Title sponsor - $15-50m
For this sort of money, a company would have its brand included in the official title of the team - ie West McLaren Mercedes - and be positioned on all the highest-profile parts of the car which get most TV exposure.
A company like West or Marlboro might pay up to $50m to have this sort of link with McLaren or Ferrari, whereas a middle ranking team could expect less than half that, and a back-of-the grid outfit half as much again.