IRS Form W-7 is the application you file to obtain an Individual Taxpayer Identification Number (ITIN). It is a two-page form with over a dozen fields, several of which are frequently completed incorrectly — causing the IRS to reject the application outright. This guide walks through every line of the form, explains what to write, and highlights the specific errors that most commonly delay or derail ITIN applications.

Important: Most applicants are required to attach an original or certified copy of their passport along with a completed federal tax return when filing Form W-7. ITINProf's IRS Certified Acceptance Agents can certify your documents directly, eliminating the need to mail your original passport to the IRS.

What Is Form W-7?

Form W-7, officially titled "Application for IRS Individual Taxpayer Identification Number," is the document through which the IRS processes your ITIN request. It is a single application — not a recurring form — and once your ITIN is assigned, you do not need to file W-7 again unless your ITIN expires due to non-use. The current version of the form is updated periodically; always download the latest version from IRS.gov rather than using an old copy.

The form captures your personal details, the reason you are applying, your immigration status, and the documents you are attaching as proof of identity and foreign status. Each section matters, and the IRS is strict about accuracy.

Before You Start Filling the Form

Gather the following before you put pen to paper or begin typing:

  • Your valid passport (or acceptable alternative identity document — see the documents section below)
  • Your completed federal tax return, unless you qualify for an exception
  • Your US visa details if you have one (visa type, number, expiry date, and US entry date)
  • Your foreign tax identification number, if your home country issues one
  • Your mailing address — this is where the IRS will send your ITIN assignment letter

Form W-7 must be completed in English. Print clearly if filling by hand, or use a PDF editor to type your answers. Use black or blue ink if printing and signing by hand.

Line 1a: Reason for Applying

This is one of the most important fields on the form. You must check one of the lettered boxes that best describes why you need an ITIN. The IRS will use this to determine whether your application is eligible and what supporting documentation is required.

a
Non-resident alien required to get an ITIN to claim a tax treaty benefit. Check this if you are a resident of a country with a US tax treaty and you are claiming reduced withholding or an exemption on US-source income such as dividends, royalties, or interest.
b
Non-resident alien filing a US federal tax return. The most common reason code for foreign nationals who earn US-source income (rental income, investment income, US business income) and are required to file a return.
c
US resident alien (based on days present in the US) filing a US federal tax return. Used when you have spent enough days in the US to meet the Substantial Presence Test under IRS rules.
d
Dependent of a US citizen or resident alien. Used when a non-citizen dependent is being claimed on a US tax return. The dependent must file their own W-7.
e
Spouse of a US citizen or resident alien. Used when a non-citizen spouse is being included on a jointly filed US tax return or is being claimed as an exemption.
f
Non-resident alien student, professor, or researcher filing or claiming an exception. Commonly used by F-1, J-1, or similar visa holders who are not eligible for an SSN but have US tax filing obligations or treaty benefits to claim.
g
Dependent or spouse of a non-resident alien visa holder. Used when the primary visa holder has or is applying for an ITIN and their dependent or spouse also needs one.
h
Other. A catch-all that requires a written explanation. Only use this if none of the above apply. The IRS scrutinizes this selection closely.

Most common scenario: If you are a non-US resident applying for an ITIN to open a US bank account, invest in US markets, or conduct business in the US, you almost certainly need to check box b and attach a US federal tax return. If you are claiming a tax treaty benefit, check box a instead.

Lines 1b–3: Name and Address

Line 1b asks for your legal name exactly as it appears on your identity document. Enter your surname (last name) first, then your given name (first name), then middle name if applicable. Do not use nicknames or shortened versions.

Line 2 asks for your name at birth if it differs from your current legal name — for example, a married name change. If your name has not changed, leave this blank or write "same."

Line 3 is your mailing address. This is the address where the IRS will mail your ITIN assignment letter. It can be a foreign address — many applicants outside the US use their home country address here. Enter the full address carefully, including postal code and country. If you have a US address, you may use that instead.

