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Connect on LinkedInLiving abroad doesn’t exempt you from filing a U.S. federal income tax return, but it can complicate the details. One of the most common issues expats run into has nothing to do with foreign income or tax credits – it’s identification.
If your spouse or dependent doesn’t have a Social Security number (SSN), you may need an ITIN number in order to file properly and claim certain tax benefits. Without the correct identification number, the IRS can reject your return, delay your refund, or disallow credits.
Understanding when an ITIN is required (and when it isn’t) helps you stay on top of filing rules and avoid months-long delays in getting your return accepted or your refund released.
📋 Key Updates for 2026
- The Earned Income Tax Credit (EITC) continues to be limited to filers with valid SSNs for taxpayers, spouses, and qualifying children.
- ITIN renewal continues to be required if an ITIN has not been used on a U.S. federal income tax return for three consecutive tax years and will be included on a current-year return.
- Tax processing for returns with an initial ITIN application process typically runs 7-11 weeks during peak season.
What is an ITIN – and how is it different from an SSN?
An Individual Taxpayer Identification Number (ITIN) is issued by the Internal Revenue Service (IRS) for federal tax purposes. It is a nine-digit number that looks similar to a Social Security number but serves a very different function.
An ITIN:
- Is used for federal tax purposes, such as federal tax returns and other information or reporting forms
- Does not grant work authorization in the United States
- Does not provide immigration status
- Does not qualify someone for Social Security benefits
By contrast, a Social Security number is issued by the Social Security Administrations (SSA) and is used for employment, benefits eligibility, and tax reporting.
💡 Pro Tip:
Not every spouse or dependent needs an ITIN—one is only required if you’re including them on a U.S. tax return or claiming certain credits, so double-check your situation before starting the application.
When to get (or renew) an ITIN
Whether you need an ITIN depends on how you’re filing and who you’re claiming:
Filing jointly with a non-U.S. spouse
If you choose to file married filing jointly and your spouse does not have an SSN, they have to obtain an ITIN. The IRS requires a valid taxpayer identification number for both spouses on a joint U.S. tax return. (This situation often arises when a U.S. citizen abroad elects to treat a nonresident spouse for U.S. resident tax purposes. But without an ITIN, the joint return can’t be processed properly.)
Claiming a dependent without an SSN
If you’re claiming a child or other qualifying dependent who does not have an SSN, that individual generally needs an ITIN.
This often applies to:
- Children abroad who have not yet received a Social Security number
- Certain qualifying relatives living outside the U.S.
Keep in mind that some credits have additional or strict SSN requirements. For example, the Child Tax Credit now requires a valid SSN for both the qualifying child and the taxpayer claiming the credit (so an ITIN holder with no SSN-holding spouse cannot claim the CTC at all) and the Earned Income Tax Credit demands a work-authorized SSN, ITINs don’t qualify.
If a required SSN or ITIN is missing:
- The IRS may reject your return
- Refunds can be delayed
- Credits may be denied
- E-filing may not be available
Many expats also need to think about ITIN renewal, not just initial applications. If an ITIN hasn’t been used on a federal income tax return for three years, it expires and has to be renewed before the taxpayer can claim credits or file again. This means that even if your spouse or dependent already has an ITIN, you may need to renew it if it has been sitting unused for several tax years or if you receive an IRS notice (like a CP-48) indicating renewal is required.
💡 Pro Tip:
If you know your spouse of dependent has an ITIN that hasn’t been used on a return in several years, proactively renew it before filing—this avoids last-minute surprises and keeps credits and refunds on track.
How to apply for an ITIN from abroad
To apply for an ITIN, complete form W-7 and file it with the IRS. This is typically filed alongside your federal income tax return.
You have to provide documentation proving identity and foreign status such as an original passport, a driver’s license, or a certified copy from the issuing agency. Many expats work with an IRS-authorized Certifying Acceptance Agent (CAA) to avoid mailing original documents internationally, or visit an IRS Taxpayer Assistance Center (TAC) in person if they are in the U.S. and one is accessible. Documentation requirements vary depending on the individual’s circumstances, so it’s important to confirm what is needed for your specific situation.
Processing times vary, and during peak filing season can extend several weeks or longer. Your tax return will not be processed—and any refund will not be issued—until the ITIN is assigned.
