If you earn income in the US but aren’t eligible for a Social Security number, you may need an Individual Taxpayer Identification Number (ITIN) to file taxes. This guide explains how the process works, what to prepare and how to avoid expensive mistakes.
What an ITIN Is and Isn’t
An ITIN is a tax processing number issued by the IRS to people who must file US taxes but don’t have, and aren’t eligible for, an SSN. It is for tax purposes only: it doesn’t authorize you to work in the US and doesn’t provide Social Security benefits. Using an ITIN to file taxes helps create a record of your income and residence, which can later support credit applications and other processes. For questions about immigration status or work authorization, talk to a licensed attorney or accredited representative.
Step 1: Gather Your Documents
For a first-time ITIN application, the IRS asks for the following, according to its official ITIN application page:
- Form W-7, Application for Individual Taxpayer Identification Number. Each person applying needs their own completed W-7.
- A US federal income tax return (Form 1040 or Form 1040-NR), with the W-7 attached to the front. The IRS notes that in certain cases you may meet an exception to the filing requirement.
- Proof of foreign status and identity. A valid passport is the only stand-alone document. Otherwise you generally need at least two documents from the IRS’s official list. Dependents also need proof of US residency.
Always check the current list in the Instructions for Form W-7, since documents and exceptions are updated.
Step 2: Choose How to Submit
The IRS lists several ways to apply:
| Option | Cost | Notes |
|---|---|---|
| By mail to the IRS ITIN Operation in Austin, Texas | Postage | You send original documents, so use trackable delivery |
| IRS Taxpayer Assistance Center with ITIN services | Free | Appointment may be required |
| VITA site with ITIN services | Free | Limited locations |
| Certifying Acceptance Agent (CAA) | Fee | Can authenticate most documents, so you may not need to mail originals |
| Acceptance Agent | Fee | Cannot authenticate most documents |
If you don’t want to mail your passport or other original documents, a CAA, a Taxpayer Assistance Center or a VITA site with ITIN services can be a safer route. Ask any provider upfront about the fee and what they will keep or return.
Step 3: Wait for Processing
The IRS says to allow 7 weeks to be notified of your ITIN application status, and 9 to 11 weeks during tax season (January 15 to April 30) or if you applied from overseas. Plan ahead: applying early, before the busy season, can shorten the wait.
Step 4: Prepare Your Tax Return Correctly
Your first return is the foundation of your tax history, so accuracy matters.
Information you’ll typically need:
- Income documents (Form W-2 from an employer, Form 1099 for contract work, or your own records if self-employed)
- Your ITIN (or the W-7 application attached to the return)
- Details for any dependents
- Bank information for refunds (optional, but direct deposit is faster)
Report all income, even if you were paid in cash. Keep records of what you earned and any allowable business expenses.
Step 5: Use Free or Low-Cost Help
You don’t need to pay a lot to file correctly:
- VITA (Volunteer Income Tax Assistance): free help for eligible taxpayers, including some sites with ITIN services. Eligibility depends on factors such as income, so check on IRS.gov or call the site.
- IRS-credentialed preparers: ask for their credentials, and make sure they sign the return with their preparer tax identification number.
- Tax software: some products support ITIN filers, but not all do. Check before you start.
Red Flags: How to Avoid Tax Scams
- Never sign a blank or incomplete return.
- Avoid preparers who promise a bigger refund before looking at your documents.
- Avoid preparers who calculate their fee as a percentage of your refund.
- Don’t use anyone who won’t sign the return or give you a copy.
- Be careful with “notarios” who offer immigration help as part of tax services. They are not attorneys.
After You Get Your ITIN
- Keep it active. An ITIN that isn’t used on a federal return for three consecutive years can expire, and older ITINs can also need renewal. See our ITIN renewal guide.
- Use it to build credit. Some lenders accept ITINs. See our guide to credit cards that accept ITIN or no SSN, and learn about mortgages with an ITIN.
- Open a bank account, if you haven’t. See prepaid cards for immigrants without a bank account as a starting point.
Common Mistakes
- Sending original documents by regular mail with no tracking
- Waiting until the filing deadline to apply (processing takes weeks)
- Paying someone to prepare a return without checking credentials
- Forgetting to report all income
- Not keeping a copy of the submitted return and the W-7
Quick Checklist
- Passport (or the required document combination) ready
- Form W-7 completed for each applicant
- Federal tax return prepared, or an exception confirmed
- Submission route chosen (mail, TAC, VITA, CAA)
- Copies of everything saved
- Calendar reminder set for the processing window
Final Thoughts
Filing taxes with an ITIN for the first time takes preparation, but it’s manageable, and it builds the paper trail that makes later financial steps easier. When in doubt, use a free VITA or Taxpayer Assistance Center option, or a verified, credentialed preparer. This guide is general information, not tax or legal advice; confirm current requirements on IRS.gov.