Yes you need an ITIN .
Yes you can apply at any IRS office or at a U.S. embassy, (IRS office is easier)..
I applied for mine at the Las Vegas IRS office.
Just keep a record for each day of play showing your net winnings for the day.
You file a U.S. tax return once a year to try and get your money back.
If you have a net win for the year you will have to pay taxes on the net winnings.
Following is some information from the IRS website.
Regards
A.P.
a.. I won money at a Las Vegas casino and my winnings were subject to a 30% withholding tax. I am a Canadian citizen. How can I get the withholding tax back?
Generally, you must file a tax return to claim a refund of withholding. Gambling winnings by nonresidents of the U.S. are taxed at a flat 30% tax rate. However, under the U.S./Canada Tax Treaty, residents of Canada may claim gambling losses, but only to the extent of gambling winnings. You should report both your total gambling winnings and your total gambling losses on page 4 of Form 1040NR (PDF), U.S. Nonresident Alien Income Tax Return on the dotted portion of line 79. If you have net gambling winnings (after offsetting your total losses against your total winnings), you should include this net amount on line 79, column (d) of the Form 1040NR. You should also attach a copy of the Form 1042-S, Foreign Person's U.S. Source Income Subject to Withholding, showing the taxes withheld to your Form 1040NR.
A diary of your losses should be kept for your records.
To file a Form 1040NR you must have a valid identification number. For most people this is a social security number (SSN). However, if you do not have and cannot obtain a SSN you may use an Individual Taxpayer Identification Number (ITIN). If you do not have an ITIN you may apply by filing Form W-7 (PDF), Application for IRS Individual Taxpayer Identification Number. Along with the completed Form W-7, you must submit document that verify both your identity, that is, contain your name and a photography, and your foreign status. If you have one document that verifies both, such as a passport, then one document is enough. You may, however, have to provide a combination of documents, for this purpose.
References:
a.. Publication 515 (PDF), Withholding of Tax on Nonresident Aliens and Foreign Corporations Publication
b.. Publication 519 (PDF), U.S. Tax Guide for Aliens
c.. Publication 597 (PDF), Information on the United States-Canada Income Tax Treaty
d.. Publication 901 (PDF), U.S. Tax Treaties
e.. Form W-7 (PDF), IRS Application for Individual Taxpayer Identification Number
f.. Form 1040NR (PDF), U.S. Nonresident Income Tax Return
g.. Publication 1915 (PDF), Understanding Your IRS Individual Taxpayer Identification Number
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----- Original Message ----- From: "veres1" <jveres@shaw.ca>
To: <vpFREE@yahoogroups.com>
Sent: Tuesday, July 18, 2006 10:03 PM
Subject: [vpFREE] ITIN
Greetings,
As a Canadian, any advice on the best way to go about getting back the
30% withholding tax on winnings?? I understand that I must get an
Individual Taxpayer Number. Can I apply somewhere in Vegas the next
time I am down there?? How detailed must my playing history be for the
IRS??? Do I apply for the refund only once a year?? Any help or
direction would be highly appreciated!!!!
Thanks
Joe