An Individual Taxpayer Identification Number (ITIN) is a nine-digit number issued by the IRS to individuals who are not eligible for a Social Security Number but have a US tax filing requirement. For Canadians and other non-residents, an ITIN is required to file Form 1040-NR, claim treaty-reduced withholding rates, file for a FIRPTA withholding certificate, or report US rental income. Without an ITIN, the IRS cannot process your return and payers must withhold at the full 30% rate.
The Form W-7 application process is straightforward in concept but frequently rejected in practice due to incorrect exception codes, missing documentation, or improper document certification. This guide walks through the complete process for Canadians applying for an ITIN. TYM is a Certifying Acceptance Agent (CAA) authorized by the IRS to certify identity documents — which means you do not need to mail your passport. Learn more about our [ITIN application service](/services/cross-border-tax/itin-application).
Who Needs an ITIN
You need an ITIN if you are a non-resident alien who: (1) has US-source income subject to withholding (rental income, dividends, royalties, wages); (2) is required to file a US tax return (Form 1040-NR); (3) wants to claim a reduced withholding rate under a tax treaty; (4) is filing for a FIRPTA withholding certificate (Form 8288-B) when selling US real estate; or (5) is a non-resident spouse being claimed on a US resident's joint return.
You do not need an ITIN if you are eligible for a Social Security Number. If you have authorization to work in the US, apply for an SSN instead.
The Form W-7 Application
Form W-7 asks for your name, mailing address, foreign address, date and country of birth, foreign tax identification number, and the reason for applying (Exception 1 through Exception 5, or the general rule). Selecting the correct exception is critical — the wrong exception is the most common reason ITIN applications are rejected.
The most common exception for Canadians is Exception 1 (passive income — dividends, interest, royalties, pensions) or the general rule (filing a US tax return). If you are applying to claim treaty-reduced withholding on Canadian-source income paid by a US payer, Exception 1 applies and you do not need to attach a US tax return to the W-7.
Document Requirements
The IRS requires original identity documents or certified copies from the issuing agency. A passport is the only document that satisfies both identity and foreign status requirements on its own. Other combinations are accepted (e.g., national ID card + birth certificate + visa), but a passport is the simplest approach.
If you submit original documents, the IRS will return them by mail — but this process takes 60+ days and carries the risk of loss in transit. The safer approach is to use a Certifying Acceptance Agent (CAA), who can certify your documents in person or via video call without requiring you to mail originals.
Using a Certifying Acceptance Agent
A Certifying Acceptance Agent is an individual or organization authorized by the IRS to assist applicants in obtaining ITINs. CAAs review the applicant's original documents, certify copies, and submit the application to the IRS ITIN unit. The advantage is that you keep your original documents — the CAA's certification substitutes for the originals.
TYM is a Certifying Acceptance Agent. We conduct identity verification via video call for Canadian clients and submit the application directly to the IRS. The IRS processes ITIN applications in 7–11 weeks.
After Your ITIN Is Issued
Once your ITIN is issued, you should: (1) provide it to any US payers who have been withholding at the 30% default rate, so they can apply the correct treaty rate going forward; (2) file any pending US tax returns using the ITIN; and (3) keep the ITIN active by using it on a US federal tax return at least once every three years (ITINs expire after three consecutive years of non-use).
If you need an ITIN for a specific transaction (e.g., a real estate closing), [contact TYM](/get-free-consultation) well in advance — the 7–11 week processing time means you should apply at least 3 months before your deadline.
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