form W-7 instructions. The IRS will process your application and return your original documents by mail, typically within 7 to 11 weeks, though processing times can vary. This is the most common method for those applying from outside the U.S.
In Person at an IRS Taxpayer Assistance Center (TAC): Some IRS TACs offer ITIN application services. You can schedule an appointment at an IRS TAC to apply in person. You will need to bring your original identification documents, your completed Form W-7, and your tax return. The IRS staff will verify your documents and forward your application for processing. This can be a faster way to get your documents back, as they are usually returned the same day.
Through a Certified Acceptance Agent (CAA): This is often the most convenient method, especially for those who cannot travel to the U.S. or are uncomfortable sending original documents by mail. A CAA is an individual or entity (like itin.net) that has been authorized by the IRS to help taxpayers apply for ITINs. CAAs can authenticate your identification documents, meaning you do not have to send originals to the IRS. They submit the application on your behalf. This can significantly speed up the process and reduce the risk of losing your original documents. If you are considering a U.S. LLC or need an EIN for your U.S. business operations, a CAA can often assist with those processes as well.

Documents Required for ITIN Application:

To apply for an ITIN, you must provide documentation that proves your identity and foreign status. You need to submit either original identification documents or certified copies from the issuing agency. The IRS has specific requirements for which documents are acceptable. Generally, you must provide one primary identification document and one secondary identification document, or one document that satisfies both primary and secondary requirements. The most commonly accepted primary documents are:

Passport
National Identity Card
U.S. Driver's License
Foreign Driver's License

Secondary identification documents include a birth certificate, foreign vaccination records, bank statements, or state-issued identification cards. A passport is usually the preferred document as it serves as both proof of identity and foreign status.

The Tax Return Requirement:

Crucially, you generally must be filing a U.S. federal tax return to obtain an ITIN. There are a few exceptions, such as when applying for an ITIN for a dependent child or for specific treaty benefits, but the vast majority of applicants need to submit a tax return with their Form W-7 application. This tax return could be a Form 1040-NR for non-resident aliens, or a Form 1040 for resident aliens. If you are unsure about your filing obligations, it is best to consult with a tax professional.

ITIN Processing Time and Costs

The IRS does not charge a fee to apply for an ITIN. However, if you use a Certified Acceptance Agent (CAA) or an Acceptance Agent Program (AAP) agent, they may charge a fee for their services. These fees are set by the agent and can vary. The itin.net service, for example, charges a fee for its assistance in processing ITIN applications, which can streamline the process and ensure accuracy.

Processing times for ITIN applications can vary significantly. The IRS typically states that it can take 7 to 11 weeks from the date the application is received to receive your ITIN. This timeframe can be longer during peak tax seasons (January to April) or if there are any issues with your application. Expedited processing is sometimes available for urgent situations, such as needing an ITIN for a tax return with a filing deadline approaching, but this is not guaranteed and often requires demonstrating a specific need.

If you are applying via mail, remember to factor in the time it takes for your documents to be returned. Using a CAA can sometimes result in faster processing because the agent handles the initial verification and submission, and you typically get your original documents back sooner.

What Happens After You Get Your ITIN?

Once you receive your ITIN from the IRS, it is valid for tax filing purposes indefinitely unless it expires or is revoked. The IRS has a policy of retiring or deactivating ITINs that have not been used on a federal tax return for three consecutive tax years. If your ITIN has been deactivated, you will need to reapply using Form W-7 if you need to file a U.S. tax return.

Renewal of ITINs:

Certain ITINs are subject to renewal. The IRS started a renewal program in 2013. ITINs that meet specific criteria are required to be renewed. The IRS typically notifies taxpayers by mail if their ITIN needs to be renewed. The criteria for renewal can change, but generally, ITINs with the middle digits 70, 71, 72, or 81 are subject to renewal. If your ITIN falls into one of these categories and you intend to file a U.S. tax return, you must renew it. The renewal process is similar to the initial application, involving Form W-7 and updated identification documents, but generally does not require a new tax return unless it's time to file one anyway.

Subsequent Tax Filings:

Your ITIN will be used on all future U.S. federal tax returns you file. It is essential to use the same ITIN for all your tax-related activities. If you are operating a U.S. business, such as a U.S. LLC, and you need to file Form 5472 to report transactions with a foreign-owned entity, your ITIN will be used on that form if you do not have an EIN for yourself as an individual owner.

If you are engaged in U.S. business activities, you may also need an EIN for your business. For instance, if you are forming a U.S. LLC, the business entity itself will likely need an EIN to open a U.S. bank account or to conduct certain business transactions. Applying for an EIN is a separate process from applying for an ITIN, typically done by filing Form SS-4.

Opening Bank Accounts:

Many foreign nationals use their ITIN to open a U.S. bank account. While not a guarantee, having an ITIN can significantly improve your chances of opening an account, especially with banks that cater to international clients. This is often a necessary step for managing finances related to U.S. business activities or investments. Some digital banking platforms like Mercury, Relay, or Brex might have specific requirements, but an ITIN is often a key document for non-residents.

Common Mistakes When Applying for an ITIN

Several common errors can lead to delays or rejections of ITIN applications. Being aware of these pitfalls can help ensure a smoother process:

Incomplete or Incorrect Form W-7: Ensure all fields on Form W-7 are accurately completed. Missing information or errors in personal details can cause delays.
Missing or Unacceptable Identification Documents: Failing to provide the required original or certified identification documents is a frequent issue. Ensure you understand the IRS's guidelines on acceptable documents and that they are valid and current.
Not Submitting a Required Tax Return: As mentioned, most ITIN applications must be accompanied by a U.S. federal tax return. If you are applying for an ITIN and are not required to file a return, ensure you meet one of the specific exceptions outlined by the IRS.
Sending Photocopies Instead of Originals or Certified Copies: The IRS requires original documents or certified copies from the issuing agency. Photocopies are generally not accepted.
Incorrectly Applying for an ITIN When Eligible for an SSN: If you are eligible for an SSN, you must apply for an SSN first. An ITIN is only for those who cannot obtain an SSN. The IRS may reject an ITIN application if they determine the applicant is eligible for an SSN.
Errors in Tax Return: Any errors or omissions on the accompanying tax return can lead to the rejection of both the tax return and the ITIN application. It is advisable to have your tax return prepared by a qualified tax professional.
Not Using the Correct Application Method: Ensure you are following the correct procedure for submitting your Form W-7, whether by mail, in person at a TAC, or through a CAA.

When to Seek Professional Help

While the ITIN application process is designed to be accessible, seeking professional assistance can be highly beneficial, especially for individuals unfamiliar with U.S. tax laws or procedures. Certified Acceptance Agents (CAAs) like those at itin.net can guide you through the entire process, from understanding eligibility to correctly completing Form W-7 and ensuring you have the proper documentation. Using a CAA can save you time and prevent common mistakes, and it allows you to avoid mailing your original identification documents.

Furthermore, if your tax situation is complex, involves significant U.S. source income, or if you need to claim tax treaty benefits, consulting with a qualified tax advisor or CPA is recommended. They can help you prepare the necessary tax returns accurately and advise on potential tax implications. For those looking to establish a business presence in the U.S., such as forming a U.S. LLC or obtaining an EIN, professionals can offer comprehensive support. Remember, an ITIN is a tax processing number, and its application is intrinsically linked to your U.S. tax obligations. If you are unsure about your tax filing requirements or what is an ITIN tax number in relation to your specific circumstances, professional guidance is invaluable. You can find more information about ITIN specialists on our about page.