Form W-7
Application for IRS Individual Taxpayer Identification Number (ITIN)
The IRS form for non-US persons who need a Taxpayer Identification Number to file a US tax return or claim a tax treaty benefit but are not eligible for a Social Security Number.
Who Files Form W-7
Foreign nationals (and their family members) who must file a US tax return or have US-source income reportable to the IRS but cannot obtain a Social Security Number. Common scenarios: nonresident aliens with US rental income, dependents of foreign workers on US visas, foreign spouses being claimed on a joint return, and foreign real estate investors subject to FIRPTA withholding.
What Form W-7 Reports
Form W-7 collects identifying information and documents foreign or alien status. Original passport (or certified copy from the issuing agency) is the standard supporting document; without a passport, two other documents are required. The form is filed with the original tax return at the IRS ITIN Operation in Austin or via an IRS-authorized Certifying Acceptance Agent (CAA). Once issued, the ITIN is valid for filing and treaty claims.
Key Deadlines
- File Form W-7 with the original tax return at filing time (do not file separately if a return is required)
- ITINs that have not been used on a federal return for three consecutive years expire and must be renewed via Form W-7
Common Mistakes
- Filing Form W-7 without the accompanying tax return (returns it as incomplete)
- Sending an uncertified copy of the passport (only originals or certified copies from the issuing agency are accepted)
- Missing the expiration of an existing ITIN that has not been used for three years
- Confusing ITIN (for filers) with EIN (for businesses) or ATIN (for adoption pending)
Best Practices
- Apply for the ITIN with the original tax return. ITIN-only applications without a return are rejected.
- Use a Certifying Acceptance Agent (CAA) instead of mailing the original passport to the IRS. CAA-certified applications are processed faster and you keep your passport.
- Renew expired ITINs before the tax season starts. ITINs not used on a return for three consecutive years expire automatically.
- For dependent ITIN applications, attach proof of US residency (school records, medical records). The IRS rejects undocumented dependent ITIN applications.
- For treaty exemption claims, attach the treaty article and country reference. Form 8233 may also be required for compensation income.
Related TS CPA Service
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Expert cross-border tax compliance for expats, foreign nationals, and global businesses, penalties prevented, treaties optimized.
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Related Tax Terms
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