I just found out some of the details of the state of CA’s tax laws as it applies to winning prizes. Pasting in the info so you can read it for yourselves. This relevant to all events in CA including the GP and Worlds.
Tim
Important Information Regarding Tax Withholding for Non-California Residents
Please be aware that if you are not a resident of the state of California, and your winnings total $1500 USD or more, those winnings will be subject to 7% CA tax withholding. This amount will automatically be deducted from your prize check.
This applies to both international citizens and to US residents of states other than California.
You will be mailed a form CA 592-B by January 31, 2012 that shows the prize winnings and CA withholdings. In some cases, the amount withheld may be reclaimed at the end of the tax year. For more information on California filing requirements, call the numbers listed below:
From within the United States, call: (800) 852-5711
From outside the United States, call (not toll-free): (916) 845-6500
Additionally for every event held in the US, the US withholding tax of 30% will automatically be deducted from the prize check of all international players, unless the proper treaty exemption documentation has been filed with the withholding agent. Please consult with a tax professional to determine if you qualify for a treaty exemption or any other tax questions you may have. Hasbro, Inc will mail the 2011 Form 1042-S showing the amount of the gross income and any US tax withheld to the prize recipients in March 2012.