Can I reapply if my ITIN application is rejected?

Yes. You can resubmit a corrected application at any time after receiving a rejection notice from the IRS. The rejection letter (CP 567 or similar) will explain exactly why the application was denied. Fix the specific issue, gather any additional documents needed, and resubmit a new Form W-7 package. Keep in mind that each resubmission restarts the 7 to 11 week processing clock, so getting it right the first time saves months of waiting.

Do I need to send original documents with my ITIN application?

If you file on your own, yes. The IRS requires original identity documents or certified copies from the issuing agency. This means mailing your passport to Austin, Texas. However, if you use a Certifying Acceptance Agent, the CAA verifies your documents in person and sends certified copies to the IRS. You keep your originals throughout the entire process and never risk them in the mail system.

How long does it take to get an ITIN after fixing a rejected application?

After you resubmit a corrected application, the IRS processing timeline resets to 7 to 11 weeks from the date they receive the new submission. Add in the time it takes to receive the rejection notice (2 to 4 weeks), prepare the correction, and mail the new package, and a rejected application can delay your ITIN by 3 to 5 months total. This is why avoiding mistakes on the first submission is so important.

Does the IRS reject ITIN applications for expired passports?

Yes. The IRS requires that your passport be valid (unexpired) at the time you submit your W-7 application. An expired passport does not satisfy the identity and foreign status documentation requirements. If your passport expired recently, renew it before applying for an ITIN. A Certifying Acceptance Agent will check your passport expiration date during the document review and flag this issue before submission.

What happens if I forget to attach my tax return to the ITIN application?

The IRS will reject your application. A federal tax return is required for most ITIN applications because it establishes the tax filing purpose that justifies issuing the number. The only exceptions are specific situations like treaty benefits or third-party withholding. If you are applying based on a tax return, that return must be physically included in the same envelope as your W-7 form and supporting documents.

Is it worth paying for a CAA to avoid ITIN application mistakes?

For most applicants, yes. A single rejection costs you 3 to 5 months of delays, the hassle of resubmitting, and potentially the loss of tax credits for that filing year. A Certifying Acceptance Agent reviews your entire application for errors, verifies your documents so you keep your passport, and submits a complete package to the IRS. At itin.so, our Standard service is $197 and Express is $297, both with a 100% money-back guarantee.

How many ITIN applications does the IRS reject each year?

The IRS does not publish an exact rejection rate for ITIN applications. However, based on IRS Statistics of Income data and CAA industry experience, incomplete Form W-7 fields, wrong identity documents, and missing tax return attachments account for the vast majority of rejections. Applications submitted through Certifying Acceptance Agents have significantly lower rejection rates because documents and forms are pre-verified before submission.

What is the most expensive ITIN application mistake in terms of time lost?

Applying during peak season (January through April) without professional help and getting rejected is the costliest mistake. A February rejection means waiting 6 to 8 weeks for the rejection notice, 60 to 90 days for original document return, plus another 10 to 14 weeks for the resubmission to process. Total delay: 5 to 7 months. Using a CAA with Express service during peak season avoids this scenario entirely.

7 ITIN Application Mistakes to Avoid in 2026

Updated April 2026

Quick summary: The IRS rejects thousands of ITIN applications every year for preventable reasons. Incomplete Form W-7 fields, wrong documents, missing tax returns, and simple formatting errors account for the vast majority of denials. Each rejection adds 3 to 5 months to your timeline. This guide covers the 7 most common ITIN application mistakes and shows you exactly how to avoid every one of them.

The IRS processes hundreds of thousands of ITIN applications each year through its Austin, Texas operations center. A significant percentage of those applications come back rejected, and the reasons are almost always preventable. Applicants make the same handful of mistakes over and over again, and each rejection means restarting the entire process from scratch.

Below are the 7 most common ITIN application mistakes we see, along with the exact fix for each one. If you are preparing your own ITIN application, use this as your pre-submission checklist. Or skip the risk entirely and let a Certifying Acceptance Agent handle it for you.

