How to Become a Certified Acceptance Agent (CAA)

A Certified Acceptance Agent (CAA) is a tax professional who has been authorized by the IRS to verify the identity and foreign status documents of ITIN applicants in-office. When you hold CAA status, clients never have to mail their original passport or birth certificate to the IRS. You authenticate the documents, certify them on Form W-7, and submit the application on the client's behalf. It is a meaningful upgrade over standard Acceptance Agent status, and for preparers serving immigrant, international student, or foreign investor populations, it is one of the most practical credential additions available.

This guide covers everything a PTIN holder needs to understand the CAA program: what distinguishes a CAA from a basic Acceptance Agent, who needs an ITIN and why that population represents real year-round demand, the application sequence including Form 13551 and the forensic document training requirement, the W-7 workflow you will actually run, program limits and restrictions, and the commercial case for adding ITIN services to your practice. TaxWise supports ITIN returns, and ATP has worked with independent preparers in this space for over 25 years.

What Is a Certified Acceptance Agent?

A Certified Acceptance Agent is a person or entity authorized by the IRS under the Acceptance Agent Program to assist non-resident aliens, foreign nationals, and other individuals who are not eligible for a Social Security Number (SSN) in applying for an Individual Taxpayer Identification Number (ITIN). The defining capability of a CAA (as opposed to a standard Acceptance Agent) is the authority to authenticate identity documents.

When an individual applies for an ITIN through the IRS directly, they must generally submit original identity documents or certified copies. Original documents, including passports, can be lost or delayed in mail. A CAA resolves this problem: the CAA reviews the actual documents in person, completes the certification section of Form W-7, and submits the application to the IRS. The client keeps their original documents.

CAA vs. Acceptance Agent (AA): The Key Distinction

The IRS recognizes two tiers of Acceptance Agent:

• Acceptance Agent (AA): Can assist applicants in completing Form W-7 and can forward applications to the IRS, but cannot certify documents. ITIN applicants working with an AA must still provide original documents or certified copies from the issuing agency (for example, a certified copy from the passport authority) directly to the IRS.
• Certified Acceptance Agent (CAA): Can review original documents in-office, authenticate them, and certify on Form W-7 that the documents are genuine. Clients do not mail originals to the IRS. This is the substantive practical advantage of CAA status and the reason most preparers who serve this population seek it rather than basic AA status.

The IRS maintains a searchable directory of CAAs at IRS.gov. Being listed in that directory makes your practice visible to individuals actively searching for ITIN assistance in your area.

Who Needs an ITIN?

An ITIN is issued to individuals who have a US tax obligation but are not eligible for a Social Security Number. The IRS issues ITINs only for federal tax purposes; they do not confer work authorization, immigration status, or any other benefit.

The populations most likely to need ITIN preparation services include:

• Non-resident aliens with US-source income: Individuals who are not US residents but earn wages, dividends, rental income, or other income in the United States are required to file US tax returns and need an ITIN to do so.
• Foreign nationals living in the US: Individuals present in the United States on certain visa categories who earn income here but are not authorized to obtain an SSN.
• Undocumented residents with US income: Individuals living and working in the United States without work authorization who nonetheless have US tax obligations. The IRS issues ITINs regardless of immigration status.
• International students and scholars: F-1, J-1, and other visa holders who are not yet eligible for an SSN but receive scholarships, fellowships, or other taxable income.
• Foreign investors in US real estate: Non-resident aliens who own US real estate and receive rental income, or who sell US property and are subject to FIRPTA withholding, need ITINs to file and claim refunds.
• Dependents and spouses on certain returns: Non-resident alien spouses or dependents listed on a US tax return who need a tax identification number.

In practical terms, any person who has a US tax obligation but cannot obtain an SSN needs an ITIN. The population is concentrated in metro areas with large immigrant communities, university towns with international students, and markets with significant foreign real estate investment, but ITIN filers exist in virtually every geographic market where preparers operate.

The CAA Application Process: Step by Step

Becoming a Certified Acceptance Agent requires completing a defined sequence before you submit your application. Each step depends on the one before it. The IRS CAA application open season currently runs from May 1 through August 31 each year. Verify current open season dates at IRS.gov before planning your application, as the IRS may update these dates.

Forensic Document Training: What the IRS Requires

The forensic document training requirement is what separates CAA status from basic Acceptance Agent status. Because CAAs are certifying that physical documents are genuine, the IRS requires each applicant to complete a training course covering how to examine and authenticate foreign identity documents.

