True, but I think lots of folks here have no idea how much revenue you have to bring in to cover 20+ employees. Lots of people think it's just salary*20.

Well in a software company salary is generally the dominating factor, so it is on the order of what you mentioned (times a multiple depending on how cushy the amenities). In my unqualified estimation, the multiple can kill you... seems like about 2x salary for SF, 1.6x for NYC, though my company prides ourselves on keeping it a lot leaner than many of our compatriots.

I think that multiplier is what bane was alluding to. Incidentally, your numbers seem low for software devs - I'm fairly certain I cost well over 2x salary (NYC). Although my company prides itself on compensating well, so maybe most startups run a lot leaner than that.