The rule of thumb for a large cash winning is general 50% after taxes, but it does depend on your other income and deductions. There is a loophole here. Legally you can offset your winnings with proof of gambling or legalize game of chance losses. In other words if you win $100,000 for the tax year and show proof of $40,000 in losses you only pay tax on $60,000, not $100,000.In the case of Maggot it would be pretty hard to "fudge" $500,000 in losses to offset her winnings. But in the case of Scurvette who only won $50,000, a few trips to the racetrack where she can pick up large betting tickets that the losers throw away when their horses don't come in, could prevent her from paying a lionshare of her winnings. Sure it's dishonest, but considering what many Reality Show winners do to get their dough in the first place, it's just par for the course.