In professional league sports, agents are limited by the players unions on what percentages they can charge for negotiating contracts with teams, which is no more than 20 percent. However, agents can earn more when negotiating contracts for endorsements and other agreements and for coaches and non-unionized clients, because these are not subject to union oversight. Most firms have standard percentages for marketing services, the highest reaching the 50 percent range.

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Quizplus · Accepted Answer

In professional league sports, agents' commission rates for negotiating player contracts are indeed regulated by players' unions, but the maximum is typically much lower than 20 percent. For example, in the NFL and NBA, the cap is around 3% and 4% respectively. The higher percentages, such as up to 50%, might apply to earnings from endorsements and other off-field income, not for negotiating contracts with teams.

In Professional League Sports, Agents Are Limited by the Players