You require an Individual Taxpayer Identification Number (ITIN) to file United States taxes when you don’t have eligibility for a Social Security Number (SSN). This complete resource introduces ITIN applications with step-by-step guidance that covers essential knowledge alongside correct completion protocols.
What is an ITIN?
The Internal Revenue Service (IRS) creates Individual Taxpayer Identification Numbers to serve as tax processing identifiers for people who lack Social Security Number eligibility. The tax identification system consists of nine digits present in the same format as an SSN (XXX-XX-XXXX) with its primary use in tax processing.
Who Needs an ITIN?
You need an ITIN if:
- You must file a U.S. tax return because you are a non-resident alien.
- Your U.S. tax return filing status is as a resident alien when your length of stay in the U.S. determines your U.S. tax return calculation.
- You’re a dependent or spouse of someone who legally resides in or is a citizen of the United States.
- Your tax filing status applies under either a dependent relationship or as the spouse of a non-resident alien visa holder.
- A non-resident alien receiving a tax treaty advantage is included in this group.
The Internal Tax Identification Number system exists to help people report their taxes to the U.S. federal government. The IRS does not consider ITINs as alternative sources of work authorization or Social Security eligibility documentation.
Step-by-Step Guide to Applying for an ITIN

Step 1: Gather Required Documents
To apply for an ITIN, you will need:
- Form W-7: This is the official ITIN application form.
- Tax Return: A completed federal tax return (e.g., Form 1040) unless you qualify for an exception.
- Supporting Identification Documents: You must provide original documents or certified copies that verify your identity and foreign status. Acceptable documents include:
- Passport (the only stand-alone document).
- National ID card (must show photo, name, current address, date of birth, and expiration date).
- U.S. visa.
- Foreign birth certificate.
- U.S. driver’s license.
- U.S. state ID card.
- Foreign voter’s registration card.
Step 2: Complete Form W-7
Form W-7 requires the following information:
- Reason for applying for an ITIN (e.g., filing a tax return, claiming a treaty benefit).
- Personal information:
- Name as it appears on your identification documents.
- Mailing address.
- Foreign address (if applicable).
- Date of birth and country of birth.
- Other details:
- Country of citizenship.
- Foreign tax ID number (if applicable).
- Type of document(s) you’re submitting.
Make sure the information matches your supporting documents exactly to avoid delays.
Step 3: Attach Your Federal Tax Return
Unless you qualify for an exception, you must include your completed federal tax return with Form W-7. This is necessary because the ITIN is issued for tax reporting purposes.
Step 4: Submit Your Application
You can submit your ITIN application through one of the following methods:
- Mail: Submit Form W-7 along with your tax return along with original or certified supporting documents to: Internal Revenue Service ITIN Operations P.O. Box 149342 Austin, TX 78714-9342
- In Person: Document verification for Individual Taxpayer Identification Number applications can be obtained at an IRS Taxpayer Assistance Center (TAC) along with certification through a Certifying Acceptance Agent (CAA) network.
- Through a CAA: You can get application assistance and optional documentation certification from a Certifying Acceptance Agent who will help you avoid original document mailing.
Step 5: Wait for Processing
When you submit your application, the IRS takes over the review process. Standard Individual Taxpayer Identification Number processing takes 7 weeks but might extend during major tax periods. After your ITIN passes the IRS assessment you will get a notification letter containing your approved tax identification number. The IRS will return your rejected application together with specific correction requirements.
Common Mistakes to Avoid
- Incomplete Form W-7: Verify that you have properly completed each field on the application.
- Incorrect or Expired Documents: All your documents must be current versions which conform to IRS standards.
- Missing Tax Return: The approval process will get delayed because of omitting required tax return submission.
- Mailing Original Documents Without Certification: Choose a CAA or be certain you feel secure sending your original documentation by mail.
FAQs About ITINs
1. Can I use an Individual Taxpayer Identification Number to work in the U.S.?
No, The Internal Taxpayer Identification Number provides tax reporting functionality yet lacks authority for employment in the United States.
2. Can I apply for an Individual Taxpayer Identification Number without filing a tax return?
In most cases, no. An Individual Taxpayer Identification Number remains valid for tax reporting purposes but specific exceptions apply including dependents or spouses or treaty benefits.
3. How do I renew my Individual Taxpayer Identification Number?
To renew an Individual Taxpayer Identification Number that approaches expiration you must file Form W-7 while submitting necessary supporting documents. A tax return is not a required document for ITIN renewal.
4. What happens if I don’t renew my Individual Taxpayer Identification Number?
When you submit a tax return with an expired Individual Taxpayer Identification Number the IRS might keep your return pending until your ITIN renewal is processed.
5. Can I get an Individual Taxpayer Identification Number for my child?
Under IRS guidelines dependent children who fulfil requirements can obtain an ITIN.
Why Choose AtoZFiler.com for Your ITIN Application?
Using AtoZFiler.com you can easily navigate the complex ITIN application process. Here’s why you should choose us:
- Expert Assistance: The members of our team take responsibility for your application’s accuracy as well as its full completion.
- Hassle-Free Process: Our team conducts every step of the process starting with document preparation reaching through to submission.
- Fast Processing: Thanks to our optimized application process you will receive your ITIN without unnecessary waiting periods.
- Secure and Reliable: Your documents are secured under our unbeatable care system.