How many numbers are in an itin number?

Question

ITINMay 25, 2026

How many numbers are in an itin number?

An ITIN (Individual Taxpayer Identification Number) consists of 9 digits, structured similarly to an SSN but with a unique prefix and format. It is assigned by the IRS to individuals who need a U.S. taxpayer identification number but do not have and are not eligible to obtain a Social Security number.

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1 Answer

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

An ITIN number contains exactly 9 digits.

This 9-digit number is assigned by the Internal Revenue Service (IRS) to individuals who are non-resident aliens, foreign nationals, or others who need a U.S. taxpayer identification number but do not have and are not eligible to obtain a Social Security Number (SSN). The format of an ITIN is 9 digits, presented in a XXX-XX-XXXX format, much like an SSN. However, ITINs are specifically for tax purposes and do not grant eligibility for employment or Social Security benefits in the United States.

Understanding the ITIN Structure

The structure of an ITIN is designed to be distinct from Social Security Numbers while maintaining a familiar format for U.S. tax administration. The nine digits are organized into three parts: the first three digits, the middle two digits, and the final four digits. The IRS assigns these numbers through a specific application process, primarily using Form W-7, Application for IRS Individual Taxpayer Identification Number. The IRS issues ITINs for various tax-related purposes, including filing U.S. federal income tax returns, claiming treaty benefits, or meeting certain U.S. tax reporting requirements.

How Many Numbers Are in an ITIN Number? The Direct Answer

To directly answer the question: there are 9 digits in an ITIN number. This is a fundamental characteristic of the ITIN system. The IRS issues these numbers to ensure that individuals required to file U.S. taxes or meet other tax obligations can do so, even if they are ineligible for an SSN. The 9-digit structure is consistent across all ITINs, regardless of the applicant's reason for needing one. This number serves as their unique identifier for all IRS interactions.

Key Characteristics of an ITIN

Beyond the number of digits, ITINs have several key characteristics that differentiate them from SSNs and other identification numbers:

Unique Prefix: ITINs are distinguished by their numbering range. While SSNs typically begin with a specific range of area numbers, ITINs are assigned numbers that do not start with the number 9. The first digit of an ITIN will not be a 9. Numbers beginning with 70, 71, 72, and 80 are no longer issued as of January 2012, and new ITINs are assigned from valid ranges.
Purpose-Driven: An ITIN is solely for tax processing. It does not authorize employment in the U.S., nor does it qualify the holder for Social Security benefits. It is strictly for fulfilling U.S. tax obligations.
No Expiration (Generally): While ITINs themselves do not expire, they can become invalid if not used on a federal tax return for three consecutive tax years. The IRS has also implemented a renewal program for ITINs that have not been used for a certain period or that fall within specific ranges identified for renewal. If your ITIN becomes invalid, you will need to reapply using Form W-7.
Application Process: Obtaining an ITIN requires submitting Form W-7 along with original or certified copies of identification documents and a supporting U.S. federal income tax return (unless an exception applies). The application can be mailed directly to the IRS, submitted through an IRS Taxpayer Assistance Center (TAC), or, more conveniently for many, through an authorized IRS Certified Acceptance Agent (CAA). Using a CAA streamlines the document verification process, as they can certify your original identification documents, eliminating the need to mail them to the IRS.

Who Needs an ITIN?

Many individuals who are not U.S. citizens or permanent residents find themselves needing an ITIN. Common scenarios include:

Non-resident aliens filing U.S. tax returns: If you are a non-resident alien and have U.S. source income that requires you to file a federal income tax return (such as Form 1040-NR), you will need an ITIN.
Individuals claiming tax treaty benefits: If you are a non-resident alien who qualifies for a reduced tax rate or exemption from U.S. taxes under an income tax treaty, you may need an ITIN to claim these benefits on your U.S. tax return.
Dependents or spouses of U.S. citizens/resident aliens: If you are a dependent or spouse of a U.S. citizen or resident alien and are filing a U.S. tax return, you will need an ITIN if you are not eligible for an SSN.
Individuals with U.S. business obligations: This can include individuals who are partners in a U.S. partnership, beneficiaries of a U.S. estate or trust, or individuals who are required to file specific informational returns, such as Form 5472 for reporting transactions with a U.S. LLC.
Opening U.S. bank accounts: While not a tax filing requirement, some U.S. financial institutions may require an ITIN to open a U.S. bank account for non-residents. This is particularly true for business accounts, where an Employer Identification Number (EIN) might be required, but for personal accounts, an ITIN can sometimes suffice.

How to Apply for an ITIN

Applying for an ITIN involves several steps, and understanding them is key to a smooth process.

