is confined to just four states with Nevada being the only state that allows full-fledged sporting betting. Estimated $90.0 Billion to Be Bet on Football Seasonĭespite all the betting that takes place in office pools and at Super Bowl parties, sports betting in the U.S. In fact, we’ve never been refused an eligible refund. resident and had 30% of your gaming winnings withheld by the IRS, you can reclaim a portion or all of your taxable winnings by using RMS. and win a significant amount of money betting on the NFL, college football games, or any other sporting event, your winnings could be subject to a 30% withholding tax by the IRS. With the NFL season set to start on September 22, 2016, the top casinos in Las Vegas are getting geared up for another record season of sports betting.