What the Training Covers

IRS-approved training programs for CAA applicants typically cover:

• Passport authentication: how to identify security features, confirm validity, and detect signs of tampering or forgery
• National identity card examination: how to assess cards from various countries that the IRS recognizes for ITIN purposes
• Birth certificate review: how to evaluate birth certificates, including foreign-issued documents, when used in combination with other identity documents
• Visa document review: how to assess US visa stamps and related documents that may appear in a W-7 package
• Foreign document verification principles: general methodology for assessing documents from countries whose document standards differ from US norms

IRS-Approved Training Paths

The IRS maintains a list of approved forensic document training vendors. The current approved vendor list is published on the IRS Acceptance Agent Program page at IRS.gov. Before enrolling in any course, confirm the vendor appears on the current approved list. Completing a non-approved training course will not satisfy the requirement.

Training must be renewed periodically; the IRS specifies the renewal interval in its current CAA program guidance. Check IRS.gov for the current renewal schedule before your existing training expires. Lapsed training is one of the most common reasons a CAA authorization is not renewed.

CAA Renewal and Annual Reporting

CAA authorization is not permanent. The IRS requires ongoing participation and periodic renewal to remain in the program.

Authorization Renewal

CAA authorization must be renewed according to the schedule the IRS specifies in its current program guidance. Renewal typically requires demonstrating that your forensic document training is current and that your PTIN and other credentials remain in good standing. Confirm the current renewal period and requirements at IRS.gov before your authorization lapses; a lapsed CAA cannot certify documents until the renewal is processed.

Annual Reporting of ITIN Applications

CAAs are required to report annually to the IRS on the number of ITIN applications submitted during the prior year. This reporting is a condition of participation in the program. Verify the current reporting format and deadline in the IRS CAA program guidance at IRS.gov.

Reporting Changes to Your Business

CAAs are required to notify the IRS promptly of changes in business address, responsible personnel, or other material changes to the information provided on their original Form 13551. Operating under outdated information on file with the IRS can jeopardize your authorization standing.

Form W-7 Workflow as a CAA

Once you are authorized, the process of handling an ITIN application for a client follows a specific sequence. Understanding this workflow before your first application will prevent errors that delay processing.

Step 1: Gather Required Documents

Identify the combination of documents the applicant will present. The IRS specifies which documents are acceptable for ITIN purposes and which combinations satisfy the identity and foreign status requirements. See the document types section below for the general framework. Review current IRS guidance on acceptable documents at IRS.gov, as the list and requirements are subject to update.

Step 2: Examine and Certify the Documents

Examine each original document using your forensic document training. A CAA may not certify a document based on a photocopy; you must inspect the original. Once you have confirmed authenticity, complete the certification section of Form W-7. Your certification states that you have reviewed the original documents and that they appear genuine.

Step 3: Complete Form W-7 and the Related Return

In most cases, a Form W-7 must be submitted with a completed federal tax return. There are exceptions for certain categories of applicants (dependents, spouses, and specific treaty or exception categories), but the general rule is that the ITIN application accompanies a return. Complete both the W-7 and the return carefully; errors on either document can result in rejection.

Step 4: Submit to the IRS

CAAs may submit Form W-7 and the accompanying return by mail to the IRS ITIN Operations unit, or in person at an IRS Taxpayer Assistance Center (TAC) that accepts ITIN applications. In-person submission at a TAC can reduce document review time because the IRS can inspect the documents directly. Verify current TAC availability and appointment requirements at IRS.gov.

Processing Times

IRS processing times for ITIN applications vary. Do not quote fixed timelines to clients. Verify current ITIN processing time estimates at IRS.gov before advising clients on expected wait times.

For the complete preparer workflow once you are a CAA (intake, Form W-7 completion, document authentication, mailing, ITIN renewal), see the ITIN guide for tax preparers.

Documents CAAs Can Certify

The IRS specifies which documents are acceptable to establish identity and foreign status for ITIN purposes. CAAs may certify documents that appear on the IRS-approved list. The following represents the general framework of acceptable documents under current IRS CAA program rules, but you must verify the current complete list and any combination requirements at IRS.gov before certifying any document for a client.

• Passport (all nationalities): A valid, unexpired passport is the only document that can satisfy both the identity and foreign status requirements on its own. It is the most commonly presented document in ITIN applications.
• National identification card: Issued by the applicant's country of citizenship; must show name, photograph, address, date of birth, and expiration date (if applicable).
• US driver's license: Acceptable for identity but not for foreign status; must be combined with a foreign status document.
• Civil birth certificate: Required for dependents under 18 when a passport is not available. Establishes identity and foreign status when combined with a school record (for dependents aged 6 through 18).
• Foreign driver's license: Acceptable for identity in combination with a foreign status document.
• US state identification card: Acceptable for identity in combination with a foreign status document.
• Foreign voter's registration card: Acceptable for identity and foreign status.
• US military identification card: Acceptable for identity in combination with a foreign status document.
• Foreign military identification card: Acceptable for identity and foreign status.
• Visa issued by the US Department of State: Acceptable for foreign status; typically combined with a passport.
• US Citizenship and Immigration Services (USCIS) photo identification: Acceptable for identity and foreign status.
• Medical records (for dependents under 6 only): Acceptable for identity and foreign status for very young dependents when other documents are unavailable.
• School records (for dependents under 14 or under 18 if a student): Acceptable for identity and foreign status for qualifying dependents.