Mistake #1: Submitting an Incomplete Form W-7

What goes wrong: The W-7 is a two-page form with dozens of fields, and the IRS rejects applications when required fields are left blank. Common omissions include the reason-for-applying checkbox (Line 2), the applicant's foreign address, the treaty country and article number (when applicable), and the name and TIN of the person claiming the applicant as a dependent. Some applicants also forget to sign and date the form, which is an automatic rejection.

The fix: Go through every field on the W-7 form line by line before sealing the envelope. Double-check that you selected the correct reason-for-applying box, that both US and foreign addresses are filled in, and that the signature and date are present. If any field does not apply to you, write "N/A" rather than leaving it blank. A CAA reviews every field as part of their standard process and will not submit until the form is complete.

Mistake #2: Sending the Wrong Identity Documents

What goes wrong: The IRS accepts only 13 specific document types for ITIN applications, and they must prove both identity and foreign status. Applicants frequently send documents the IRS does not accept, such as a US driver's license (proves identity but not foreign status), a foreign driver's license alone (does not prove foreign status), or photocopies instead of originals. Others send a valid passport but forget that it also needs to be unexpired.

The fix: Use a valid, unexpired passport whenever possible. A passport is the only single document that satisfies both the identity and foreign status requirements. If you do not have a passport, review the complete list of accepted documents and make sure your combination covers both requirements. Remember that you must send originals or certified copies from the issuing government agency, not photocopies.

Mistake #3: Forgetting to Include the Federal Tax Return

What goes wrong: Most ITIN applications must be submitted along with the federal tax return that creates the need for the ITIN. The IRS uses the tax return to verify that the applicant has a valid tax filing purpose. When the tax return is missing from the package, the IRS sends back everything and the application is considered incomplete. This is one of the most common mistakes and one of the easiest to avoid.

The fix: Include your complete federal tax return (Form 1040 or 1040-NR) in the same envelope with your W-7 form and supporting documents. The only exceptions are applicants who qualify under a specific exception listed in the W-7 instructions, such as claiming treaty benefits, receiving certain types of income subject to withholding, or being a dependent of someone already filing. If you are unsure whether an exception applies, the safest approach is to include the return.

Mistake #4: Selecting the Wrong Reason-for-Applying Code

What goes wrong: Line 2 on the W-7 asks why you need an ITIN. There are seven boxes (a through g), and selecting the wrong one creates a mismatch between your stated reason and your supporting documents. For example, checking box (a) for "nonresident alien filing a US tax return" when you are actually a dependent listed on someone else's return (box d) will confuse the IRS reviewer and can trigger a rejection or a request for additional information that delays processing by weeks.

The fix: Read each option on Line 2 carefully and select the one that matches your exact situation. If you are filing your own tax return, use box (a). If you are a dependent on someone else's return, use box (d). If you are claiming treaty benefits, use box (h). The W-7 form guide explains each code in plain language. A CAA will select the correct code based on your situation and ensure the supporting documents match.

A CAA prevents all 7 of these mistakes

Our Certifying Acceptance Agents review your W-7, verify your documents, and submit a complete application to the IRS. You keep your passport and get a 100% money-back guarantee.

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Mistake #5: Name Mismatches Between Documents

What goes wrong: The name on your W-7 form must match the name on your passport and your tax return exactly. Even small differences cause problems. If your passport says "Mohammad" but you wrote "Mohammed" on the W-7, or if your passport has a middle name that you left off the form, the IRS may reject the application. Differences in the order of first name and surname (common with names from certain countries) also cause mismatches that trigger delays.

The fix: Copy your name exactly as it appears on your passport. Use the same spelling, the same order, and include all middle names or initials. If your passport name differs from the name on your tax return, correct the tax return before submitting. When in doubt, use the passport as the source of truth for every name field on both the W-7 and the tax return. A CAA cross-checks all three documents to ensure everything matches before submission.

