Do I Need an ITIN and How Do I Apply For One?
You need an Individual Taxpayer Identification Number (ITIN) if you must file a U.S. tax return or be listed on one but are not eligible for a Social Security Number (SSN). This commonly applies to non-U.S. spouses, dependents, and certain foreign nationals with U.S. tax reporting requirements.
Do You Actually Need an ITIN?
What is an ITIN Number?
An Individual Taxpayer Identification Number (ITIN) is a tax processing number issued by the IRS to individuals who must have a U.S. taxpayer identification number but are not eligible for a Social Security Number (SSN).
ITINs are used only for federal tax reporting and do not authorize work, provide immigration status, or grant Social Security benefits.
What an ITIN does not do
An ITIN does not:
- Authorize employment in the U.S.
- Provide eligibility for Social Security benefits
- Qualify a dependent for the Earned Income Tax Credit (EITC)
Who Needs an ITIN?
You may need an ITIN if you cannot obtain an SSN and must file a U.S. federal tax return, be listed on a return, or claim a tax treaty benefit.
Common situations include:
- A nonresident alien required to file a U.S. tax return
- A U.S. resident alien filing a U.S. tax return but not eligible for an SSN
- The spouse or dependent of a U.S. citizen or resident alien
- The spouse or dependent of a nonresident visa holder
- A nonresident alien claiming a tax treaty benefit
- A nonresident student, professor, or researcher with a U.S. filing requirement or exception
How Do I Apply For an ITIN?
To obtain an Individual Taxpayer Identification Number (ITIN), you must submit IRS Form W-7 with a valid U.S. federal tax return and proof of identity to the IRS.
Step-by-step ITIN application process
- Complete Form W-7
- Attach your U.S. federal tax return, unless you qualify for an IRS exception.
- Provide original identification documents or IRS-certified copies.
A passport is the most commonly accepted form of identification. - Submit the application to the IRS ITIN Operations Center at:
Internal Revenue Service
Austin Service Center
ITIN Operation
P.O. Box 149342
Austin, TX 78714-9342
Apply through a Certified Acceptance Agent (CAA)
You may also apply through an IRS-authorized Certified Acceptance Agent (CAA).
A CAA reviews your documents and issues a Certificate of Accuracy, allowing you to avoid mailing your original passport to the IRS. This option often reduces risk, delays, and rejected applications.
As an IRS-authorized Certified Acceptance Agent, Greenback can guide you through the ITIN process from start to finish with clear support and accurate filing.
Does an ITIN Ever Expire?
Yes. An Individual Taxpayer Identification Number (ITIN) expires if it is not used on a U.S. federal tax return for three consecutive years. When this happens, the ITIN becomes inactive on the last day of the third consecutive year and must be renewed before it can be used again.
If you receive an IRS notice that your ITIN is expiring and you plan to file a tax return or claim a refund, begin the renewal process as soon as possible to avoid processing delays. To confirm whether your ITIN is still valid, follow this guide.
After a successful renewal, the IRS issues Notice CP565, confirming your renewed ITIN.
Need an ITIN or Help With Your U.S. Expat Taxes?
Greenback’s expat-specialist accountants can help you apply for or renew an ITIN, prepare your U.S. tax return, and stay fully compliant with U.S. expat tax rules. As an IRS-authorized Certified Acceptance Agent, Greenback can also assist with Form W-7 documentation and submission.
If you’re ready to be matched with a Greenback accountant, click the Get Started button below. For general questions on U.S. expat taxes or working with Greenback, contact our Customer Champions.
Get Your ITIN Approved Without Guesswork
This article is for informational purposes only and does not constitute tax, legal, or financial advice. U.S. tax rules for expats and ITIN applicants vary based on individual circumstances. For guidance specific to your situation, please consult a qualified tax professional. You can contact the Greenback Expat Tax Services team for tailored support.
