First, like everyone said his numbers are BS. Licenses, workmans comp, etc are taken out of revenue, so his true 'profit' to which federal income and state taxes would be calculated
is closer to $125K (if his take home of $75K is true). So NEITHER the increase in federal or CA income taxes would apply to him as he doesn't fall in the top brackets.
Just for the sake of argument, if his true 'profit' is $270,000 without any other deductions (so give or take $160K take home), then his combined 2013 federal and CA income tax increase would be $2072 or $172/month.
With normal deductions, this number is going to be lower.
For sure this is not trivial, but he's full of shit.