The same is true (at least in my experience) in America. Over 40 hrs/week means the employer has to pay out extra benefits. This is also why employers do not want you to work over 39 hours if you're not salaried.
In the US, over 40 hours simply means 1.5x your regular payrate after the 40th hour, if you're "non exempt", i.e. hourly. Some employers might offer something more.
