Source of Income:Rand-Meachum Inc. & Heroes for Hire Inc.
Danny Rand, the Iron Fist, is the CEO of Rand-Meachum Inc. and one of the founders of Heroes for Hire Inc. While Heroes for Hire may have made enough money to put food on the table, Rand-Meachum (or Rand Corporation) is really where Iron Fist's wealth comes from.
Formed by Danny's father, Wendell, and his business partner Harold Meachum, Rand-Meachum Incorporated was formed as an investment enterprise and funded research.
While Iron Fist himself admits his wealth can't compete with Iron Man and Stark Industries, he still helped finance Captain America's Secret Avengers.