What is an ITIN?

Every year, millions of people living, working, or investing in the United States file a federal tax return without ever holding a Social Security number. So how does the IRS put a name and a number on that return without one?

The answer is the Individual Taxpayer Identification Number, or ITIN. Whether you're a nonresident alien filing a U.S. return, a resident alien who isn't SSN-eligible, or the spouse or dependent of someone who is, the ITIN is what lets your name go on that return and lets you claim the credits you're entitled to. Get the Form W-7 application wrong and the IRS can delay your refund, deny certain credits, or reject the form outright.

Here's who actually qualifies for an ITIN, how the 2026 application and renewal process works, and exactly where an ITIN stops and a Social Security number starts.

Who Needs an ITIN?

You need an ITIN if you have a federal tax purpose, such as filing a return, claiming a refund, or being listed as a spouse or dependent for a tax benefit, and you aren't eligible for a Social Security number. The IRS allows resident aliens, nonresident aliens, and their spouses or dependents to apply for an ITIN on this basis; it isn't limited by whether you have lawful immigration status, though eligibility still depends on meeting the SSN-ineligibility and federal-tax-purpose tests above.

Common situations where people apply for an ITIN include:

• A nonresident alien who is required to file a U.S. tax return or is claiming a tax treaty benefit
• A resident alien (based on the substantial presence test or a green card) filing a U.S. tax return
• A spouse or dependent of a U.S. citizen or resident alien
• A spouse or dependent of a nonresident alien visa holder
• A nonresident alien student, professor, or researcher filing a return or claiming a treaty exception

These are the most common cases, not a complete list. The Form W-7 instructions cover the full set of qualifying reasons.

People who are eligible for an SSN should not apply for an ITIN. If that describes you, apply for a Social Security card instead.

ITIN vs SSN: What's the Difference?

An ITIN and a Social Security number look similar on paper, both are nine digits, but they serve different purposes and unlock different things. An ITIN exists strictly for federal tax administration. An SSN is broader: it's tied to work authorization and eligibility for Social Security benefits.

‍What Tax Benefits Can You Claim With an ITIN?

An ITIN doesn't create eligibility for any tax benefit on its own. It's the number that lets you or your dependent be listed on a return, so you can claim benefits you separately qualify for under the IRS's own rules for each credit.

Benefits that may be available if you meet the separate IRS requirements include, per the IRS: filing a joint return with a spouse, head of household or qualifying surviving spouse status, the American Opportunity Tax Credit, the Premium Tax Credit, the Child and Dependent Care Credit, and the Credit for Other Dependents.

Each of these has its own paperwork. The Credit for Other Dependents, for example, requires a completed Schedule 8812 attached to the return alongside the dependent's ITIN application. Missing a required form like this is a common reason the IRS denies a credit even when the ITIN itself is approved.

How Do You Apply for an ITIN?

You apply for an ITIN by submitting a completed Form W-7 together with your federal tax return and original or certified identification documents. The IRS processes the application and issues the ITIN after reviewing the package.

1. Complete Form W-7. Select the correct application reason and, if applicable, the tax treaty box.
2. Attach a complete federal tax return. Use Form 1040 or Form 1040-NR, leaving the SSN field blank for each ITIN applicant. In most cases, the IRS will not process a standalone W-7 without a return unless you qualify for a filing exception.
3. Include your identification documents. A passport alone satisfies the identity and foreign-status requirement for most applicants; otherwise you'll need a combination of documents from the IRS supporting-documents list.
4. Submit the package. Mail it to the IRS ITIN Operation in Austin, or apply in person through a Certifying Acceptance Agent, an IRS Taxpayer Assistance Center with ITIN services where available, or a Volunteer Income Tax Assistance site where available.
5. Wait for your notice. The IRS mails a notice (Form CP565) confirming assignment once your ITIN is issued.

If you'd rather have someone review your Form W-7 and supporting documents before they go to the IRS, this guide on how to apply for an ITIN number covers the same steps in more depth.

Applying with a spouse or dependents? Every applicant needs their own completed Form W-7, and all of them attach to the same tax return.

When Does an ITIN Expire?

An ITIN expires if it isn't used on a federal tax return for three consecutive tax years, with the expiration taking effect on December 31 of that third year, per the IRS. This is the rule that applies today.

Older ITINs were once also subject to a separate rolling expiration schedule tied to the middle two digits of the number. That schedule is historical: it phased out earlier batches of pre-2013 ITINs between 2016 and 2020 and no longer appears in current IRS guidance.

An expired ITIN only needs renewal if it will be used on a federal tax return. If it's used solely on information returns, such as a Form 1099, renewal isn't required.

How Do You Renew an ITIN?

