minus vacation, taxes, health insurance, overhead (time tracking, billing, book keeping, etc), time between gigs. 2050052 you are coming in way high. You can cut that in half and get a reasonable estimate for take home.
There are people who are perfectly happy with about $250K of take-home pay a year if that means they have plenty of freedom to do other things. In fact, I bet many people in the US will be happy with $30K a year, not $250K.