Complete Form W-7: This is the primary application form. You must fill it out accurately and completely. Be sure to provide all requested information, including your name, address, foreign tax identification number (if applicable), and the reason you need an ITIN.
Gather Supporting Documentation: You need to provide original identification documents or certified copies from the issuing agency. The most commonly accepted documents are a valid passport. If a passport is not available, a combination of other documents may be accepted, such as a national identity card, a foreign driver's license, or a civil birth certificate. The IRS provides a list of acceptable documents on Form W-7's instructions. Using a Certified Acceptance Agent can simplify this step significantly, as they are authorized to review your original documents and transmit the verification to the IRS on your behalf.
Attach a U.S. Federal Income Tax Return: For most applicants, a completed U.S. federal income tax return must be attached to the Form W-7. This return should be for the tax year for which you are claiming benefits or reporting income. There are exceptions to this rule, such as for certain treaty benefits or if you are applying for an ITIN for a dependent who will not be filing a return in the current year. Consult the Form W-7 instructions or an ITIN specialist for details on exceptions.
Submit Your Application: You have three main options for submitting your application:
- Mail: Send your completed Form W-7, supporting documents, and tax return to the IRS address listed in the Form W-7 instructions. This method requires mailing original documents, which can take time to process and return.
- IRS Taxpayer Assistance Center (TAC): Some IRS TACs offer ITIN application services. You will need to make an appointment and bring your original documents. Processing times at TACs can vary.
- Certified Acceptance Agent (CAA): This is often the most convenient and secure method. CAAs are individuals or entities authorized by the IRS to help applicants submit their ITIN applications. They can verify your original identification documents on-site and forward the application package to the IRS. This avoids the need to mail your original documents. itin.net works with certified acceptance agents to facilitate the application process for ITINs, EINs, and other U.S. tax identification numbers.

Processing Times and Costs

There are no fees charged by the IRS to apply for an ITIN. The application itself is free. However, if you use a third-party service or a Certified Acceptance Agent, they may charge a fee for their assistance.

Processing times can vary significantly depending on the submission method and the IRS's current workload. Historically, processing an ITIN application by mail could take anywhere from 7 to 11 weeks, sometimes longer during peak tax seasons. Applications submitted through a CAA or at a TAC may have faster turnaround times for the initial verification, but the overall IRS processing time still applies.

It is advisable to apply well in advance of any tax filing deadlines to allow ample time for processing. If you are planning to establish a U.S. business, you will likely need both an ITIN and an EIN. An EIN, or Employer Identification Number, is used for business tax purposes and is obtained by filing Form SS-4. The application for an EIN is separate from the ITIN application.

Common Mistakes to Avoid

When applying for an ITIN, several common mistakes can lead to delays or rejections:

Incomplete or inaccurate Form W-7: Ensure all fields are filled out correctly. Missing information or errors can cause the IRS to return your application.
Improper documentation: Submitting photocopies instead of original documents or certified copies, or not providing the required set of documents, is a frequent issue. If you are not using a CAA, remember that the IRS will only return your original documents after processing your application, which can take months.
Forgetting the Tax Return: Most applications must include a valid U.S. federal income tax return. If you forget to include it or it is not properly prepared, your application will be rejected.
Incorrectly applying for an ITIN when an SSN is available: An ITIN is only for those ineligible for an SSN. Attempting to get an ITIN when you qualify for an SSN can lead to complications.
Not understanding ITIN renewal requirements: As mentioned, ITINs can become invalid if not used or if they fall into specific ranges designated for renewal. Failure to renew an ITIN when required will result in its invalidation, necessitating a new application.

What Happens After You Get Your ITIN?

Once your ITIN application is approved, the IRS will mail you an official notification letter containing your 9-digit ITIN. This letter is important for your records. You can then use this ITIN for all U.S. tax-related purposes, including filing your tax returns.

It's crucial to keep your ITIN information secure, just like you would an SSN. If you move, you must notify the IRS of your address change to continue receiving important tax notices.

For individuals planning to conduct business in the U.S., obtaining an ITIN is often the first step. Subsequent steps might include forming a U.S. LLC and obtaining an EIN. A U.S. LLC provides a legal structure for your business, and an EIN is necessary for tax reporting and opening business bank accounts. The process of forming a U.S. LLC can be complex, involving state registrations and operating agreements. For those needing to establish a U.S. business presence, understanding the interplay between ITIN, EIN, and LLC formation is vital.

Seeking Assistance for Your ITIN Application

Navigating the U.S. tax system can be challenging, especially for individuals unfamiliar with its complexities. The IRS offers resources, and utilizing a Certified Acceptance Agent (CAA) can significantly simplify the ITIN application process. CAAs are trained professionals who can guide you through the application, verify your documentation, and submit your Form W-7 package to the IRS. This can save you time and the anxiety of mailing sensitive original documents. If you require assistance with your ITIN application or have complex tax situations, consulting with a tax professional or utilizing services like those offered by itin.net can provide the necessary support. For more information on ITINs and related U.S. tax matters, you can visit our Q&A section.