What Is a Certifying Acceptance Agent? Why It Matters

What Does a Certifying Acceptance Agent Do?

The IRS created the Certifying Acceptance Agent program to make ITIN applications easier and more secure. A CAA performs three core functions:

1. Document verification. The CAA examines your original identity and foreign status documents (passport, national ID, birth certificate, or other IRS-accepted documents) to confirm they are genuine and meet IRS standards.
2. Form W-7 preparation. The CAA helps you complete Form W-7 accurately, ensuring every line matches your documents and the correct reason-for-applying box is checked.
3. Application submission. The CAA packages your Form W-7, Certificate of Accuracy, tax return (if required), and any supporting documents, then submits the complete package to the IRS.

To become a CAA, an individual must apply to the IRS, pass a suitability check, complete an IRS-approved training program, and maintain their certification annually. This ensures every CAA meets a consistent standard of knowledge about ITIN requirements.

Why Use a CAA: No Passport Mailing Required

The single biggest reason applicants choose a CAA is document security. When you apply by mail without a CAA, you must send your original passport (or certified copies) to the IRS processing center in Austin, Texas. The IRS returns documents within 60 days, but during that time you cannot travel internationally or use your passport for identification.

With a CAA, your passport never leaves your hands. The CAA verifies your documents and issues IRS Form 13551 (Certificate of Accuracy), which the IRS accepts as proof that a trained, authorized agent has confirmed the authenticity of your documents.

How CAAs Verify Your Documents

The document verification process follows strict IRS guidelines. Here is what happens when you work with a CAA:

1. In-person or secure remote review. You present your original documents to the CAA. Many CAAs offer in-person meetings, while others (including itin.so) use secure video verification for remote clients.
2. Authenticity check. The CAA inspects each document for signs of tampering, confirms it is unexpired, and verifies that the information matches across all documents and your Form W-7.
3. Certificate of Accuracy. After verification, the CAA completes IRS Form 13551, certifying that they have reviewed the original documents and found them to be authentic. This form is signed by the CAA and includes their IRS-assigned CAA number.
4. Document return. Your original documents are returned to you immediately after verification. They are never mailed to the IRS.

For detailed information on which documents you need, see our Form W-7 completion guide.

How to Find a Certifying Acceptance Agent

The IRS maintains an official directory of all authorized Certifying Acceptance Agents. You can search the directory on the IRS website by state (for US-based CAAs) or by country (for international CAAs). The directory lists each CAA's name, location, and contact information.

When choosing a CAA, consider the following:

• Do they offer remote document verification?
• What are their fees and what services are included?
• Do they prepare the tax return as well, or only the W-7?
• How long have they been an active CAA?
• Do they provide post-submission support if the IRS has questions?

Many CAAs work with clients across the country and internationally. You do not need to find one in your local area if they offer secure remote verification.

Our CAA Team at itin.so

itin.so is an IRS-authorized Certifying Acceptance Agent. Our team has processed thousands of ITIN applications and maintains a high first-time approval rate. We offer both in-person and remote document verification, making our services accessible to applicants anywhere in the world.

When you work with itin.so, our service includes:

• Full document verification and Certificate of Accuracy
• Complete Form W-7 preparation and error checking
• Submission of your entire application package to the IRS
• Post-submission tracking and support
• Assistance responding to any IRS notices

Our goal is to make the ITIN process as smooth as possible. We review every detail before your application reaches the IRS, so you can avoid the delays and frustrations that come with incomplete or incorrect submissions.

CAA vs. Mailing vs. Taxpayer Assistance Center

You have three ways to submit an ITIN application. Here is how they compare:

For most applicants, a CAA offers the best combination of document security, convenience, and application accuracy. The fee is a small price compared to the cost of a rejected application, lost documents, or months of delays.