Earlier this month, it was announced that Kutcher would be replacing Charlie Sheen on the CBS sitcom, following Sheen's dismissal in March due to a string of public spats with creator Chuck Lorre.
However, according to the Wall Street Journal, Kutcher's contract only extends to a single year, allowing both parties to terminate it at the end of that time period.
Despite this uncertainty, it is believed that CBS are seeing Kutcher as a permanent addition for the show and are looking for the series to continue for several more years.
Kutcher, who will allegedly receive around $20 million for a single season of the show, recently admitted that he had landed "the best job in show business".
The actor will begin filming for the new season of Two and a Half Men this summer for a launch this fall.