Form W-7 is the IRS application for an Individual Taxpayer Identification Number — the 9-digit tax ID (format 9XX-XX-XXXX, always starting with 9) for people with U.S. tax obligations who cannot get an SSN. Three things decide whether your W-7 is approved: checking the right reason box (a through h), submitting acceptable identity documents (a valid passport, or two of 13 alternatives), and attaching the form to a federal tax return unless one of five exceptions applies. Get those three right and approval is routine; miss any one and you join the rejection pile.
This is a line-by-line walkthrough. For background on what the number is and who needs it, read what is an ITIN number first.
Before You Start: What to Gather
| Item | Details |
|---|---|
| The current Form W-7 | Download from irs.gov — old revisions get rejected |
| Identity documents | Valid passport (standalone), or 2 of the 13 acceptable documents; originals or certified copies from the issuing agency only |
| Completed federal tax return | e.g., Form 1040-NR — required unless you claim an exception |
| Exception documentation | If applicable: treaty statement, bank letter, mortgage interest paperwork |
| Your complete foreign address | Line 3 is mandatory |
| Visa details, if you have a U.S. visa | Number, type, expiration date |
| Foreign tax ID number, if your country issues one | Goes on line 6b |
Do not photocopy and notarize documents — notarized copies are not accepted. Only originals or copies certified by the issuing agency qualify.
Application Type: New or Renewal
The first checkbox on the form asks whether you are applying for a new ITIN or renewing an existing one. Renewals apply when your ITIN expired — which happens automatically when the ITIN is not used on a U.S. federal return for 3 consecutive tax years (it expires December 31 of that third year). Renewal uses the same form with the "Renew an Existing ITIN" box checked; the full process is covered in ITIN renewal: when and how.
The Reason Boxes (a-h) Explained
The reason box tells the IRS why you are legally entitled to an ITIN. Checking the wrong one — or none — is a top rejection cause.
| Box | Who it applies to |
|---|---|
| a | Nonresident alien required to get an ITIN to claim a tax treaty benefit |
| b | Nonresident alien filing a U.S. federal tax return (the most common box) |
| c | U.S. resident alien (by days of presence) filing a U.S. return |
| d | Dependent of a U.S. citizen or resident alien |
| e | Spouse of a U.S. citizen or resident alien |
| f | Nonresident alien student, professor, or researcher filing a return or claiming an exception |
| g | Dependent or spouse of a nonresident alien holding a U.S. visa |
| h | Other — used together with one of the five W-7 exceptions; you must write the exception number |
You can check box a together with box f or h where treaty claims overlap. If you check d or e, you must also enter the U.S. citizen's or resident's name and SSN. If you check h, write the specific exception (for example, "Exception 1(d) — bank interest reporting") on the dotted line.
Line-by-Line Walkthrough
Lines 1a-1b: Name and birth name
Line 1a is your legal name exactly as it appears on your identity documents. Line 1b is your name at birth, only if different (for example, a pre-marriage surname). The name on 1a must match the name on your attached tax return character for character — mismatches generate CP566 letters.
Line 2: U.S. mailing address (if any)
Where the IRS will send your CP565 notice and return your documents. If you have no U.S. address, your foreign address on line 3 serves as the mailing address.
Line 3: Foreign address — required
Your complete address in your country of residence: street, city, province or state, postal code, and country. This line cannot be blank, even if you currently live in the U.S. If you no longer maintain a foreign residence, enter the foreign country where you last resided. A blank line 3 is one of the most common avoidable rejections.
Line 4: Birth information
Date of birth (MM/DD/YYYY) and country of birth. The date must match your identity documents.
Line 5: Gender
Check male or female as shown on your documents.
Line 6a: Country of citizenship
If you hold dual citizenship, list both countries.
Line 6b: Foreign tax identification number
The tax ID your home country issued you, if it issues one. Not all countries do — leave blank if yours does not.
Line 6c: Visa information
If you hold a U.S. visa, enter the type (for example, B-2, F-1), number, and expiration date. No visa? Leave it blank — a visa is not required for an ITIN.
Line 6d: Identity document details
Check which document you are submitting (passport, driver's license, etc.) and enter the issuing country or state, document number, expiration date, and the date you entered the U.S. (write "never entered" if you have not). A valid passport is the only document that works alone; otherwise list two of the 13 acceptable documents — the full list with the standalone passport rule is in the fast ITIN application guide.
Lines 6e-6f: Previous ITIN or IRS number
If you ever held an ITIN or IRS-issued temporary number, check yes and enter it. This matters for renewals and prevents duplicate assignments.
Line 6g: College or company (box f filers)
Students, professors, and researchers enter the institution name, city, state, and length of stay.
Signature block
The applicant signs and dates. Rules for who else may sign:
| Applicant | Who signs |
|---|---|
| Adult (18+) | The applicant; or an authorized agent with a power of attorney attached |
| Dependent under 18 | The applicant if able; otherwise a parent or court-appointed guardian, who writes their relationship to the applicant |
| Dependent 18+ unable to sign | Court-appointed guardian or power-of-attorney holder, with proof attached |
An unsigned form, or a form signed by someone without documented authority, is returned unprocessed.
