A note: You don't cost £30k to your employer, more likely 1.5-3x that. So say an employee costs a total of $250k, their pay could be anywhere between $80-180k with other compensation (retirement packages, health benefits) and overhead making up the rest. (the higher the multiple, the less efficient the company likely is, in this case I'd expect it would be closer to the 1.5x mark than the 3x mark)