Most guides tell Canadians they need a US Individual Taxpayer Identification Number (ITIN) to lower their US tax. That is usually backwards. For ordinary US dividends, interest, or royalties, a W-8BEN with your Canadian Social Insurance Number is generally enough to claim the treaty rate at the source. You need a US ITIN at the moment you have to file a US return: to recover 30% withholding on a 1040-NR, to sell US real estate under FIRPTA, or to report US business income. According to the IRS, an ITIN is issued only to people who have a US federal tax filing or reporting requirement and are not eligible for a Social Security number (IRS, 2026). As a Certifying Acceptance Agent, I file these applications for Canadian clients every week. This guide shows you exactly when you need one and how to get it.
- A W-8BEN with your Canadian SIN usually secures the treaty rate at source. An ITIN becomes mandatory only when you must FILE a US return (a 1040-NR refund, a FIRPTA sale, or US business income).
- Canada is the only country whose residents can deduct US gambling losses against US gambling winnings under Article XXII(3) of the treaty, which makes the casino-winnings refund the single most common ITIN trigger I see from Canada.
- Do not confuse the Canadian ITN (CRA Form T1261) with the US ITIN (IRS Form W-7). They are different numbers from different governments. This guide is about the US IT
If you are new to the concept, our explainer on what an ITIN number is covers the basics, and how to get an ITIN is the general hub this Canada guide sits under.
ITN, ITIN, SIN, SSN: Which Number Do You Actually Mean?#
This is where most Canadians go wrong before they even start, so let us clear it up first.
If you searched for "ITN Canada" and you actually need the Canadian non-resident number, our separate guide on how to apply for a Canadian ITN is the one you want. This article is about the US ITIN, the nine-digit IRS number that starts with 9 and is formatted like an SSN. It does not grant work authorization or immigration status. It exists for one purpose: US tax compliance.
Do You Actually Need a US ITIN as a Canadian?#
The honest answer for a lot of Canadians is no, or not yet. The decision matrix I walk clients through looks like this. The rule underneath it is simple: a W-8BEN handles the source withholding, an ITIN handles the filing.
Two of those rows are where Canadians lose the most money and deserve a closer look: the casino refund and the FIRPTA sale.
How Does the Canada-US Tax Treaty Reduce Your US Tax?#
The Canada-United States Income Tax Convention has been in force since 1984 and has been updated by five protocols, the last in 2007 (IRS, 2026). It is the legal basis for almost every reduced rate a Canadian relies on. Most US-source income paid to a non-resident is hit with a 30% statutory withholding by default (IRS Pub 515, 2026). The treaty lowers that. Your paperwork is what unlocks it.
The chain that actually matters runs like this. You give your broker or payer a W-8BEN to certify you are a Canadian resident and claim the treaty rate. For most passive income, your Canadian SIN is an acceptable foreign tax number on that form, so the 30% drops to the treaty rate at the source and you are done. The payer reports the income on a Form 1042-S. The ITIN only becomes mandatory when you decide to file a Form 1040-NR, because the broker over-withheld, because you are reconciling a FIRPTA sale, or because you have income that must be reported on a return. No return, often no ITIN. A return, always an ITIN. For the deeper treaty mechanics on residency and tie-breakers, see our guide to the Canada-US tax treaty.
How Do Canadians Get the 30% Casino Tax Back?#
This is the most common reason Canadians come to me for an ITIN, and it is the one piece of genuinely good news in US tax law for Canadians.
When you hit a reportable jackpot at a US casino, the casino withholds 30% before you ever see the money and hands you a Form 1042-S. A slot or bingo win has long triggered a Form W-2G at $1,200 or more. For 2026 the IRS instructions set an inflation-adjusted minimum reporting threshold of $2,000, so confirm the current figure for your game on the live W-2G instructions before relying on it (IRS, Instructions for Forms W-2G and 5754, 2026). Not every game is withheld. Table games are treated very differently from machines.
The IRS confirms that a non-resident alien's winnings from blackjack, baccarat, craps, roulette, and big-6 wheel are not subject to withholding or reporting (IRS, 2026). So if the casino held back 30% of your slot jackpot, you may be able to get a chunk of it back, and this is where Canada is uniquely lucky.
Under Article XXII(3) of the treaty, Canadian residents can deduct US gambling losses against US gambling winnings on a 1040-NR (IRS Pub 597 and Topic No. 419, 2026). No other treaty gives its residents that. A worked example makes it concrete.
