Question - do you always gain rep for completing a mission?

I'm not talking about contracts for local governments (though I'd be interested in learning if you can gain rep with them - there's no slider for them so I assume not.)

Rather, I'm referring to contracts for the major powers - where you have a rep slider. The slider is specifically titled something like Bonus Rep... implying that you always gain some for a completed job. But I'm not certain because this is the only slider which can go all the way down to zero.

Looking at my Reputation interface, it looks like I'm slowly gaining rep with the main faction for the territory I'm in... but I'm not certain. I have not noticed rep mentioned anywhere else when picking a contract.

Has anyone figured this out for sure?