Address tip: If your mailing address is in a country where mail delivery is unreliable, consider using the address of a trusted person in a stable location, or note in your application that you would prefer to receive your ITIN by a specific method. Some applicants use a US forwarding address.

Lines 4–5: Date and Country of Birth

Line 4 requires your date of birth in MM/DD/YYYY format — note this is the US format, not the DD/MM/YYYY format used in many other countries. Getting this wrong is a common source of rejection. If you were born on March 15, 1990, write 03/15/1990.

Line 5 asks for your country of birth — the country where you were born, not your current country of residence or citizenship. Use the full official country name.

Line 6a: Country of Citizenship

Enter your current country of citizenship. If you hold dual citizenship, enter the country whose passport you are submitting with this application. The passport country and this field should match your submitted identity document.

Line 6b: Foreign Tax Identification Number

If your country of residence issues tax identification numbers — such as the UK's National Insurance Number, Canada's SIN, India's PAN, or similar — enter that number here. This field is optional but helps the IRS verify your identity and process your application more efficiently.

If your country does not issue a foreign tax ID, or if you do not have one, write "N/A" rather than leaving the field blank. A blank field can cause processing delays.

Lines 6c–6e: US Visa and Entry Information

Line 6c asks for your visa type and number if you have or have had a US visa. Common types include B-1/B-2 (tourist/business), F-1 (student), J-1 (exchange visitor), and O-1 (extraordinary ability). Enter the exact visa category and the number printed on your visa stamp.

Line 6d asks for your US visa expiration date and the date you most recently entered the United States, if applicable. If you have never entered the US, write "N/A."

Line 6e asks whether you have previously received an ITIN or SSN. If you already have an ITIN and are renewing it, enter your current ITIN here. If you have an SSN, you are generally not eligible for an ITIN.

Have a Prior ITIN?

Enter it on Line 6e. Renewal applications follow a slightly different process and do not always require a new tax return.

Never Entered the US?

Lines 6c–6d can be marked N/A. Many applicants apply from abroad and have never been to the US.

Supporting Documents: What to Attach

Form W-7 requires you to prove your identity and your foreign status. The IRS accepts 13 types of documents for this purpose. The most commonly used and universally accepted is a valid passport, which can serve as the sole document — it satisfies both the identity and foreign status requirements on its own.

Other accepted documents include:

  • National identification card (must show name, photograph, address, date of birth, and expiry date)
  • US Citizenship and Immigration Services photo identification
  • Visa issued by the US Department of State
  • Civil birth certificate (for dependents under age 18)
  • Medical records (for dependents under age 6)
  • School records (for dependents under age 18 or full-time students)
  • Foreign driver's license
  • Foreign military identification card

Documents must be original or certified copies. A certified copy is one that has been authenticated by the issuing agency — a photocopy you certify yourself is not acceptable. This is why most applicants either mail originals to the IRS or work through an IRS Certified Acceptance Agent, who can certify copies directly without requiring you to send your original passport.

The passport rule: A passport is the only document that satisfies both the identity and the foreign status requirement on its own. If you submit a national ID or driver's license, you must also submit a second document proving your foreign status (such as a visa or civil birth certificate). Using your passport avoids this complexity.

Attaching Your Tax Return

In most cases, Form W-7 must be filed together with a completed US federal income tax return. The tax return must show the ITIN application is needed — for example, a 1040NR with US-source income. The ITIN itself is what you are applying for, so you write "ITIN TO BE REQUESTED" in the Social Security Number field of the return you attach.

Your tax return does not need to be a final, submitted return. It is attached to and submitted with the W-7 as a package. Once the IRS assigns your ITIN, they process the tax return under that number.

