An Individual Taxpayer Identification Number (ITIN) is a tax processing number issued by the IRS for individuals who cannot obtain a Social Security Number but need to file U.S. taxes. According to IRS data, over 4.5 million active ITINs are currently in use across the United States, helping foreign nationals, non-resident aliens, and their dependents comply with federal tax obligations.
Understanding which documents you need for your ITIN application can feel overwhelming, especially when dealing with original identification papers and strict IRS requirements. This comprehensive guide walks you through every document required, certification options, and step-by-step instructions to ensure your application gets approved the first time. You’ll learn exactly what the IRS accepts, how to protect your original documents, and common mistakes that cause delays.
What Is an ITIN and Why Do You Need One?
Extractive Answer: An ITIN is a nine-digit tax identification number (format: 9XX-XX-XXXX) issued by the IRS to individuals without Social Security Numbers who must file federal tax returns or comply with U.S. tax laws.
The IRS created ITINs specifically for tax administration purposes. Whether you’re a foreign national earning U.S.-source income, a non-resident alien required to file taxes, or a dependent of a U.S. taxpayer, an ITIN allows you to meet your federal tax obligations legally.
Here’s when you need an ITIN:
- Filing a U.S. federal tax return as a non-resident alien
- Claiming dependents on a U.S. tax return
- Receiving income from U.S. sources (dividends, rent, royalties)
- Opening a U.S. bank account at certain institutions
- Applying for certain types of loans or mortgages
- Claiming tax treaty benefits
Pro Tip: ITINs are for federal tax purposes only. They don’t authorize you to work in the U.S. or qualify you for Social Security benefits.
What Are the Primary Documents Required for an ITIN Application?
Extractive Answer: You need Form W-7, one original or certified copy of your passport, or two alternative identification documents from the IRS-approved list, plus a valid tax return or exception documentation.
The IRS has strict requirements about which documents they accept. Let’s break down each requirement in detail.
Form W-7: Application for IRS Individual Taxpayer Identification Number
Form W-7 is the foundation of your ITIN application. You must complete every applicable section accurately, including:
- Personal information (full legal name as shown on documents)
- Mailing address (foreign or domestic)
- Birth information (date and country)
- Country of citizenship
- Type of visa (if applicable)
- Reason for applying (checkbox a through h)
- Supporting documentation attached
You can easily complete your itin application online using professional services that guide you through each field and check for errors before submission.
Identification Documents: The IRS Approved List
The IRS accepts 13 types of identification documents. Here’s the complete breakdown:
| Document Type | Standalone or Combination | Requirements |
| Passport | Standalone (proves identity and foreign status) | Must be current and not expired |
| National identification card | Must show photo, name, address, DOB, expiration date | From country of citizenship |
| U.S. driver’s license | Combination only | Valid, unexpired |
| Civil birth certificate | Combination only | Must show full name and DOB |
| Foreign driver’s license | Combination only | From country of residence |
| U.S. state ID card | Combination only | Current and valid |
| Foreign voter registration card | Combination only | Must show photo and address |
| U.S. military ID card | Combination only | For dependents of military personnel |
| Foreign military ID card | Combination only | Current and valid |
| Visa | Combination only | Must be current |
| U.S. Citizenship and Immigration Services photo ID | Combination only | Current USCIS documents |
| Medical records | Dependents under 6 only | Must show name and date of birth |
| School records | Dependents under 14, under 18 if student | Must show name and date of birth |
Tax Return or Exception Documentation
You cannot apply for an ITIN without a tax-related reason. The IRS requires one of these:
- A completed federal tax return (Forms 1040, 1040-NR, 1040-SR, etc.)
- Exception documentation if you qualify to apply without a tax return
The most common exceptions include:
- Third-party withholding on passive income (Exception 1-d)
- Benefits under a tax treaty (Exception 2-b)
- Dependent of U.S. citizen or resident alien (Exception 2-a)
- Spouse of U.S. citizen or resident alien (Exception 2-a)
Important: If you’re applying with a tax return, don’t file it separately. Attach it to your Form W-7 and mail everything together.
How Do You Prepare Your Documents for ITIN Submission?
