Jobs don't pay you too much. You'll almost always stay on negative balance. However, the game does not punish you for not being honest. There's certain jobs that requires you for example, to just change the broken HDD. You open the rig, and it's a 2TB HDD. You can put a 250GB HDD on its place and still receive the money with no penalties or anything. This works with every job that requires you to only change specific part(s).