Winning at a US Casino as a Canadian: The 30% Withholding and Refunds

What the 30% applies to

The starting point is IRS Publication 515, the guide to withholding on payments to foreign persons. It says that gross gambling proceeds won in the United States by a nonresident alien are subject to 30% withholding when the income is not effectively connected with a US trade or business and no treaty exempts it. For a visitor playing recreationally, that is the normal case. The withholding is applied to the gross payout, not to what you won after subtracting what you lost earlier in the evening.

That detail is the source of most of the pain. A casino pays out one jackpot; it has no view of the money you fed into the machine over the previous six hours or the previous three trips. Withholding is a collection mechanism, not a final tax bill, and the gap between the two is exactly where a refund claim lives.

Publication 515 also notes that the separate chapter 4 withholding regime does not apply to these proceeds, so the 30% you see on a payout slip comes from chapter 3. Whether and when a particular casino withholds on a particular payout depends on its own procedures, so the practical step is to ask at the cage what will be withheld and what paperwork it will give you before you accept a large payout.

Games that fall outside the withholding

Publication 515 carves out a short list. Nonbusiness gambling income from blackjack, baccarat, craps, roulette and the big-6 wheel, played in the United States, is not taxed for a nonresident alien. The same section says a Form W-8BEN is not required to claim that exemption, although the casino may still want one for Form 1099 reporting and backup withholding purposes.

Notice what is missing from the list: the publication's text on this point does not name slot machines, keno, bingo or poker tournaments as exempt. We read that as a reason to assume that a slot jackpot sits on the withholding side of the line, while a large blackjack or roulette win does not. If a payout is large and the game is borderline, ask the casino which category it applied, and keep the answer in writing.

Canada is also not among the countries whose residents are exempt from US tax on gambling income under that section of the publication. Residents of several European countries, Japan and others are listed; Canadians are not, which is why the treaty loss clause below matters so much.

The treaty clause that makes recovery possible

The Canada-US tax convention was amended by a protocol that added a new paragraph 3 to Article XXII (Other Income). The text reads: losses incurred by a resident of a Contracting State with respect to wagering transactions, the gains on which may be taxed in the other Contracting State, are deductible for the purpose of taxation in that other State to the same extent that such losses would be deductible if they were incurred by a resident of that other State.

In plain terms, a Canadian resident is treated like a US resident when counting gambling losses against US-taxed winnings. The IRS puts it in a single sentence on its gambling topic page: nonresident aliens who are not residents of Canada generally cannot deduct gambling losses, which implies that Canadian residents can. For US residents, the same page says losses are deducted only if the taxpayer itemizes, records were kept, and the amount deducted cannot be more than the gambling income reported. So the treaty gives you a deduction, but a capped one, and it needs documentation.

A worked example with invented numbers

The table below is our own arithmetic, not an IRS illustration. It assumes a slot jackpot, withholding at 30%, documented losses in the same calendar year, and a hypothetical US tax of $300 on the net amount. The real tax depends on brackets and filing details that we do not model here.

Change one input and the picture shifts. With no records of losses, the net figure is the full 10,000 and the withholding may be close to the final tax. With losses of 12,000, the deduction is capped at the 10,000 reported, so the extra 2,000 of losses is wasted for US purposes. That cap is why people who play heavily but win once sometimes find the refund smaller than they hoped.

The paperwork: W-8BEN, 1042-S and 1040-NR

Three forms recur. The first is Form W-8BEN, the certificate of foreign status that a foreign individual gives to the withholding agent or payer. Publication 515 says treaty claimants must provide it with a US or foreign taxpayer identification number to claim treaty benefits on gambling income that is not effectively connected with a US business. Which number goes on the form for a Canadian filer is something to confirm against the form instructions before you sign.

The second is Form 1042-S, which reports income and the tax withheld from it. Publication 515 says payments subject to chapter 3 withholding are reported on this form. The practical point is simple: if a casino withheld, ask for the 1042-S and check that the name, the amount and the income type match what you were paid. Without it, proving what was withheld becomes much harder.

The third is the return itself. The IRS says a nonresident alien who must file for US gambling winnings uses Form 1040-NR. This is where winnings are reported, the treaty loss deduction is claimed and the withheld tax is credited against the result. Because the treaty clause turns on technical points, many Canadians hire a cross-border preparer for the one filing; we would not try to improvise it from a casino receipt.

Getting an ITIN when you have no SSN

A return generally needs a US taxpayer identification number, and a Canadian visitor does not have a Social Security number. The route is an Individual Taxpayer Identification Number, applied for on Form W-7. According to the W-7 instructions, the form is normally attached to the front of the tax return and filed by the due date, or with an extension.

Identity documents are the usual stumbling block. A valid passport is the only stand-alone document, and if you submit the original or a certified copy from the issuing agency you do not need to add other documents. A certified copy must be an exact copy bearing an official stamped seal. A Certifying Acceptance Agent can verify originals so that you do not mail your passport away. The instructions say to allow 7 weeks for a status notice, and 9 to 11 weeks in peak periods from January 15 to April 30 or when filing from overseas.

The instructions also describe exceptions that let some applicants obtain an ITIN without attaching a return, including one for gambling income when claiming treaty benefits. Whether an exception fits a Canadian claiming the loss clause is a question for the preparer, because the exception tables set their own documentation requirements.

Records worth keeping before you travel

The loss deduction is only as good as the evidence behind it. The IRS gambling topic page ties the deduction to records of winnings and losses, and the treaty clause borrows the US rule. Before a trip we would set up the following:

• A dated log of sessions: casino, game, buy-in and cash-out.
• Player-card statements, where the casino issues them.
• Copies of every payout slip, jackpot form and Form 1042-S.
• A photocopy of the passport page and any W-8BEN submitted.

Keep these with your Canadian records too, since the CRA has its own view of when gambling counts as income; our piece on when the CRA treats gambling as business income covers that side.

For wider background on the legal landscape see our gambling laws overview.

For how land-based venues differ, see our land-based casino reviews.

If gambling is causing harm, the responsible gambling page lists support, and ConnexOntario is available at 1-866-531-2600.