The formula
revenue needed = (take-home + business costs) ÷ (1 − tax share)
hourly rate = revenue needed ÷ (working weeks × billable hours per week)The tax set-aside is a share of revenue, which is why it divides rather than adds. With the defaults: ($60,000 + $6,000) ÷ 0.75 = $88,000 of revenue over 1,150 billable hours, or $76.52 an hour.