If you want to spend $50 a day, have $500 in fixed monthly bills, and save 20% of income, you need about $2,810 a month, or roughly $33,700 a year, before tax. Daily discretionary spend of $50 times 30.4 days is about $1,520 a month; add fixed costs, then gross up by the savings rate. The chart shows required income climbing as your savings rate rises.