Applying for an ITIN, or Individual Taxpayer Identification Number, is an important step for many non-U.S. residents who need to file taxes or claim refunds. But even small mistakes can delay approval or lead to rejection from the IRS. At Nolly.com, we help clients around the world avoid these common errors and receive their ITINs smoothly. Here’s what you need to know to ensure your application is correct the first time.
Missing or Incorrect Documents
The most common reason ITIN applications are rejected is missing or incorrect documents. The IRS requires proof of both identity and foreign status — usually a passport. If the passport is expired or missing key information, your application will be delayed. Always double-check that the document is valid and matches the details on your Form W-7.
Incomplete Form W-7
Many applicants make small errors on Form W-7, such as leaving blank spaces or checking the wrong boxes. These small mistakes can cause months of delay. Review every section carefully, especially the reason for applying. If you are applying to file a 1040NR tax return or claim a FIRPTA refund, make sure that box is clearly marked.
Not Providing a Supporting Tax Document
The IRS requires a valid tax document with your application, such as a 1040NR or 8288 form. This shows that you have a legitimate reason for needing an ITIN. Forgetting to include it is one of the fastest ways to get your application rejected.
Mailing Original Passports
Many people still try to mail their original passport to the IRS. This is risky and unnecessary. If you work with a Certified Acceptance Agent like Nolly.com, we verify your identity and documents on a video call. You don’t send your passport to the IRS, and your application is submitted securely.
Using Old or Outdated Forms
The IRS occasionally updates its forms. Submitting an old version of Form W-7 can cause automatic rejection. Before applying, make sure you are using the current version of the form and that it’s filled out correctly.
Forgetting to Sign the Application
It sounds simple, but unsigned forms are more common than you might think. Always review your documents before submission to make sure both your name and signature are clearly visible.
How to Avoid These Mistakes
The best way to avoid ITIN delays is to work with a Certifying Acceptance Agent. At Nolly.com, our agents review your information, verify your identity, and submit your ITIN application directly to the IRS. This ensures everything is accurate, up to date, and compliant with IRS standards.
Final Thoughts
ITIN applications can seem complicated, but they don’t have to be stressful. With expert help, your chances of fast approval increase dramatically. Start your ITIN application with Nolly.com today and let our certified specialists handle the process for you. You’ll save time, avoid mistakes, and get your ITIN faster.
Published November 3, 2025. General information, not tax advice. Nolly Services Inc is a private company and is not part of the IRS.
