What Is an ITIN Number? The Complete Guide (2026)

What Does ITIN Stand For?

ITIN stands for Individual Taxpayer Identification Number. The name tells you exactly what it does: it identifies an individual taxpayer. The IRS assigns this number to people who have a US tax obligation but are not eligible for a Social Security Number.

You may also see it referred to as an “ITIN number” or “tax ID number.” The ITIN number meaning is straightforward: it is your personal identifier for all interactions with the IRS when you don't have an SSN.

Who Issues ITINs?

The Internal Revenue Service (IRS) is the only agency that issues ITINs. You apply by submitting IRS Form W-7, “Application for IRS Individual Taxpayer Identification Number,” along with required identity and foreign-status documents.

The IRS processes W-7 applications at its ITIN Operation center in Austin, Texas. You can submit your application by mail, in person at an IRS Taxpayer Assistance Center, or through a Certifying Acceptance Agent (CAA) who is authorized by the IRS to verify your documents on their behalf.

What Does an ITIN Look Like?

An ITIN follows the format 9XX-XX-XXXX. It looks similar to a Social Security Number. Both are 9 digits in a 3-2-4 pattern, but an ITIN always starts with the digit 9 and has a middle pair ranging from 50 to 65, 70 to 88, 90 to 92, or 94 to 99.

Some people search for “ITIN card” expecting a physical card like a Social Security card. The IRS does not issue a plastic ITIN card. Instead, you receive a CP565 notice, a paper letter that confirms your assigned ITIN. Keep this letter in a safe place; it serves as your official proof of your ITIN assignment.

Who Needs an ITIN?

Several groups of people need an ITIN to meet their US tax obligations. If you fall into any of these categories and do not qualify for an SSN, you likely need one:

• Non-resident aliens who earn income from US sources and must file a federal tax return
• Resident aliens (based on the substantial presence test) who cannot get an SSN
• Spouses of US citizens or resident aliens who are claimed on a joint tax return
• Dependents of US citizens or resident aliens who are listed on a tax return
• Non-resident alien students, professors, or researchers who file a US tax return or claim a tax treaty exemption
• Foreign investors with US-source income subject to withholding
• Foreign nationals who own US real estate and need to file related tax returns

For a detailed breakdown of each category, read our guide on who needs an ITIN.

ITIN vs SSN: Key Differences

People often confuse ITINs and Social Security Numbers because they look alike. But they serve fundamentally different purposes.

The key takeaway is that an SSN is a broader identification number tied to employment eligibility and government benefits, while an ITIN serves a single, focused purpose: tax compliance. If you are eligible for an SSN, you should always apply for one instead of an ITIN. However, if you are not eligible for an SSN and have a US tax obligation, the ITIN is the correct path forward. It is also worth noting that if you later become eligible for an SSN (for example, through a change in immigration status), you should stop using your ITIN and notify the IRS so they can merge your tax records under your new SSN.

For a full side-by-side analysis, see our detailed guide on the difference between ITIN and SSN.

ITIN vs EIN

Another common point of confusion: the ITIN vs EIN. An EIN (Employer Identification Number) is a 9-digit number the IRS assigns to businesses for tax reporting. An ITIN is assigned to individuals.

• ITIN: for individual taxpayers who cannot get an SSN. Used on personal tax returns (Form 1040, 1040-NR).
• EIN: for businesses, trusts, estates, and other entities. Used on business tax returns, payroll filings, and bank account applications for the business.

If you are a sole proprietor without an SSN, you may need both: an ITIN for your personal tax return and an EIN for your business. The EIN application (Form SS-4) requires you to have either an SSN or ITIN first.

Learn more about the ITIN vs EIN differences in our comparison guide.

How to Get an ITIN

The application process involves three steps:

1. Complete IRS Form W-7. Fill out the application with your personal information, reason for applying, and the tax return you are attaching (if required).
2. Gather identity and foreign-status documents. The IRS accepts 13 types of documents, but a valid passport is the single document that proves both identity and foreign status. Other combinations require two or more documents.
3. Submit your application. You have three options: mail it to the IRS ITIN Operation in Austin, TX; visit an IRS Taxpayer Assistance Center in person; or use a Certifying Acceptance Agent (CAA) who verifies your documents so you don't have to send originals to the IRS.

