Do new professors typically get paid for course prep done prior to starting their job? I will be starting as an Assistant Professor this fall (in the US). My official start date is one week before the start of classes. This means I will need to develop the course during the summer, before I have officially started my position. I asked the department if there was compensation for class prep, and they said there was not because it is included in my job requirements.

Q: Is this the standard for new professors in the US?

I think it's a little odd, as I'm currently working a full-time job and developing a course on top of that will take substantial effort. If I were being paid for class prep, I could leave my current position earlier. I'm not suggesting that I should be paid for subsequent course preps, but I have never been asked to put so much effort into a job before officially starting the position.

I don't hold it against the department-- I don't think they have anything to do with this decision. I would just like to know if this is typical or not.
It's also my understanding that your situation is standard.

Basically, you're expected to know how to teach that class already.  Any prep you do before hand amounts to you getting ready to do the job they hired you for, which a normal private sector company doesn't pay you for either.

But really, the explanation doesn't matter so much as the fact that this is widely accepted as normal.