Form W-7 is the IRS application used to request a new Individual Taxpayer Identification Number (ITIN) or renew an existing ITIN. It is designed for individuals who need a U.S. taxpayer identification number for a federal tax purpose but do not have, and are not eligible to obtain, a Social Security number (SSN). The IRS currently uses the December 2024 revision of Form W-7.
The form itself is only one page, but a valid ITIN application usually depends on three pieces fitting together: the reason stated on Form W-7, the federal tax return or IRS exception that supports that reason, and documentation proving identity and foreign status. A mismatch between those pieces can delay processing even when the form appears complete.
Form W-7 Starts With SSN Eligibility
Form W-7 is not an alternative taxpayer number for someone who can obtain an SSN. The form states that it should not be submitted by a person who already has an SSN or is eligible to get one. The ITIN system is for federal tax administration when an SSN is unavailable because the individual is not eligible for one.
This distinction matters for foreign students, researchers, workers, spouses, dependents, investors, and other non-U.S. persons because immigration classification, work authorization, and federal tax residency do not answer the SSN question in the same way. A person can be a resident alien for federal tax purposes without being a lawful permanent resident, while another person can remain a nonresident alien for tax purposes and still have work authorization that makes an SSN the appropriate number.
W-7 boundary: lacking an SSN does not, by itself, create a basis for an ITIN. The application also needs a federal tax purpose recognized by the IRS.
New ITIN or Renewal Comes First
The upper-right corner of Form W-7 asks for one application type: Apply for a new ITIN or Renew an existing ITIN. A first-time applicant uses the first option. A person who previously received an ITIN and is renewing it uses the second.
A renewal is not completed merely by checking the renewal box. The IRS still requires a reason in the section labeled “Reason you’re submitting Form W-7.” The renewal applicant also answers line 6e and provides the previously assigned ITIN and the name under which it was issued on line 6f. If the legal name changed after the original ITIN assignment, documentation supporting the legal name change is required with the renewal package.
An expired ITIN generally does not need to be renewed solely because it appears on an information return. Renewal becomes relevant when the expired ITIN will be used again on a U.S. federal tax return. The separate rules governing when an ITIN expires are broader than the purpose of Form W-7 itself.
Choosing the Reason for Submitting Form W-7
The reason section is the center of the application. The IRS requires a selection even for a renewal. If more than one description appears relevant, the instructions direct the applicant to select the box that best explains why Form W-7 is being submitted.
| Box | Form W-7 Category | What the Selection Connects To |
|---|---|---|
| a | Nonresident alien required to get an ITIN to claim tax treaty benefit | A treaty-based federal tax purpose. Box h is also completed with the applicable exception information. |
| b | Nonresident alien filing a U.S. federal tax return | A federal return filed to report income or, in some cases, to claim a refund. |
| c | U.S. resident alien based on days present in the United States filing a U.S. federal tax return | Federal tax residency based on presence in the United States, not immigration terminology. |
| d | Dependent of U.S. citizen/resident alien | A dependent-related allowable federal tax benefit, together with required relationship and taxpayer information. |
| e | Spouse of U.S. citizen/resident alien | A qualifying federal tax purpose involving a spouse who is not eligible for an SSN. |
| f | Nonresident alien student, professor, or researcher filing a U.S. federal tax return or claiming an exception | Tax-return filing or a permitted exception connected with the applicant’s temporary student, teaching, or research activity. |
| g | Dependent/spouse of a nonresident alien holding a U.S. visa | The dependent or spouse category tied to a nonresident visa holder, subject to the tax-purpose rules in the instructions. |
| h | Other | A federal tax reason not described by boxes a through g, often with an exception designation and supporting evidence. |
Box a: Treaty Benefits Require More Than Treaty-Country Residence
Box a applies when a nonresident alien needs an ITIN to claim a U.S. income tax treaty benefit. Residence in a treaty country is not enough by itself. The application needs the treaty-based federal tax purpose and the documentation required by the relevant W-7 exception.
For this category, the Form W-7 instructions connect box a with box h. The dotted line for box h identifies the applicable Exception 1 or Exception 2 category, and the form also asks for the treaty country and treaty article number. The treaty country should be consistent with the foreign residence information reported on line 3.
Box b: Nonresident Alien Filing a Federal Return
Box b is the reason that directly corresponds to a nonresident alien filing a U.S. federal tax return. The IRS instructions include both a nonresident alien filing to report U.S. tax items and a nonresident alien filing a return only to obtain a refund.
