What Documents Are Required for an ITIN Application?
The IRS has strict requirements regarding which documents are accepted and how they must be submitted.
According to the official IRS Form W-7 Instructions, applicants must provide original documents or certified copies issued by the original agency.
Primary Documents Required for an ITIN Application
The most commonly accepted document is a valid passport.
A passport is preferred because it generally satisfies both:
- Identity verification
- Foreign status verification
The IRS explains accepted documents here:
Other Acceptable Supporting Documents
If a passport is unavailable, applicants may need to provide multiple documents.
Possible supporting documents include:
- National identification card
- Foreign voter registration card
- Civil birth certificate
- Driver’s licence
- Visa records
- U.S. immigration documentation
- Medical records (for dependents)
- School records (for dependents)
Document Requirements for Dependents
Dependent applications may require additional documentation.
The IRS may request:
- Birth certificates
- School records
- Medical records
- Residency evidence
Special rules often apply to dependent applications.
Original Documents vs Certified Copies
The IRS generally requires:
- Original documents
OR - Certified copies issued by the original agency
Notarised copies are often not accepted unless they meet specific IRS standards.
Why Identity Verification Matters
One major concern for UK residents is mailing original passports internationally.
An IRS-authorised Certifying Acceptance Agent (CAA) may help verify documents without requiring original passports to be mailed directly to the IRS.
The IRS explains the Acceptance Agent Program here:
Common Documentation Mistakes
Applications are frequently delayed because of:
- Expired passports
- Incomplete documentation
- Uncertified copies
- Name mismatches
- Missing residency proof
Ensuring all documents meet IRS requirements is essential for avoiding delays.
Final Thoughts
Preparing the correct documentation is one of the most important parts of the ITIN application process.
Because IRS requirements can be strict and highly technical, many UK residents choose professional assistance to help ensure documents are prepared correctly before submission.
For professional ITIN document review and application support, visit:
Wide Range of ITIN Services in UK
We provide end-to-end ITIN and identity verification services, all handled remotely and in full compliance with IRS standards.
ITIN for Dependents & Family Members
ITIN services for spouses and dependents listed on U.S. tax returns.
ITIN Renewal Services
Expired or expiring ITINs can delay tax filings. We help renew your ITIN accurately and on time.
ITIN Application Assistance
Professional preparation and submission of IRS Form W-7 with supporting documentation.
ITIN Rejection & Correction Support
If your ITIN was rejected, denied, or returned, we analyse the reason and correct the application.
Taxpayer Identity Verification Services
IRS-compliant identity and document verification performed by a Certified Acceptance Agent