Do I need to mail my passport if I use a CAA?

No. This is the primary advantage of using a CAA. When you apply through a Certifying Acceptance Agent, they verify your original passport (in person or through their secure remote process) and create certified copies. The IRS accepts these certified copies in place of original documents. You keep your passport throughout the entire 7 to 11 week IRS processing period. If you apply directly by mail without a CAA, you must send your original passport to the IRS.

How much does a CAA charge compared to applying directly with the IRS?

The IRS charges $0 for the ITIN regardless of how you apply. CAA service fees range from $297 to $500 depending on the provider. At itin.so, Standard service is $297 and Express is $297. Direct mail application costs only postage ($20 to $50 for international registered mail), but carries the risk of passport loss and higher rejection rates. The true cost of a rejected DIY application includes 3 to 5 additional months of waiting and potential resubmission fees.

Is the rejection rate lower when applying through a CAA?

Yes. CAA-prepared applications have a lower rejection rate because the agent reviews all documents and the W-7 form for completeness and accuracy before submission. Common rejection causes like missing signatures, wrong reason-for-applying codes, name mismatches, and insufficient documentation are caught during the preparation phase. The IRS does not publish official rejection rate statistics by submission method, but CAA industry data consistently shows pre-verified applications are rejected less frequently than self-prepared mailings.

Can a CAA speed up IRS processing of my ITIN application?

No. The IRS processing window is 7 to 11 weeks regardless of whether you apply through a CAA or directly. No individual or organization can expedite IRS processing. What a CAA does speed up is the preparation phase: your application is prepared, verified, and submitted faster and more accurately. This reduces the chance of rejection, which would otherwise add 3 to 5 months to your total timeline. The fastest total timeline is with itin.so Express: 2 to 3 business day preparation plus 7 to 11 weeks IRS processing.

How do I verify that a CAA is authorized by the IRS?

The IRS maintains a list of authorized Acceptance Agents searchable at IRS.gov. You can also call the IRS at 1-800-829-1040 to verify a specific CAA's authorization. Ask any service claiming CAA status for their IRS authorization details. Legitimate CAAs will readily provide this information. Be cautious of services that claim to be CAAs but cannot provide verification. itin.so is an IRS-authorized Certifying Acceptance Agent serving applicants from over 150 countries.

Can I use a CAA from outside the United States?

Yes. CAAs can serve applicants from any country. The document verification and certification process can be completed remotely through secure document submission. At itin.so, we serve applicants from over 150 countries. You upload your documents through our secure system, we verify and certify them, prepare your W-7, and submit everything to the IRS. There is no requirement to be physically present in the US at any point.

What happens if my CAA-prepared application is still rejected?

If the IRS rejects your application despite CAA preparation, the CAA should review the rejection reason (stated on IRS Notice CP567), correct any issues, and resubmit. At itin.so, we offer a 100% money-back guarantee: if the IRS declines your application, you receive a full refund. You can also choose to have us correct and resubmit at no additional cost. Rejection reasons are typically specific and fixable: missing information, document issues, or reason-for-applying questions.

Can I visit an IRS Taxpayer Assistance Center instead of using a CAA?

Yes. There are approximately 370 IRS Taxpayer Assistance Centers (TACs) across the United States where you can submit your ITIN application in person. You bring your original documents, the agent verifies them on the spot, and you leave with your originals. However, TACs require in-person visits (you must be in the US), appointments must be scheduled in advance, wait times are long during tax season, and availability varies by location. For international applicants, a TAC visit is often impractical. A CAA offers the same document verification benefit remotely.

CAA vs IRS Direct ITIN Application: Which Is Better in 2026?

Q: Is there a difference between an Acceptance Agent and a Certifying Acceptance Agent?

Yes. There are 2 levels. An Acceptance Agent (AA) can help prepare W-7 forms and submit applications, but cannot certify documents. Your original documents must still go to the IRS. A Certifying Acceptance Agent (CAA) has additional authorization to verify and certify identity documents, meaning you keep your originals. Always confirm your agent is a CAA (not just an AA) if keeping your passport is important to you. itin.so operates as a Certifying Acceptance Agent.

Updated April 2026

Direct answer: A Certifying Acceptance Agent (CAA) is better for most applicants. CAAs offer 3 key advantages: you keep your passport instead of mailing it to the IRS for 7 to 11 weeks, your application is pre-verified to reduce rejection risk, and you can complete everything remotely from any country. The trade-off is a service fee ($297 to $500 depending on the provider). Direct IRS application by mail costs only postage but requires surrendering your original passport. Below: full comparison of both methods with costs, timelines, and risk factors.

What Are the 3 Ways to Submit an ITIN Application?

The IRS accepts ITIN applications through 3 channels. Each has different requirements, costs, and risk levels.

Method 1: Mail your application directly to the IRS. Download Form W-7 from IRS.gov, complete it yourself, and mail it with your original passport (or a certified copy from the issuing government) to the IRS ITIN Operation center at P.O. Box 149342, Austin, TX 78714-9342. Cost: postage only ($20 to $50 international registered mail). Risk: highest rejection rate, passport surrendered for 7 to 11+ weeks.