Box b has a specific address consequence that is easy to miss: line 3 requires a complete foreign, non-U.S. address. If the applicant no longer maintains a permanent foreign residence, the instructions call for the complete address of the most recent residence in the country where the person permanently or normally resided.
Box c: “Resident Alien” Is a Federal Tax Classification
Box c uses the phrase “U.S. resident alien (based on days present in the United States).” That language is about federal tax residency. It is not a statement that the applicant is a lawful permanent resident for immigration purposes. Federal tax residency can arise under the substantial presence test even when the person does not hold a green card.
The day-counting rules can differ for categories such as certain students, teachers, trainees, and foreign-government-related individuals. The correct W-7 reason therefore depends on the applicant’s federal tax status for the relevant tax year rather than a casual use of the words resident or nonresident.
Boxes d and e: Dependents and Spouses Need an Actual Federal Tax Purpose
Marriage or family relationship alone does not establish ITIN eligibility. For box d, Form W-7 asks for the dependent’s relationship to the U.S. citizen or resident alien and the full name and SSN or ITIN of that taxpayer. The application may also require a date of entry and proof of U.S. residency, depending on the tax benefit and the dependent’s circumstances.
Box e asks for the identifying information of the U.S. citizen or resident alien spouse. The W-7 instructions contain rules tied to the federal return and the tax purpose for which the spouse’s ITIN is requested. Being the spouse of a U.S. citizen or resident alien does not make an ITIN automatic.
Box f: Students, Professors, and Researchers
Box f is designed for a nonresident alien student, professor, or researcher who is filing a U.S. federal tax return or claiming an allowed exception. The instructions tie this box to lines 6a, 6c, 6d, and 6g. Those fields cover citizenship, U.S. visa information, identification and entry information, and the educational institution or other applicable organization.
A student present in the United States on an F-1, J-1, or M-1 classification for study-related purposes and without employment may, in the circumstances described in the W-7 instructions, use a letter from a Designated School Official or Responsible Officer instead of an SSA denial letter. This is a document rule attached to the specific W-7 situation; it does not mean every international student needs an ITIN.
When box f is used with a treaty-based exception, box h is also completed with the applicable Exception 2 designation, along with the treaty country and article number where required.
Boxes g and h: Visa-Linked Family Applications and Other Reasons
Box g covers the dependent or spouse of a nonresident alien holding a U.S. visa. The instructions call for the relevant visa documentation and a U.S. entry date on line 6d where applicable. The tax benefit rules for spouses and dependents still control whether an ITIN can be issued.
Box h is not a catch-all that works without explanation. The reason must be described in detail and supported with the documents required for that reason. When an IRS exception is being used instead of attaching a federal tax return, the dotted line next to box h identifies the exception by number and, where applicable, its subsection and category.
When a Federal Tax Return Goes With Form W-7
For a first-time ITIN application, the usual package contains Form W-7, the original U.S. federal tax return for which the ITIN is needed, and the required supporting documents. Form W-7 is attached to the front of the return. If several people on one return are applying for ITINs, each applicant has a separate Form W-7 attached to that return.
The SSN field on the attached return is left blank for each person applying for an ITIN. The IRS processes the W-7 application, assigns the ITIN if the application is approved, associates the number with the return, and then forwards the return for normal processing.
A tax return is not attached when an applicant falls within one of the exceptions described in the W-7 instructions and supplies the documentation required for that exception. An exception is not created merely because filing a return would be inconvenient or because a third party asks for an ITIN.
| Exception | General IRS Category | Typical Documentation Context |
|---|---|---|
| 1 | Passive income, third-party withholding, or tax treaty benefits | Income or withholding relationships such as partnership, interest, rental, pension, annuity, or other covered passive income situations. |
| 2 | Other income | Certain treaty-related compensation, scholarship, fellowship, grant, or gambling income situations, plus specified scholarship or grant cases without a treaty claim. |
| 3 | Mortgage interest third-party reporting | A U.S. real-property mortgage that creates third-party mortgage-interest reporting. |
| 4 | Disposition of a U.S. real property interest | Specified FIRPTA withholding or reporting situations involving a foreign person’s disposition of U.S. real property. |
| 5 | Treasury Decision 9363 | A narrow reporting situation for a non-U.S. representative of a foreign corporation that needs an ITIN for the identified electronic filing requirement. |
The exception tables in the official instructions specify the documents that substitute for the attached return. Those documents are part of the eligibility evidence for the exception, not merely optional supporting material.
