Updated May 2026
IRS Form W-7: Complete ITIN Application Guide 2026
IRS Form W-7 is the 2-page application for an Individual Taxpayer Identification Number. The form has 3 sections: personal information, reason for applying (8 boxes, a through h), and supporting documents plus signature. Errors on Form W-7 are the number 1 reason the IRS rejects ITIN applications, with name mismatches, wrong reason boxes, and missing signatures accounting for the majority of rejections. This guide walks through every line, highlights the 6 most common mistakes, and explains all 3 submission methods.
What Is IRS Form W-7?
Form W-7, officially titled “Application for IRS Individual Taxpayer Identification Number,” is a free 2-page IRS form required to obtain or renew an ITIN under IRC Section 6109. The form collects your personal information, your reason for applying, and details about your identity documents. The IRS charges $0 to process Form W-7.
You submit Form W-7 along with 1 of 13 accepted identity documents and, in most cases, a completed federal tax return. The IRS uses the information to verify your identity, confirm your eligibility, and assign your 9-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 rejects your W-7. Learn about the differences in our ITIN vs SSN comparison.
How Do You Complete Section 1: Name, Address, and Birth Information?
Section 1 occupies the top half of page 1. Every entry must match your supporting documents exactly. Here are the key fields:
Line 1a: Legal Name
Enter your full legal name as it appears on your passport or primary identity document. Include first name, middle name (if any), and last name. Do not use nicknames or abbreviations. If your name has changed since your documents were issued, attach legal proof of the name change (marriage certificate, court order).
Line 2: Mailing Address
Provide the address where you want the IRS to send your CP565 notice (ITIN assignment letter). This can be a US or foreign address. Double-check this address because the IRS mails your ITIN confirmation here. An incorrect address means you never receive your ITIN notice.
Lines 3-4: Birth Information
Enter your date of birth (MM/DD/YYYY format), city and state of birth, and country of birth. Your birth country helps verify your foreign status. If born in the US but not a US citizen (rare cases), attach supporting documentation.
Lines 5-6: Foreign Address and Citizenship
Provide your foreign (non-US) address and country of citizenship. If you hold citizenship in multiple countries, list all of them. Include your foreign tax identification number if you have one. This is separate from Line 2 (mailing address).
How Do You Choose the Right Reason-for-Applying Box?
Lines 1a through 1h list 8 IRS-approved reasons for applying. Check exactly 1 box. Checking the wrong box or multiple boxes triggers a rejection. This table shows all 8 options:
| Box | Reason | Tax Return Required? |
|---|---|---|
| a | Non-resident alien filing a US tax return | Yes (1040-NR) |
| b | Resident alien filing a US tax return | Yes (1040) |
| c | Dependent of a US citizen/resident | No (exception) |
| d | Spouse of a US citizen/resident | No (exception) |
| e | Non-resident alien claiming tax treaty benefit | No |
| f | Non-resident alien student, professor, or researcher | Depends on income |
| g | Dependent/spouse of non-resident visa holder | No (exception) |
| h | Other (third-party withholding, mortgage interest) | No |
If attaching a tax return, write “ITIN Application” across the top of the return. The IRS processes your tax return and W-7 together. For more on filing, see our ITIN tax return guide.
How Do You Complete Section 3: Documents and Signature?
Document Checklist
Check the box next to each document type you are submitting. The IRS accepts 13 documents total. A passport alone satisfies both identity and foreign status. Without a passport, you need 2 documents. See the full list in our ITIN documents guide.
Signature Line
Sign with ink (not digitally) and include the date. For applicants under 18, a parent or legal guardian signs. Unsigned forms are rejected automatically. If a delegate or authorized representative submits on your behalf, they complete the Delegate section at the bottom of page 2.
CAA Section
If you use a Certifying Acceptance Agent, the CAA fills in their PTIN (Preparer Tax Identification Number), CAA number, and EIN in the delegate section. The CAA also attaches a Certificate of Accuracy verifying your identity documents.
What Are the 6 Most Common Form W-7 Mistakes?
The IRS rejects thousands of ITIN applications each year. These 6 errors cause the majority of rejections:
- Name mismatch. Your name on Form W-7 must exactly match your passport or primary ID. Even 1 letter difference in spelling triggers a rejection.
- Wrong reason-for-applying box. Checking box a when you should check box d (or vice versa) is a frequent error. Read each option and select only 1.
- Missing signature. The IRS automatically rejects unsigned forms. Sign with ink and include the date.
- No tax return attached. Unless you qualify for an exception (boxes c, d, e, g, h), you must attach a completed federal tax return.
- Expired documents. All identity documents must be current and unexpired at the time of submission.
- Sending photocopies. The IRS requires originals or certified copies from the issuing agency. Regular photocopies are rejected.
Where Do You Submit Your Completed Form W-7?
3 submission methods are available. Choose based on your location and whether you want to keep your original documents:
Method 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 of receiving your application.
Method 2: IRS Taxpayer Assistance Center
Apply in person at 1 of 13 designated IRS TAC locations. Staff verify your documents on the spot, so you keep your originals. TAC visits require an appointment. Locations are limited to major US cities.
Method 3: 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. The CAA's review eliminates the errors that cause rejections. itin.so serves applicants in 150+ countries as an IRS-authorized CAA.
What Are the Best Tips for Fast W-7 Approval?
- Use your passport. It proves both identity and foreign status with 1 document, reducing document-related issues.
- Compare every letter of your name. Check your Form W-7 entries letter by letter against your identity document.
- Sign and date the form. 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.
- Submit off-peak (May-December). Processing is 2-3 weeks faster outside of tax season.
- Use a CAA. Professional review catches errors before your application reaches the IRS, saving 4-8 weeks of correction time. See our service comparison.
Frequently Asked Questions About Form W-7
Need help completing Form W-7? Our CAA team prepares your application and submits it to the IRS.
Start Your ITIN Application - $297Need to renew instead? See our ITIN renewal guide or review the full ITIN requirements.