The role of referee in the NBA is one of the most important things in games. The officials on the court ensure that every game is conducted fairly and within the boundaries of rules and regulations. Keeping in mind what the whistleblowing staff brings to the game, the league makes sure that they are taken care of well. The salaries are kept at the right level so they can do the job at their best and maintain the integrity of games every time.
Salaries are based on many factors

Like other jobs, the salaries of NBA referees are also based on seniority and performance. According to the National Basketball Referees Association, league officials earn an average of $180,000 to $550,000 per year. The entry-level salary of an NBA referee is approximately $250,000 per year. Meanwhile, experienced or professional referees earn more, about $3,500 per game or $550,000 per year.
Playoffs are whistled by special referees

Additional compensation is awarded if a referee gets the opportunity to officiate in a playoff game. They can earn around $800 to $5,000 per game per season. But not all referees can whistle for the playoff matches, as these are reserved for those with more than five years of experience. In addition to monetary compensation, NBA referees also receive other benefits, including health insurance, travel allowances, and retirement plans.
How does one make it to the NBA?

Referees aspiring for the NBA should have a thorough knowledge of the sport. Officiating in high school games is a good start, as they can learn the rules of the game and gain experience. After refereeing in high school, they can move on to register and eventually call games in the National Collegiate Athletic Association. Prospective referees are asked to take a basketball officiating test and if they pass, they get call-ups for Division 2 and 3 and advance to Division 1 games, where they can further develop their skills amid larger crowds.
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They can then advance to the NBA G league, where they may be positioned for an ultimate career in the NBA. While NBA referees are not required to have started in the G league, however, being part of the development league helps as the association traditionally hires those for the G league roster of referees. Once they make it to the NBA, they are expected to represent the league with best knowledge, fairly and honestly.
Currently the Highest paid referees in the NBA are the following :-

Tom Washington (32 years)
Scott Foster (29 years)
Tony Brothers (29 years)
James Capers (28 years)
Sean Corbin (26 years)
Rodney Mott (25 years)
Marc Davis (25 years)
Pat Fraher (22 years)
Eric Lewis (19 years)