How to Get an ITIN Number in 2026: Step-by-Step Guide
To get an ITIN number in 2026, you need to complete IRS Form W-7, gather your identity documents (passport is the easiest), and submit your application to the IRS. The fastest method is using an IRS-authorized Acceptance Agent who can certify your documents so you don't need to mail your original passport. The entire process takes 7 to 11 weeks when you mail directly to the IRS, but working with a professional service can speed up the preparation phase to just 2-3 business days.
What You Need to Apply for an ITIN
Before you apply for an ITIN, make sure you have three things ready: a completed IRS Form W-7, valid identity and foreign status documents, and a federal tax return (unless you qualify for an exception). The IRS is strict about all three, and a missing signature or an outdated passport will get your application rejected.
Here is a quick overview of what you need:
- IRS Form W-7: the official ITIN application form. Every applicant must complete one.
- Identity documents: a valid passport is the simplest option. It proves both identity and foreign status in a single document.
- Federal tax return: typically attached to your W-7 unless you qualify for one of the IRS exceptions (such as third-party withholding or tax treaty benefits).
- Reason for applying: you must select the correct reason on Form W-7 (e.g., filing a tax return, claiming a treaty benefit, or being a dependent or spouse of a visa holder).
For a full breakdown of eligibility criteria, read our guide on ITIN requirements and eligibility.
Step 1: Determine Your Eligibility
Not everyone qualifies for an ITIN. The IRS issues ITINs to individuals who have a US federal tax filing or reporting obligation but are not eligible for a Social Security Number. This includes:
- Non-resident aliens filing a US tax return: if you earned income in the US (such as rental income, investment dividends, or freelance payments) and need to file a federal return.
- Spouses or dependents of US citizens or residents , if you are being claimed on someone else's tax return for credits or deductions.
- Non-resident aliens claiming a tax treaty benefit , if your country has a tax treaty with the US and you need an ITIN to claim reduced withholding rates.
- Foreign nationals with US-source income subject to withholding , including bank interest, royalties, pensions, annuities, or scholarship/fellowship grants.
- Non-resident members of a US partnership, if the partnership allocates income to you and needs to file reporting documents.
If you already have a Social Security Number, or are eligible for one, you cannot apply for an ITIN. The two numbers are mutually exclusive.
Step 2: Gather Required Documents
The IRS requires original documents or certified copies from the issuing agency. Notarized copies are not accepted. Your documents must prove both your identity and your foreign status.
The easiest option is a valid passport. A passport is the only standalone document that satisfies both the identity and foreign status requirements. If you use any other document, you will need at least two: one to prove identity and one to prove foreign status.
Alternative documents include:
- National identification card (must show photo, name, current address, date of birth, and expiration date)
- US or foreign driver's license
- Birth certificate (required for dependents under 18)
- Foreign voter's registration card
- US military identification card
- Foreign military identification card
- US state identification card
- Civil birth certificate (for dependents under 18 if the passport does not have the date of entry)
- Medical records (dependents under 6 only)
- School records (dependents under 18, under 6 for medical records)
- US visa issued by the Department of State
- US Citizenship and Immigration Services (USCIS) photo identification
We strongly recommend using your passport whenever possible. It eliminates the need for multiple documents and reduces the risk of rejection. For a complete list, see our guide on documents required for ITIN.
Step 3: Complete Form W-7
IRS Form W-7 is the official application for an Individual Taxpayer Identification Number. It is a two-page form that asks for your personal information, the reason you need an ITIN, and details about your identity documents.
Key sections of Form W-7:
- Line 1a-1b: Your legal name exactly as it appears on your tax return. If your name has changed, enter your birth name on line 1b.
- Line 2: Your foreign mailing address. The IRS will send your ITIN assignment letter here, so make sure it is accurate and complete.
- Line 3: Your US address, if applicable. This applies to applicants who have a US mailing address or have previously filed from a US address.
- Line 4: Date of birth in MM/DD/YYYY format.
- Line 5: Country of citizenship.
- Line 6a: Your foreign tax identification number, if you have one.
- Line 6d: The reason you are applying. This is critical, and selecting the wrong reason is a common cause of rejection.
- Signature: You must sign and date the form. An unsigned W-7 will be automatically rejected.
Mistakes on Form W-7 are the single biggest cause of ITIN application rejections. Common errors include leaving fields blank, entering a name that does not match your passport, and selecting the wrong reason code on line 6d. For detailed, line-by-line instructions, read our guide on how to complete Form W-7.
Step 4: Choose How to Apply for an ITIN
There are three ways to submit your ITIN application to the IRS. Each method has trade-offs in speed, convenience, and document handling.
Method A: Through a Certifying Acceptance Agent (CAA)
A Certifying Acceptance Agent is an individual or organization authorized by the IRS to verify your identity documents and submit your W-7 on your behalf. This is the fastest and most convenient method because the CAA certifies your passport, so you never need to mail or surrender the original.
