In addition, social security payments will also be based on revenue rather than turnover, resulting further changes to rates. For horse racing, this will become a 6.8% GGR levy, for sports betting, 10.7% and for online poker, 4.1%. We know paying taxes is a bummer, but if you're a big winner, you must fulfil some legal obligations. If you are in the US, you must fill out a tax form - even in Las Vegas. For winnings over €1000, the IRS will get a cut. You will pay tax on all your winnings, and th