How much additional cost does a California company have to pay for a $100k employee?As a very rough answer for planning purposes, the HR costs for most white collar workers with modest benefits runs about 20% of nominal salary, so you can use $20K for a $100K per year worker for a rough cut of your budget, business plan, pitch deck, etc.
This includes payroll taxes and basic benefits (worker's comp insurance, health insurance, and so on), and payroll service costs, but does not include things like administrative support, the HR department, occupancy costs, recruiting and retention costs, bonuses, and so on. It also assumes that any paid time off and overtime incorporated into the $100K figure, not paid extra. The "fully loaded" cost is probably closer to the figure Philip Wattis gives, 2X. Consulting companies and some government contractors use a 2.0-2.3X hourly wage as a zero profit starting point, with any profit coming after that.