- You keep your passport throughout the entire process
- The CAA reviews your documents for errors before submission
- Lower rejection rates because the application is professionally prepared
- Available remotely, so you do not need to visit anyone in person
Learn more about how this works in our IRS Certifying Acceptance Agent guide.
Method B: Mail to the IRS
You can mail your completed W-7, tax return, and original identity documents (or certified copies) directly to the IRS ITIN Operation center in Austin, Texas.
Internal Revenue Service
ITIN Operation
P.O. Box 149342
Austin, TX 78714-9342
- No professional fees, just postage costs
- You must mail original documents or certified copies from the issuing agency
- Documents are returned within 60-65 days after receipt
- Higher risk of rejection due to unreviewed forms
Warning: If you mail your original passport, you will be without it for up to 14 weeks. Use registered mail or a trackable courier service.
Method C: In-Person at an IRS Taxpayer Assistance Center (TAC)
If you are in the United States, you can visit an IRS Taxpayer Assistance Center to submit your application in person. The IRS agent will review your documents on-site and return them immediately.
- Documents are verified and returned on the spot
- You must schedule an appointment in advance
- Only available at select IRS offices, as not all TACs process ITINs
- Not practical for applicants living outside the US
Step 5: Submit and Wait
After submitting your application, the IRS will review your W-7 form, verify your identity documents, and process your federal tax return. If everything is in order, you will receive a CP565 notice in the mail containing your ITIN assignment.
The current processing timeline is 7 to 11 weeks from the date the IRS receives your application. During peak tax season (January through April), processing times tend toward the longer end of that range.
You can check the status of your application by calling the IRS ITIN hotline at 1-800-829-1040 (domestic) or 1-267-941-1000 (international). Be prepared to provide your name, mailing address, and date of birth for verification.
For a detailed breakdown of current wait times, read our guide on how long ITIN takes.
How Long Does It Take to Get an ITIN?
The answer depends on your submission method and the time of year. Here is what to expect for each method:
| Method | Preparation Time | IRS Processing | Total Time |
|---|---|---|---|
| CAA (Standard) | 7-10 business days | 7-11 weeks | 8-13 weeks |
| CAA (Express via itin.so) | 2-3 business days | 7-11 weeks | 7-12 weeks |
| Mail to IRS | Self-paced | 7-11 weeks | 7-11 weeks + mail time |
| In-Person (TAC) | Same day | 7-11 weeks | 7-11 weeks |
The IRS processing portion is the same regardless of how you submit. The difference is in how quickly your application gets prepared and submitted. Using a CAA with Express service gets your application to the IRS faster, which means you receive your ITIN sooner.
Common Reasons ITIN Applications Get Rejected
The IRS rejects thousands of ITIN applications every year. Most rejections are preventable. Here are the most frequent causes:
- Missing or incorrect information on Form W-7: blank fields, typos in your name, or a mismatch between your W-7 and your passport are the top reasons for rejection.
- No federal tax return attached: unless you qualify for a specific exception, your W-7 must be submitted with a completed federal tax return.
- Unsigned application: the IRS will reject any W-7 that is not signed and dated. This includes cases where a parent or legal guardian must sign on behalf of a minor.
- Expired passport or identity documents: all documents must be current and unexpired at the time of submission.
- Wrong reason code selected: line 6d on Form W-7 asks why you are applying. Selecting the incorrect reason (or leaving it blank) will trigger a rejection.
- Notarized copies instead of certified copies: the IRS only accepts original documents or copies certified by the issuing agency. Notarized copies from a third-party notary are not valid.
- Already eligible for an SSN: if the IRS determines you are eligible for a Social Security Number, your ITIN application will be denied.
- Duplicate application: if you already have an ITIN (even an expired one), you cannot apply for a new one. You must renew your existing ITIN instead.
Working with a professional service significantly reduces rejection risk. At itin.so, every application is reviewed by our team before submission, and our Express service includes a money-back guarantee if the IRS rejects an application due to a preparation error.
The Fastest Way to Get an ITIN Number
While IRS processing time (7-11 weeks) is outside your control, you can minimize the preparation phase. The fastest way to apply for an ITIN is through a Certifying Acceptance Agent with express preparation.
Our Express service at itin.so prepares your complete W-7 application in 2-3 business days. Here is what you get:
- Priority preparation: your application moves to the front of our queue and is prepared within 2-3 business days
- Expert document review: we review every page of your supporting documents for errors, inconsistencies, and missing information
- Certified document handling: we work with IRS-authorized partners to certify your passport so you never mail the original
- Direct WhatsApp support: get real-time answers from our team throughout the process
- Money-back guarantee: if the IRS rejects your application due to a preparation error on our part, you get a full refund
Ready to get started? Check out our Express ITIN service, 2-3 business days for pricing and details.
Frequently Asked Questions About Getting an ITIN
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