Always verify the current IRS-accepted document list and the required combinations at IRS.gov before advising clients on what to bring. The IRS updates document requirements periodically, and certifying an insufficient document combination will result in rejection.

What a CAA Cannot Do

CAA authorization is substantial, but it has defined limits. Understanding these limits before you take on clients prevents errors that delay applications and damage client relationships.

• CAAs cannot certify documents for Exception 1(d) or Exception 3 applications. The IRS carves out specific exception categories in the W-7 instructions where CAA certification of documents is not permitted. Exception 1(d) (third-party withholding on passive income) and Exception 3 (US resident alien) applications require different documentation procedures. For any exception-category application, review the current W-7 instructions and IRS CAA program guidance at IRS.gov to confirm whether CAA certification of documents is permitted. Verify current IRS CAA program guidance at IRS.gov before submitting exception-category applications, as requirements for certain categories may have specific documentation rules.
• CAAs cannot certify documents for US citizens. US citizens are eligible for Social Security Numbers. A CAA cannot process an ITIN application for a US citizen, and a US citizen is not eligible to receive an ITIN.
• CAAs cannot certify documents they have not personally examined in original form. Certification based on photocopies, scans, or digital images is not permitted. You must physically examine the original document.
• CAAs are not authorized to represent clients before the IRS simply by virtue of their CAA status. Representation rights come from a separate credential: a valid power of attorney (Form 2848 for enrolled agents, CPAs, and attorneys) or a tax information authorization (Form 8821). See our guides on Form 2848 and Form 8821 and on the EA credential if you want to add representation rights to your practice.

Adding ITIN Services to Your Practice?

TaxWise supports ITIN returns. ATP is the IRS-authorized platform behind it. If you are building out ITIN preparation services as a CAA, contact ATP to discuss how TaxWise handles ITIN filer returns and what it takes to get set up.

The Commercial Case for Adding ITIN Services

The ITIN market is underserved in most geographic markets, and the practical barriers to entry (the training requirement and the application process) thin the competitive field in a way that the standard 1040 market never does. For a PTIN holder already running a tax practice, CAA status adds a distinct capability that most local competitors do not have.

Year-Round Revenue, Not Just Filing Season

ITIN applications come in year-round, not just during the January-April rush. A foreign investor closing on US real estate in September needs an ITIN before they can satisfy FIRPTA obligations. A new international student arriving in August needs one before their scholarship income is taxed correctly. This creates a demand pattern that complements a standard filing-season business rather than competing with it for your time and attention.

Client Retention and Long-Term Relationships

A client who comes to you for ITIN assistance is typically a client for years. Foreign nationals and immigrant families often stay with a preparer who understood their situation from the beginning. The complexity of their returns, which may involve foreign income, treaty positions, and multi-status years, also tends to mean higher fees and longer engagements than a straightforward W-2 return.

Referral Network Potential

ITIN clients refer. A foreign national family with a US tax obligation knows others in the same situation. Community organizations, immigrant services groups, university international offices, and real estate professionals working with foreign buyers all make natural referral partners for a CAA. These referral networks take time to build, but they generate a steady pipeline of clients that most of your competitors, who do not hold CAA status, cannot access.

Differentiation in a Commoditized Market

In a market where most independent preparers offer the same basic services, CAA status is a real differentiator. It appears on the IRS CAA directory, which drives inbound leads. It signals to clients that your practice has invested in specialized training. And it solves a problem, the document mailing risk, that clients genuinely care about. No marketing claim produces the same effect as removing a concrete inconvenience from the client experience.

TaxWise, ITIN Returns, and ATP

TaxWise, the professional tax preparation software ATP resells, supports ITIN filer returns. ITIN returns require specific handling: the return must include a valid ITIN (or a W-7 application submitted with the return), and the software must handle the entry and validation correctly to avoid IRS rejection.

For preparers building an ITIN practice, having software that handles these returns accurately matters. An error in ITIN entry or in the coordination between the W-7 and the accompanying return is a common source of processing delays. TaxWise's professional-grade form support and IRS-tested transmission path reduce that risk.

ATP is an IRS-authorized e-file transmitter and authorized CCH TaxWise reseller serving independent preparers and small offices since 2001. If you are preparing to add ITIN services as a CAA and want to understand how TaxWise handles ITIN filer returns, contact ATP directly. You can also review the broader credential and practice setup resources in our guides section:

• How to Get a PTIN (prerequisite for the CAA application)
• How to Get an EFIN (required to e-file client returns)
• Form 2848 vs. Form 8821 (representation and information authorization)
• EA Exam 2026 (full representation rights across all tax matters)
• Tax Office Setup Checklist (practice setup from credentials to software)

Frequently Asked Questions About Becoming a CAA