Say you win $10,000 on a slot machine. The casino withholds $3,000 and gives you a 1042-S. Over that same year you also lost $8,000 at US casinos and kept your play records. On a 1040-NR you report $10,000 of winnings and deduct $8,000 of losses, leaving $2,000 taxable. The US tax on that is roughly $600, so your refund is about $2,400 of the original $3,000. You cannot file that 1040-NR without an ITIN.
That $2,400 is an illustration, not an IRS figure, and your real number depends on your own wins, losses, and records. The casino cannot issue your ITIN at the cage in most cases, and you generally have three years from the end of the tax year to file the claim. A contingency-fee refund industry exists around this, but all they are doing is what a CAA does: getting you an ITIN and filing the 1040-NR.
Selling US Property: FIRPTA and Why the ITIN Is Non-Negotiable#
If you are a Canadian selling a US home, condo, or land, FIRPTA is the rule that catches almost everyone by surprise. When a foreign person disposes of a US real property interest, the buyer must withhold 15% of the total sale price, not the profit, and send it to the IRS (IRS, FIRPTA Withholding, 2026). On a $500,000 sale that is $75,000 held back, often far more than the actual tax on your gain.
There are two ways to deal with it, and both require an ITIN. You can apply for a withholding certificate on Form 8288-B before or at closing to reduce the amount held to your expected actual tax, and you must file a 1040-NR after the sale to report the real gain and reclaim the excess using the Form 8288-A credit (IRS, ITIN guidance for property buyers and sellers, 2026). The 15% rate drops to zero when the sale price is $300,000 or less and the buyer will use the property as a residence, and falls to 10% on a residence sold for $300,001 to $1,000,000. None of those filings are possible without an ITIN, which is why I tell Canadian sellers to start the W-7 the moment the property is listed, not after closing.
What Documents Do You Need for Form W-7 from Canada?#
For Canadians, your passport is the single most important document. The IRS accepts a valid passport as the only standalone item that proves both your identity and your foreign status, so you usually do not need to assemble a second document (IRS, 2026).
A complete package from Canada typically includes three things.
Your Canada Passport#
A current, valid Canadian passport, either the original or a copy certified through one of the three paths in the next section. This is the cornerstone of the application. Form W-7 asks for your passport number, issue and expiry dates, and issuing country.
A Completed Form W-7#
Form W-7 is the ITIN application itself. The current version is the revision dated December 2024, and you should use it with its matching December 2024 instructions (IRS, About Form W-7, 2026). You select a reason for applying, and for Canadians the common ones are:
- Reason a, a non-resident claiming a tax treaty benefit. The casino-winnings refund usually pairs this with box h and the note "Exception 2(d), gambling winnings".
- Reason b, a non-resident filing a US federal tax return, used for FIRPTA sales, rental income, and dividend over-withholding refunds.
- Reason e, the spouse of a US citizen or resident making a joint-filing election.
- Reason d, a dependent claimed on a US return.
A Supporting US Tax Document#
Unless you qualify for an Exception, you attach the US tax return or document that creates your filing requirement, such as a 1040-NR or the 8288-B package for a property sale. Investors and gamblers claiming certain treaty benefits can sometimes apply under an Exception with supporting evidence instead of a return.
How Do You Certify Your Passport from Canada?#
You have three real options as a Canadian, and they differ mainly in what happens to your passport and how long it is gone. Apostilles and ordinary Canadian notaries are not on this list, because the IRS does not accept them for passport certification.
Mailing your only passport to another country is the part clients hate most, and it is the reason the CAA route exists. A Certifying Acceptance Agent is authorized by the IRS to verify your passport and certify it for you, so the original never leaves your hands. The US Consulates in Canada, including Toronto, Montreal, Vancouver, Calgary, Ottawa, Halifax, Quebec City, and Winnipeg, can also certify a copy for around US$50 by appointment, which is a solid fallback if you prefer to do it in person. To understand the credential itself, see our explainer on what a Certifying Acceptance Agent is.
How to Apply for an ITIN from Canada, Step by Step#
- Confirm you actually need one. Use the decision matrix above. If a W-8BEN with your SIN already handles your situation, you may not need to apply at all.
- Gather your documents. Valid Canadian passport, a completed Form W-7 (Rev. December 2024), and the tax return or Exception evidence that supports your reason.
- Choose your certification path. Original by mail, US Consulate, or a CAA who verifies you remotely.
- File the package. A mail-in application goes to the IRS ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342 (IRS, 2026). A CAA submits your verified package for you.
- Wait for the assignment. The IRS says to allow 7 weeks, and 9 to 11 weeks if you apply during tax season or from outside the US, which includes Canada (IRS, 2026).
