Kaley Cuoco earned over $163 million for 'The Big Bang Theory' alone — here's how she makes her money

For the first three seasons of "The Big Bang Theory" from 2007 to 2009, Cuoco and her castmates collectively earned $60,000 per episode.

Kaley Cuoco and Johnny Galecki in season 1 of "The Big Bang Theory." CBS

Cuoco and castmates Jim Parsons and Johnny Galecki didn't start off making huge money on the show.

In fact, the trio took in $60,000 per episode for the first three seasons, according to Deadline. Across 63 episodes, Cuoco earned $3,780,000.

But something must have been working because things changed once season four rolled around.