Kutcher is pulling in a reported $700,000 per episode, or $15.4m for his first full season on the hit show.
But Kutcher's paycheck, although higher than the show's other stars Jon Cryer and Angus T. Jones, is still less than the $1.2m per episode Sheen got before his meltdown.
Ashton, 33, will play the role of Internet billionaire Walden Schmidt in the comedy.
And his new co-stars have been quick to praise Kutcher with Cryer calling him 'amazing' in tapings.
'He took the roof off the place. It's a lovely vibe,' he said.