According to Forbes, Tiger has earned a billion dollars since turning pro. This number includes tournament prize money, appearance fees, endorsements, golf course design, and bonuses. Not sure what bonuses he gets as a golfer, unlike football where players make millions just for signing a contract, but his IMG agent Mark Steinberg must do a great job for him.
He is the first athlete to surpass the benchmark of a billion dollars. His pal, Michael Jordan, may also earn a billion, but it is estimated that it will take him four or five years.