Form W-7 (ITIN Application)

Form W-7 is the IRS form by which a non-citizen who is not eligible for a Social Security number applies for, renews, or replaces an Individual Taxpayer Identification Number (ITIN). The ITIN is a nine-digit number in the format 9XX-XX-XXXX (with the fourth and fifth digits in a specific range) used by the IRS purely for federal tax purposes, per Internal Revenue Code section 6109. For US companies paying foreign contractors who want to claim a tax treaty rate on US-source income, a valid ITIN on a Form W-8BEN is usually required, and Form W-7 is the route to get there.

How Form W-7 Works

Form W-7 collects identification data and documents the applicant’s reason for needing an ITIN. The applicant must:

1. Complete Form W-7 (latest revision available at the IRS About Form W-7 page)
2. Attach the federal tax return that requires the ITIN, unless the applicant qualifies for an exception (such as treaty benefit claim on US-source passive income)
3. Submit supporting identification documents. A passport is the only stand-alone document. Otherwise the applicant supplies two or more of national ID card, US driver’s license, foreign driver’s license, US state ID, foreign voter registration card, birth certificate, school record, or medical record for dependents under 6.

Submission can be by mail to the Austin ITIN Operation, in person at an IRS Taxpayer Assistance Center (TAC), or through a Certifying Acceptance Agent (CAA). See Instructions for Form W-7 for the full requirements.

Who Needs an ITIN

Per IRS guidance on ITINs:

• A nonresident alien who must file a US tax return
• A US resident alien filing a US return based on days of presence
• A dependent or spouse of a US citizen or resident alien
• A dependent or spouse of a nonresident alien visa holder
• A nonresident alien claiming a tax treaty benefit (the most common contractor scenario)
• A nonresident alien student, professor, or researcher filing a US return or claiming an exception

A foreign individual who is paid by a US business and wants to use a US treaty rate to reduce the default 30 percent chapter 3 withholding on US-source FDAP income typically needs an ITIN on their Form W-8BEN treaty claim.

Processing Timeline

Per the IRS ITIN page:

• Standard processing time: Approximately 7 weeks from receipt of a complete W-7 package
• Peak season (January 15 through April 30): 9 to 11 weeks
• Applications mailed from outside the US: Add additional time for international mail
• CAA processing: Same IRS timeline once received, but no risk of original-document loss during transit
• ITIN assignment notice (CP565): Mailed to the applicant once the number is assigned

Three-Year Non-Use Expiration

Section 6109(i)(3) was added by the Protecting Americans from Tax Hikes (PATH) Act of 2015. An ITIN that is not used on a federal tax return for three consecutive years expires on December 31 of the third consecutive non-use year. Renewal is done by filing a new Form W-7 with the box checked for renewal and supplying the supporting documents again.

The IRS publishes annual lists of ITINs that will expire and treats returns filed with an expired ITIN as if no TIN were provided, which can disallow refundable credits and trigger backup-withholding cycles upstream.

Penalties

There is no penalty directly attached to a missing W-7. The consequences live elsewhere:

• Default 30 percent withholding. Without a valid TIN on Form W-8BEN, the US payer must default to 30 percent chapter 3 withholding on US-source FDAP, even if a treaty would otherwise reduce it.
• Backup withholding. US-source income that is reportable on Form 1099 to a payee without a TIN is subject to 24 percent backup withholding.
• Disallowance of credits. A return filed with an expired or missing ITIN can be processed without the dependent, treaty, or other claims that required the TIN.

Common Pitfalls

• Sending an original passport by international mail. The IRS will accept and return originals, but loss in transit is a real risk. A CAA can certify the passport in person and submit a Form W-7 (COA) Certificate of Accuracy instead.
• Submitting W-7 without a return. Most W-7 applications must accompany a federal return. Filing W-7 alone is rejected unless the applicant qualifies for one of the section 1.6038A or treaty-claim exceptions in the W-7 instructions.
• Letting the ITIN expire. A contractor whose ITIN has expired silently is functionally untaxed at the right rate. Refresh ITINs along with W-8BEN expiration cycles.
• Confusing ITIN with EIN or SSN. The three are mutually exclusive. An individual gets an SSN (eligible) or an ITIN (not SSN eligible). An entity gets an EIN. Misidentified TIN types are a frequent B-notice driver.

Related Forms and Terms

• ITIN: the tax-processing number Form W-7 produces.
• Form W-8BEN: the certificate of foreign status on which the ITIN is typically used.
• Form W-9: the US-person counterpart that requires a US TIN (SSN, ITIN, or EIN).
• Backup Withholding: the 24 percent withholding that hits when a TIN is missing.

Omnivoo Contract Management prompts non-US contractors at onboarding for an ITIN where treaty rates apply, tracks ITIN expiration cycles, and stores the certified Form W-7 acknowledgment alongside the W-8BEN for audit support.