When the Kansas City Chiefs and Philadelphia Eagles take the field at Levi's Stadium in Santa Clara on February 9 for Super Bowl LX, millions of viewers will be fixated on the spectacle, the halftime show, and the record-breaking payouts awaiting the victors. But behind the pageantry lies a financial reality that most fans — and even some players — don't fully appreciate until they sit down with their accountants in April. California's so-called "jock tax" is poised to take a significant bite out of every player's earnings from the biggest game in American sports, turning what should be a pure celebration of athletic achievement into a case study in state tax policy.

The NFL's decision to host Super Bowl LX in California means that every player who steps onto the field will owe the state a portion of their game-day income — regardless of where they live. California's top marginal income tax rate of 13.3% is the highest in the nation, and it applies to nonresident athletes who earn income within the state's borders. For players on both rosters, this translates into thousands of dollars — and in some cases tens of thousands — that will flow directly to Sacramento rather than into their bank accounts. As Fox Business reported, this little-known rule catches many by surprise, despite being a well-established feature of California's tax code.

The Golden State’s Hidden Tax Blitz: How California’s ‘Jock Tax’ Will Quietly Drain Super Bowl LX Players’ Paychecks

What Exactly Is the 'Jock Tax' and Why Does It Matter for Super Bowl LX?

The jock tax isn't unique to California — more than two dozen states and several cities impose some version of it — but California's version is among the most aggressive in the country. The concept is straightforward: professional athletes who earn income while performing in a state are subject to that state's income tax, prorated based on the number of "duty days" they spend working there. For a Super Bowl appearance, this means that a player's total compensation for the season is divided by their total duty days, and the portion attributable to days spent in California is taxed at California rates. Duty days typically include not just game days but also practices, team meetings, and travel days associated with the event.