Extractive Answer: You must submit either original documents or certified copies from the issuing agency. Notarized copies are not acceptable unless certified by the issuing agency, and photocopies will result in application rejection.
Document preparation causes more application rejections than any other factor. The IRS has zero tolerance for improperly prepared documents.
Original Documents vs. Certified Copies
The IRS accepts two types of documentation:
Original Documents: The actual passport, birth certificate, or ID card issued by the government agency. The IRS will examine these and return them within 60 days. However, sending originals creates risk if documents are lost in transit.
Certified Copies: Copies certified by the original issuing agency only. For example, if you need a certified copy of your birth certificate, you must obtain it from the vital records office in your birth country, not from a notary public.
Here’s what the IRS will reject:
- Photocopies or scanned copies
- Notarized copies (unless the notary is the original issuing agency)
- Copies certified by anyone other than the issuing agency
- Expired documents
- Damaged or illegible documents
Using Certifying Acceptance Agents (CAAs)
Certifying Acceptance Agents offer a safer alternative to mailing original documents. These IRS-authorized individuals and businesses can:
- Review your original documents in person
- Certify copies of your documents
- Submit your application to the IRS
- Return your originals immediately
The IRS accepts CAA-certified copies the same as agency-certified copies. This service typically costs between $50 and $150 per application but protects your irreplaceable documents from loss or damage during mail transit.
What Documents Are Required for Dependent ITIN Applications?
Extractive Answer: Dependents need the same identification documents as primary applicants, but children under 6 can use medical records, and those under 18 can use school records as supporting documentation.
Applying for dependents follows similar rules but offers additional documentation options for minors.
Documents for Children Under Age 6
The IRS recognizes that young children may not have extensive identification documents. For children under 6, you can submit:
- Passport (best option)
- Civil birth certificate plus one additional document
- Medical records showing name and date of birth
- National identification card (if available from birth country)
Medical records must include the child’s full name matching the birth certificate and date of birth. Hospital records, vaccination records, and pediatrician records all qualify.
Documents for Children Ages 6-17
Children and teenagers need more robust identification. Acceptable combinations include:
- Passport alone (most straightforward)
- Birth certificate plus school records
- Birth certificate plus foreign national ID card
- Birth certificate plus medical records (under age 14)
School records must be on official letterhead, include the school seal or administrator signature, and show the child’s full name and date of birth.
Special Considerations for Foreign-Born Dependents
If your dependent was born outside the United States, additional considerations apply:
Translation requirements: Any document not in English must be accompanied by a certified English translation. The translator must certify that they’re competent in both languages and that the translation is accurate.
Apostille requirements: Some countries require an apostille stamp for documents used abroad. While the IRS doesn’t specifically require apostilles, having one can prevent questions about document authenticity.
Document availability: Not all countries issue the same types of identification. Research what’s available from your country of citizenship and plan accordingly.
What Is the Complete Step-by-Step ITIN Application Process?
Extractive Answer: Complete Form W-7, gather required identification documents (original or certified), attach your tax return or exception documentation, and mail everything to the designated IRS address or submit through a Certifying Acceptance Agent.
Now that you understand the documents required, let’s walk through the complete application process.
Step 1: Determine Your Eligibility and Reason for Applying
Review the reason boxes on Form W-7 (boxes a through h). Select the one that applies to your situation:
- Box a: Nonresident alien required to file a U.S. tax return
- Box b: U.S. resident alien filing a U.S. tax return
- Box c: Dependent of U.S. citizen or resident
- Box d: Spouse of U.S. citizen or resident
- Box e: Nonresident alien student, professor, or researcher
- Box f: Dependent/spouse of nonresident alien with U.S. visa
- Box g: Other (specify)
- Box h: Third-party withholding
Step 2: Complete Form W-7 Accurately
Fill out every required field on Form W-7. Common mistakes include:
- Name inconsistencies between the form and supporting documents
- Missing signatures (both applicant and delegate if applicable)
- Incorrect date formats (use MM-DD-YYYY)
- Incomplete address information
- Missing foreign address when applicable
The form requires your signature and date. If someone prepares the form for you, they must sign as a delegate and provide their information.
