The NFL has one. The NBA has one. The NHL has one. Major League Baseball does not. The salary cap — a maximum amount a team can spend on player payroll — is used across professional sports to control costs and promote competitive balance. Baseball is the holdout, and whether that changes may be the defining question of the next CBA negotiation.
A salary cap is a league-imposed ceiling on the total amount a team can spend on player salaries in a given season. The purpose is to prevent wealthy teams from simply buying championships by outspending everyone else. In theory, a cap forces every team to build through drafting, player development, and smart roster management rather than through unlimited spending.
There are two main types. A hard cap, used in the NFL and NHL, is an absolute ceiling that no team can exceed under any circumstances. If you are at the cap, you cannot add another player without releasing or restructuring an existing contract. A soft cap, used in the NBA, sets a threshold but allows teams to exceed it through specific exceptions — most commonly to re-sign their own players. The NBA also has a luxury tax on top of the soft cap, creating a graduated system of deterrence.
The payroll gap in baseball is staggering. In 2025, the Dodgers’ competitive balance tax payroll reportedly exceeded $400 million, while the Marlins spent below $90 million. That’s a difference of more than $300 million — more than the entire payrolls of most teams in the league.
Owners of smaller-market teams argue that this disparity makes it almost impossible to compete. Even with revenue sharing and the luxury tax, the richest teams can absorb the penalties and keep spending. A hard cap, they argue, would create genuine cost certainty and force every team to compete within the same economic boundaries.
Several owners and Commissioner Rob Manfred have made the salary cap a stated priority heading into the 2026–2027 negotiations.
The MLBPA views a salary cap as a mechanism that would suppress total player compensation. If every team has a maximum they can spend, the argument goes, the total amount of money flowing to players across the league would shrink. Instead of competing against each other to sign stars, teams would point to the cap as a reason they can’t offer more.
The union fought its longest and most damaging strike in 1994–1995 specifically to prevent the owners from implementing a salary cap. When the owners attempted to impose one unilaterally, federal judge Sonia Sotomayor — later a Supreme Court Justice — issued an injunction blocking the move. The MLBPA considers the absence of a salary cap to be the union’s most important achievement, and giving it up would represent a fundamental shift in the sport’s economic structure.
Players also point out that a cap without a meaningful salary floor would primarily benefit owners: it limits what rich teams can spend without requiring cheap teams to spend more.
The NFL uses a hard salary cap tied to a percentage of league revenue (roughly 48% goes to players). Every team operates within the same ceiling, though teams can manipulate the system through signing bonuses, restructured contracts, and dead cap. The NHL also uses a hard cap tied to league revenue, with both a ceiling and a floor. The NBA uses a soft cap with extensive exceptions, plus a luxury tax that escalates steeply for repeat offenders.
In each of these leagues, the cap is tied to a percentage of total league revenue. If revenue goes up, the cap goes up, and players benefit. This revenue-sharing structure is something the MLBPA has historically rejected, though some analysts argue it could actually increase total player compensation if structured correctly — MLB players received an estimated 47% of league revenue in 2024, compared to roughly 50% in the NFL, NBA, and NHL.
In MLB Strike 2027, the salary cap is one of the central negotiation issues. You set the hard cap number yourself — or choose not to implement one at all — and watch how players, owners, and the public react. Set it too low and the players revolt; set it too high and the owners don’t see the point. Finding the right number is harder than it sounds.
The Salary Cap/Floor Tool lets you experiment with different cap levels alongside a salary floor and luxury tax threshold, instantly showing you the tradeoffs.
FanGraphs: MLB Payroll Tracker