UFC President Dana White is stepping into the ring—not for a fight, but for a tax policy change. In a letter to President Donald Trump this week, White urged the administration to reverse a specific provision in the recently signed One Big Beautiful Bill Act (OBBBA), arguing it's already "creating problems" for American gamblers and sports fans.

The OBBBA, signed into law last year, brought sweeping changes to the U.S. tax code. But one particular change has White—and many in the betting world—up in arms. Starting January 1, taxpayers can now only deduct 90% of their gambling losses against their winnings. Previously, that figure was 100%. That missing 10% doesn't carry over to future years or offset other income—it simply vanishes, meaning even bettors who break even or lose money at the casino could still owe the IRS come tax season.

The new rule casts a wide net, covering everything from casinos and sportsbooks to daily fantasy sports, racetracks, lotteries, and online gaming. It applies to both casual players and professional gamblers alike.

In his letter, White made clear he supports the OBBBA overall but singled out this provision as a major misstep. "I write today to raise an issue we have discussed in the past: the need to reverse the 90 percent limit on gaming loss deductions for US taxpayers included in the OBBBA," White wrote. He argued that the policy now makes it "irrational to bet in the United States" because bettors could end up owing taxes even when they lose—or face a tax bill that exceeds their winnings for the year.

White also highlighted a broader concern: the provision undermines another key part of the OBBBA—the "No Tax on Tips" policy, which was designed to benefit workers in states like Nevada. "This has the impact of setting back your signature policy No Tax on Tips which greatly benefits Nevadans because gamblers who win big," White noted, calling on Congress to fix the issue before it causes more damage.

For now, the ball is in Trump's court—and the sports world is watching closely.