Mistake #6: Mailing Documents to the Wrong IRS Address

What goes wrong: ITIN applications go to a specific IRS address in Austin, Texas. This is not the same address you use for regular tax returns. Applicants sometimes mail their W-7 package to the general IRS processing center for their state, or to the address listed on the Form 1040 instructions. When the package arrives at the wrong IRS office, it may be forwarded (adding weeks) or returned entirely. Either way, your application is delayed significantly.

The fix: Mail your complete ITIN application package to: Internal Revenue Service, ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342. Use certified mail with tracking so you have proof of delivery. Do not combine your ITIN application with other IRS correspondence. A CAA handles the submission process entirely, so you never have to worry about the mailing address.

Mistake #7: Applying Too Late in the Tax Season

What goes wrong: Many applicants wait until the April tax deadline to start their ITIN application. By that point, the IRS ITIN Operation center is swamped with applications, and processing times stretch to the longer end of the 7 to 11 week window. If there is any issue with your application, you may not find out until well after the filing deadline has passed. Late applications also mean you cannot e-file your tax return, since the IRS rejects electronic returns with placeholder ITINs.

The fix: Start your ITIN application as early as possible in the tax year. January through early March is the best window for submitting your W-7. This gives you the maximum buffer for IRS processing and leaves time to fix any issues before the April deadline. If you are already past the deadline, file for an extension using Form 4868 and submit your ITIN application with the extended return. The sooner you begin, the smoother the process.

How to Avoid ITIN Application Mistakes in 2026

How Does a Certifying Acceptance Agent Eliminate These Mistakes?

Every mistake on this list comes down to one thing: the applicant had to handle complex IRS requirements on their own. A Certifying Acceptance Agent removes that burden entirely. Here is what a CAA does that a DIY applicant cannot:

Reviews every W-7 field before submission and ensures nothing is blank, incorrect, or mismatched
Verifies your identity documents in person and confirms they meet IRS requirements for both identity and foreign status
Certifies copies of your passport so you never mail your original documents to the IRS
Cross-checks names across your passport, W-7, and tax return to catch mismatches before they become rejections
Selects the correct reason-for-applying code based on your specific situation and supporting documents
Submits to the correct IRS address with proper packaging and tracking
Starts the process early and manages the timeline so your application arrives well before peak season

The result is a complete, accurate application that reaches the right IRS office the first time. No rejections, no resubmissions, no months of extra waiting. The IRS processes CAA-submitted applications at the same 7 to 11 week pace, but the approval rate is dramatically higher because the common errors have already been eliminated before the package leaves the CAA's office.

What Does Our ITIN Application Service Include?

At itin.so, we are IRS-authorized Certifying Acceptance Agents who handle ITIN applications every day. Our process is designed to prevent every mistake on this list before your application reaches the IRS.

Express service: $197. Includes complete W-7 preparation, document verification and certification, IRS submission with tracking, application status updates, and WhatsApp support throughout the process. Your application is prepared within 5 to 7 business days.

Premium service: $297. Everything in Express plus 24-hour preparation and priority review. Ideal for applicants with urgent timelines or complex situations involving multiple documents or treaty-based applications.

Both tiers include a 100% money-back guarantee. If the IRS rejects your application for any reason within our control, you receive a full refund. We have processed thousands of applications and maintain a near-perfect approval rate because we catch the mistakes before they happen.

Ready to apply without the stress? Visit our application page to get started, or message us on WhatsApp if you have questions about your specific situation.

ITIN Application Mistakes: Frequently Asked Questions

The most common reason is incomplete or incorrect Form W-7. Applicants often leave required fields blank, select the wrong reason-for-applying box, or fail to attach a qualifying federal tax return. The IRS rejects the application outright if the W-7 is missing critical information. Working with a Certifying Acceptance Agent eliminates this risk because the agent reviews every field before submission and catches errors that most applicants overlook.

Skip the Mistakes. Get Your ITIN Right the First Time.

Our Certifying Acceptance Agents have processed thousands of ITIN applications with a near-perfect approval rate. Express service starts at $197 and includes W-7 preparation, document certification, IRS submission, and a 100% money-back guarantee.

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