E-filing is generally not available when an initial ITIN application is attached. In this instance, the tax form has to be mailed.
💡 Pro Tip:
If you’re applying or renewing an ITIN from abroad, consider using an IRS-authorized CAA to have your documents certified locally instead of mailing sensitive documents.
Make sure your ITIN and filing are in sync
Living abroad doesn’t exempt you from the U.S. filing requirement, but the need for an ITIN number can turn a simple return into a months-long tax processing saga. Residency, tax treaty positions, dependents without SSNs, and IRS form W-7 deadlines all affect whether your federal income tax return is accepted on time and your refund is issued without delay.
Bright!Tax helps expats handle ITIN renewal, first-time ITIN application process, and supporting documentation correctly so your spouse or dependent stays compliant with tax laws and qualifies for the right benefits without tripping up on an IRS form or tax return rejection. Want a clean, credit-friendly setup for your situation? Get in touch to get started.
Frequently Asked Questions (FAQ)
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What is an ITIN?
An ITIN, or individual tax identification number, is a nine-digit number the IRS issues for federal tax purposes to people who need a U.S. taxpayer ID but are not eligible for a Social Security number. It is not a work permit, does not create immigration status, and does not qualify someone for Social Security benefits or the Earned Income Tax Credit.
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Who usually needs an ITIN when living abroad?
The most common expat cases involve a spouse or dependent who needs to appear on a U.S. tax return but does not have an SSN. The IRS says spouses and dependents are only eligible for an ITIN when they are being claimed for an allowable tax benefit or have their own federal tax filing requirement.
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Does my non-U.S. spouse need an ITIN to file jointly with me?
Usually, yes. If you choose to file a joint U.S. return and your spouse is not eligible for an SSN, they generally need an ITIN so the IRS can process the return properly. Form W-7 is the application for IRS individual taxpayer identification number used for that purpose.
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Does every dependent without an SSN need an ITIN?
Not always. A dependent generally needs an ITIN only if you are actually claiming them on the return or claiming a tax benefit tied to them. The IRS also says some dependent applicants must meet additional documentation rules, including residency-related requirements, unless an exception applies.
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Can I claim the Child Tax Credit or EITC with an ITIN?
Not for the main SSN-based versions of those credits. The IRS says a child with an ITIN does not qualify for the Child Tax Credit, and the Earned Income Tax Credit requires valid SSNs for the taxpayer, spouse if filing jointly, and any qualifying child.
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How do I apply for an ITIN from abroad?
You apply using Form W-7 and, in most cases, attach it to a U.S. federal tax return unless you meet a listed exception. The IRS says applicants abroad can submit the package by mail with original or certified documents, use a Certifying Acceptance Agent, or in some cases visit an IRS Taxpayer Assistance Center if they are in the United States.
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Where can I find the official form and instructions?
The IRS website has both Form W-7 and the instructions online, including the latest guidance on supporting documents, renewal, and how to file. On the IRS forms page, Form W-7 is listed as the Application for IRS Individual Taxpayer Identification Number.
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Do I have to mail original documents to the IRS?
Not necessarily. The IRS says you can submit original documents, certified copies from the issuing agency, or use an IRS-authorized Acceptance Agent or Certifying Acceptance Agent to help review and submit the package. That is often a more practical option from abroad than mailing an original passport and hoping the international post has a kind soul that day.
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Can I e-file if I’m submitting a first-time ITIN application?
Generally, no. The IRS says first-time ITIN applicants usually submit Form W-7 with the tax return and supporting documents as one package, which means the return is typically mailed rather than e-filed.
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How long does an ITIN application take?
The IRS says to allow about seven weeks, or nine to eleven weeks during peak filing periods or when applying from abroad. That timing matters because the related tax return and any refund are usually held up until the ITIN is assigned.
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Do ITINs expire?
Yes. The IRS says an ITIN expires if it is not used on a U.S. federal tax return for three consecutive tax years, and if you need it again after that, it must be renewed before use on a current return.
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Can an ITIN be used to open a bank account or work in the U.S.?
An ITIN is issued for federal tax purposes only. The IRS says it does not authorize someone to work in the United States and does not change immigration status. Whether a bank accepts it for opening a bank account is a separate question set by the bank, not something the IRS guarantees on its own pages.