Attaching the Federal Return
Unless you qualify for an exception, the W-7 must be stapled to the front of a completed, signed federal tax return. You do not mail the return to the normal filing address — the whole package goes to the ITIN unit (next section). Leave the SSN/ITIN field on the return blank; the IRS fills in the new ITIN after assignment and then processes the return. Because the W-7 and return travel together, the return is considered filed on time if the package is postmarked by the deadline.
Where to Send It: Three Routes
- Mail the W-7, return, and original documents (or certified copies) to: Internal Revenue Service, ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342. Your originals travel by post both directions.
- Certified Acceptance Agent (CAA). A CAA verifies your identity documents, attaches Form W-7 (COA) Certificate of Accuracy in place of your originals, and submits the package — your passport never leaves your hands. itin.net is an IRS-Certified Acceptance Agent: preparation and verification take 5-10 business days, $497 for a new application, $397 for a renewal, with a 100% money-back guarantee.
- IRS Taxpayer Assistance Center (TAC). Book an appointment at 844-545-5640. Staff verify documents in person and return them on the spot. Note: TACs do not issue ITINs same-day — standard processing still applies.
After You File: CP565, CP566, CP567
| Notice | Meaning | What to do |
|---|---|---|
| CP565 | ITIN assigned | Save the letter; use the ITIN on all future returns |
| CP566 | More information needed | Respond within 45 days with exactly what is requested |
| CP567 | Application rejected | Identify the cause, fix it, and reapply with a new W-7 |
Expect a notice in about 7 weeks, or 9-11 weeks during peak season (January 15-April 30) or when applying from abroad. After 7 weeks with no letter, call 1-800-829-1040 (U.S.) or +1-267-941-1000 (international) — there is no online tracker. Full guidance in how to track your W-7 application and how long an ITIN takes.
The Mistakes That Get W-7s Rejected
- No tax return attached and no exception claimed — the number-one rejection.
- Expired documents, or notarized copies instead of agency-certified copies.
- Name mismatch between line 1a, the tax return, and identity documents.
- Reason box left blank or inconsistent with the rest of the application (e.g., box b checked but no return attached).
- Missing foreign address on line 3.
- Wrong signature — unsigned forms, or a relative signing for an adult without a power of attorney.
- Claiming an exception without the required supporting documents (e.g., Exception 1 without a bank letter).
- Using an outdated W-7 revision downloaded from a third-party site.
Each mistake costs at minimum a CP566 cycle (45-day response window plus reprocessing) and at worst a CP567 restart — months, not days. This pre-submission review is the core of what a CAA does.
One scope note: Form W-7 and the ITIN it produces are for U.S. tax administration only. An ITIN does NOT authorize you to work in the United States, does NOT confer or change immigration status, and does NOT entitle the holder to Social Security benefits. If you are deciding between tax IDs, see EIN vs ITIN vs SSN.
Frequently Asked Questions
What is IRS Form W-7 used for?
Form W-7 is the application for an IRS Individual Taxpayer Identification Number (ITIN), a 9-digit tax ID beginning with 9 (format 9XX-XX-XXXX) for people who need to meet U.S. tax obligations but are not eligible for a Social Security Number.
Which reason box should I check on Form W-7?
Box b is the most common, for nonresident aliens filing a U.S. return. Box a is for treaty benefits, c for U.S. resident aliens, d and e for dependents and spouses of U.S. citizens or residents, f for nonresident students and researchers, g for dependents or spouses of nonresident visa holders, and h for exception-based applications filed without a return.
Does Form W-7 have to be attached to a tax return?
Yes, in most cases the W-7 must be attached to a completed federal tax return. The only way around this is qualifying for one of the five W-7 exceptions, such as treaty benefits or third-party reporting of bank interest or mortgage interest.
Where do I mail Form W-7?
Internal Revenue Service, ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342. Alternatively, submit through a Certified Acceptance Agent, or book an IRS Taxpayer Assistance Center appointment at 844-545-5640 to have documents verified in person.
Is the foreign address on Form W-7 required?
Yes. Line 3 requires your complete foreign (non-U.S.) address. Leaving it blank is a common rejection reason, even for applicants currently living in the United States. If you no longer keep a foreign residence, enter the foreign country where you last lived.
Who signs Form W-7 for a child?
A parent can sign for a dependent under 18 and must enter their relationship to the applicant. A court-appointed guardian or a person holding a power of attorney can also sign, with proof of authority attached.
Can I file Form W-7 without my passport?
Yes, but you then need two of the 13 acceptable documents — such as a national ID card plus a birth certificate — as originals or certified copies from the issuing agency. A valid passport is the only document accepted on its own.
How long after filing Form W-7 will I hear from the IRS?
Expect notice CP565 (ITIN assigned), CP566 (more information needed), or CP567 (rejected) in about 7 weeks, or 9-11 weeks during peak season (January 15 to April 30) or when filing from abroad.
What happens if I get a CP566 notice?
The IRS needs more information before it can assign your ITIN. Respond within 45 days with exactly what the notice requests, or the application is treated as abandoned and you must start over with a new W-7.
Do I use Form W-7 to renew an expired ITIN?
Yes. Check the "Renew an Existing ITIN" box at the top of the form. An ITIN expires on December 31 of the third consecutive tax year it goes unused on a federal return.
Does getting an ITIN through Form W-7 change my immigration status?
No. An ITIN is for U.S. tax administration only. It does not confer or change immigration status, does not authorize work in the United States, and does not entitle the holder to Social Security benefits.