How Lines 1 Through 6g Fit Together
The line instructions tell applicants to enter “N/A” in sections of a line that do not apply rather than leaving sections blank. The entries should also agree with the supporting documents. Names, birth information, citizenship, visa data, document numbers, and previous ITIN information are cross-checked as parts of the same application.
Lines 1a and 1b: Legal Name and Name at Birth
Line 1a is the applicant’s legal name as shown on identifying documents and as it will appear on the federal tax return. The IRS establishes the ITIN under this name. A different name on the attached return can create a processing delay.
Line 1b is used when the name on the applicant’s birth certificate differs from line 1a. This distinction can matter after marriage, a court-ordered name change, or another lawful name change. A renewal submitted under a new legal name also needs documentation supporting the change.
Line 2: The Mailing Address Also Controls Document Return
Line 2 is the complete mailing address for the W-7 application. The IRS uses it to send the ITIN application notice and to return original supporting documents. That makes line 2 operationally different from a routine contact field.
If Form W-7 is submitted without a federal tax return, entering a new address on line 2 does not by itself update the IRS address used for other tax records. The W-7 instructions point to Form 8822 when a separate address change is needed.
Line 3: The Foreign Address
Line 3 records the complete foreign address in the country where the applicant permanently or normally resides. If that address is the same as the mailing address on line 2, it is still reported on line 3. The form does not permit a P.O. box as the foreign address.
If the applicant relocated to the United States and no longer has a permanent foreign residence, the instructions generally permit the country of the last foreign residence to be entered. Box b is different: a person using box b must provide the complete address of the most recent permanent or normal foreign residence.
For a treaty-benefit application, the treaty country must match the country reported on line 3. That link between the reason box and the foreign-address field is one reason the form should be read as a connected application rather than as unrelated blanks.
Lines 4 and 5: Birth Information
Line 4 asks for the date of birth in month/day/year format, country of birth, and an optional city and state or province of birth. Line 5 asks for the sex entry shown on the current form. Birth information should be consistent with the documents submitted to establish identity and foreign status.
Line 6a: Citizenship
Line 6a reports the applicant’s country or countries of citizenship. The IRS instructions call for the complete country name rather than an abbreviation. Dual citizens can report more than one country.
Line 6b: Foreign Tax Identification Number
Line 6b is not asking for the ITIN being requested. It asks for a tax identification number issued by the applicant’s country of residence for tax purposes, if that country has issued one. The exact name and format of a foreign TIN vary by country.
Line 6c: U.S. Nonimmigrant Visa Information
Line 6c is limited to U.S. nonimmigrant visa information. The field covers the visa classification, visa number, and expiration date. Applicants who possess I-20 or I-94 documentation are directed by the W-7 instructions to include copies where applicable.
This field should not be used to place unrelated immigration or foreign visa information on the tax form. Its purpose is to connect the W-7 application with the applicant’s U.S. nonimmigrant documentation when that information applies.
Line 6d: Identification Document and U.S. Entry Date
Line 6d identifies the first document being submitted and records the issuer, document number, expiration date, and date of entry into the United States. When more than one identification document is submitted, the first document is entered on line 6d and the required details for additional documents are placed on a separate sheet labeled with the applicant’s name and “Form W-7.”
The date of entry is the complete date the applicant entered the United States for the purpose connected with the ITIN request, when applicable. A person who has never entered the United States enters “Never entered the United States” on this line under the current instructions.
Lines 6e and 6f: Previous ITIN or IRSN
Line 6e asks whether the applicant previously received an ITIN or an Internal Revenue Service Number (IRSN). An IRSN is not an ITIN. It is an IRS-assigned number that can appear in correspondence when a return or payment was processed without a taxpayer identification number.
If an ITIN or IRSN was previously assigned, line 6f records the number and the name under which it was issued. For renewals, the previously assigned ITIN and original ITIN name are especially relevant because the IRS instructions identify missing line 6f information as a possible source of delay.
Line 6g: School, University, or Company Information
Line 6g is not a universal field. An applicant using reason f enters the name of the educational institution, its city and state, and the length of stay in the United States. The instructions also use line 6g for certain temporary business-purpose situations by requesting the company name, location, and length of stay.
Supporting Documents: Passport or a Document Combination
Every new or renewal W-7 application needs documentation establishing identity and foreign status. The documents must be current when the application is submitted and normally must be originals or copies certified by the original issuing agency. An ordinary photocopy does not meet the certified-copy rule.
