https://playercare.ultimatepoker.com...ed-to-the-IRS-
If you are an American and win $5,000 or more in a single tournament:
Ultimate Poker will issue a W2G tax form to the player and to the IRS.
If you are a non-American and win $5,000 or more in a single tournament:
A 1042-S will be sent to the player. We will withhold 30% of winnings unless all of the below conditions are met:
- The player is resident of a tax treaty country
- The player has an IRS Tax Identification Number (TIN)
- Ultimate Poker has a signed W-8BEN on file for the player
For more details and how this affects you in particular, you should discuss this with an accountant or attorney.