"Terminator 3: Rise of the Machines" was released in 2003, while its predecessor "Judgment Day" came out in 1991. As reported by The Numbers, the production budget of "Judgment Day" was around $100 million, and the movie went on to become a huge success, having earned around $515 million globally. As such, there was definitely a push to create another sequel, but it would take some back and forth between Arnold Schwarzenegger, lawyers, and the studio involved with "Terminator 3."
According to Slate, Schwarzenegger's contract contained a lot of stipulations and caveats. His first condition to return to the role was for a $29.25 million fee, which he would get regardless if the movie was made or not. He would be paid $3 million upfront and the rest of the sum over 19 weeks of production. If the production went over this 19-week limit, Schwarzenegger would receive an additional $1.6 million every week. Schwarzenegger also wanted $1.5 million for private jet rides, a fully stocked gym trailer, three deluxe suits at filming locations, and immediate access to bodyguards and limousines throughout the day.
Not only that, but Schwarzenegger was also guaranteed 20% of the gross receipts, which includes home video sales, movie tickets, and other licensing deals involving "Terminator 3," such as video games. He was also granted pre-approval rights to choose whom he worked with, which included the director, hairdresser, makeup artist, stunt double, stand-in actor, personal doctor, chef, and unit publicist. Schwarzenegger knew they needed him to film "Terminator 3," and wasn't afraid to show his financial muscle and strong bargaining position.
