Tax & Compliance · 2026-04-13
How to Apply for an ITIN as a Non-Resident LLC Owner: Timeline, Documents, and Common Rejections
Applying for an ITIN involves Form W-7, passport certification, and a supporting tax return. The process takes 7 to 14 weeks depending on your method. Here is how CAA, direct, and attach-to-return applications compare, what causes rejections, and what address goes on the W-7.
Disclaimer: This article is for educational purposes only. It does not constitute tax advice. Consult a qualified tax professional for your specific situation.
What an ITIN Is and Why You Need One
An Individual Taxpayer Identification Number (ITIN) is a tax processing number issued by the IRS to individuals who have a US tax obligation but are not eligible for a Social Security Number. If you are a non-US person who owns a single-member LLC, you likely need an ITIN to file your annual Form 5472 and pro forma Form 1120.
The ITIN is a 9-digit number formatted like an SSN (9XX-XX-XXXX) but beginning with the digit 9. It does not authorize work in the US. It does not grant immigration status. It exists solely for federal tax identification purposes.
For a deeper comparison of ITIN, SSN, and EIN, see What Is an ITIN: SSN vs ITIN vs EIN Differences.
Three Ways to Apply for an ITIN
There are three application methods. Each has different document requirements, processing times, and risk profiles.
Method 1: Certifying Acceptance Agent (CAA)
A CAA is an individual or organization authorized by the IRS to verify your identity documents on the IRS's behalf. When you use a CAA:
You present your original passport to the CAA in person
The CAA examines and certifies your documents
The CAA submits your W-7 application to the IRS
You keep your original passport (the CAA sends certified copies, not originals)
Typical timeline: 7 to 9 weeks from submission to ITIN issuance.
The primary advantage of using a CAA is that you never mail your original passport to the IRS. The CAA certifies copies, which the IRS accepts in lieu of originals.
CAAs charge a fee for their service, typically $150 to $400 depending on location and complexity. Some CPAs who specialize in international tax are also CAAs, which streamlines the process since the same professional can prepare your tax return and submit your W-7.
Method 2: Direct Application to the IRS
You can submit Form W-7 directly to the IRS by mail. This requires either:
Mailing your **original passport** to the IRS (they return it after processing), or
Mailing a **certified copy** of your passport from the issuing agency (not a regular notarized copy)
Typical timeline: 11 to 14 weeks from mailing to ITIN issuance.
The risk with direct application is the extended period your original passport is in transit and at the IRS. While the IRS does return passports, the process can take the full 14 weeks. If you need your passport for travel during this period, direct application is not advisable.
You can also apply in person at an IRS Taxpayer Assistance Center (TAC) that processes W-7s. This eliminates the need to mail your passport, but TAC locations are limited and appointments can be difficult to schedule. Not all TAC offices process ITIN applications — verify before visiting.
Method 3: Attach to Tax Return
You can submit Form W-7 attached to the federal tax return that requires the ITIN. For single-member LLC owners, this means attaching the W-7 to your pro forma Form 1120 with Form 5472.
Typical timeline: 11 to 14 weeks, same as direct application.
The advantage is that your tax return and ITIN application are processed together. The disadvantage is the same: you need to mail original documents or certified copies, and the combined processing can extend timelines further if the IRS encounters issues with either the W-7 or the return.
Passport Certification Options
The passport requirement is the biggest logistical challenge for non-US applicants. Here are your options:
Original passport by mail. The IRS accepts your original passport as identity proof. They process and return it. This is the simplest but riskiest option, as your passport will be unavailable for 11-14 weeks.
Certified copy from issuing country. Some countries' passport agencies or consulates can issue a certified copy of your passport. The IRS accepts these if they come from the original issuing authority (not a third-party notary). Check with your country's passport office whether they provide this service.
US Embassy or Consulate certification. You can visit a US Embassy or Consulate in your country to have your passport certified. The embassy staff will review your original passport and provide a certified copy that the IRS accepts. This typically costs $50 and requires an appointment.
Certifying Acceptance Agent (CAA). As described above, a CAA can certify your passport documents, eliminating the need to mail originals. The CAA must physically examine your original documents in person.
What Goes on Form W-7
Form W-7 is a one-page form (plus instructions). Your CPA or CAA will complete it, but you should understand what information is required:
**Your legal name** as it appears on your passport
**Your foreign address** (complete, including country and postal code)
**Your US address** (if applicable — this is where the ITIN letter will be mailed if you provide one)
**Your date and country of birth**
**Your foreign tax identification number** from your home country
**The reason you need an ITIN** (checked box for the applicable exception)
**The tax return** the ITIN is being requested for
The address on your W-7 matters. The IRS will mail your ITIN assignment letter (CP 565) to the address you provide. If you list a foreign address, the letter goes internationally, which adds delivery time and risk. If you have a US address — such as your LLC's physical business address — listing it as your mailing address on the W-7 can ensure faster, more reliable delivery of your ITIN letter.
Supporting Tax Return Requirement
The IRS does not issue ITINs without a federal tax purpose. When you apply, you must demonstrate why you need the ITIN by either:
1. Attaching a federal tax return that requires the ITIN (most common: pro forma Form 1120 with Form 5472)
2. Claiming an exception under one of the IRS-recognized categories
For single-member LLC owners filing Form 5472, you are applying based on the requirement to file a federal tax return. Your W-7 will reference the attached or separately filed return.