A certified copy is an exact copy supplied and certified by the issuing agency, with that agency’s official stamped seal. This is different from assuming that any notarized copy is acceptable. The W-7 instructions contain narrow special rules for certain military-family applications, but notarization is not the general documentation standard.
A Valid Passport Can Usually Stand Alone
The IRS treats a valid passport as the only stand-alone document that can ordinarily prove both identity and foreign status. An original passport or a certified copy from the issuing agency can therefore replace the need for a two-document combination for those two purposes.
The passport rule does not erase other requirements created by the applicant’s category. Visa pages may be needed when a visa is required for the W-7 application, and certain dependent applicants need separate U.S. residency evidence when the passport does not contain a U.S. entry date.
Without a Valid Passport, the IRS Uses a Document Combination
The IRS currently recognizes 13 document types for W-7 identity and foreign-status purposes. Without a valid passport, the application generally uses two supporting documents: one that proves identity and another that proves foreign status. At least one document must show a photograph, except for the age-based dependent exceptions described in the instructions.
Accepted document types include, depending on what each document proves, USCIS photo identification, a U.S. Department of State visa, national identification card, foreign voter registration card, civil birth certificate, certain medical or school records, U.S. or foreign driver’s licenses, military identification, and U.S. state identification. Some documents prove identity only; others can support both identity and foreign status when they meet the IRS conditions.
Dependents Can Have an Additional U.S. Residency Requirement
The supporting-document rules are not identical for every ITIN applicant. A dependent claimed for a federal tax benefit may need evidence of U.S. residency in addition to identity and foreign status. The instructions contain exceptions for certain dependents from Canada or Mexico and dependents of U.S. military personnel stationed overseas, with separate treatment when the credit for other dependents is involved.
A passport containing a U.S. entry date can serve as U.S. residency evidence for a dependent. When the passport lacks that date and residency proof is required, another document is needed. The acceptable evidence changes with age: medical records can be relevant for young children, school records for school-age dependents and certain students, and state identification, driver’s licenses, visas, bank statements, rental statements, or utility bills can be relevant in the categories allowed by the IRS.
Dependent-document distinction: a passport may be enough to prove identity and foreign status while still being insufficient, by itself, to prove U.S. residency. Those are separate evidentiary questions.
The Signature Is Part of the Application, Not a Formality
The applicant normally signs Form W-7 with an original signature. The signature section also records the date and phone number. When someone else signs for the applicant, the authority to sign depends on the applicant’s age and circumstances.
For a dependent under age 18 who cannot sign, a parent or court-appointed guardian can sign under the conditions in the instructions. Adults other than a parent or court-appointed guardian generally need Form 2848 authority. For an applicant age 18 or older, a person other than the applicant or court-appointed guardian generally needs Form 2848 authorizing the signature. A spouse does not automatically have authority to sign Form W-7 for the other spouse.
Ways to Submit the W-7 Application Package
The IRS accepts ITIN applications by mail and through several in-person channels. The choice affects how supporting documents are handled, but it does not change the underlying requirement for a valid W-7 reason, the applicable return or exception evidence, and acceptable identity documentation.
| Method | W-7 Assistance | Document Handling | Location |
|---|---|---|---|
| The applicant prepares and sends the package directly. | Originals or issuing-agency-certified copies are sent with the package when required. | IRS ITIN Operation in Austin | |
| IRS Taxpayer Assistance Center with ITIN services | Free review of a completed Form W-7; the center does not complete the form for the applicant. | Most supporting documents can be authenticated and returned at the appointment; service is by appointment. | United States |
| VITA site with ITIN services | Free W-7 completion and review at participating sites. | Selected sites with Certifying Acceptance Agents can authenticate most permitted documents. | Limited U.S. locations |
| Certifying Acceptance Agent | Fee-based assistance; fees vary by agent. | A CAA can authenticate most permitted documents and return them after review, subject to document-specific limits. | United States and international |
| Acceptance Agent | Fee-based assistance; fees vary by agent. | An AA can help complete and submit Form W-7 but does not authenticate supporting documents in the same manner as a CAA. | United States and international |
For dependents, document-authentication authority is narrower. The IRS states that CAAs can authenticate dependent passports and birth certificates but not the full range of dependent documents. Some school and medical records also need to be mailed rather than authenticated at an IRS Taxpayer Assistance Center.