Exceptions to the Tax Return Requirement

The IRS provides five exceptions that allow you to apply for an ITIN without attaching a tax return. These are narrow but important:

  1. Third-party withholding on passive income. You are receiving US-source passive income (interest, dividends, rental, royalties) and the payer is withholding tax. You need an ITIN to provide to the withholding agent.
  2. Other income subject to information reporting. Similar to Exception 1 but covering income other than passive income that is subject to Form 1099 reporting.
  3. Mortgage interest. You paid mortgage interest on a US property and need an ITIN to allow the lender to report it to the IRS.
  4. Home sale proceeds. You sold US property and the buyer or settlement agent withheld tax under FIRPTA rules.
  5. Treasury Department financial institutions. You are opening an account at a federally regulated financial institution that requires you to provide a tax ID number.

Exception documentation: Each exception requires specific supporting documentation in place of the tax return. For example, Exception 1 requires a copy of the letter or document from the payer showing the amount of US-source income and the amount withheld. Review the W-7 instructions on IRS.gov for the full requirements of each exception.

How to Submit Your Completed W-7

There are three ways to submit Form W-7:

  • By mail. Mail your completed W-7, tax return, and original identity documents to the IRS ITIN Operations office in Austin, Texas. The address is listed in the W-7 instructions. This method requires you to send your original passport, which means it will be held by the IRS for up to 60 days.
  • In person at an IRS Taxpayer Assistance Center. Select IRS offices accept W-7 applications in person. You bring your documents, they are reviewed and returned immediately. Appointments are required and availability is limited.
  • Through an IRS Certified Acceptance Agent (CAA). A CAA is authorized by the IRS to verify identity documents and certify copies on your behalf. You do not need to mail your original passport. The CAA reviews your documents, certifies copies, completes a Certificate of Accuracy (Form W-7 COA), and submits your application. This is the method used by ITINProf and the safest option for applicants outside the United States.

Beware of unauthorized preparers: Only IRS Certified Acceptance Agents are authorized to certify your identity documents for ITIN purposes. A tax preparer or notary who is not a CAA cannot certify your documents — their certification will be rejected by the IRS. Always confirm your preparer's CAA status before submitting.

After Submission: What to Expect

Once the IRS receives your W-7 package, they will:

  1. Acknowledge receipt (usually within 7 weeks)
  2. Review your application and documents
  3. Assign your ITIN and send an ITIN assignment letter to your mailing address
  4. Process your attached tax return using your new ITIN

If you submitted original documents by mail, the IRS returns them to your mailing address after processing — typically within 60 days. If they are not returned within that period, contact the IRS directly. Current processing times for ITIN applications are typically 7 to 11 weeks when submitted during peak tax season (January through April) and 7 weeks at other times of year.

Common Mistakes That Cause Rejection

These are the errors that most frequently result in the IRS returning a W-7 package unprocessed:

  • Wrong date format. The IRS requires MM/DD/YYYY. Writing 15/03/1990 instead of 03/15/1990 is one of the most frequent causes of rejection for international applicants.
  • Mismatched name on form and passport. The name on Line 1b must match exactly the name on your identity document, including the order of names and any middle names.
  • Submitting an expired passport. The IRS does not accept expired identity documents unless the applicant is a dependent under 14 (or under 18 if a student).
  • No tax return attached (when required). Submitting W-7 without the required federal tax return, without qualifying for a specific exception, is the most common cause of rejection.
  • Using the wrong form version. Using an outdated version of Form W-7 will result in the application being returned. Download the current version from IRS.gov each time.
  • Leaving "N/A" fields blank. Fields that do not apply to you should be marked "N/A," not left empty. Blank fields create uncertainty about whether the form was completed fully.
  • Uncertified document copies. Submitting photocopies you made yourself rather than original documents or CAA-certified copies.
  • Missing signature. The applicant or, for a dependent, the parent or guardian must sign and date the form. Unsigned W-7s are returned immediately.

Why professional preparation matters: The IRS rejects a substantial proportion of self-prepared ITIN applications due to errors in the W-7 or problems with the attached documents. An IRS Certified Acceptance Agent reviews every detail before submission, identifies issues in advance, and certifies your documents directly — dramatically reducing rejection risk.

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