Step 3: Gather Your Identification Documents
Collect your identification documents based on the requirements we’ve covered. Remember:
- One passport serves as standalone documentation
- Without a passport, you need two documents (one proving identity, one proving foreign status)
- All documents must be current and unexpired
- Dependents under 18 have additional options
Step 4: Prepare Your Tax Return or Exception Documentation
Most applicants attach a completed federal tax return to Form W-7. Don’t file the tax return separately through regular channels. Instead:
- Complete your tax return fully (1040-NR, 1040, etc.)
- Sign and date the return
- Attach it to Form W-7
- Include all schedules and supporting forms
If you qualify for an exception, include the exception documentation specified in the Form W-7 instructions for your exception category.
Step 5: Submit Your Application Package
You have three submission options:
Mail to IRS: Send your complete package to: Internal Revenue Service Austin Service Center ITIN Operation P.O. Box 149342 Austin, TX 78714-9342
Through a Certifying Acceptance Agent: Find an IRS-authorized CAA near you who can review your documents, certify copies, and submit your application.
At an IRS Taxpayer Assistance Center: Schedule an appointment at a TAC office where staff can review your documents and process your application.
Pro Tip: Use certified mail with return receipt when mailing your application. This provides proof of delivery and tracking information.
How Long Does ITIN Processing Take and What Happens Next?
Extractive Answer: ITIN applications typically take seven to eleven weeks to process during regular periods and up to fourteen weeks during peak tax season, with the IRS mailing your ITIN assignment letter to your address.
After the IRS receives your complete application, processing times vary based on season and application volume.
Standard Processing Timeline
Here’s what to expect:
- Weeks 1-2: IRS receives and logs your application
- Weeks 3-6: Document review and verification
- Weeks 7-9: ITIN assignment and letter preparation
- Weeks 9-11: Assignment letter mailed to you
During peak filing season (January through April), add two to three additional weeks to these timeframes.
Checking Your Application Status
You can check your ITIN application status by calling the IRS at 1-800-829-1040. You’ll need:
- Your complete mailing address
- Your date of birth
- The date you submitted your application
Wait at least seven weeks before calling, as applications take time to enter the IRS system.
What If Your Documents Are Returned?
The IRS returns your original documents separately from your ITIN assignment letter. Expect your documents back within 60 days of submission. They arrive in a separate envelope with tracking information.
If your documents don’t arrive within 14 weeks, call the IRS immediately at the number above to request a trace.
What Resources and Support Are Available for ITIN Applicants?
Extractive Answer: Resources include IRS Publication 1915, the official Form W-7 instructions, IRS phone support at 1-800-829-1040, Taxpayer Assistance Centers, Certifying Acceptance Agents, and professional ITIN application services.
You don’t have to navigate the ITIN process alone. Multiple resources can help ensure success.
Official IRS Resources
IRS Publication 1915: Understanding Your IRS Individual Taxpayer Identification Number provides comprehensive guidance in multiple languages.
Form W-7 Instructions: The official instructions include detailed explanations, examples, and exception documentation requirements.
IRS Website: Visit IRS.gov/ITIN for updated information, FAQs, and downloadable forms.
IRS Phone Support: Call 1-800-829-1040 (within the U.S.) or 1-267-941-1000 (international) Monday through Friday, 7:00 AM to 7:00 PM local time.
Certifying Acceptance Agents
CAAs are IRS-authorized individuals and businesses specifically trained to help with ITIN applications. Benefits include:
- Document review before submission
- Error checking and correction
- Document certification (protecting originals)
- Direct submission to IRS
- Status follow-up
Find authorized CAAs through the IRS website’s agent locator tool.
Professional ITIN Services
Professional services like itin application online platforms guide you through the entire process with:
- Step-by-step form completion
- Document requirement checklists
- Error detection and correction
- Submission tracking
- Customer support
These services typically cost between $50 and $200 but significantly reduce rejection risk and processing delays.
Conclusion:
Applying for an ITIN becomes much easier when you understand the required documents and follow the IRS guidelines carefully. By submitting the correct identification, completing Form W-7 accurately, and avoiding common mistakes, you can improve your chances of approval and avoid unnecessary delays.
