To put some guesstimates on it: Say 50k average cash compensation (low for tech, but most businesses aren't tech). Health insurance, social security, medicare

To put some guesstimates on it: Say 50k average cash compensation (low for tech, but most businesses aren't tech). Health insurance, social security, medicare, 401k match, etc. would add to this number. 10k employees * 50k/year / 12 months = 41.6 (repeating of course) million per month.