Mailing a W-7 Package Uses the ITIN Address, Not the Normal Return Address
When Form W-7 is mailed with a federal return, the package does not go to the ordinary mailing address printed in the instructions for Form 1040-NR or another attached return. It goes to the IRS ITIN Operation address specified in the W-7 instructions. The IRS then processes the ITIN application before routing the attached tax return for processing.
For U.S. Postal Service mail, the current W-7 instructions list:
Internal Revenue Service
ITIN Operation
P.O. Box 149342
Austin, TX 78714-9342
Private delivery services use a different street address. Because IRS mailing addresses can change, the applicable W-7 instructions are the controlling source when an application is actually sent.
Form 4868 and Estimated Tax Payments Do Not Require an ITIN First
The W-7 instructions separate an ITIN application from estimated tax payments and an extension request. A person who needs to make an estimated payment using Form 1040-ES or Form 1040-ES (NR), or submit Form 4868 for an extension of time to file, does not attach Form W-7 merely to obtain a number for that payment or extension.
Under the IRS instructions, the identifying-number field on the payment voucher or Form 4868 can contain “ITIN TO BE REQUESTED” where the SSN or ITIN would otherwise appear. The ITIN application is submitted later with the federal tax return or under a valid W-7 exception. This rule prevents the extension or payment process from being mistaken for an ITIN application channel.
A Newly Assigned ITIN Cannot Be Used for E-Filing in the Assignment Year
The IRS does not allow a tax return to be electronically filed using an ITIN during the same calendar year in which that ITIN is assigned. This rule includes prior-year returns filed during that assignment year.
For example, an ITIN assigned during 2026 cannot be used to e-file a return during calendar year 2026. Returns using that ITIN may be eligible for e-filing in later calendar years, subject to the normal e-file rules. This is why a first-time W-7 application attached to a tax return follows a paper-processing path even when the taxpayer might otherwise prefer electronic filing.
What Happens After the IRS Receives Form W-7
The IRS currently tells applicants to allow about 7 weeks for notification of ITIN application status. The stated processing range increases to 9 to 11 weeks for applications submitted during the January 15 through April 30 peak period or from overseas.
The notice received depends on the result of the review. A CP565 notice reports that an ITIN was assigned. A CP566 notice requests additional information needed to process the application. A CP567 notice reports that the ITIN application was rejected and needs to be resubmitted if the applicant continues the request.
When original supporting documents are mailed, the IRS states that they are returned to the mailing address on line 2 and that return can take up to 60 days. A person who needs a passport or another original document sooner may prefer a permitted certified copy or an in-person authentication route rather than mailing the original.
Where the Form, Tax Return, and Documents Can Conflict
Most W-7 problems are not caused by the length of the form. They arise when the reason, line entries, return or exception, and supporting documents do not describe the same tax situation.
- A W-7 reason is not selected, even though the IRS requires one for both new applications and renewals.
- Box b is selected but line 3 does not contain the required complete foreign address.
- A treaty reason is entered without the applicable box h exception information, treaty country, treaty article, or required exception documents.
- The legal name on line 1a does not match the identifying documents or the federal return.
- Visa information is incomplete in a category that depends on U.S. nonimmigrant documentation.
- Line 6d omits the applicable U.S. entry date or fails to state that the applicant never entered the United States when that is the actual situation.
- An ordinary photocopy is submitted where an original or issuing-agency-certified copy is required.
- A dependent passport proves identity and foreign status but does not satisfy a separate U.S. residency requirement.
- A renewal omits the previously assigned ITIN or the name under which it was issued on line 6f.
- An exception is claimed without the specific evidence required by the W-7 exception table.
- The signature section is incomplete or a delegate signs without the authority required by the instructions.
The application works as a connected sequence: application type → W-7 reason → line entries → federal return or exception → identity and foreign-status documents → any residency or category-specific evidence → signature → submission method. Each part should support the same federal tax purpose.
Resources Used
- IRS Form W-7, Application for IRS Individual Taxpayer Identification Number — current form layout, application-type boxes, reason boxes, and line fields.
- IRS Instructions for Form W-7 — eligibility, reason-box rules, line instructions, exceptions, signatures, mailing rules, and processing information.
- IRS: How to Apply for an ITIN — application-package requirements, submission options, document handling, and status notices.
- IRS: ITIN Supporting Documents — acceptable evidence, certified-copy rules, passport treatment, and dependent residency documentation.
- IRS Taxpayer Assistance Centers With ITIN Services — in-person W-7 review and document-authentication services.