After you submit your application, the IRS will process it at their ITIN Operation center in Austin, Texas. Processing typically takes 6 to 11 weeks if you apply by mail. Once approved, you will receive a CP565 notice in the mail, which is the official letter confirming your ITIN assignment. If you need to check the status of a pending application, you can call the IRS ITIN hotline at 1-800-829-1040. During peak filing season (January through April), processing times may run closer to the 11-week end of the range, so it is wise to apply as early as possible. If the IRS needs additional information or finds an issue with your documents, they will send a notice explaining what is required before they can complete your application.

Our step-by-step walkthrough covers every detail. Read the full guide on how to get an ITIN number.

What Can You Do with an ITIN?

An ITIN opens several doors beyond basic tax filing. Here are the most important uses:

File US Tax Returns

This is the primary purpose. With an ITIN, you can file Form 1040 or 1040-NR to report US income, claim refunds, and take advantage of applicable tax credits. Spouses filing jointly also need an ITIN if they lack an SSN. If you are a non-resident alien, you will typically file Form 1040-NR, which is designed for individuals who are not considered US residents for tax purposes. Resident aliens who meet the substantial presence test but lack an SSN use the standard Form 1040 instead. Filing correctly with the right form ensures you can claim deductions and credits you are entitled to, such as the Child Tax Credit or education credits where applicable.

Open Bank Accounts

Major US banks, including Bank of America, Chase, Wells Fargo, and many credit unions, accept an ITIN to open checking accounts, savings accounts, and CDs. This gives you access to the US banking system without an SSN. Online-friendly platforms such as Mercury, Wise, and Relay also accept ITINs, which is especially useful for freelancers and entrepreneurs who need business banking. Having a US bank account lets you receive direct deposits, set up automatic bill payments, and build a financial footprint in the country. When applying, bring your CP565 notice along with a valid passport or government-issued ID, as most banks require two forms of identification for ITIN-based account openings.

Build Credit History

Some banks and credit card issuers allow ITIN holders to apply for credit cards. Responsible use builds a US credit history, which matters for future financial milestones like renting an apartment or getting a car loan. A secured credit card is often the best starting point. With a secured card, you put down a refundable deposit (typically $200 to $500) that serves as your credit limit, and the issuer reports your payment activity to the major credit bureaus. After 6 to 12 months of on-time payments, many ITIN holders qualify for unsecured cards with higher limits. Building a credit score of 680 or above opens the door to better interest rates on auto loans, favorable lease terms, and eventually mortgage eligibility.

Apply for a Mortgage

Several lenders offer mortgage programs specifically for ITIN holders. These ITIN mortgages typically require a larger down payment (15-25%) and may carry slightly higher interest rates, but they make homeownership accessible to people without an SSN. The ITIN mortgage market has been growing steadily as more community banks, credit unions, and specialized lenders recognize the demand. To qualify, most lenders ask for at least two years of US tax return history filed with your ITIN, proof of stable income, and a credit score in the mid-600s or higher. Some lenders accept alternative credit documentation, such as rent payment records and utility bill histories, if you have not yet built a traditional credit file.

Claim Tax Treaty Benefits

If your home country has a tax treaty with the United States, an ITIN allows you to claim reduced withholding rates or exemptions on certain types of US-source income, such as dividends, royalties, or scholarship income. The US maintains tax treaties with over 60 countries, and the benefits can be substantial. For example, the standard withholding rate on dividends is 30%, but many treaties reduce this to 15% or even 0%. To claim these benefits, you typically need to provide Form W-8BEN along with your ITIN to the payer of the income. Without an ITIN, the payer is required to withhold at the full 30% rate regardless of any treaty provisions.

Get a State Driver's License

Some US states accept an ITIN as proof of identification for driver's license applications. Rules vary by state, so check your local DMV requirements. States such as California, Washington, Illinois, Connecticut, and New York have programs that allow ITIN holders to obtain a driver's license or state ID card. In most cases, you will need to present your CP565 notice, a valid foreign passport, and proof of state residency such as a utility bill or lease agreement. Having a state-issued ID simplifies everyday tasks like picking up packages, verifying your identity at banks, and completing notarized transactions.

ITIN Myths vs Facts