Updated May 2026 | Source: IRS Form W-7 Instructions | IRC Section 6109
W-7 Form Guide 2026: How to Fill Out All 7 Sections
Form W-7 is a 2-page IRS form with 7 sections and 8 reason codes. Filling it out correctly the first time prevents rejections that add 4 to 8 weeks to your timeline. The IRS rejects thousands of W-7 forms each year for avoidable errors. This guide walks through every section, explains what the IRS expects in each field, and identifies the 7 most common mistakes. For the full guide with field-by-field examples, visit the complete W-7 form guide.
Which of the 8 Reason Codes Should You Select?
The top of Form W-7 requires you to check 1 box (A through H) indicating why you need an ITIN. This is the most important field on the form. Your reason code determines which supporting documents you attach and whether you need a tax return. Use our eligibility checker to identify your correct reason code.
Primary Reason Codes (A, B, C)
Box A: Non-resident alien required to file a US tax return
The most common selection. You earned US-source income and must file Form 1040-NR. Applies to freelancers, Amazon sellers, and real estate investors.
Box B: US resident alien filing a tax return
You meet the substantial presence test (183+ days over 3 years) but cannot get an SSN. Attach Form 1040.
Box C: Dependent of a US citizen or resident alien
You are claimed as a dependent on someone else's return. The primary filer's name and SSN/ITIN must be listed. See our dependent and spouse guide.
Additional Reason Codes (D, E, F, G, H)
Box D: Dependent of a non-resident visa holder
Applies to dependents of F-1, H-1B, J-1, and other non-immigrant visa holders. Include the visa holder's information. Relevant for H-4 visa holders.
Box E: Spouse of a non-resident visa holder
Similar to Box D but for spouses. Include the primary visa holder's details and visa classification.
Box F: Non-resident alien electing to file jointly
You are a non-resident alien spouse electing to file a joint return with your US citizen or resident alien spouse under IRC Section 6013(g).
Box G: Unauthorized alien claiming treaty benefits
Rare. Used when claiming income tax treaty benefits without other filing obligations.
Box H: Other
Covers tax treaty benefits, third-party withholding, and mortgage interest reporting. Write a specific explanation in the space provided.
How Do You Fill Out the Name and Personal Information Section?
Lines 1 through 6 collect your personal details. The IRS cross-references every field against your identity documents. Name mismatches are the number 1 cause of W-7 rejections.
Line 1a: Legal Name
Enter your full legal name exactly as it appears on your passport or primary identity document. Include your middle name. Do not use nicknames or abbreviations. The IRS matches this field character for character against your documents.
Line 1b: Name at Birth
Complete only if your name changed since birth (marriage, legal name change, adoption). Leave blank if your name has not changed.
Lines 2-3: Mailing and Foreign Address
Line 2: The IRS sends your ITIN assignment letter (CP565) to this address. Use a reliable address. Include your full international address with country if outside the US. Line 3: Enter your permanent foreign address if it differs from your mailing address. This confirms your foreign status.
Lines 4-6: Date of Birth, Citizenship, and Visa Information
Line 4: Enter date of birth in MM/DD/YYYY format. Must match your identity documents. Line 5: Enter your country of citizenship. If dual citizenship, list both countries. Lines 6a-6g: Enter US visa type, number, and date of entry. If you have never entered the US, check the appropriate box.
What Are the Signature Rules for Form W-7?
The signature section at the bottom of Form W-7 is where many applicants make preventable errors. 3 rules apply:
Adult Applicants (18+)
You must sign the form yourself. No one else can sign on your behalf. Enter the current date and a phone number where the IRS can reach you during US business hours (Eastern Time). International phone numbers are accepted.
Minor Dependents (Under 18)
A parent or court-appointed guardian signs on the child's behalf. Print the parent's name and indicate the relationship (parent or legal guardian). The parent's SSN or ITIN is also required.
CAA/Acceptance Agent Section
If a Certifying Acceptance Agent submits on your behalf, they complete and sign the designated agent section. The applicant still provides their own signature above.
What Are the 7 Most Common W-7 Mistakes That Cause Rejections?
The IRS rejects thousands of W-7 forms each year. These 7 errors account for the majority of rejections. Each rejection adds 4 to 8 weeks to your timeline:
Errors That Trigger Automatic Rejection
- Name mismatch. Name on W-7 does not exactly match identity documents. Even missing a middle name causes rejection.
- Wrong or missing reason code. Failing to check Box A through H, or checking the wrong box for your situation.
- Missing tax return. Forgetting to attach the federal tax return when required (Reasons A and B).
- Outdated form version. Using a prior revision of Form W-7 instead of the current version from IRS.gov.
- Blank required fields. Leaving date of birth, country of citizenship, or mailing address empty.
- Notarized copies instead of certified copies. The IRS accepts only originals or certified copies from the issuing agency. Review the document checklist for accepted document types.
- Missing signature. Unsigned forms are returned without processing.
How to Prevent Rejections
A professional CAA review catches all 7 errors before submission. At itin.so, the ITIN service ($297) include complete W-7 review, document verification, and tax return preparation. Check our cost guide for a full comparison.
Where Do You Submit Completed Form W-7?
3 submission methods exist. Each has different document requirements and timelines:
Option 1: Through a Certifying Acceptance Agent (Recommended)
A CAA verifies your documents locally and submits a Certificate of Accuracy (Form 13551) to the IRS. You keep your passport and originals. Preparation takes 2 to 10 business days depending on service tier. IRS processing adds 6 to 11 weeks. Learn more about how CAAs work.
Option 2: Mail to IRS Austin Processing Center
Mail to: Internal Revenue Service, ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342. Include original documents or certified copies. The IRS returns originals within 60 days. Add 1 to 2 weeks for mail transit plus 6 to 11 weeks for IRS processing.
Option 3: In-Person at an IRS Taxpayer Assistance Center
Visit 1 of 13 IRS TAC locations. An agent reviews your documents same-day and you keep your originals. Call 1-844-545-5640 for appointments. IRS processing still takes 6 to 11 weeks. Check our processing time calculator for total timeline estimates.
Frequently Asked Questions About Form W-7
Skip the complexity. Our CAA team fills out Form W-7 correctly the first time. $297.
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