Applying for an ITIN can feel confusing, especially when the IRS requests specific documents. Many applications are delayed because documents are missing or unclear.
At Nolly.com, we help clients worldwide prepare complete ITIN applications that meet IRS requirements.
Here is a clear breakdown of what documents you need and why they matter.
Proof of Identity
- The IRS must confirm who you are.
- The most commonly accepted document is a valid passport.
A passport proves:
- Your identity
- Your foreign status
- Your date of birth
Expired or damaged passports often cause delays.
Supporting Tax Purpose
- The IRS requires proof of why you need an ITIN.
- In most cases, this is shown by attaching a tax return such as a 1040NR.
In other situations, official documents may be used instead, such as FIRPTA paperwork or withholding statements.
Form W-7
- Form W-7 is the ITIN application itself.
- It must be filled out accurately and signed.
Even small errors on this form can delay processing.
Proof of Foreign Status
- Your passport usually satisfies this requirement.
- If no passport is available, additional documents may be required.
The IRS must confirm that you are not a U.S. resident.
Supporting Income Documents
Depending on your situation, this may include:
- Form 1042-S
- Rental income statements
- Investment income documents
- Property sale records
These documents support your tax return and refund claim.
Why Original Documents Are Risky
- Applying on your own often requires mailing original documents to the IRS.
- This increases the risk of loss and delays.
Using a Certified Acceptance Agent allows identity verification without mailing originals.
Common Document Mistakes
- Submitting expired identification
- Missing signatures
- Using outdated forms
- Providing unclear copies
- Choosing the wrong exception category
These mistakes restart the processing timeline.
How Nolly.com Helps
At Nolly.com, we:
- Review all documents carefully
- Verify identity securely
- Prepare accurate W-7 forms
- Attach correct supporting documents
- Submit complete applications
This reduces delays and rejection risk.
Processing Time Expectations
- Once submitted correctly, ITIN processing usually takes six to ten weeks.
- Incomplete applications take much longer.
Final Thoughts
Having the right documents is the most important part of a successful ITIN application. Preparing everything correctly from the start saves time and stress.
Start your ITIN application with Nolly.com today. Our certified experts ensure your documents are complete and accurate.
Published January 5, 2026. General information, not tax advice. Nolly Services Inc is a private company and is not part of the IRS.