Method 2: Visit an IRS Taxpayer Assistance Center (TAC) in person. Approximately 370 TACs operate across the United States. You bring your documents, an IRS agent verifies them on the spot, and you leave with your originals. Cost: free (plus travel to the US). Limitation: you must physically be in the United States.

Method 3: Use a Certifying Acceptance Agent (CAA). A CAA verifies and certifies your documents, prepares your W-7, and submits everything to the IRS. You keep your passport. Cost: $297 to $500. Best for: international applicants who cannot or prefer not to visit the US. Learn more about the full CAA process in our 2026 ITIN application guide.

Why Do CAA Applications Have Lower Rejection Rates?

CAAs are trained by the IRS specifically for ITIN applications. They know the 4 most common rejection causes and check for them before submission: incomplete W-7 forms (missing fields, unsigned forms), wrong reason-for-applying codes, name mismatches between the W-7 and identity documents, and insufficient or expired documentation.

A self-prepared application has no pre-review. The first person to examine your W-7 is an IRS agent in Austin, Texas, weeks after you mailed it. If anything is wrong, the IRS mails a rejection notice (CP567) and you start over. That restart adds 3 to 5 months to your timeline. A CAA catches these errors before submission, saving you months of delays and the stress of reapplication.

How Does the Passport Issue Affect Your Decision?

When you mail your ITIN application directly to the IRS, you must include your original passport or a certified copy from the issuing country (not a notarized copy). The IRS holds your passport for the full 7 to 11 week processing period, plus mail transit time. Total time without your passport: 9 to 15 weeks.

For the approximately 4.4 million active ITIN holders worldwide, most of whom are international residents, going 2 to 4 months without a passport is not practical. You cannot travel internationally, and in many countries, your passport serves as your primary identification for banking, contracts, and government services. This single issue drives most applicants to choose the CAA route. At itin.so, our CAA certification means your passport never leaves your hands.

Keep your passport. Use a Certifying Acceptance Agent.

itin.so is an IRS-authorized CAA. Standard $297 or Express $297. 100% money-back guarantee.

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What Is the Cost Comparison Between CAA and Direct Application?

Factor	Direct Mail (DIY)	IRS TAC (In-Person)	CAA (itin.so)
IRS fee	$0	$0	$0
Service/travel cost	$20 to $50 (postage)	$500 to $2,000+ (travel)	$297
Keep passport	No	Yes	Yes
Pre-verification	None	At appointment	Full review before submission
Must be in US	No	Yes	No
Money-back guarantee	N/A	N/A	Yes, 100%

What Is the Difference Between an Acceptance Agent and a Certifying Acceptance Agent?

The IRS has 2 tiers of authorized agents. An Acceptance Agent (AA) can assist with W-7 preparation and submit applications, but cannot certify identity documents. You must still send your original passport to the IRS or visit a TAC. A Certifying Acceptance Agent (CAA) has additional authorization to verify and certify your identity documents, creating certified copies the IRS accepts in place of originals.

Always confirm you are working with a CAA, not just an AA, if keeping your passport is a priority. itin.so operates as a Certifying Acceptance Agent, providing the highest level of document certification available in the ITIN application process. Compare ITIN services in our 2026 ITIN services comparison.

Who Should Apply Directly to the IRS Without a CAA?

Direct mail application makes sense in 3 narrow situations: you have a second valid passport and can afford to mail one for 7 to 11 weeks, you are already in the US and can visit a Taxpayer Assistance Center in person, or you are an experienced tax professional preparing your own W-7. For everyone else, the CAA route provides better value through document security, lower rejection risk, and remote accessibility.

Even applicants who could visit a TAC often choose a CAA instead. TAC appointments are limited, wait times during tax season can be hours, and not all TACs handle ITIN applications. A CAA provides a dedicated, predictable process with clear timelines and direct communication throughout. For the full online vs mail comparison, read our online vs mail ITIN application guide.

How Does the CAA Process Work Step by Step?

The CAA process through itin.so follows 5 steps. Step 1: Start your application online at itin.so/apply and choose Standard ($297) or Express ($297). Step 2: Upload your passport and supporting documents through our secure system. Step 3: Our CAA team verifies your identity, certifies your documents, and prepares your W-7 form. Step 4: We submit your complete, pre-verified application package to the IRS ITIN Operation center. Step 5: The IRS processes your application (7 to 11 weeks) and mails your CP565 notice with your ITIN. We track the status and notify you via WhatsApp at each stage.

Government Sources

This guide references IRS Publication 1915, IRC Section 1.6109-1, the IRS Acceptance Agent Program guidelines, IRS Form W-7 Instructions, and IRS Taxpayer Assistance Center locator data. Processing times are based on the IRS stated 7 to 11 week window. All information is current as of April 2026.

CAA vs IRS Direct Application: Frequently Asked Questions

A Certifying Acceptance Agent (CAA) is an individual or organization authorized by the IRS under IRC Section 1.6109-1 to verify identity documents and certify them for ITIN applications. CAAs complete a formal application process with the IRS, pass background checks, and receive specific training on ITIN procedures. There are approximately 400 active CAAs in the United States. A CAA can verify your passport remotely, certify copies, prepare your W-7 form, and submit everything to the IRS on your behalf.

Apply Through an IRS-Authorized CAA

Keep your passport. Lower rejection risk. Remote from 150+ countries. Standard: $297. Express: $297. 100% money-back guarantee.

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