Form 1040-NR: How Canadians Recover US Gambling Withholding Tax

Why the IRS withheld 30% of your winnings

Under IRC §1441, US payers must withhold 30% in federal tax on most gambling winnings paid to nonresident aliens. The payer issues Form 1042-S (the nonresident equivalent of the W-2G) showing gross winnings in Box 2 and tax withheld in Box 7. The withholding is the IRS's default — not your final tax bill.

Withholding applies to slot jackpots of $1,200+, bingo of $1,200+, keno of $1,500+, poker tournament wins of $5,000+, and other wagers paying 300:1 odds at $600+. Blackjack, baccarat, craps, roulette, and big-six wheel are exempt from withholding by treaty regardless of the amount won.

The Canada–US tax treaty advantage

Article XXII(3) of the Canada–US Income Tax Convention lets Canadian residents offset US gambling winnings with US gambling losses incurred in the same calendar year, then claim a refund of withholding on the net amount. This is a privilege not extended to most other foreign nationals — for example, a UK resident in the same situation cannot claim losses and forfeits the full 30%.

Net result: if your documented US losses equal or exceed your US winnings, you can typically recover 100% of the withholding. Smaller refunds scale proportionally.

Step 1: Get an Individual Taxpayer Identification Number (ITIN)

The IRS will not process Form 1040-NR without an ITIN or SSN. Most Canadians need to apply for an ITIN using Form W-7, submitted together with the 1040-NR in the same envelope. You will need:

• A completed Form W-7
• A certified copy of your Canadian passport (or originals returned by mail), or documents certified by a CAA (Certifying Acceptance Agent)
• The Form 1042-S issued by the US payer
• Your completed Form 1040-NR (see Step 3)

CAAs are the practical route — they verify your passport in-person and you keep your original document. The IRS publishes a CAA directory by country.

Step 2: Build a session log the IRS will accept

The IRS only allows loss offsets that are contemporaneously documented. Per Revenue Procedure 77-29 and Publication 529, your log must capture, per session:

• Date of the wagering activity
• Type of wager (slots, table, sportsbook, lottery, etc.)
• Name and address of the establishment
• Amount wagered, amount won, amount lost
• Names of people present (table games)

Back the log with corroborating evidence: casino win/loss statements, ATM withdrawal records from US ATMs, hotel folio receipts proving you were on-property, and the 1042-S itself. NetBetTracker generates a session log in this exact format from your wager entries — keep entries up to date during your US trip rather than reconstructing months later.

Step 3: File Form 1040-NR

Key lines for a gambling refund claim:

• Schedule NEC, Line 10a (Gambling). Report gross US winnings in column (c) for the 30% rate, and your allowed loss offset in column (d). The taxable amount becomes winnings minus losses (treaty offset).
• Schedule OI, Item L. Claim treaty benefits. Reference Canada, Article XXII, Paragraph 3, and state the gross winnings and the amount exempt.
• Form 1040-NR, Line 25g. Enter the federal tax withheld from your 1042-S (Box 7).
• Line 35a. Your refund amount, with bank details on lines 35b–d for direct deposit (US bank only) or a mailing address for a paper check.

Mail the complete package — 1040-NR, W-7 (if applying for an ITIN), Form 1042-S original, and W-7 supporting documents — to the address in the W-7 instructions (currently the IRS ITIN Operation in Austin, TX). Do not file electronically when the return is paired with a W-7.

Deadlines and refund timing

You have three years from the original due date (June 15 of the following year for nonresidents without US wage income) to file 1040-NR and claim a refund. After that, the refund is forfeited by statute.

Processing time: typically 8–12 weeks once the IRS has an ITIN on file. First-time filers requesting an ITIN should expect 16–22 weeks because the W-7 is processed before the return. Direct deposit is only available to a US bank; otherwise a paper check is mailed in USD.

Common mistakes that delay (or kill) the refund

• Reconstructed logs. A spreadsheet built six months later, with no corroborating evidence, is routinely rejected. The log must be contemporaneous.
• Claiming Canadian losses. Only US-source gambling losses offset US winnings under the treaty. Losses at a Canadian casino do not count.
• Sending the 1042-S as a photocopy. The IRS wants the original. Keep your own copy before mailing.
• Missing the Schedule OI treaty disclosure. Without it the IRS often denies the loss offset and refunds only the over-withholding (which is usually zero).
• Filing past the three-year window. The IRS cannot waive the statute of limitations on refunds — even if your paperwork is perfect.

This article is general information, not tax advice. Cross-border tax rules change and individual circumstances vary — consult a CPA or cross-border tax specialist licensed in both Canada and the US before filing.