If you apply without a supporting tax return or valid exception, the IRS will reject your application. This is one of the most common reasons for W-7 rejection.
Common Reasons for ITIN Rejection
The IRS rejects a significant number of W-7 applications. Understanding the common causes helps you avoid them:
No supporting tax return. Applying for an ITIN "just to have one" without a tax filing purpose will result in rejection. You must have a current tax obligation.
Incomplete W-7 form. Missing fields, unsigned form, or inconsistent information between the W-7 and the attached return triggers rejection.
Incorrect address format. Foreign addresses must follow the IRS format. Missing postal codes, incorrect country names, or formatting that does not match your passport address can cause issues.
Filing outside of tax season without clear reason. If you submit a W-7 outside the January-April filing season without an attached current-year return or a clear reason for the off-season filing, the IRS may question the application.
Passport copy not properly certified. Regular notarized copies are not accepted. The certification must come from the issuing agency, a US Embassy, or a CAA. A local notary public stamp is insufficient.
Previously issued ITIN that expired. If you had an ITIN that expired due to non-use (ITINs not used on a federal return for three consecutive years expire), you need to renew, not reapply. The renewal process uses the same Form W-7 but follows a different procedure. For renewal details, see ITIN Renewal and Address Change Guide.
Mismatch between W-7 name and passport name. If your passport shows a different name format (e.g., family name first in some Asian passports), ensure the W-7 matches your passport exactly.
Timeline Comparison
Here is a realistic timeline for each method based on 2025-2026 processing:
CAA Application:
Document preparation: 1-2 weeks
CAA appointment and certification: 1 day
CAA submits to IRS: 1-3 days
IRS processing: 6-8 weeks
ITIN letter delivery: 1-2 weeks
**Total: approximately 7-9 weeks**
Direct Mail Application:
Document preparation: 1-2 weeks
Mail passport and W-7 to IRS: 1-2 weeks
IRS processing: 9-11 weeks
Passport return mail: 1-2 weeks
ITIN letter delivery: 1-2 weeks
**Total: approximately 11-14 weeks**
Attach to Return:
Tax return preparation: 1-3 weeks
Mail return with W-7 and passport: 1-2 weeks
IRS processing (return + ITIN): 9-14 weeks
Passport return mail: 1-2 weeks
**Total: approximately 11-14 weeks (can extend to 16+ weeks)**
These timelines assume no rejections or requests for additional information. If the IRS sends a notice requesting corrections, add 4-8 weeks to any of these timelines.
ITIN Address Considerations
The address you use on your W-7 has implications beyond just receiving the ITIN letter:
Future IRS correspondence. The address on your ITIN application becomes the address associated with your ITIN in IRS records. Future correspondence — notices, letters, requests — will go to this address unless you file an address change.
Tax return consistency. The address on your annual tax returns should match the address the IRS has on file for your ITIN. Mismatches between your W-7 address and subsequent return addresses can trigger processing delays.
Physical US address advantage. If you have a legitimate US business address (such as through a sublease for your LLC), using it as your mailing address on the W-7 provides faster delivery and a consistent US address across all tax filings. For details on what the IRS accepts and rejects as an address, see ITIN Address Requirements: What the IRS Accepts and Rejects.
Cost Breakdown
The ITIN application itself has no IRS fee. However, the associated costs include:
**CAA fee**: $150 to $400
**US Embassy passport certification**: approximately $50
**CPA fee for tax return preparation** (required to support the W-7): $300 to $800 for Form 5472 filing
**Shipping costs** (if mailing original passport): $30 to $80 for tracked international shipping each way
Total cost using a CAA who is also your CPA: approximately $450 to $1,200 including the tax return preparation.
Total cost using direct mail: approximately $360 to $960 (CPA fee + shipping, no CAA fee).
What to Do After Receiving Your ITIN
Once you receive your ITIN assignment letter (CP 565):
1. Store it securely. This is a tax identification document. Treat it with the same care as a Social Security card.
2. Provide it to your CPA for all future tax filings.
3. Use it consistently on all federal tax returns. An ITIN not used on a return for three consecutive tax years will expire.
4. Do not use it for non-tax purposes. The ITIN is not valid for employment verification, Social Security benefits, or immigration status.
5. Update your address with the IRS if you move, using Form 8822.
Key Deadlines for Tax Year 2025
For tax year 2025 filing:
**Form 5472 + pro forma 1120 deadline**: April 15, 2026
**Automatic extension** (with Form 7004): October 15, 2026
**ITIN application**: submit as early as possible to receive the ITIN before the return deadline
If you are applying for an ITIN for the first time and attaching it to your tax return, the return filing and ITIN application are submitted together. If you already have an ITIN, verify it has not expired before filing. For a complete calendar of foreign-owned LLC deadlines, see Tax Calendar for Foreign-Owned Wyoming LLC.
Disclaimer: This article is for educational purposes only. It does not constitute tax advice. Consult a qualified tax professional for your specific situation.