From that link :
" For Canadians (and other non-resident aliens), the gambling winnings tax is 30% of the total win."
The only way to recover withheld winnings is to demonstrate losses to cover the money withheld. Canadians (while gambling in the US of A) are taxed on net winnings over the calendar year, so if you win 10,000 in a poker tournament and lose $10,000 playing blackjack then your profits are $0 and you can recover the money that has been withheld.
I think G Man's confusion stems from the fact that blackjack winnings are not withheld by the casino, like a slot win would be. That in no way absolves you of your tax liability to the IRS. And if you are going to cheat on your taxes, I would strongly advise you against bragging about it on a public forum.
It also isn't exactly true that Canadians do not pay taxes on gambling. The position of the CRA is that professional and semi professional gamblers must file and pay taxes on their winnings. Historically they have been unable to collect in court, because the court is very careful to not allow ordinary Canadians to write off gambling losses as a business expense, but theoretically professional and semi professional gamblers can be taxed on their winnings. The sticking point is that the CRA must prove that the gambler in question has a winning system, a trivial task when it comes to winning blackjack players.
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