“An ITIN rejection is rarely about one big error. It’s almost always a small mismatch — a missing letter, an outdated document, the wrong exception code — that could have been caught before submission.”
Why ITIN Mistakes Are So Common Among Canadian Applicants
Canadians applying for an ITIN are in a slightly unusual position. You’re a foreign national from the IRS’s perspective, but you’re also part of one of the most integrated cross-border economies in the world — working with U.S. clients, sitting on U.S. boards, investing in U.S. property, or earning royalties from U.S. companies. The IRS’s instructions for Form W-7 weren’t written with this everyday cross-border reality in mind, and that gap is where most mistakes happen.
Whether you’re in Toronto, Ottawa, Mississauga, or anywhere else in Ontario, or applying from British Columbia, Alberta, Quebec, or Atlantic Canada, the requirements are the same — and so are the pitfalls.
The Most Common ITIN Mistakes We See
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Submitting a passport alone, without supporting documentation
A Canadian passport confirms identity and foreign status, but many applications also require documents tied directly to the reason for applying — such as a contract with a U.S. payer, a withholding statement, or proof of the underlying U.S. income. A passport by itself is often not enough.
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Checking the wrong exception box on Form W-7
Form W-7 asks applicants to select the specific reason — or “exception” — for needing an ITIN. Selecting the wrong exception, or leaving the required explanation blank, is one of the fastest ways to have an application returned unprocessed.
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Submitting a U.S. tax return without the documents the IRS expects to see with it
Many ITIN applications are filed alongside a U.S. federal tax return. If the return and the W-7 don’t align — mismatched names, missing schedules, or income that isn’t clearly documented — the IRS can reject both.
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Using expired or non-certified copies of identity documents
The IRS requires either original documents or copies certified by the issuing agency or an authorized Certifying Acceptance Agent. Photocopies, notarized copies from a non-authorized notary, or expired documents are common reasons for rejection.
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Missing or inconsistent proof of Canadian residency
Applicants claiming benefits under the Canada–U.S. Tax Treaty must often demonstrate Canadian residency. Inconsistent addresses across your W-7, supporting letters, and identity documents can raise red flags and slow down processing.
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Applying too early — or too late
An ITIN application generally needs to be tied to an actual, current tax filing requirement. Applying before there’s a qualifying reason, or waiting until a filing deadline is days away, both create unnecessary risk.
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Mailing original documents directly to the IRS
Applicants who don’t work with a Certifying Acceptance Agent often have no choice but to mail original passports and other identity documents to the IRS — documents that can take months to be returned, and that are occasionally lost in transit.
What a Rejection or Delay Actually Costs You
ITIN processing already takes six to fourteen weeks under normal circumstances, and longer during peak season. A returned or rejected application means starting the clock over — often while U.S. withholding continues to apply to your income at the maximum rate, or while a filing deadline draws closer. For Canadians in Toronto and Ontario relying on treaty benefits, or waiting on payments held pending an ITIN, that delay has a real, measurable financial impact.
How Canadians Can Avoid These Mistakes
The single most effective way to avoid an ITIN delay or rejection is to work with an IRS-authorized Certifying Acceptance Agent (CAA). A CAA reviews your original documents in person, certifies copies on the IRS’s behalf, and prepares your Form W-7 with the correct exception and supporting narrative — so your original passport never has to leave the country, and your application is reviewed for accuracy before it’s ever submitted.
For Canadians across Toronto, Ontario, and the rest of Canada, this one step eliminates the majority of the mistakes outlined above, and replaces months of uncertainty with a clear, guided process.