Let x equal your income for a calendar year, divided by the median income for your locale during the previous year. If x < 1, your fair share is 0. If x < 50,

Let x equal your income for a calendar year, divided by the median income for your locale during the previous year. If x < 1, your fair share is 0. If x < 50, your fair share is your income times ln(x)/ln(2500). Otherwise, your fair share is your income times (1 - ln(50)/(2 * ln(x))). The success of your enterprise is highly dependent on the cooperation of many people who will never be directly rewarded by you for their role. You won't even know their names. Sometimes people forget that their success is only possible if a civilization exists, and it upholds societies that are functional for everyone in them.