International Tax
Form W-7
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
International Taxation
US tax returns and foreign asset reporting for Americans abroad, foreign nationals in the US, and anyone holding offshore accounts or entities.
Learn how TS CPA handles Form W-7Related Tax Forms
1040
Form 1040
The annual federal income tax return filed by US citizens and resident aliens to report income, deductions, credits, and tax liability.
2555
Form 2555
The IRS form used by US citizens and resident aliens living abroad to exclude up to a statutory limit of foreign-earned wages and self-employment income from US taxation.
1116
Form 1116
A dollar-for-dollar credit on the US tax return for income taxes paid to a foreign country, designed to prevent double taxation.
Related Tax Terms
Foreign Earned Income Exclusion (FEIE)
A tax provision allowing qualifying US citizens and residents living abroad to exclude a portion of foreign-earned wages and self-employment income from US taxation.
Foreign Tax Credit (FTC)
A dollar-for-dollar credit on the US tax return for income taxes paid to a foreign country, designed to prevent double taxation.
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