If you are a non-U.S. resident or a foreign national with U.S. tax obligations, you must know how to file for ITIN number correctly. This guide will walk you through every step you need to take — from filling out Form W-7 to submitting your application to the IRS.
Contents
- 1 Why You Need to File for ITIN Number
- 2 What Is an ITIN and Who Needs One?
- 3 How to File for ITIN Number in 2025
- 4 Common Mistakes When You File for ITIN Number
- 5 Frequently Asked Questions About File for ITIN Number
- 5.1 What is the best way to file for ITIN number?
- 5.2 Where do I mail my file for ITIN number?
- 5.3 Can I file for ITIN number without sending original documents?
- 5.4 What form do I need to file for ITIN number?
- 5.5 How long does it take to get an ITIN after I file?
- 5.6 Can I apply for an ITIN in person?
- 5.7 Is a tax return always required when I file for ITIN number?
- 5.8 What documents are accepted when filing for an ITIN?
Why You Need to File for ITIN Number
The need to file for ITIN number usually arises when individuals are not eligible for a Social Security Number but still need to file a U.S. tax return. This includes nonresident aliens, dependents or spouses of U.S. citizens or residents, and individuals claiming tax treaty benefits.
What Is an ITIN and Who Needs One?
An Individual Taxpayer Identification Number (ITIN) is issued by the IRS for tax processing purposes. If you are not eligible for an SSN, you must file for ITIN number to stay compliant with U.S. tax laws. This applies to:
- Nonresident aliens with U.S. income
- Spouses and dependents of U.S. citizens or resident aliens
- Individuals needing to claim tax treaty benefits
How to File for ITIN Number in 2025
Filing for an ITIN involves several steps, and understanding each one can save you time and prevent delays.
Step 1: Complete Form W-7 – Application for IRS Individual Taxpayer Identification Number
The official way to file for ITIN number is by submitting Form W-7 to the IRS. This form collects personal identification information and states your reason for needing an ITIN.
Form W-7 Key Sections:
- Full legal name and birth information
- Current U.S. mailing address
- Foreign address (if applicable)
- Reason for applying (e.g., “Nonresident alien filing a U.S. tax return”)
Be sure to attach your tax return (if required) and submit valid identification documents with the form.
Step 2: Gather and Submit Identification Documents
To successfully file for ITIN number, you must include original documents or certified copies. The passport is the most widely accepted ID, but you can also use:
- National ID cards
- Foreign driver’s licenses
- Birth certificates (especially for dependents)
- S. visas or immigration documents
Step 3: Choose How to Apply for an ITIN
You can apply for an ITIN and submit your file in three ways:
| Application Method | Description | Details |
|---|---|---|
| To Mail Your File for ITIN Number to the IRS | Send your Form W-7, tax return, and supporting documents directly to the IRS by mail. | IRS ITIN Operation P.O. Box 149342 Austin, TX 78714-9342 USA |
| To Visit an IRS-Certified Acceptance Agent | Certified agents can verify your documents so you don’t have to send original IDs by mail. | Safer and faster alternative for many applicants. |
| To Apply In Person at a Taxpayer Assistance Center | Make an appointment and submit your application directly to a local IRS office. | Check availability and schedule online via the IRS website. |
Common Mistakes When You File for ITIN Number
Avoid delays by being aware of these common errors:
- Submitting expired identification documents
- Missing signatures on Form W-7
- Forgetting to include a tax return (if required)
- Using incorrect mailing addresses
By preparing thoroughly, you’ll increase your chances of getting approved quickly when you file for ITIN number.
Frequently Asked Questions About File for ITIN Number
Whether you’re filing taxes, claiming dependents, or requesting a treaty benefit, learning how to file for ITIN number is crucial for nonresident individuals in the U.S. Following these steps ensures your application is complete, accurate, and ready for IRS review.
What is the best way to file for ITIN number?
You can file for an ITIN by mailing your Form W-7 and documents to the IRS, visiting an IRS-Certified Acceptance Agent, or applying in person at a Taxpayer Assistance Center.
Where do I mail my file for ITIN number?
You should mail your completed Form W-7, your tax return, and original or certified supporting documents to:
IRS ITIN Operation
P.O. Box 149342
Austin, TX 78714-9342
USA
Can I file for ITIN number without sending original documents?
Yes. If you apply through an IRS-Certified Acceptance Agent, they can verify your documents so you don’t have to send originals.
What form do I need to file for ITIN number?
You must complete Form W-7 (Application for IRS Individual Taxpayer Identification Number) and submit it along with the required documentation.
How long does it take to get an ITIN after I file?
The IRS typically processes ITIN applications within 6 to 10 weeks. You can call the IRS to check the status.
Can I apply for an ITIN in person?
Yes. You can apply for ITIN in person by scheduling an appointment at an IRS Taxpayer Assistance Center that offers ITIN services.
Is a tax return always required when I file for ITIN number?
In most cases, yes. A federal tax return must be attached to Form W-7, unless you qualify for an exception (e.g., claiming a tax treaty benefit).
What documents are accepted when filing for an ITIN?
The most common document is a valid passport. Alternatively, you may use a combination of national ID cards, foreign driver’s licenses, visas, and birth certificates (for dependents).
