Updated April 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 Standard service ($197) and Express service ($297) both 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

How do I fill out Form W-7 for an ITIN in 2026?

Form W-7 is a 2-page IRS form with 7 sections. Start by selecting your reason code (Box A through H), then enter your legal name exactly as it appears on your passport, fill in your mailing and foreign addresses, enter your date of birth in MM/DD/YYYY format, list your country of citizenship, complete visa/entry information if applicable, and sign and date the form. Attach your federal tax return and identity documents.

What is the most common mistake on Form W-7?

Name mismatches cause the highest number of W-7 rejections. Your name on Form W-7 must match your passport or identity document character for character, including middle names, suffixes, and accented letters. The IRS cross-references Line 1a against your supporting documents. Even a missing middle name or abbreviated first name triggers automatic rejection.

Do I need to attach a tax return to Form W-7?

Yes, in most cases. Applicants filing under Reason A (non-resident alien) attach Form 1040-NR. Reason B (resident alien) applicants attach Form 1040. 3 exceptions exist: dependents claimed on another person's return (Reason C/D), spouses filing jointly under Reason F, and certain treaty-based claims under Reason H that do not require a personal tax return.

Which of the 8 reason codes should I select on Form W-7?

Select the code matching your tax situation. Reason A (most common): non-resident aliens filing a US tax return. Reason B: resident aliens. Reason C: dependents of US citizens. Reason D: dependents of visa holders. Reason E: spouses of non-resident visa holders. Reason F: non-residents electing joint filing. Reason G: treaty benefits. Reason H: other situations including withholding.

Can someone else sign Form W-7 on my behalf?

A parent or court-appointed guardian can sign Form W-7 for a dependent under 18. The parent must print their name and indicate the relationship (parent/guardian). Adult applicants aged 18 and over must sign the form themselves. A Certifying Acceptance Agent prepares the form but the applicant provides their own signature.

What version of Form W-7 should I use in 2026?

Use the most recent revision of Form W-7 available on IRS.gov. The current revision date appears in the top-left corner of the form. The IRS rejects applications submitted on outdated versions. Download the current form directly from irs.gov/pub/irs-pdf/fw7.pdf and the instructions from irs.gov/pub/irs-pdf/iw7.pdf.

How long does it take the IRS to process Form W-7?

The IRS processes Form W-7 in 6 to 11 weeks after receiving a complete application. During peak tax season (January through April), processing takes 11+ weeks. Off-peak submissions (May through December) process in 6 to 8 weeks. Each error that requires correction adds 4 to 8 weeks. Use our processing time calculator for a personalized estimate.

What documents do I attach to Form W-7?

Attach your federal tax return (Form 1040 or 1040-NR) and identity/foreign status documents. The IRS accepts 13 identity documents. A valid passport is the only standalone document that proves both identity and foreign status. Without a passport, attach at least 2 documents covering both requirements. All documents must be originals, certified copies, or CAA-certified.

Where do I mail completed Form W-7?

Mail Form W-7 to: Internal Revenue Service, ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342. Use trackable shipping (USPS Priority Mail, FedEx, or UPS). If applying through a CAA, the agent submits the application to the IRS on your behalf with a Certificate of Accuracy replacing your original documents.

Can I submit Form W-7 online?

No. The IRS does not accept Form W-7 electronically. You must submit a paper form by mail, through a Certifying Acceptance Agent, or in person at 1 of 13 IRS Taxpayer Assistance Centers. The IRS has not announced plans for online W-7 submission. Using a CAA like itin.so is the closest option to a digital experience.

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