Once your ITIN is assigned, you can file the return that started the whole process, whether that is a 1040-NR refund claim or a FIRPTA reconciliation. If you also invest in US markets, our guide on how to invest in US stocks and our overview of tax returns for non-resident aliens pair naturally with this step.
IRS-listed Acceptance Agents in Canada#
Canada has one of the largest networks of IRS Acceptance Agents in the world, with 164 listed across the country as of the directory reviewed on 14 May 2026 (IRS, 2026). Listing every one would not help you, so here are two established agents in each of the four provinces where they cluster.
Source: IRS Acceptance Agents, Canada (last reviewed 14 May 2026). Smaller provinces such as Manitoba, Saskatchewan, and Nova Scotia have one or two listed agents each, and any CAA can serve clients in any province remotely.
You do not have to drive to one of these offices. Taxsym operates a network of CAAs who verify your passport fully online, so wherever you are in Canada, you keep your passport and file without an appointment.
Does an ITIN from Canada Expire?#
Yes, but the only rule that operates today is simple: an ITIN expires if it is not used on a US federal return at least once in three consecutive years (IRS, How do I renew an ITIN?, 2026). The old middle-digit renewal batches from the 2016 to 2020 period are finished, so there is no active schedule retiring numbers by their middle digits in 2026. If you only need your ITIN for a one-time event like a single casino refund or a single property sale, expiry rarely matters. If you file every year, it stays alive on its own. When in doubt, our guides on whether ITINs expire and how to renew an ITIN cover the details.
FAQ: Applying for an ITIN from Canada#
Do Canadians have to pay US tax on casino winnings, and how do I get the 30% back?#
Yes, US casinos withhold 30% on reportable winnings from non-residents, but Canadians can recover much of it. Because Article XXII(3) of the treaty lets you deduct US gambling losses against US winnings, you file a Form 1040-NR to report the net and claim a refund of the over-withheld amount. You need an ITIN to file that return, and you generally have three years to do it.
Do I actually need a US ITIN, or is a W-8BEN with my SIN enough?#
For passive income like US dividends, interest, and royalties held through a broker, a W-8BEN with your Canadian SIN usually claims the treaty rate at source, and you do not need an ITIN. You need an ITIN when you must file a US return, for example to claim back over-withheld tax, to sell US property, or to report US business income.
What is the difference between a Canadian ITN and a US ITIN?#
The Canadian ITN comes from the Canada Revenue Agency on Form T1261 and is for non-residents who file in Canada. The US ITIN comes from the IRS on Form W-7 and is for people with a US tax filing requirement who cannot get an SSN. They are different numbers from different countries. This guide is about the US ITIN.
Why do I need an ITIN to sell my US property?#
A sale of US real estate by a foreigner triggers 15% FIRPTA withholding on the full sale price. To apply for a reduced withholding certificate on Form 8288-B, and to file the 1040-NR that reports your actual gain and reclaims the excess, you must have an ITIN. Start the W-7 as soon as you list the property.
Can I apply for an ITIN without mailing my original passport to the IRS?#
Yes. A Certifying Acceptance Agent verifies your passport and certifies it for the IRS, so the original never leaves your possession. A US Consulate in Canada can also make a certified copy for around US$50. Mailing the original is only necessary if you choose the free do-it-yourself route.
How long does an ITIN take from Canada in 2026?#
The IRS says to allow 7 weeks, and 9 to 11 weeks if you apply during US tax season, which runs from mid-January to the end of April, or from outside the US. Applications from Canada count as from abroad, so plan for the longer window.
Do snowbirds or TN-visa holders need a US ITIN?#
Usually not. A snowbird who only winters in the US typically files Form 8840 to claim a closer connection to Canada and owes no US return, so no ITIN. A Canadian who moves to the US on a TN visa is eligible for a Social Security number, so they apply for an SSN, not an ITIN.
How are my IRA, 401(k), and Social Security taxed when I live in Canada?#
Under Article XVIII, periodic pension payments, including from an IRA or 401(k), are capped at 15% US withholding, and US Social Security paid to a Canadian resident is taxable only in Canada, not by the US. Whether you need an ITIN depends on whether you must file a US return to adjust the withholding.
The Bottom Line for Canadians#
The Canada-US relationship is close enough that a W-8BEN and your SIN solve most everyday US withholding without any ITIN at all. The ITIN matters at the filing moments: clawing back casino withholding, reconciling a FIRPTA sale, reporting US rental or business income, or filing with a US-citizen spouse. Those are exactly the cases where the money at stake is largest and the paperwork is least forgiving, and they are the cases I handle as a CAA. If you have hit one of them, you do not need to mail your passport across the border to get started.