You renew an ITIN the same way you originally applied: by submitting Form W-7 with your current tax return. The difference is in how you complete a few of the fields.

1. Mark the form as a renewal. In the application type section of Form W-7, select the option for renewing an existing ITIN rather than applying for a new one.
2. Provide your previous ITIN. The form asks whether you've been assigned an ITIN before; if so, enter it and the name it was issued under, so the IRS can match your renewal to your existing record. Field labels and locations can shift between form revisions, so confirm against the current version of Form W-7 before filing.
3. Attach identification documents confirming your identity and foreign status, the same categories required for a new application.
4. Include name-change documentation, if applicable, such as a marriage certificate or court order, when your legal name has changed since the ITIN was issued.
5. Submit with your return by mail or through approved in-person channels, such as a Certifying Acceptance Agent or a Taxpayer Assistance Center.

If you file with an expired ITIN before renewing it, the IRS will still process the return, but it may delay it and disallow certain credits until the renewal is complete.

Common ITIN Mistakes to Avoid

Most ITIN application delays trace back to the same handful of errors:

• Filing Form W-7 without a tax return. Unless you meet a documented filing exception, the IRS returns the package.
• Missing a required credit form. Claiming a credit without its required attachment, such as Schedule 8962 for the Premium Tax Credit or Form 2441 for the Child and Dependent Care Credit, can get the credit denied even when the ITIN itself is approved.
• Sending documents that don't meet the IRS's identification requirements. The IRS generally requires original documents or copies certified by the issuing agency, not photocopies made independently; check the ITIN supporting documents page for the accepted document types and certification requirements before you submit.
• Forgetting a spouse's or dependent's W-7. Every person listed on the return who needs an ITIN needs their own completed form.
• Continuing to use an ITIN after becoming eligible for an SSN. Once you're eligible for an SSN, you should stop using your ITIN and follow the IRS's instructions for notifying them of the change, so your tax history is properly linked to your new number.

How does GOV+ fit in the process

Before you submit anything, run through the checklist above one more time, and when your situation involves a treaty claim, a dependent without a passport, or an ITIN that may have expired, it's worth confirming the specifics with the IRS or a tax professional first.

GOV+ is designed to make sure your tax return is filed completely and accurately, with every credit and deduction you qualify for, so you're not stuck amending a return or waiting on a smaller refund than you should get.

If you need to file your federal and state taxes, here's how GOV+ can help:

• We prepare your full tax return using your W-2s and 1099s, so you don't have to navigate the forms and schedules on your own.
• Our tax experts check your return for errors and missed deductions before it's filed with the IRS.
• GOV+ walks you through exactly which credits and deductions apply to your situation, so nothing gets left off your return.
• Identity theft protection with up to $1M coverage.

Ready to get started? File your taxes with GOV+.

Frequently Asked Questions

What Is an ITIN?

An ITIN is a nine-digit number the IRS issues for federal tax reporting. It always starts with 9 and follows the format 9XX-XX-XXXX.

An ITIN is not a Social Security number, and it doesn't carry the same rights. It lets you file a federal tax return, and federal banking rules recognize it as an acceptable identifier for opening a bank account. Some states also accept an ITIN as part of a driver's license application. It does not authorize you to work in the U.S., make you eligible for Social Security benefits, or qualify you for the Earned Income Tax Credit.

What is an ITIN used for? 

An ITIN is used strictly for federal tax reporting. It lets someone who isn't eligible for a Social Security number file a return, be listed as a spouse or dependent, and claim tax credits they separately qualify for under the IRS's rules for each credit. 

Can I work with an ITIN? 

No. An ITIN doesn't authorize employment in the United States. Work authorization comes from your immigration status, not your tax identification number. 

Does an ITIN expire? 

Yes. Under the current rule, an ITIN expires if it isn't used on a federal tax return for three consecutive tax years, with the expiration taking effect on December 31 of that third year. 

How long does it take to get an ITIN? 

The IRS states standard processing takes about 7 weeks, extending to 9 to 11 weeks during tax season or for applications filed from overseas. 

Do I need an ITIN for my spouse or dependent? 

Only if they're being claimed for an allowable tax benefit or are filing their own return. Each spouse or dependent who needs an ITIN files a separate Form W-7 attached to the same return. 

Can an ITIN help with immigration status? 

No. An ITIN doesn't grant or change immigration status and isn't evidence of lawful presence. It exists solely so the IRS can process a tax return. 

References

• Individual Taxpayer Identification Number (ITIN) — IRS
• How to Apply for an ITIN — IRS
• How to Renew an ITIN — IRS
• ITIN Supporting Documents — IRS
• About Form W-7, Application for IRS Individual Taxpayer Identification Number — IRS
• Instructions for Form W-7 — IRS

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