Figure out the minimum income you need to be free

By free I mean able to do what you love without having to slave away at a job all day. I know we all would like the ultimate house with a BMW (M3 for me please,) but wouldnt you rather be from having to do a job you dont LOVE? If you agree with that, a great way to make it more feasible is to calculate exactly how much money you would need per month year to be free. Minimalism is the goal here (If youre having trouble not counting in that BMW, watch Fight Club and then have another go).