ITIN Rejection Reasons 2026: Top 10 Reasons Applications Get Denied

Reason 1: Missing or Incomplete Supporting Documents

Missing documentation causes 40% of all ITIN rejections. The IRS requires specific documents to prove identity and foreign status. A valid passport is the only single document that satisfies both requirements. Without a passport, you need 2 documents from the IRS approved list.

Common document mistakes:

• Submitting only 1 document when 2 are required (no passport)
• Submitting notarized copies instead of certified copies from the issuing agency
• Forgetting to include the tax return with reason code 6a
• Not including English translations for non-English documents

Reason 2: Wrong Reason Code on Line 6

Selecting the wrong reason code on Form W-7 Line 6 causes 25% of rejections. Each reason code (6a through 6g) requires different supporting documentation. Checking the wrong box means your documentation does not match.

• Checking 6a without attaching a tax return
• Checking 6b (treaty benefit) without specifying the treaty country and article
• Checking multiple boxes (only one is allowed)
• Leaving Line 6 completely blank

Reason 3: Expired Identification Documents

Submitting expired identification documents causes 15% of ITIN rejections. The IRS requires all documents to be current (not expired) at the time of submission. This applies to passports, national IDs, driver's licenses, and all other accepted documents.

Reason 4: Name Mismatch Between Form W-7 and Documents

Name discrepancies between your Form W-7 and your identification documents cause 10% of rejections. The IRS cross-references your Line 1a name against your passport, tax return, and other documents. Any difference triggers a rejection.

• Using a nickname instead of your legal name (“Mike” vs “Michael”)
• Omitting a middle name that appears on your passport
• Reversing first and last name order
• Using non-Latin characters instead of the romanized version

Reason 5: Missing Tax Return When Using Reason Code 6a

If you check reason code 6a (“Nonresident alien filing a US federal tax return”), you must attach your completed tax return to Form W-7. Forgetting the tax return is one of the most common and easily preventable mistakes.

Reason 6: Applicant Is Eligible for a Social Security Number

The IRS rejects ITIN applications from individuals who are eligible for an SSN. ITINs are specifically for people who cannot obtain an SSN. If you are authorized to work in the US (H-1B, L-1, O-1 visa holders, green card holders, or US citizens), you must apply for an SSN instead.

Reason 7: Incorrect Date Format on Line 3a

Using the wrong date format on Line 3a (date of birth) causes rejections, especially for international applicants. The IRS requires the US date format: MM/DD/YYYY. Many countries use DD/MM/YYYY, which reverses the month and day.

Reason 8: Missing Signature on Form W-7

An unsigned Form W-7 is automatically rejected. The signature section is on page 2 and requires a handwritten signature and date. Electronic signatures are not accepted on Form W-7.

Reason 9: Duplicate ITIN Application

The IRS rejects applications from individuals who already have an active ITIN. Each person can only have one ITIN. If you forgot your existing ITIN and applied for a new one, the IRS rejects the second application.

Reason 10: Tax Return Errors or Inconsistencies

If the tax return attached to your W-7 has significant errors, the IRS may reject both the W-7 and the return. Inconsistencies between the W-7 and the return (different names, addresses, or filing status) also trigger rejections.

How Do You Prevent ITIN Application Rejections?

Follow these 6 steps to minimize rejection risk.

1. Use a valid passport. A passport is the only single document that proves both identity and foreign status. It eliminates the need for 2 documents.
2. Use a Certifying Acceptance Agent. CAA-submitted applications have rejection rates below 5% compared to 20% for self-submitted applications. Our CAA service starts at $297.
3. Double-check every field. Verify name spelling, date format (MM/DD/YYYY), country names, and reason code before mailing.
4. Check document expiration dates. Every document must be current. Passports, national IDs, and driver's licenses must not be expired.
5. Include all required items. Form W-7 + tax return (for code 6a) + identification documents + any required supporting documents in one package.
6. Sign the form. Handwritten signature on page 2. Date it. An unsigned W-7 is rejected without review.

How Do You Reapply After an ITIN Rejection?

If your application was rejected, you have 2 reapplication paths.

Within 45 Days: Respond to the Rejection Letter

If you respond within 45 days of the rejection letter date, submit only the corrected documents or information. You do not need to resubmit the entire W-7 package. Follow the instructions in the rejection letter exactly.

After 45 Days: New Complete Application

After the 45-day window, submit a brand new W-7 package: new Form W-7, new tax return, and all supporting documents. Address the original rejection reason in your new submission. Include a cover letter referencing the prior rejection and explaining the correction made.