IRS Form W-7: Complete ITIN Application Guide 2026
IRS Form W-7 is the official application for an Individual Taxpayer Identification Number. The ITIN W-7 form collects your personal information, your reason for applying, and details about the documents you are submitting. Errors on this form are the number one reason the IRS rejects ITIN applications. This guide walks you through every section line by line, highlights the most common mistakes, and explains how to submit your completed form for the fastest possible processing.
What Is Form W-7?
Form W-7, officially titled “Application for IRS Individual Taxpayer Identification Number,” is a two-page IRS form that you must file to obtain an ITIN. The form is free to download from the IRS website and does not require a fee to submit.
You submit Form W-7 along with your identity and foreign status documents and, in most cases, a completed federal tax return. The IRS uses the information on this form to verify your identity, confirm your eligibility, and assign your nine-digit ITIN.
Before filling out the form, confirm that you meet all ITIN requirements. If you are eligible for a Social Security Number, the IRS will reject your W-7 application.
Section 1: Name, Address, and Birth Information
The first section of Form W-7 collects your personal details. Every entry must match your supporting documents exactly.
Line 1a: Name
Enter your full legal name as it appears on your passport or primary identity document. Include your first name, middle name (if any), and last name. Do not use nicknames or abbreviated versions. If your name has changed since your documents were issued, attach legal proof of the name change.
Line 2: Mailing Address
Provide the US mailing address where you want the IRS to send your ITIN assignment notice (CP565). If you do not have a US address, you may use a foreign address. Double-check this address carefully because the IRS mails your ITIN confirmation here.
Lines 3 and 4: Birth Information
Enter your date of birth, city and state/province of birth, and country of birth. Your birth country determines part of your foreign status verification. If you were born in the US but are not a US citizen (rare cases involving renunciation), attach supporting documentation.
Lines 5 and 6: Foreign Address and Country Information
Provide your foreign (non-US) address and your country of citizenship. If you hold citizenship in multiple countries, list all of them. Also indicate your foreign tax identification number if you have one.
Section 2: Reason for Applying
Line 1a through 1h lists the IRS-approved reasons for applying for an ITIN. You must check exactly one box. Checking the wrong box or checking multiple boxes will delay or reject your application.
| Box | Reason | Tax Return Required? |
|---|---|---|
| a | Non-resident alien filing a US tax return | Yes |
| b | Resident alien filing a US tax return | Yes |
| c | Dependent of a US citizen/resident | Exception applies |
| d | Spouse of a US citizen/resident | Exception applies |
| e | Non-resident alien claiming tax treaty benefit | No |
| f | Non-resident alien student, professor, or researcher | Varies |
| g | Dependent/spouse of non-resident visa holder | Exception applies |
| h | Other (third-party withholding, etc.) | No |
If you are filing a tax return, attach your completed return (Form 1040, 1040-NR, or 1040-SR) directly to your Form W-7. Write “ITIN Application” across the top of the return. The IRS processes your tax return and ITIN application together.
Section 3: Supporting Documents and Signature
The final section of Form W-7 asks you to list the documents you are submitting and to sign the form. Check the box next to each document type you are including. If you are using a Certifying Acceptance Agent, the CAA completes part of this section and attaches their Certificate of Accuracy.
The signature line requires your handwritten signature and the date. For applicants under 18, a parent or legal guardian signs on their behalf. An unsigned form is automatically rejected by the IRS.
If a delegate or authorized representative is submitting on your behalf, they must complete the “Delegate” section at the bottom of page 2. A Certifying Acceptance Agent fills in their PTIN (Preparer Tax Identification Number) and CAA number in this section.
Common Form W-7 Mistakes That Cause Rejections
The IRS rejects thousands of ITIN applications each year due to preventable errors on Form W-7. Here are the most common mistakes and how to avoid them:
- Name mismatch. Your name on Form W-7 must exactly match your passport or primary identity document, including middle names and suffixes. Even a small spelling difference triggers a rejection.
- Wrong reason-for-applying box. Checking box “a” when you should check box “d” (or vice versa) is a common error. Read each option carefully and select only one.
- Missing signature. The IRS automatically rejects unsigned forms. Sign with a pen (not digitally) and include the date.
- No tax return attached. Unless you qualify for a specific exception, you must attach a completed federal tax return. Missing the return is one of the top rejection reasons.
- Expired documents. All identity documents must be current and unexpired at the time of submission.
- Incomplete address. Provide a complete mailing address where you can receive mail. The IRS sends your ITIN confirmation to this address.
Where to Submit Your Completed Form W-7
You have three options for submitting your Form W-7:
1. Mail to the IRS
Send your completed Form W-7, supporting documents (originals or certified copies), and tax return to: IRS, ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342. The IRS returns original documents within 60 days.
2. Visit an IRS Taxpayer Assistance Center (TAC)
You can apply in person at designated IRS offices. Staff verify your documents on the spot, so you keep your originals. However, TAC locations are limited and require an appointment.
3. Submit through a Certifying Acceptance Agent
A CAA verifies your documents, prepares your Form W-7, and submits your complete application to the IRS. You keep your original documents, and the CAA's review reduces the risk of errors. Learn more about how to use a Certifying Acceptance Agent.
Tips for Fast ITIN Approval
Follow these tips to maximize your chances of first-time approval:
- Use your passport. It proves both identity and foreign status with a single document, reducing the chance of document-related issues.
- Double-check every name spelling. Compare your Form W-7 entries letter by letter against your identity documents.
- Sign and date the form. This sounds obvious, but unsigned forms are rejected thousands of times per year.
- Attach the correct tax return. Make sure the tax year matches and write “ITIN Application” at the top.
- Work with a CAA. Professional review catches errors before your application reaches the IRS, saving weeks of correction time.
How to Fill Out IRS Form W-7 Step by Step
Frequently Asked Questions About Form W-7
Need help completing Form W-7? Our CAA team handles everything.
Start Your ITIN ApplicationWant to learn more first? Review the full ITIN requirements.